万能的SQLHelper帮助类

/// <summary>
    /// 数据库帮助类
    /// </summary>
    public class SQLHelper
    {
        private static string connStr = "server=.;database=***;uid=**;pwd=***";

        //定义对象
        private static SqlConnection conn = null;
        private static SqlCommand cmd = null;
        private static SqlDataAdapter sda = null;
        private static DataSet ds = null;

        /// <summary>
        /// 查询多行多列
        /// </summary>
        public static DataSet Search(string sql, params SqlParameter[] parameters)
        {
            try
            {
                using (conn = new SqlConnection(connStr))
                {
                    conn.Open();
                    cmd = new SqlCommand(sql, conn);
                    foreach (SqlParameter p in parameters)
                    {
                        cmd.Parameters.Add(p);
                    }
                    sda = new SqlDataAdapter(cmd);
                    ds = new DataSet();
                    sda.Fill(ds);

                    return ds;
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                conn.Close();
            }
        }

        /// <summary>
        /// 查询单行单列
        /// </summary>
        public static object ExecuteScalar(string sql, params SqlParameter[] parameters)
        {
            try
            {
                using (conn = new SqlConnection(connStr))
                {
                    conn.Open();
                    cmd = new SqlCommand(sql, conn);
                    foreach (SqlParameter p in parameters)
                    {
                        cmd.Parameters.Add(p);
                    }
                    object obj = cmd.ExecuteScalar();

                    return obj;
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                conn.Close();
            }
        }

        /// <summary>
        /// 查询单行单列(增删改查)
        /// </summary>
        public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters)
        {
            try
            {
                using (conn = new SqlConnection(connStr))
                {
                    conn.Open();
                    cmd = new SqlCommand(sql, conn);
                    foreach (SqlParameter p in parameters)
                    {
                        cmd.Parameters.Add(p);
                    }
                    int row = cmd.ExecuteNonQuery();

                    return row;
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                conn.Close();
            }
        }
    }

 新得到的数据库帮助类，记录下来，以免下次用到

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Collections;
using System.Xml;

namespace DBHelper
{
    /// <summary>  
    /// SqlHelperParameterCache提供缓存存储过程参数,并能够在运行时从存储过程中探索参数.  
    /// </summary>  
    public sealed class SqlHelperParameterCache  
    {  
        #region 私有方法,字段,构造函数  
        // 私有构造函数,妨止类被实例化.  
        private SqlHelperParameterCache() { }  

        // 这个方法要注意  
        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());  
        /// <summary>  
        /// 探索运行时的存储过程,返回SqlParameter参数数组.  
        /// 初始化参数值为 DBNull.Value.  
        /// </summary>  
        /// <param name="connection">一个有效的数据库连接</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="includeReturnValueParameter">是否包含返回值参数</param>  
        /// <returns>返回SqlParameter参数数组</returns>  
        private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            SqlCommand cmd = new SqlCommand(spName, connection);  
            cmd.CommandType = CommandType.StoredProcedure;  
            connection.Open();  
            // 检索cmd指定的存储过程的参数信息,并填充到cmd的Parameters参数集中.  
            SqlCommandBuilder.DeriveParameters(cmd);  
            connection.Close();  
            // 如果不包含返回值参数,将参数集中的每一个参数删除.  
            if (!includeReturnValueParameter)  
            {  
                cmd.Parameters.RemoveAt(0);  
            }  
  
            // 创建参数数组  
            SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];  
            // 将cmd的Parameters参数集复制到discoveredParameters数组.  
            cmd.Parameters.CopyTo(discoveredParameters, 0);  
            // 初始化参数值为 DBNull.Value.  
            foreach (SqlParameter discoveredParameter in discoveredParameters)  
            {  
                discoveredParameter.Value = DBNull.Value;  
            }  
            return discoveredParameters;  
        }  
  
        /// <summary>  
        /// SqlParameter参数数组的深层拷贝.  
        /// </summary>  
        /// <param name="originalParameters">原始参数数组</param>  
        /// <returns>返回一个同样的参数数组</returns>  
        private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)  
        {  
            SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];  
            for (int i = 0, j = originalParameters.Length; i < j; i++)  
            {  
                clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();  
            }  
            return clonedParameters;  
        }  
        #endregion 私有方法,字段,构造函数结束  
 
        #region 缓存方法  
        /// <summary>  
        /// 追加参数数组到缓存.  
        /// </summary>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandText">存储过程名或SQL语句</param>  
        /// <param name="parameters">要缓存的参数数组</param>  
        public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] parameters)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");  
            string hashKey = connectionString + ":" + commandText;  
            paramCache[hashKey] = parameters;  
        }  
  
        /// <summary>  
        /// 从缓存中获取参数数组.  
        /// </summary>  
        /// <param name="connectionString">一个有效的数据库连接字符</param>  
        /// <param name="commandText">存储过程名或SQL语句</param>  
        /// <returns>参数数组</returns>  
        public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");  
            string hashKey = connectionString + ":" + commandText;  
            SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];  
            if (cachedParameters == null)  
            {  
                return null;  
            }  
            else  
            {  
                return CloneParameters(cachedParameters);  
            }  
        }  
        #endregion 缓存方法结束  
 
        #region 检索指定的存储过程的参数集  
        /// <summary>  
        /// 返回指定的存储过程的参数集  
        /// </summary>  
        /// <remarks>  
        /// 这个方法将查询数据库,并将信息存储到缓存.  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符</param>  
        /// <param name="spName">存储过程名</param>  
        /// <returns>返回SqlParameter参数数组</returns>  
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)  
        {  
            return GetSpParameterSet(connectionString, spName, false);  
        }  
  
        /// <summary>  
        /// 返回指定的存储过程的参数集  
        /// </summary>  
        /// <remarks>  
        /// 这个方法将查询数据库,并将信息存储到缓存.  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符.</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="includeReturnValueParameter">是否包含返回值参数</param>  
        /// <returns>返回SqlParameter参数数组</returns>  
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);  
            }  
        }  
  
        /// <summary>  
        /// [内部]返回指定的存储过程的参数集(使用连接对象).  
        /// </summary>  
        /// <remarks>  
        /// 这个方法将查询数据库,并将信息存储到缓存.  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接字符</param>  
        /// <param name="spName">存储过程名</param>  
        /// <returns>返回SqlParameter参数数组</returns>  
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)  
        {  
            return GetSpParameterSet(connection, spName, false);  
        }  
  
        /// <summary>  
        /// [内部]返回指定的存储过程的参数集(使用连接对象)  
        /// </summary>  
        /// <remarks>  
        /// 这个方法将查询数据库,并将信息存储到缓存.  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="includeReturnValueParameter">  
        /// 是否包含返回值参数  
        /// </param>  
        /// <returns>返回SqlParameter参数数组</returns>  
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())  
            {  
                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);  
            }  
        }  
  
        /// <summary>  
        /// [私有]返回指定的存储过程的参数集(使用连接对象)  
        /// </summary>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="includeReturnValueParameter">是否包含返回值参数</param>  
        /// <returns>返回SqlParameter参数数组</returns>  
        private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");  
            SqlParameter[] cachedParameters;  
  
            cachedParameters = paramCache[hashKey] as SqlParameter[];  
            if (cachedParameters == null)  
            {  
                SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);  
                paramCache[hashKey] = spParameters;  
                cachedParameters = spParameters;  
            }  
  
            return CloneParameters(cachedParameters);  
        }  
 
        #endregion 参数集检索结束  
    }


    /// <summary>  
    /// SqlServer数据访问帮助类  
    /// </summary>  
    public sealed class SqlHelper  
    {  
        #region 私有构造函数和方法  
        private SqlHelper() { }  
        /// <summary>  
        /// 将SqlParameter参数数组(参数值)分配给SqlCommand命令.  
        /// 这个方法将给任何一个参数分配DBNull.Value;  
        /// 该操作将阻止默认值的使用.  
        /// </summary>  
        /// <param name="command">命令名</param>  
        /// <param name="parameters">SqlParameters数组</param>  
        private static void AttachParameters(SqlCommand command, SqlParameter[] parameters)  
        {  
            if (command == null) throw new ArgumentNullException("command");  
            if (parameters != null)  
            {  
                foreach (SqlParameter p in parameters)  
                {  
                    if (p != null)  
                    {  
                        // 检查未分配值的输出参数,将其分配以DBNull.Value.  
                        if ((p.Direction == ParameterDirection.InputOutput || p.Direction == ParameterDirection.Input) &&  
                            (p.Value == null))  
                        {  
                            p.Value = DBNull.Value;  
                        }  
                        command.Parameters.Add(p);  
                    }  
                }  
            }  
        }  
  
        /// <summary>  
        /// 将DataRow类型的列值分配到SqlParameter参数数组.  
        /// </summary>  
        /// <param name="parameters">要分配值的SqlParameter参数数组</param>  
        /// <param name="dataRow">将要分配给存储过程参数的DataRow</param>  
        private static void AssignParameterValues(SqlParameter[] parameters, DataRow dataRow)  
        {  
            if ((parameters == null) || (dataRow == null))  
            {  
                return;  
            }  
            int i = 0;  
            // 设置参数值  
            foreach (SqlParameter commandParameter in parameters)  
            {  
                // 创建参数名称,如果不存在,只抛出一个异常.  
                if (commandParameter.ParameterName == null ||  
                    commandParameter.ParameterName.Length <= 1)  
                    throw new Exception(  
                        string.Format("请提供参数{0}一个有效的名称{1}.", i, commandParameter.ParameterName));  
                // 从dataRow的表中获取为参数数组中数组名称的列的索引.  
                // 如果存在和参数名称相同的列,则将列值赋给当前名称的参数.  
                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)  
                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];  
                i++;  
            }  
        }  
  
        /// <summary>  
        /// 将一个对象数组分配给SqlParameter参数数组.  
        /// </summary>  
        /// <param name="parameters">要分配值的SqlParameter参数数组</param>  
        /// <param name="parameterValues">将要分配给存储过程参数的对象数组</param>  
        private static void AssignParameterValues(SqlParameter[] parameters, object[] parameterValues)  
        {  
            if ((parameters == null) || (parameterValues == null))  
            {  
                return;  
            }  
            // 确保对象数组个数与参数个数匹配,如果不匹配,抛出一个异常.  
            if (parameters.Length != parameterValues.Length)  
            {  
                throw new ArgumentException("参数值个数与参数不匹配.");  
            }  
            // 给参数赋值  
            for (int i = 0, j = parameters.Length; i < j; i++)  
            {  
                // If the current array value derives from IDbDataParameter, then assign its Value property  
                if (parameterValues[i] is IDbDataParameter)  
                {  
                    IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];  
                    if (paramInstance.Value == null)  
                    {  
                        parameters[i].Value = DBNull.Value;  
                    }  
                    else  
                    {  
                        parameters[i].Value = paramInstance.Value;  
                    }  
                }  
                else if (parameterValues[i] == null)  
                {  
                    parameters[i].Value = DBNull.Value;  
                }  
                else  
                {  
                    parameters[i].Value = parameterValues[i];  
                }  
            }  
        }  
  
        /// <summary>  
        /// 预处理用户提供的命令,数据库连接/事务/命令类型/参数  
        /// </summary>  
        /// <param name="command">要处理的SqlCommand</param>  
        /// <param name="connection">数据库连接</param>  
        /// <param name="transaction">一个有效的事务或者是null值</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本, 其它.)</param>  
        /// <param name="commandText">存储过程名或都T-SQL命令文本</param>  
        /// <param name="parameters">和命令相关联的SqlParameter参数数组,如果没有参数为'null'</param>  
        /// <param name="mustCloseConnection"><c>true</c> 如果连接是打开的,则为true,其它情况下为false.</param>  
        private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] parameters, out bool mustCloseConnection)  
        {  
            if (command == null) throw new ArgumentNullException("command");  
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");  
            // If the provided connection is not open, we will open it  
            if (connection.State != ConnectionState.Open)  
            {  
                mustCloseConnection = true;  
                connection.Open();  
            }  
            else  
            {  
                mustCloseConnection = false;  
            }  
            // 给命令分配一个数据库连接.  
            command.Connection = connection;  
            // 设置命令文本(存储过程名或SQL语句)  
            command.CommandText = commandText;  
            // 分配事务  
            if (transaction != null)  
            {  
                if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
                command.Transaction = transaction;  
            }  
            // 设置命令类型.  
            command.CommandType = commandType;  
            // 分配命令参数  
            if (parameters != null)  
            {  
                AttachParameters(command, parameters);  
            }  
            return;  
        }  
        #endregion 私有构造函数和方法结束  
 
        #region ExecuteNonQuery命令  
        /// <summary>  
        /// 执行指定连接字符串,类型的SqlCommand.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本, 其它.)</param>  
        /// <param name="commandText">存储过程名称或SQL语句</param>  
        /// <returns>返回命令影响的行数</returns>  
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)  
        {  
            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定连接字符串,类型的SqlCommand.如果没有提供参数,不返回结果.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本, 其它.)</param>  
        /// <param name="commandText">存储过程名称或SQL语句</param>  
        /// <param name="parameters">SqlParameter参数数组</param>  
        /// <returns>返回命令影响的行数</returns>  
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                connection.Open();  
                return ExecuteNonQuery(connection, commandType, commandText, parameters);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接字符串的存储过程,将对象数组的值赋给存储过程参数,  
        /// 此方法需要在参数缓存方法中探索参数并生成参数.  
        /// </summary>  
        /// <remarks>  
        /// 这个方法没有提供访问输出参数和返回值.  
        /// 示例:    
        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串/param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="parameterValues">分配到存储过程输入参数的对象数组</param>  
        /// <returns>返回受影响的行数</returns>  
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果存在参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从探索存储过程参数(加载到缓存)并分配给存储过程参数数组.  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数情况下  
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令   
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <returns>返回影响的行数</returns>  
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)  
        {  
            return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>  
        /// <param name="commandText">T存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">SqlParamter参数数组</param>  
        /// <returns>返回影响的行数</returns>  
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            // 创建SqlCommand命令,并进行预处理  
            SqlCommand cmd = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, parameters, out mustCloseConnection);  
  
            // Finally, execute the command  
            int retval = cmd.ExecuteNonQuery();  
  
            // 清除参数,以便再次使用.  
            cmd.Parameters.Clear();  
            if (mustCloseConnection)  
                connection.Close();  
            return retval;  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,将对象数组的值赋给存储过程参数.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值  
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回影响的行数</returns>  
        public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
                // 给存储过程分配参数值  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行带事务的SqlCommand.  
        /// </summary>  
        /// <remarks>  
        /// 示例.:    
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");  
        /// </remarks>  
        /// <param name="transaction">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <returns>返回影响的行数/returns>  
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)  
        {  
            return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行带事务的SqlCommand(指定参数).  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="transaction">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">SqlParamter参数数组</param>  
        /// <returns>返回影响的行数</returns>  
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            // 预处理  
            SqlCommand cmd = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, parameters, out mustCloseConnection);  
  
            // 执行  
            int retval = cmd.ExecuteNonQuery();  
  
            // 清除参数集,以便再次使用.  
            cmd.Parameters.Clear();  
            return retval;  
        }  
  
        /// <summary>  
        /// 执行带事务的SqlCommand(指定参数值).  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值  
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);  
        /// </remarks>  
        /// <param name="transaction">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回受影响的行数</returns>  
        public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion ExecuteNonQuery方法结束  
 
        #region ExecuteDataset方法  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)  
        {  
            return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 示例:   
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">SqlParamters参数数组</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            // 创建并打开数据库连接对象,操作完成释放对象.  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                connection.Open();  
                // 调用指定数据库连接字符串重载方法.  
                return ExecuteDataset(connection, commandType, commandText, parameters);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,直接提供参数值,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值.  
        /// 示例:   
        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中检索存储过程参数  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
                // 给存储过程参数分配值  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)  
        {  
            return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,指定存储过程参数,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <param name="parameters">SqlParamter参数数组</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            // 预处理  
            SqlCommand cmd = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, parameters, out mustCloseConnection);  
  
            // 创建SqlDataAdapter和DataSet.  
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))  
            {  
                DataSet ds = new DataSet();  
                // 填充DataSet.  
                da.Fill(ds);  
  
                cmd.Parameters.Clear();  
                if (mustCloseConnection)  
                    connection.Close();  
                return ds;  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,指定参数值,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输入参数和返回值.  
        /// 示例.:    
        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 比缓存中加载存储过程参数  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
                // 给存储过程参数分配值  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定事务的命令,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="transaction">事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)  
        {  
            return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定事务的命令,指定参数,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="transaction">事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <param name="parameters">SqlParamter参数数组</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            // 预处理  
            SqlCommand cmd = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, parameters, out mustCloseConnection);  
  
            // 创建 DataAdapter & DataSet  
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))  
            {  
                DataSet ds = new DataSet();  
                da.Fill(ds);  
                cmd.Parameters.Clear();  
                return ds;  
            }  
        }  
  
        /// <summary>  
        /// 执行指定事务的命令,指定参数值,返回DataSet.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输入参数和返回值.  
        /// 示例.:    
        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="transaction">事务</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回一个包含结果集的DataSet</returns>  
        public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
                // 给存储过程参数分配值  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion ExecuteDataset数据集命令结束  
 
        #region ExecuteReader 数据阅读器  
        /// <summary>  
        /// 枚举,标识数据库连接是由SqlHelper提供还是由调用者提供  
        /// </summary>  
        private enum SqlConnectionOwnership  
        {  
            /// <summary>由SqlHelper提供连接</summary>  
            Internal,  
            /// <summary>由调用者提供连接</summary>  
            External  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的数据阅读器.  
        /// </summary>  
        /// <remarks>  
        /// 如果是SqlHelper打开连接,当连接关闭DataReader也将关闭.  
        /// 如果是调用都打开连接,DataReader由调用都管理.  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="transaction">一个有效的事务,或者为 'null'</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <param name="parameters">SqlParameters参数数组,如果没有参数则为'null'</param>  
        /// <param name="connectionOwnership">标识数据库连接对象是由调用者提供还是由SqlHelper提供</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] parameters, SqlConnectionOwnership connectionOwnership)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            bool mustCloseConnection = false;  
            // 创建命令  
            SqlCommand cmd = new SqlCommand();  
            try  
            {  
                PrepareCommand(cmd, connection, transaction, commandType, commandText, parameters, out mustCloseConnection);  
  
                // 创建数据阅读器  
                SqlDataReader dataReader;  
                if (connectionOwnership == SqlConnectionOwnership.External)  
                {  
                    dataReader = cmd.ExecuteReader();  
                }  
                else  
                {  
                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  
                }  
  
                // 清除参数,以便再次使用..  
                // HACK: There is a problem here, the output parameter values are fletched   
                // when the reader is closed, so if the parameters are detached from the command  
                // then the SqlReader can磘 set its values.   
                // When this happen, the parameters can磘 be used again in other command.  
                bool canClear = true;  
                foreach (SqlParameter commandParameter in cmd.Parameters)  
                {  
                    if (commandParameter.Direction != ParameterDirection.Input)  
                        canClear = false;  
                }  
  
                if (canClear)  
                {  
                    cmd.Parameters.Clear();  
                }  
                return dataReader;  
            }  
            catch  
            {  
                if (mustCloseConnection)  
                    connection.Close();  
                throw;  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的数据阅读器.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)  
        {  
            return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的数据阅读器,指定参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <param name="parameters">SqlParamter参数数组(new SqlParameter("@prodid", 24))</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            SqlConnection connection = null;  
            try  
            {  
                connection = new SqlConnection(connectionString);  
                connection.Open();  
                return ExecuteReader(connection, null, commandType, commandText, parameters, SqlConnectionOwnership.Internal);  
            }  
            catch  
            {  
                // If we fail to return the SqlDatReader, we need to close the connection ourselves  
                if (connection != null) connection.Close();  
                throw;  
            }  
  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的数据阅读器,指定参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的数据阅读器.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名或T-SQL语句</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)  
        {  
            return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="parameters">SqlParamter参数数组</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, parameters, SqlConnectionOwnership.External);  
        }  
  
        /// <summary>  
        /// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">T存储过程名</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteReader(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return ExecuteReader(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)  
        {  
            return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// [调用者方式]执行指定数据库事务的数据阅读器,指定参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, parameters, SqlConnectionOwnership.External);  
        }  
  
        /// <summary>  
        /// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
                AssignParameterValues(parameters, parameterValues);  
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion ExecuteReader数据阅读器  
 
        #region ExecuteScalar 返回结果集中的第一行第一列  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)  
        {  
            // 执行参数为空的方法  
            return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,指定参数,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            // 创建并打开数据库连接对象,操作完成释放对象.  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                connection.Open();  
                // 调用指定数据库连接字符串重载方法.  
                return ExecuteScalar(connection, commandType, commandText, parameters);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,指定参数值,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)  
        {  
            // 执行参数为空的方法  
            return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,指定参数,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            // 创建SqlCommand命令,并进行预处理  
            SqlCommand cmd = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, parameters, out mustCloseConnection);  
  
            // 执行SqlCommand命令,并返回结果.  
            object retval = cmd.ExecuteScalar();  
  
            // 清除参数,以便再次使用.  
            cmd.Parameters.Clear();  
            if (mustCloseConnection)  
                connection.Close();  
            return retval;  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,指定参数值,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的命令,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)  
        {  
            // 执行参数为空的方法  
            return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的命令,指定参数,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            // 创建SqlCommand命令,并进行预处理  
            SqlCommand cmd = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, parameters, out mustCloseConnection);  
  
            // 执行SqlCommand命令,并返回结果.  
            object retval = cmd.ExecuteScalar();  
  
            // 清除参数,以便再次使用.  
            cmd.Parameters.Clear();  
            return retval;  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的命令,指定参数值,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // PPull the parameters for this stored procedure from the parameter cache ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion ExecuteScalar  
 
        #region ExecuteXmlReader XML阅读器  
        /// <summary>  
        /// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>  
        /// <returns>返回XmlReader结果集对象.</returns>  
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)  
        {  
            // 执行参数为空的方法  
            return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        /// <returns>返回XmlReader结果集对象.</returns>  
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            bool mustCloseConnection = false;  
            // 创建SqlCommand命令,并进行预处理  
            SqlCommand cmd = new SqlCommand();  
            try  
            {  
                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, parameters, out mustCloseConnection);  
  
                // 执行命令  
                XmlReader retval = cmd.ExecuteXmlReader();  
  
                // 清除参数,以便再次使用.  
                cmd.Parameters.Clear();  
                return retval;  
            }  
            catch  
            {  
                if (mustCloseConnection)  
                    connection.Close();  
                throw;  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称 using "FOR XML AUTO"</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回XmlReader结果集对象.</returns>  
        public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>  
        /// <returns>返回XmlReader结果集对象.</returns>  
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)  
        {  
            // 执行参数为空的方法  
            return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        /// <returns>返回XmlReader结果集对象.</returns>  
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] parameters)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            // 创建SqlCommand命令,并进行预处理  
            SqlCommand cmd = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, parameters, out mustCloseConnection);  
  
            // 执行命令  
            XmlReader retval = cmd.ExecuteXmlReader();  
  
            // 清除参数,以便再次使用.  
            cmd.Parameters.Clear();  
            return retval;  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        /// <returns>返回一个包含结果集的DataSet.</returns>  
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion ExecuteXmlReader 阅读器结束  
 
        #region FillDataset 填充数据集  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)</param>  
        public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (dataSet == null) throw new ArgumentNullException("dataSet");  
  
            // 创建并打开数据库连接对象,操作完成释放对象.  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                connection.Open();  
                // 调用指定数据库连接字符串重载方法.  
                FillDataset(connection, commandType, commandText, dataSet, tableNames);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.指定命令参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>  
        public static void FillDataset(string connectionString, CommandType commandType,  
            string commandText, DataSet dataSet, string[] tableNames,  
            params SqlParameter[] parameters)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (dataSet == null) throw new ArgumentNullException("dataSet");  
            // 创建并打开数据库连接对象,操作完成释放对象.  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                connection.Open();  
                // 调用指定数据库连接字符串重载方法.  
                FillDataset(connection, commandType, commandText, dataSet, tableNames, parameters);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接字符串的命令,映射数据表并填充数据集,指定存储过程参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);  
        /// </remarks>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>      
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        public static void FillDataset(string connectionString, string spName,  
            DataSet dataSet, string[] tableNames,  
            params object[] parameterValues)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (dataSet == null) throw new ArgumentNullException("dataSet");  
            // 创建并打开数据库连接对象,操作完成释放对象.  
            using (SqlConnection connection = new SqlConnection(connectionString))  
            {  
                connection.Open();  
                // 调用指定数据库连接字符串重载方法.  
                FillDataset(connection, spName, dataSet, tableNames, parameterValues);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,映射数据表并填充数据集.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>      
        public static void FillDataset(SqlConnection connection, CommandType commandType,  
            string commandText, DataSet dataSet, string[] tableNames)  
        {  
            FillDataset(connection, commandType, commandText, dataSet, tableNames, null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        public static void FillDataset(SqlConnection connection, CommandType commandType,  
            string commandText, DataSet dataSet, string[] tableNames,  
            params SqlParameter[] parameters)  
        {  
            FillDataset(connection, null, commandType, commandText, dataSet, tableNames, parameters);  
        }  
  
        /// <summary>  
        /// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定存储过程参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        public static void FillDataset(SqlConnection connection, string spName,  
            DataSet dataSet, string[] tableNames,  
            params object[] parameterValues)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (dataSet == null) throw new ArgumentNullException("dataSet");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的命令,映射数据表并填充数据集.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>  
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,  
            string commandText,  
            DataSet dataSet, string[] tableNames)  
        {  
            FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的命令,映射数据表并填充数据集,指定参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,  
            string commandText, DataSet dataSet, string[] tableNames,  
            params SqlParameter[] parameters)  
        {  
            FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, parameters);  
        }  
  
        /// <summary>  
        /// 执行指定数据库事务的命令,映射数据表并填充数据集,指定存储过程参数值.  
        /// </summary>  
        /// <remarks>  
        /// 此方法不提供访问存储过程输出参数和返回值参数.  
        ///   
        /// 示例:    
        ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);  
        /// </remarks>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>  
        /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>  
        public static void FillDataset(SqlTransaction transaction, string spName,  
            DataSet dataSet, string[] tableNames,  
            params object[] parameterValues)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (dataSet == null) throw new ArgumentNullException("dataSet");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果有参数值  
            if ((parameterValues != null) && (parameterValues.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
                // 给存储过程参数赋值  
                AssignParameterValues(parameters, parameterValues);  
                // 调用重载方法  
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, parameters);  
            }  
            else  
            {  
                // 没有参数值  
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);  
            }  
        }  
  
        /// <summary>  
        /// [私有方法][内部调用]执行指定数据库连接对象/事务的命令,映射数据表并填充数据集,DataSet/TableNames/SqlParameters.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="transaction">一个有效的连接事务</param>  
        /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>  
        /// <param name="commandText">存储过程名称或T-SQL语句</param>  
        /// <param name="dataSet">要填充结果集的DataSet实例</param>  
        /// <param name="tableNames">表映射的数据表数组  
        /// 用户定义的表名 (可有是实际的表名.)  
        /// </param>  
        /// <param name="parameters">分配给命令的SqlParamter参数数组</param>  
        private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,  
            string commandText, DataSet dataSet, string[] tableNames,  
            params SqlParameter[] parameters)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (dataSet == null) throw new ArgumentNullException("dataSet");  
            // 创建SqlCommand命令,并进行预处理  
            SqlCommand command = new SqlCommand();  
            bool mustCloseConnection = false;  
            PrepareCommand(command, connection, transaction, commandType, commandText, parameters, out mustCloseConnection);  
  
            // 执行命令  
            using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))  
            {  
  
                // 追加表映射  
                if (tableNames != null && tableNames.Length > 0)  
                {  
                    string tableName = "Table";  
                    for (int index = 0; index < tableNames.Length; index++)  
                    {  
                        if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");  
                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);  
                        tableName += (index + 1).ToString();  
                    }  
                }  
  
                // 填充数据集使用默认表名称  
                dataAdapter.Fill(dataSet);  
                // 清除参数,以便再次使用.  
                command.Parameters.Clear();  
            }  
            if (mustCloseConnection)  
                connection.Close();  
        }  
        #endregion  
 
        #region UpdateDataset 更新数据集  
        /// <summary>  
        /// 执行数据集更新到数据库,指定inserted, updated, or deleted命令.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");  
        /// </remarks>  
        /// <param name="insertCommand">[追加记录]一个有效的T-SQL语句或存储过程</param>  
        /// <param name="deleteCommand">[删除记录]一个有效的T-SQL语句或存储过程</param>  
        /// <param name="updateCommand">[更新记录]一个有效的T-SQL语句或存储过程</param>  
        /// <param name="dataSet">要更新到数据库的DataSet</param>  
        /// <param name="tableName">要更新到数据库的DataTable</param>  
        public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)  
        {  
            if (insertCommand == null) throw new ArgumentNullException("insertCommand");  
            if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");  
            if (updateCommand == null) throw new ArgumentNullException("updateCommand");  
            if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");  
            // 创建SqlDataAdapter,当操作完成后释放.  
            using (SqlDataAdapter dataAdapter = new SqlDataAdapter())  
            {  
                // 设置数据适配器命令  
                dataAdapter.UpdateCommand = updateCommand;  
                dataAdapter.InsertCommand = insertCommand;  
                dataAdapter.DeleteCommand = deleteCommand;  
                // 更新数据集改变到数据库  
                dataAdapter.Update(dataSet, tableName);  
                // 提交所有改变到数据集.  
                dataSet.AcceptChanges();  
            }  
        }  
        #endregion  
 
        #region CreateCommand 创建一条SqlCommand命令  
        /// <summary>  
        /// 创建SqlCommand命令,指定数据库连接对象,存储过程名和参数.  
        /// </summary>  
        /// <remarks>  
        /// 示例:    
        ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");  
        /// </remarks>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="sourceColumns">源表的列名称数组</param>  
        /// <returns>返回SqlCommand命令</returns>  
        public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 创建命令  
            SqlCommand cmd = new SqlCommand(spName, connection);  
            cmd.CommandType = CommandType.StoredProcedure;  
            // 如果有参数值  
            if ((sourceColumns != null) && (sourceColumns.Length > 0))  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
                // 将源表的列到映射到DataSet命令中.  
                for (int index = 0; index < sourceColumns.Length; index++)  
                    parameters[index].SourceColumn = sourceColumns[index];  
                // Attach the discovered parameters to the SqlCommand object  
                AttachParameters(cmd, parameters);  
            }  
            return cmd;  
        }  
        #endregion  
 
        #region ExecuteNonQueryTypedParams 类型化参数(DataRow)  
        /// <summary>  
        /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回受影响的行数.  
        /// </summary>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回影响的行数</returns>  
        public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回受影响的行数.  
        /// </summary>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回影响的行数</returns>  
        public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回受影响的行数.  
        /// </summary>  
        /// <param name="transaction">一个有效的连接事务 object</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回影响的行数</returns>  
        public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // Sf the row has values, the store procedure parameters must be initialized  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion  
 
        #region ExecuteDatasetTypedParams 类型化参数(DataRow)  
        /// <summary>  
        /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataSet.  
        /// </summary>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回一个包含结果集的DataSet.</returns>  
        public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            //如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataSet.  
        /// </summary>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回一个包含结果集的DataSet.</returns>  
        ///   
        public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回DataSet.  
        /// </summary>  
        /// <param name="transaction">一个有效的连接事务 object</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回一个包含结果集的DataSet.</returns>  
        public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion  
 
        #region ExecuteReaderTypedParams 类型化参数(DataRow)  
        /// <summary>  
        /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataReader.  
        /// </summary>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataReader.  
        /// </summary>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回DataReader.  
        /// </summary>  
        /// <param name="transaction">一个有效的连接事务 object</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回包含结果集的SqlDataReader</returns>  
        public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion  
 
        #region ExecuteScalarTypedParams 类型化参数(DataRow)  
        /// <summary>  
        /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <param name="connectionString">一个有效的数据库连接字符串</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)  
        {  
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.  
        /// </summary>  
        /// <param name="transaction">一个有效的连接事务 object</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回结果集中的第一行第一列</returns>  
        public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion  
 
        #region ExecuteXmlReaderTypedParams 类型化参数(DataRow)  
        /// <summary>  
        /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.  
        /// </summary>  
        /// <param name="connection">一个有效的数据库连接对象</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回XmlReader结果集对象.</returns>  
        public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)  
        {  
            if (connection == null) throw new ArgumentNullException("connection");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);  
            }  
        }  
  
        /// <summary>  
        /// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.  
        /// </summary>  
        /// <param name="transaction">一个有效的连接事务 object</param>  
        /// <param name="spName">存储过程名称</param>  
        /// <param name="dataRow">使用DataRow作为参数值</param>  
        /// <returns>返回XmlReader结果集对象.</returns>  
        public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)  
        {  
            if (transaction == null) throw new ArgumentNullException("transaction");  
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");  
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");  
            // 如果row有值,存储过程必须初始化.  
            if (dataRow != null && dataRow.ItemArray.Length > 0)  
            {  
                // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()  
                SqlParameter[] parameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);  
  
                // 分配参数值  
                AssignParameterValues(parameters, dataRow);  
  
                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, parameters);  
            }  
            else  
            {  
                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);  
            }  
        }  
        #endregion  
    }  
  
}