SqlHelper

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

/// <summary>
/// Sql Server 操作基类
/// </summary>
///<author>dsq</author>
///<datetime>09-10-12</datetime>
public class SqlHelper
{
    public SqlHelper()
    {}

    #region 公共方法

    /// <summary>
    /// 验证字符串数组
    /// </summary>
    /// <param name="arr">字符串数组</param>
    /// <returns>验证结果:true or false</returns>
    private static bool ArrayIsNullOrEmpty(string[] arr)
    {
        if (arr == null || arr.Length < 1)
            return true;
        else
        {
            foreach (string parm in arr)
            {
                if (string.IsNullOrEmpty(parm))
                    return true;
            }
            return false;
        }
    }

    /// <summary>
    /// 检查参数
    /// </summary>
    /// <param name="parms">被检测的数组对象</param>
    /// <returns>检测结果:为空:true or false</returns>
    private static bool SqlParameterIsNullOrEmpty(SqlParameter[] parms)
    {
        if (parms == null || parms.Length <= 0)
        {
            return true;
        }
        else
        {
            foreach (SqlParameter parm in parms)
            {
                if (parm == null)
                    return true;
            }
            return false;
        }
    }

    /// <summary>
    /// 检查参数
    /// </summary>
    /// <param name="parms">被检测的数组对象</param>
    /// <returns>检测结果:为空:true or false</returns>
    private static bool SqlParameterIsNullOrEmpty(SqlParameter[][] parms)
    {
        if (parms == null || parms.Length <= 0)
        {
            return true;
        }
        else
        {
            for (int i = 0; i < parms.Length; i++)
            {
                if (parms[i] == null || parms[i].Length < 1)
                    return true;
                foreach (SqlParameter parm in parms[i])
                {
                    if (parm == null)
                        return true;
                }
            }
            return false;
        }
    }

    #endregion

    #region 执行存储过程

    #region 查询数据

    /// <summary>
    /// 带参数的存储过程查询
    /// </summary>
    /// <param name="procName">存储过程名</param>
    /// <param name="parms">参数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据表</returns>
    public static DataTable Proc_ExecuteDataTable(string procName, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(procName) || string.IsNullOrEmpty(conString);
        if (isNull)
            return null;
        DataTable dt = new DataTable();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = conn;
                command.CommandType = CommandType.StoredProcedure;
                command.CommandText = procName;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    using (SqlDataReader dr = command.ExecuteReader())
                    {
                        dt.Load(dr);    
                    }
                    return dt;
                }
                catch
                {
                    return null;
                }
            }
        }
    }

    /// <summary>
    /// 不带参数的存储过程查询
    /// </summary>
    /// <param name="procName">存储过程名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据表</returns>
    public static DataTable Proc_ExecuteDataTable(string procName, string conString)
    {
        if (string.IsNullOrEmpty(procName) || string.IsNullOrEmpty(conString))
            return null;
        DataTable dt = new DataTable();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlDataAdapter adapter = new SqlDataAdapter(procName, conn))
            {
                adapter.SelectCommand.CommandType = CommandType.StoredProcedure;
                try
                {
                    adapter.Fill(dt);
                    return dt;
                }
                catch
                {
                    return null;
                }
            }
        }
    }

    /// <summary>
    /// 带参数的存储过程查询
    /// </summary>
    /// <param name="procName">存储过程名</param>
    /// <param name="parms">参数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据集</returns>
    public static DataSet Proc_ExecuteDataSet(string procName, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(procName) || string.IsNullOrEmpty(conString);
        if (isNull)
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(procName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                using (SqlDataAdapter adapter = new SqlDataAdapter(command))
                {
                    try
                    {
                        adapter.Fill(ds);
                        return ds;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }
    }

    /// <summary>
    /// 带参数的存储过程查询
    /// </summary>
    /// <param name="procName">存储过程名</param>
    /// <param name="parms">参数</param>
    /// <param name="tbName">内存表表名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据集</returns>
    public static DataSet Proc_ExecuteDataSet(string procName, SqlParameter[] parms, string tbName, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(procName) || string.IsNullOrEmpty(tbName) || string.IsNullOrEmpty(conString);
        if (isNull)
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(procName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                using (SqlDataAdapter adapter = new SqlDataAdapter(command))
                {
                    try
                    {
                        adapter.Fill(ds, tbName);
                        return ds;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }
    }

    /// <summary>
    /// 不带参数的存储过程查询
    /// </summary>
    /// <param name="procName">存储过程名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据集</returns>
    public static DataSet Proc_ExecuteDataSet(string procName, string conString)
    {
        if (string.IsNullOrEmpty(procName) || string.IsNullOrEmpty(conString))
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = conn;
                command.CommandType = CommandType.StoredProcedure;
                command.CommandText = procName;
                using (SqlDataAdapter adapter = new SqlDataAdapter())
                {
                    adapter.SelectCommand = command;
                    try
                    {
                        adapter.Fill(ds);
                        return ds;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }
    }

    /// <summary>
    /// 不带参数的存储过程查询
    /// </summary>
    /// <param name="procName">存储过程名</param>
    /// <param name="tbName">内存表表名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据集</returns>
    public static DataSet Proc_ExecuteDataSet(string procName, string tbName, string conString)
    {
        if (string.IsNullOrEmpty(procName) || string.IsNullOrEmpty(tbName) || string.IsNullOrEmpty(conString))
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = conn;
                command.CommandType = CommandType.StoredProcedure;
                command.CommandText = procName;
                using (SqlDataAdapter adapter = new SqlDataAdapter())
                {
                    adapter.SelectCommand = command;
                    try
                    {
                        adapter.Fill(ds, tbName);
                        return ds;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }
    }

    #endregion

    #region 插入数据、更新数据、删除数据

    /// <summary>
    ///  执行插入、删除、更新操作
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQuery(string proName, out int eCount, string conString)
    {
        if (string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString))
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                try
                {
                    conn.Open();
                    eCount = command.ExecuteNonQuery();
                    return true;
                }
                catch
                {
                    eCount = -1;
                    return false;
                }
            }
        }
    }

    /// <summary>
    ///  执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQueryWithTrans(string proName, out int eCount, string conString)
    {
        if (string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString))
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    eCount = command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    eCount = -1;
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="parms">参数数组</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQuery(string proName, SqlParameter[] parms, out int eCount, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString);
        if (isNull)
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    eCount = command.ExecuteNonQuery();
                    return true;
                }
                catch
                {
                    eCount = -1;
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="parms">参数数组</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQueryWithTrans(string proName, SqlParameter[] parms, out int eCount, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString);
        if (isNull)
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    eCount = command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                catch
                {
                    eCount = -1;
                    transaction.Rollback();
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行多次不同插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="proNames">存储过程名数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQueryWithTrans(string[] proNames, string conString)
    {
        bool isError = ArrayIsNullOrEmpty(proNames) || string.IsNullOrEmpty(conString);
        if (isError)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = conn;
                command.CommandType = CommandType.StoredProcedure;
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    foreach (string proName in proNames)
                    {
                        command.CommandText = proName;
                        command.ExecuteNonQuery();
                    }
                    transaction.Commit();
                }
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    return false;
                }
            }
            return true;
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQuery(string proName, string conString)
    {
        if (string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString))
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                try
                {
                    conn.Open();
                    command.ExecuteNonQuery();
                    return true;
                }
                catch
                {
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQueryWithTrans(string proName, string conString)
    {
        if (string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString))
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="parms">参数数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQuery(string proName, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    command.ExecuteNonQuery();
                    return true;
                }
                catch
                {
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="proName">存储过程名</param>
    /// <param name="parms">参数数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQueryWithTrans(string proName, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(proName) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(proName, conn))
            {
                command.CommandType = CommandType.StoredProcedure;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="proNames">存储过程名数组</param>
    /// <param name="parms">参数数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool Proc_ExecuteNonQueryWithTrans(string[] proNames, SqlParameter[][] parms, string conString)
    {
        bool isNull = ArrayIsNullOrEmpty(proNames) || SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            try
            {
                conn.Open();
                transaction = conn.BeginTransaction();
                for (int i = 0; i < proNames.Length; i++)
                {
                    SqlCommand command = new SqlCommand();
                    command.Connection = conn;
                    command.CommandType = CommandType.StoredProcedure;
                    command.CommandText = proNames[i];
                    command.Transaction = transaction;
                    foreach (SqlParameter parm in parms[i])
                        command.Parameters.Add(parm);
                    command.ExecuteNonQuery();
                }
                transaction.Commit();
            }
            catch
            {
                if (transaction != null)
                    transaction.Rollback();
                return false;
            }
            return true;
        }
    }

    #endregion

    #endregion

    #region 执行SQL语句

    #region 查询数据

    /// <summary>
    /// 不带参数的查询
    /// </summary>
    /// <param name="selectSql">查询语句</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据表</returns>
    public static DataTable SQL_ExecuteDataTable(string selectSql, string conString)
    {
        if (string.IsNullOrEmpty(selectSql) || string.IsNullOrEmpty(conString))
            return null;
        DataTable dt = new DataTable();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = conn;
                command.CommandType = CommandType.Text;
                command.CommandText = selectSql;
                try
                {
                    conn.Open();
                    using (SqlDataReader sr = command.ExecuteReader())
                    {
                        dt.Load(sr);
                    }
                    return dt;//返回一个表格
                }
                catch
                {
                    return null;
                }
            }
        }
    }

    /// <summary>
    /// 带参的查询
    /// </summary>
    /// <param name="selectSql">查询语句</param>
    /// <param name="parms">参数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>数据表</returns>
    public static DataTable SQL_ExecuteDataTable(string selectSql, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(selectSql) || string.IsNullOrEmpty(conString);
        if (isNull)
            return null;
        DataTable dt = new DataTable();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(selectSql, conn))
            {
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                using (SqlDataAdapter adpter = new SqlDataAdapter(command))
                {
                    try
                    {
                        adpter.Fill(dt);
                        return dt;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }
    }

    /// <summary>
    /// 不带参数的查询
    /// </summary>
    /// <param name="selectSql">查询语句</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>查询结果</returns>
    public static DataSet SQL_ExecuteDataSet(string selectSql, string conString)
    {
        if (string.IsNullOrEmpty(selectSql) || string.IsNullOrEmpty(conString))
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlDataAdapter adpter = new SqlDataAdapter(selectSql, conn))
            {
                try
                {
                    adpter.Fill(ds);
                    return ds;
                }
                catch
                {
                    return null;
                }
            }
        }
    }

    /// <summary>
    /// 不带参数的查询
    /// </summary>
    /// <param name="selectSql">查询语句</param>
    /// <param name="tbName">内存表表名</param>
    /// <param name="conString">数据库连接字符串</param>
    /// <returns>查询结果</returns>
    public static DataSet SQL_ExecuteDataSet(string selectSql, string tbName, string conString)
    {
        if (string.IsNullOrEmpty(selectSql) || string.IsNullOrEmpty(conString) || string.IsNullOrEmpty(tbName))
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlDataAdapter adpter = new SqlDataAdapter(selectSql, conn))
            {
                try
                {
                    adpter.Fill(ds, tbName);
                    return ds;
                }
                catch
                {
                    return null;
                }
            }
        }
    }

    /// <summary>
    /// 带参查询数据
    /// </summary>
    /// <param name="selectSql">查询语句</param>
    /// <param name="parms">参数数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>查询结果集</returns>
    public static DataSet SQL_ExecuteDataSet(string selectSql, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(selectSql) || string.IsNullOrEmpty(conString);
        if (isNull)
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(selectSql, conn))
            {
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                using (SqlDataAdapter adpter = new SqlDataAdapter(command))
                {
                    try
                    {
                        adpter.Fill(ds);
                        return ds;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }
    }

    /// <summary>
    /// 带参查询数据
    /// </summary>
    /// <param name="selectSql">查询语句</param>
    /// <param name="parms">参数数组</param>
    /// <param name="tbName">内存表表名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>查询结果集</returns>
    public static DataSet SQL_ExecuteDataSet(string selectSql, SqlParameter[] parms, string tbName, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(selectSql) || string.IsNullOrEmpty(tbName) || string.IsNullOrEmpty(conString);
        if (isNull)
            return null;
        DataSet ds = new DataSet();
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(selectSql, conn))
            {
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                using (SqlDataAdapter adpter = new SqlDataAdapter(command))
                {
                    try
                    {
                        adpter.Fill(ds, tbName);
                        return ds;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }
    }

    #endregion

    #region 插入数据、更新数据、删除数据

    /// <summary>
    ///  执行插入、删除、更新操作
    /// </summary>
    /// <param name="opSql">执行操作的SQL语句</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQuery(string opSql, out int eCount, string conString)
    {
        if (string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString))
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                try
                {
                    conn.Open();
                    eCount = command.ExecuteNonQuery();
                    return true;
                }
                catch
                {
                    eCount = -1;
                    return false;
                }
            }
        }
    }

    /// <summary>
    ///  执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="opSql">执行操作的SQL语句</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQueryWithTrans(string opSql, out int eCount, string conString)
    {
        if (string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString))
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    eCount = command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    eCount = -1;
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作
    /// </summary>
    /// <param name="opSql">执行操作的sql语句</param>
    /// <param name="parms">参数数组</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQuery(string opSql, SqlParameter[] parms, out int eCount, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString);
        if (isNull)
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                command.CommandType = CommandType.Text;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    eCount = command.ExecuteNonQuery();
                    return true;
                }
                catch
                {
                    eCount = -1;
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="opSql">执行操作的sql语句</param>
    /// <param name="parms">参数数组</param>
    /// <param name="eCount">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQueryWithTrans(string opSql, SqlParameter[] parms, out int eCount, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString);
        if (isNull)
        {
            eCount = -2;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                command.CommandType = CommandType.Text;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    eCount = command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                catch
                {
                    eCount = -1;
                    transaction.Rollback();
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行多次不同插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="opSqls">执行操作的sql语句数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQueryWithTrans(string[] opSqls, string conString)
    {
        bool isNull = ArrayIsNullOrEmpty(opSqls) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = conn;
                command.CommandType = CommandType.Text;
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    foreach (string opSql in opSqls)
                    {
                        command.CommandText = opSql;
                        command.ExecuteNonQuery();
                    }
                    transaction.Commit();
                }
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    return false;
                }
            }
            return true;
        }
    }

    /// <summary>
    /// 执行多次不同插入、删除、更新操作
    /// </summary>
    /// <param name="opSqls">执行操作的sql语句数组</param>
    /// <param name="effectRowCout">影响的行数</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQueryWithTrans(string[] opSqls, out int effectRowCout, string conString)
    {
        bool isNull = ArrayIsNullOrEmpty(opSqls) || string.IsNullOrEmpty(conString);
        if (isNull)
        {
            effectRowCout = -1;
            return false;
        }
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = conn;
                command.CommandType = CommandType.Text;
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    effectRowCout = 0;
                    foreach (string opsql in opSqls)
                    {
                        command.CommandText = opsql;
                        effectRowCout += command.ExecuteNonQuery();
                    }
                    transaction.Commit();
                }
                catch
                {
                    effectRowCout = -1;
                    if (transaction != null)
                        transaction.Rollback();
                    return false;
                }
            }
            return true;
        }

    }

    /// <summary>
    /// 执行插入、删除、更新操作
    /// </summary>
    /// <param name="opSql">执行操作的sql语句</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQuery(string opSql, string conString)
    {
        if (string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString))
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                try
                {
                    conn.Open();
                    command.ExecuteNonQuery();//可以进行插入
                    return true;
                }
                catch
                {
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="opSql">执行操作的sql语句</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQueryWithTrans(string opSql, string conString)
    {
        if (string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString))
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作
    /// </summary>
    /// <param name="opSql">执行操作的SQL语句</param>
    /// <param name="parms">参数数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQuery(string opSql, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                command.CommandType = CommandType.Text;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    command.ExecuteNonQuery();
                    return true;
                }
                catch
                {
                    return false;
                }
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="opSql">执行操作的SQL语句</param>
    /// <param name="parms">参数数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQueryWithTrans(string opSql, SqlParameter[] parms, string conString)
    {
        bool isNull = SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(opSql) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            using (SqlCommand command = new SqlCommand(opSql, conn))
            {
                command.CommandType = CommandType.Text;
                foreach (SqlParameter parm in parms)
                    command.Parameters.Add(parm);
                try
                {
                    conn.Open();
                    transaction = conn.BeginTransaction();
                    command.Transaction = transaction;
                    command.ExecuteNonQuery();
                    transaction.Commit();
                    return true;
                }
                    
                catch
                {
                    if (transaction != null)
                        transaction.Rollback();
                    return false;
                }
               
            }
        }
    }

    /// <summary>
    /// 执行插入、删除、更新操作(附带事务)
    /// </summary>
    /// <param name="opSqls">sql 语句数组</param>
    /// <param name="parms">参数数组</param>
    /// <param name="conString">连接字符串</param>
    /// <returns>执行结果:true or false</returns>
    public static bool SQL_ExecuteNonQueryWithTrans(string[] opSqls, SqlParameter[][] parms, string conString)
    {
        bool isNull = ArrayIsNullOrEmpty(opSqls) || SqlParameterIsNullOrEmpty(parms) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            SqlTransaction transaction = null;
            try
            {
                conn.Open();
                transaction = conn.BeginTransaction();
                for (int i = 0; i < opSqls.Length; i++)
                {
                    SqlCommand command = new SqlCommand();
                    command.Connection = conn;
                    command.CommandType = CommandType.Text;
                    command.CommandText = opSqls[i];
                    command.Transaction = transaction;
                    foreach (SqlParameter parm in parms[i])
                        command.Parameters.Add(parm);
                    command.ExecuteNonQuery();
                }
                transaction.Commit();
            }
            catch
            {
                if (transaction != null)
                    transaction.Rollback();
                return false;
            }
            return true;
        }
    }

    #endregion

    #endregion

    #region  更新DataGridview 中的 DataSet到数据库中相应的表

    /// <summary>
    /// 更新DataGridview中的DataSet到数据库中相应的表
    /// </summary>
    /// <param name="selectSql">sql select语句</param>
    ///<param name="ds">DataSet结果集</param> 
    /// <param name="tbName">DataGridView 中绑定的表名</param>
    /// <param name="conString">连接字符串</param>
    /// <returns></returns>
    public static bool UpdateDataSetToDB(string selectSql, DataSet ds, string tbName, string conString)
    {
        bool isNull = string.IsNullOrEmpty(selectSql) || ((ds == null || ds.Tables.Count < 1) ? true : false) || string.IsNullOrEmpty(tbName) || string.IsNullOrEmpty(conString);
        if (isNull)
            return false;
        using (SqlConnection conn = new SqlConnection(conString))
        {
            using (SqlDataAdapter adapter = new SqlDataAdapter(selectSql, conn))
            {
                try
                {
                    using (SqlCommandBuilder sqlCB = new SqlCommandBuilder(adapter))
                    {
                        adapter.Update(ds, tbName);
                        ds.AcceptChanges();
                        return true;
                    }
                }
                catch
                {
                    return false;
                }
            }
        }
    }

    #endregion

}

 转载地址：http://blog.csdn.net/luxin10/article/details/7003095

SqlServerHelper类，整理微软提供的helper

微软在petShop中使用了SqlServerHelper类，通过调用静态方法实现对数据库的操作，使用起来非常简单顺手，下面整理了该类的代码，并加以说明：

//------------------------------------------------------------
// All Rights Reserved , Copyright (C) 2010 , lusens 
//------------------------------------------------------------

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

namespace Utility.Data
{
    /// <summary>
    /// SQLServer数据库操作类
    /// 本类主要包括SQLServer数据库的基本操作
    /// 
    /// 修改纪录
    /// 
    ///     2010.10.22 版本：1.1 lusens 新增了用户传入sql语句列表的事务操作
    ///        2010.09.05 版本：1.0 lusens 创建。
    /// 
    /// 版本：1.1
    /// 
    /// <author>
    ///        <name>lusens</name>
    ///        <date>2010.09.05</date>
    ///        <EMail>lusens@foxmail.com</EMail>
    /// </author> 
    /// </summary>
    public abstract class SQLServerHepler
    {
        //public static readonly string ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;

        #region public static string GetConnectionStringByConfig()
        /// <summary>
        /// 读取配置文件的ConnectionString字符串
        /// </summary>
        /// <returns>Connection连接字符串</returns>
        public static string GetConnectionStringByConfig()
        {
            return System.Configuration.ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;
        }
        #endregion

        #region 执行SQL，返回被操作的行数,public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

        /// <summary>
        /// 执行SQL语句，返回被操作的行数
        /// 使用using语句进行conn对象的释放
        /// </summary>
        /// <param name="connectionString">连接字符</param>
        /// <param name="cmdType">Command类型，SQL语句或存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns>返回被操作行数</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }
        #endregion

        #region 执行SQL，返回被操作的行数,public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 执行SQL语句，返回被操作的行数
        /// 这里默认使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
        /// </summary>
        /// <param name="connection">数据库连接对象</param>
        /// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }
        #endregion

        #region 执行SQL语句，返回被操作的行数,public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 执行SQL语句，返回被操作的行数
        /// 这里默认使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
        /// </summary>
        /// <param name="trans">SQL事务</param>
        /// <param name="cmdType">command类型，SQL语句或存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        #endregion

        #region 执行SQL，返回SqlDataReader,public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 执行SQL，返回SqlDataReader
        /// 返回一个连接，所以不能进行conn释放，在外界代码中使用完DataReader后，注意需要释放reader对象
        /// 当返回连接对象报错时，这里进行数据库连接的关闭，保证数据库连接使用完成后保持关闭
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);

            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch (Exception e)
            {
                conn.Close();
                throw e;
            }
        }
        #endregion

        #region 执行SQL，返回SqlDataReader, public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 执行SQL，返回SqlDataReader
        /// 返回一个连接，所以不能进行conn释放，在外界代码中使用完DataReader后，注意需要释放reader对象
        /// 当返回连接对象报错时，这里进行数据库连接的关闭，保证数据库连接使用完成后保持关闭
        /// </summary>
        /// <param name="connection">SqlConnection数据库连接对象</param>
        /// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();

            try
            {
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch (Exception e)
            {
                connection.Close();
                throw e;
            }
        }
        #endregion

        #region 执行SQL，返回DataTable， public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 执行SQL，返回DataTable
        /// 使用using语句进行conn对象的释放
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            DataTable dt = new DataTable();
            SqlCommand cmd = new SqlCommand();

            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                using (SqlDataAdapter sda = new SqlDataAdapter())
                {
                    sda.SelectCommand = cmd;
                    sda.Fill(dt);
                }
            }

            return dt;
        }
        #endregion

        #region 执行SQL，返回DataTable,public static DataTable ExecuteDataTable(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 执行SQL，返回DataTable
        /// 这里默认使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
        /// </summary>
        /// <param name="connection">数据库连接对象</param>
        /// <param name="cmdType">Command命令类型，SQL语句或存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static DataTable ExecuteDataTable(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            DataTable dt = new DataTable();
            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                sda.SelectCommand = cmd;
                sda.Fill(dt);
            }

            return dt;
        }
        #endregion

        #region 返回第一行第一列，public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 返回第一行第一列
        /// 使用using语句进行conn对象的释放
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="cmdType">Command命令类型，SQL语句还是存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                object val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
        }
        #endregion

        #region 返回第一行第一列，public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        /// <summary>
        /// 返回第一行第一列
        /// 使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
        /// </summary>
        /// <param name="connection">SqlConnection数据库连接对象</param>
        /// <param name="cmdType">Command命令类型，SQL语句还是存储过程</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="commandParameters">参数数组</param>
        /// <returns></returns>
        public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            object val = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            return val;
        }
        #endregion

        #region 以事务执行sql语句列表，public static bool ExecuteTransaction(SqlConnection conn, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
        /// <summary>
        /// 以事务执行sql语句列表，返回事务执行是否成功
        /// </summary>
        /// <param name="conn">数据库连接对象</param>
        /// <param name="cmdTextes">sql语句列表</param>
        /// <param name="commandParameterses">sql语句列表对应的参数列表，参数列表必须与sql语句列表匹配</param>
        /// <returns>事务执行是否成功</returns>
        public static bool ExecuteTransaction(SqlConnection conn, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
        {
            bool flag = false;
            if (cmdTextes.Count == commandParameterses.Count)
            {
                SqlTransaction sqlTran = conn.BeginTransaction();
                try
                {
                    for (int i = 0; i < cmdTextes.Count; i++)
                    {
                        ExecuteNonQuery(sqlTran, CommandType.Text, cmdTextes[i], commandParameterses[i]);
                    }
                    sqlTran.Commit();
                    flag = true;
                }
                catch (Exception e)
                {
                    sqlTran.Rollback();
                }
            }
            return flag;
        }
        #endregion

        #region 以事务执行sql语句列表，返回事务执行是否成功，public static bool ExecuteTransaction(string connectionString, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
        /// <summary>
        /// 以事务执行sql语句列表，返回事务执行是否成功
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="cmdTextes">sql语句列表</param>
        /// <param name="commandParameterses">sql语句列表对应的参数列表，参数列表必须与sql语句列表匹配</param>
        /// <returns></returns>
        public static bool ExecuteTransaction(string connectionString, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
        {
            bool flag = false;
            if (cmdTextes.Count == commandParameterses.Count)
            {
                using (SqlConnection conn = new SqlConnection(connectionString))
                {
                    SqlTransaction sqlTran = conn.BeginTransaction();
                    try
                    {
                        for (int i = 0; i < cmdTextes.Count; i++)
                        {
                            ExecuteNonQuery(sqlTran, CommandType.Text, cmdTextes[i], commandParameterses[i]);
                        }
                        sqlTran.Commit();
                        flag = true;
                    }
                    catch (Exception e)
                    {
                        sqlTran.Rollback();
                    }
                }
            }
            return flag;
        }
        #endregion

        #region 构造SQLCommand,private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        /// <summary>
        /// 构造SQLCommand
        /// </summary>
        /// <param name="cmd">Command对象</param>
        /// <param name="conn">SqlConnection数据库连接对象</param>
        /// <param name="trans">SQL事务</param>
        /// <param name="cmdType">Command命令类型</param>
        /// <param name="cmdText">SQL语句或存储过程名称</param>
        /// <param name="cmdParms">参数数组</param>
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
        #endregion
    }
}