数据库访问类（Sql）

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;


namespace DataBase
{
    /**//// <summary>
    /// C_HashTable 
    /// </summary>
    public class NoSortHashTable : Hashtable
    {
        private ArrayList keys = new ArrayList();
        public NoSortHashTable()
        {

        }
        public override void Add(object key, object value)
        {
            base.Add(key, value);
            keys.Add(key);
        }
        public override ICollection  Keys
        {
            get
            {
                return keys;
            }
        }
      

        public override void Clear()
        {
            base.Clear();
            keys.Clear();
        }
        public override void Remove(object key)
        {
            base.Remove(key);
            keys.Remove(key);
        }
        public override IDictionaryEnumerator GetEnumerator()
        {
            return base.GetEnumerator();
        }
        public override bool ContainsKey(object key)
        {
            for (int i = 0; i < keys.Count; i++)
            {
                if (((SqlParameter[])key).Rank ==1)
                {
                    if (((SqlParameter[])key)[1].SqlValue.ToString() == ((SqlParameter[])keys[i])[1].SqlValue.ToString())
                    {
                        return true;
                    }
                }
            }
            return false;
        }
        
    }
}

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;

namespace DataBase
{
    /**//// <summary>
    /// 数据访问基础类(基于SQLServer)
    /// </summary>
    public  class SQLHelper
    {
        protected static string connectionString = ConfigurationManager.ConnectionStrings["Connection"].ConnectionString;
        public SQLHelper()
        {

        }

        执行简单SQL语句#region  执行简单SQL语句

        /**//// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public int ExecuteSql(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        /**//// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">多条SQL语句</param>        
        /// <returns>执行成功,返回true,否则返回false;</returns>
        public bool ExecuteSqlTran(ArrayList SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                SqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n].ToString();
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                    return true;
                }
                catch (System.Data.SqlClient.SqlException E)
                {
                    tx.Rollback();
                    conn.Close();
                    conn.Dispose();
                    log4net.ILog log = log4net.LogManager.GetLogger("File");
                    log.Debug(E.Message);
                    return false;
                }
            }
        }
        /**//// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="SQLString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public object GetSingle(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw new Exception(E.Message);
                    }
                }
            }
        }
        /**//// <summary>
        /// 执行查询语句，返回SqlDataReader
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SqlDataReader</returns>
        public SqlDataReader ExecuteReader(string strSQL)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(strSQL, connection);
            try
            {
                connection.Open();
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException E)
            {
                connection.Close();
                connection.Dispose();
                log4net.ILog log = log4net.LogManager.GetLogger("File");
                log.Debug(E.Message);
                throw new Exception(E.Message);
            }

        }
        /**//// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public DataSet GetDataSet(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    SqlDataAdapter adapter = new SqlDataAdapter(SQLString, connection);
                    adapter.Fill(ds, "ds");
                    connection.Close();
                    return ds;
                }
                catch (System.Data.SqlClient.SqlException E)
                {
                    connection.Close();
                    connection.Dispose();
                    log4net.ILog log = log4net.LogManager.GetLogger("File");
                    log.Debug(E.Message);
                    throw new Exception(E.Message);
                }
            }
        }


        #endregion

        执行带参数的SQL语句#region 执行带参数的SQL语句

        /**//// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public int ExecuteSql(string SQLString, DbParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        /**//// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">SQL语句的哈希表（key为SqlParameter[]，value是sql语句）</param>
        public void ExecuteSqlTran(NoSortHashTable SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        //循环
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {
                            string cmdText = myDE.Value.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Key;
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch (SqlException E)
                    {
                        trans.Rollback();
                        conn.Close();
                        conn.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw E;

                    }
                }
            }
        }
        /**//// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">SQL语句的哈希表（key为SqlParameter[]，value是sql语句）</param>
        public void ExecuteSqlTran(Hashtable SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        //循环
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {
                            string cmdText = myDE.Value.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Key;
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch(SqlException E)
                    {
                        trans.Rollback();
                        conn.Close();
                        conn.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw E;

                    }
                }
            }
        }


        /**//// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）,返回首行首列的值;
        /// </summary>
        /// <param name="SQLString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public object GetSingle(string SQLString, DbParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        /**//// <summary>
        /// 执行查询语句，返回SqlDataReader
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SqlDataReader</returns>
        public SqlDataReader ExecuteReader(string SQLString, DbParameter[] cmdParms)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException E)
            {
                connection.Close();
                connection.Dispose();
                log4net.ILog log = log4net.LogManager.GetLogger("File");
                log.Debug(E.Message);
                throw new Exception(E.Message);
            }

        }

        /**//// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public DataSet GetDataSet(string SQLString, DbParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                        return ds;
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw new Exception(E.Message);
                    }
                }
            }
         }


        private void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, DbParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }

        #endregion

        存储过程操作#region 存储过程操作
        /**//// <summary>
        /// 执行存储过程;
        /// </summary>
        /// <param name="storeProcName">存储过程名</param>
        /// <param name="parameters">所需要的参数</param>
        /// <returns>返回受影响的行数</returns>
        public int RunProcedureExecuteSql(string storeProcName, DbParameter[] parameters)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = BuildQueryCommand(connection, storeProcName, parameters);
                int  rows = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                connection.Close();
                return rows;
            }
        }
        /**//// <summary>
        /// 执行存储过程,返回首行首列的值
        /// </summary>
        /// <param name="storeProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>返回首行首列的值</returns>
        public Object RunProcedureGetSingle(string storeProcName, DbParameter[] parameters)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                    try
                    {
                        SqlCommand cmd = BuildQueryCommand(connection, storeProcName, parameters);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw new Exception(E.Message);
                    }
            }
        }
        /**//// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>SqlDataReader</returns>
        public SqlDataReader RunProcedureGetDataReader(string storedProcName, DbParameter[] parameters)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlDataReader returnReader;
            SqlCommand cmd = BuildQueryCommand(connection, storedProcName, parameters);
            cmd.CommandType = CommandType.StoredProcedure;
            returnReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            cmd.Parameters.Clear();
            return returnReader;
        }
        /**//// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>DataSet</returns>
        public DataSet RunProcedureGetDataSet(string storedProcName, DbParameter[] parameters)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                SqlDataAdapter sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.Fill(dataSet);
                connection.Close();
                sqlDA.SelectCommand.Parameters.Clear();
                sqlDA.Dispose();
                return dataSet;
            }
        }
        /**//// <summary>
        /// 执行多个存储过程，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">存储过程的哈希表（value为存储过程语句，key是该语句的DbParameter[]）</param>
        public bool  RunProcedureTran(Hashtable SQLStringList)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();
                using (SqlTransaction trans = connection.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        //循环
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {
                            cmd.Connection = connection;
                            string storeName = myDE.Value.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Key;

                            cmd.Transaction = trans;
                            cmd.CommandText = storeName;
                            cmd.CommandType = CommandType.StoredProcedure;
                            if (cmdParms != null)
                            {
                                foreach (SqlParameter parameter in cmdParms)
                                    cmd.Parameters.Add(parameter);
                            }
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                        return true;
                    }
                    catch(SqlException E)
                    {
                        trans.Rollback();
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw E;
                        return false;
                    }
                }
            }
        }
      
        /**//// <summary>
        /// 执行多个存储过程，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">存储过程的哈希表（value为存储过程语句，key是该语句的DbParameter[]）</param>
        public bool RunProcedureTran(NoSortHashTable SQLStringList)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();
                using (SqlTransaction trans = connection.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        //循环
                        foreach (SqlParameter[] myDE in SQLStringList.Keys)
                        {
                            cmd.Connection = connection;
                            string storeName = SQLStringList[myDE].ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])myDE;

                            cmd.Transaction = trans;
                            cmd.CommandText = storeName;
                            cmd.CommandType = CommandType.StoredProcedure;
                            if (cmdParms != null)
                            {
                                foreach (SqlParameter parameter in cmdParms)
                                    cmd.Parameters.Add(parameter);
                            }
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                        return true;
                    }
                    catch(SqlException E)
                    {
                        trans.Rollback();
                        connection.Close();
                        connection.Dispose();
                        log4net.ILog log = log4net.LogManager.GetLogger("File");
                        log.Debug(E.Message);
                        throw; 
                        return false;
                    }
                }
            }
        }
        /**//// <summary>
        /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
        /// </summary>
        /// <param name="connection">数据库连接</param>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>SqlCommand</returns>
        private SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, DbParameter[] parameters)
        {
            if (connection.State != ConnectionState.Open)
                connection.Open();
            SqlCommand command = new SqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            if (parameters != null)
            {
                foreach (SqlParameter parameter in parameters)
                {
                    command.Parameters.Add(parameter);
                }
            }
            return command;
        }
        #endregion

    }
}