DBHelper

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

namespace BeiJing.ISS.Common
{
    public abstract class DBHelperSQL
    {
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.        
        private static string connectionStringName = ConfigurationManager.AppSettings["ConnectionStringName"];
        public static string connectionString = ConfigurationManager.ConnectionStrings[connectionStringName].ConnectionString;
        public DBHelperSQL()
        {
        }

        #region 公用方法
        /// <summary>
        /// 判断是否存在某表的某个字段
        /// </summary>
        /// <param name="tableName">表名称</param>
        /// <param name="columnName">列名称</param>
        /// <returns>是否存在</returns>
        public static bool ColumnExists(string tableName, string columnName)
        {
            string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
            object res = GetSingle(sql);
            if (res == null)
            {
                return false;
            }
            return Convert.ToInt32(res) > 0;
        }
        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = DBHelperSQL.GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }
        public static bool Exists(string strSql)
        {
            object obj = DBHelperSQL.GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        /// <summary>
        /// 表是否存在
        /// </summary>
        /// <param name="TableName"></param>
        /// <returns></returns>
        public static bool TabExists(string TableName)
        {
            string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
            //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
            object obj = DBHelperSQL.GetSingle(strsql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        public static bool Exists(string strSql, params SqlParameter[] cmdParms)
        {
            object obj = DBHelperSQL.GetSingle(strSql, cmdParms);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        #endregion

        #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 static 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();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 执行SQL语句，返回自增ID //by 卢建华 on 2014/1/6
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSqlReturnId(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandText += ";\nSELECT SCOPE_IDENTITY() AS NewID;";
                        int id = Convert.ToInt32(cmd.ExecuteScalar());
                        return id;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        public static int ExecuteSqlByTime(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 执行Sql和Oracle滴混合事务
        /// </summary>
        /// <param name="list">SQL命令行列表</param>
        /// <param name="oracleCmdSqlList">Oracle命令行列表</param>
        /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>
        public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                SqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    foreach (CommandInfo myDE in list)
                    {
                        string cmdText = myDE.CommandText;
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                        PrepareCommand(cmd, conn, tx, cmdText, cmdParms);
                        if (myDE.EffentNextType == EffentNextType.SolicitationEvent)
                        {
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                            {
                                tx.Rollback();
                                throw new Exception("违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                                //return 0;
                            }

                            object obj = cmd.ExecuteScalar();
                            bool isHave = false;
                            if (obj == null && obj == DBNull.Value)
                            {
                                isHave = false;
                            }
                            isHave = Convert.ToInt32(obj) > 0;
                            if (isHave)
                            {
                                //引发事件
                                myDE.OnSolicitationEvent();
                            }
                        }
                        if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                        {
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                            {
                                tx.Rollback();
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                                //return 0;
                            }

                            object obj = cmd.ExecuteScalar();
                            bool isHave = false;
                            if (obj == null && obj == DBNull.Value)
                            {
                                isHave = false;
                            }
                            isHave = Convert.ToInt32(obj) > 0;

                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                            {
                                tx.Rollback();
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");
                                //return 0;
                            }
                            if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                            {
                                tx.Rollback();
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");
                                //return 0;
                            }
                            continue;
                        }
                        int val = cmd.ExecuteNonQuery();
                        if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                        {
                            tx.Rollback();
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");
                            //return 0;
                        }
                        cmd.Parameters.Clear();
                    }
                    //string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");
                    //bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);
                    //if (!res)
                    //{
                    //    tx.Rollback();
                    //    throw new Exception("Oracle执行失败");
                    // return -1;
                    //}
                    tx.Commit();
                    return 1;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    tx.Rollback();
                    throw e;
                }
                catch (Exception e)
                {
                    tx.Rollback();
                    throw e;
                }
            }
        }
        /// <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>        
        public static int ExecuteSqlTran(List<String> SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                SqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    int count = 0;
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n];
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            count += cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                    return count;
                }
                catch
                {
                    tx.Rollback();
                    return 0;
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的SQL语句。
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, string content)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(SQLString, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的SQL语句。
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static object ExecuteSqlGet(string SQLString, string content)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(SQLString, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                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)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary>
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
        /// </summary>
        /// <param name="strSQL">SQL语句</param>
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(strSQL, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
                myParameter.Value = fs;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }

        /// <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 static 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();
                        throw e;
                    }
                }
            }
        }
        public static object GetSingle(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        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();
                        throw e;
                    }
                }
            }
        }
        /// <summary>
        /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SqlDataReader</returns>
        public static 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)
            {
                throw e;
            }

        }
        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString)
        {

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }

        }
        public static DataSet Query(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                    command.SelectCommand.CommandTimeout = Times;
                    command.Fill(ds, "ds");
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }



        #endregion

        #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 static int ExecuteSql(string SQLString, params SqlParameter[] 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)
                    {
                        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sql语句，value是该语句的SqlParameter[]）</param>
        public static 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.Key.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }
        /// <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sql语句，value是该语句的SqlParameter[]）</param>
        public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        int count = 0;
                        //循环
                        foreach (CommandInfo myDE in cmdList)
                        {
                            string cmdText = myDE.CommandText;
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);

                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                            {
                                if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                                {
                                    trans.Rollback();
                                    return 0;
                                }

                                object obj = cmd.ExecuteScalar();
                                bool isHave = false;
                                if (obj == null && obj == DBNull.Value)
                                {
                                    isHave = false;
                                }
                                isHave = Convert.ToInt32(obj) > 0;

                                if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                                {
                                    trans.Rollback();
                                    return 0;
                                }
                                if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                                {
                                    trans.Rollback();
                                    return 0;
                                }
                                continue;
                            }
                            int val = cmd.ExecuteNonQuery();
                            count += val;
                            if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                            {
                                trans.Rollback();
                                return 0;
                            }
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                        return count;
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }
        /// <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sql语句，value是该语句的SqlParameter[]）</param>
        public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        int indentity = 0;
                        //循环
                        foreach (CommandInfo myDE in SQLStringList)
                        {
                            string cmdText = myDE.CommandText;
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.InputOutput)
                                {
                                    q.Value = indentity;
                                }
                            }
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.Output)
                                {
                                    indentity = Convert.ToInt32(q.Value);
                                }
                            }
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }
        /// <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sql语句，value是该语句的SqlParameter[]）</param>
        public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        int indentity = 0;
                        //循环
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {
                            string cmdText = myDE.Key.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.InputOutput)
                                {
                                    q.Value = indentity;
                                }
                            }
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.Output)
                                {
                                    indentity = Convert.ToInt32(q.Value);
                                }
                            }
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }
        /// <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 static object GetSingle(string SQLString, params SqlParameter[] 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)
                    {
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SqlDataReader</returns>
        public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] 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)
            {
                throw e;
            }
            //            finally
            //            {
            //                cmd.Dispose();
            //                connection.Close();
            //            }    

        }

        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString, params SqlParameter[] 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();
                    }
                    catch (System.Data.SqlClient.SqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds;
                }
            }

        }


        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, 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 = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {


                foreach (SqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }

        #endregion

        #region 存储过程操作

        /// <summary>
        /// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>SqlDataReader</returns>
        public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlDataReader returnReader;
            connection.Open();
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
            return returnReader; 
        }

        /// <summary>
        /// 执行带输出参数的存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="outParamName">输出参数名 不带‘@’</param>
        /// <returns></returns>
        public static string RunProcedure2(string storedProcName, IDataParameter[] parameters,string outParamName)
        {
            outParamName = "@" + outParamName;
            using(SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();
                SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
                command.Parameters.Add(outParamName, SqlDbType.VarChar, 50);//输出参数
                command.Parameters[outParamName].Direction = ParameterDirection.Output;
                command.CommandType = CommandType.StoredProcedure;
                command.ExecuteNonQuery();
                string strOutValue = command.Parameters[outParamName].Value.ToString();
                return strOutValue;
            }

        }

        /// <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>
        /// <param name="tableName">DataSet结果中的表名</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
        {
            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, tableName);
                connection.Close();
                return dataSet;
            }
        }

        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                SqlDataAdapter sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.SelectCommand.CommandTimeout = Times;
                sqlDA.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }


        /// <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 static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = new SqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            if (parameters != null && parameters.Length > 0)
            {
                foreach (SqlParameter parameter in parameters)
                {
                    if (parameter != null)
                    {
                        // 检查未分配值的输出参数,将其分配以DBNull.Value.
                        if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                            (parameter.Value == null))
                        {
                            parameter.Value = DBNull.Value;
                        }
                        command.Parameters.Add(parameter);
                    }
                }
            }
            return command;
        }

        /// <summary>
        /// 执行存储过程，返回影响的行数        
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="rowsAffected">影响的行数</param>
        /// <returns></returns>
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                int result;
                connection.Open();
                SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
                rowsAffected = command.ExecuteNonQuery();
                result = (int)command.Parameters["ReturnValue"].Value;
                //Connection.Close();
                return result;
            }
        }

        /// <summary>
        /// 创建 SqlCommand 对象实例(用来返回一个整数值)    
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>SqlCommand 对象实例</returns>
        private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.Parameters.Add(new SqlParameter("ReturnValue",
                SqlDbType.Int, 4, ParameterDirection.ReturnValue,
                false, 0, 0, string.Empty, DataRowVersion.Default, null));
            return command;
        }
        #endregion

        /// <summary>
        /// 执行一条返回DataSet的SqlCommand命令
        /// </summary>
        /// <remarks>
        /// 使用示例：
        /// (1) SQL语句： DataSet ds = ExecuteDataSet(connString, CommandType.Text, "SELECT * FROM [PublishOrders] WHERE [prodid]=@prodid", new SqlParameter("@prodid", 24));
        /// (2) 存储过程： DataSet ds = ExecuteDataSet(connString, CommandType.StoredProcedure, "GetPublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connString">数据库连接字符串</param>
        /// <param name="cmdType">命令类型 (SQL语句或存储过程，等等)</param>
        /// <param name="cmdText">SQL语句或存储过程</param>
        /// <param name="cmdParams">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个DataSet类型的结果集</returns>
        public static DataSet ExecuteDataSet(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)
        {
            SqlCommand cmd = new SqlCommand();
            using (SqlConnection conn = new SqlConnection(connString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParams);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet();
                da.Fill(ds);
                return ds;
            }
        }
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParams)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();

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

            //判断是否需要事务处理
            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

            if (cmdParams != null)
            {
                foreach (SqlParameter parm in cmdParams)
                {
                    if (parm.Value == null)
                    {
                        parm.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parm);
                }
            }
        }
        public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)
        {
            return ExecuteDataSet(connectionString, cmdType, cmdText, cmdParams);
        }

        public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText)
        {
            return ExecuteDataSet(cmdType, cmdText, null);
        }

        public static DataSet ExecuteDataSet(string sqlstr, params SqlParameter[] cmdParams)
        {
            return ExecuteDataSet(CommandType.Text, sqlstr, cmdParams);
        }

        public static DataSet ExecuteDataSet(string sqlstr)
        {
            return ExecuteDataSet(CommandType.Text, sqlstr);
        }


        #region 扩展方法

        /// <summary>
        /// 获取sql比较运算符
        /// </summary>
        /// <param name="c">sql运算符枚举</param>
        /// <returns></returns>
        public static string GetSqlComparison(EnumSqlComparison c)
        {
            string strSqlComparison = "";
            switch (c)
            {
                case EnumSqlComparison.Equal: strSqlComparison = "="; break;
                case EnumSqlComparison.Greater: strSqlComparison = ">"; break;
                case EnumSqlComparison.Less: strSqlComparison = "<"; break;
                case EnumSqlComparison.GreaterEqual: strSqlComparison = ">="; break;
                case EnumSqlComparison.LessEqual: strSqlComparison = "<="; break;
                case EnumSqlComparison.NotEqual: strSqlComparison = "<>"; break;
                case EnumSqlComparison.Like: strSqlComparison = "like"; break;
                case EnumSqlComparison.In: strSqlComparison = "in"; break;
                default: strSqlComparison = "="; break;
            }
            
            return strSqlComparison;
        }

        /// <summary>
        /// 获取sql比较运算符
        /// </summary>
        /// <param name="c">sql运算符枚举</param>
        /// <param name="strParamValue">参数值</param>
        /// <param name="strDataType">数据类型 默认是int32</param>
        /// <returns></returns>
        public static string GetSqlComparison(EnumSqlComparison c, string strParamValue, DbType strDataType = DbType.Int32)
        {
            string strSqlComparison = GetSqlComparison(c);
            if (strSqlComparison == "like")
            {
                strSqlComparison = strSqlComparison + " '%" + strParamValue + "%'";
            }
            else if (strSqlComparison == "in")
            {
                if (strDataType == System.Data.DbType.String)//字符串类型
                {
                    string[] array = strParamValue.Split(',');
                    string temp = "";
                    for (int i = 0; i < array.Length; i++)
                    {
                        temp += "'" + array[i] + "',";
                    }
                    temp = temp.TrimEnd(',');
                    strSqlComparison = strSqlComparison + " (" + temp + ")";
                }
                else//int等数值类型
                {
                    strSqlComparison = strSqlComparison + " (" + strParamValue + ")";
                }
            }
            else
            {
                if (strDataType == System.Data.DbType.String)//字符串类型
                {
                    strSqlComparison = strSqlComparison + "'" + strParamValue + "'";
                }
                else//int等数值类型
                {
                    strSqlComparison = strSqlComparison + strParamValue;
                }
            }
            return strSqlComparison;
        }

        /// <summary>
        /// 获取sql条件对象
        /// </summary>
        /// <param name="strColumnName">列名</param>
        /// <param name="c">sql运算符枚举</param>
        /// <param name="strParamValue">参数值</param>
        /// <param name="strDataType">数据类型 默认是int32</param>
        /// <returns></returns>
        public static SqlCondition GetSqlComparison(string strColumnName, EnumSqlComparison c, string strParamValue, DbType strDataType = DbType.Int32)
        {
            return new SqlCondition() {
                ColumnName=strColumnName,
                SqlComparison = GetSqlComparison(c, strParamValue, strDataType)
            };
        }

        /// <summary>
        /// 获取查询条件
        /// </summary>
        public static string GetWhere(List<SqlCondition> filterExpression, string sqlWhere = "") 
        {
            string strWhere = "";
            if (filterExpression != null && filterExpression.Count > 0)
            {
                foreach (SqlCondition c in filterExpression)
                {
                    strWhere += " and " + c.ColumnName + " " + c.SqlComparison;
                }
            }
            if (!string.IsNullOrEmpty(sqlWhere))//其他sql条件
            {
                strWhere += " and " + sqlWhere;
            }
            return strWhere;
        }

        /// <summary>
        /// 获取排序的字段
        /// </summary>
        /// <param name="sortExpressions">Grid排序条件，不用加ASC,DESC</param>
        /// <param name="primaryId">主键Id 如果主键名称是Id可以省略</param>
        /// <returns></returns>
        public static string GetOrderby(string sortExpressions,string primaryId="Id")
        {
            string strOrderby = " order by Id desc";
            if (!string.IsNullOrEmpty(primaryId) && primaryId != "Id")
            {
                strOrderby = " order by " + primaryId + " desc";
            }
            else if (!string.IsNullOrEmpty(sortExpressions))
            {
                strOrderby = " order by " + sortExpressions + "";//Grid控件自带的会加上ASC,DESC
            }
            return strOrderby;
        }


        public static DataSet GetDataByPage(int PageSize, int PageIndex, string sortExpressions, List<SqlCondition> filterExpression, string tableName, string primaryId, string sqlWhere = "")
        {
            int startRecord = PageSize * PageIndex;
            string sql = "select top " + PageSize + " * from  "+tableName+" where 1=1";
            sql += GetWhere(filterExpression, sqlWhere);
            sql += " and " + primaryId + " not in(select top " + startRecord + " " + primaryId + " from " + tableName + " where 1=1";
            sql += GetWhere(filterExpression, sqlWhere);
            sql += GetOrderby(sortExpressions, primaryId);
            sql += ")";
            sql += GetOrderby(sortExpressions, primaryId);

            return ExecuteDataSet(sql);
        }

        public static int GetDataCount(List<SqlCondition> filterExpression, string tableName, string primaryId, string sqlWhere = "")
        {
            string sql = "select COUNT("+primaryId+") from "+tableName+" where 1=1";
            sql += GetWhere(filterExpression, sqlWhere);

            return (int)GetSingle(sql);
        }

        public static DataSet GetByIDsForExcel(string IDs, string sortExpressions, List<SqlCondition> filterExpression, string tableName, string primaryId, string sqlWhere = "")
        {
            string sql = "select * from "+tableName+" where 1=1";
            if (!string.IsNullOrEmpty(IDs))
            {
                sql += " and "+primaryId+" in(" + IDs + ")";
            }
            sql += GetWhere(filterExpression, sqlWhere);
            sql += GetOrderby(sortExpressions,primaryId);
            return ExecuteDataSet(sql);
        }

        /// <summary>
        /// 建'替换为''在加上''
        /// </summary>
        public static string FormatDBParam(string param)
        {
            return (param == null ? "null" : "'" + param.Replace("'", "''").Trim() + "'");
        }

        /// <summary>
        /// 将单引号替换为两个单引号
        /// </summary>
        public static string FormatQuotes(string param)
        {
            return (param == null ? "null" : param.Replace("'", "''"));
        }

        /// <summary>
        /// 日期类型的参数
        /// </summary>
        public static string FormatDBParam(DateTime ? param)
        {
            return (param == null ? "null" : "'" + param.ToString().Trim() + "'");
        }

        /// <summary>
        /// 货币类型的参数
        /// </summary>
        public static string FormatDBParam(Decimal? param)
        {
            return (param == null ? "null" : "'" + param.ToString().Trim() + "'");
        }

        /// <summary>
        /// 整数型的参数
        /// </summary>
        public static string FormatDBParam(int? param)
        {
            return (param == null ? "null" : "'" + param.ToString().Trim() + "'");
        }

        /// <summary>
        /// 浮点型的参数
        /// </summary>
        public static string FormatDBParam(float? param)
        {
            return (param == null ? "null" : "'" + param.ToString().Trim() + "'");
        }

        #endregion
    }

    /// <summary>
    /// 数据库条件
    /// </summary>
    public class SqlCondition
    {
        /// <summary>
        /// 列名
        /// </summary>
        public string ColumnName { get; set; }
        /// <summary>
        /// sql运算符
        /// </summary>
        public string SqlComparison { get; set; }
        /// <summary>
        /// 比较的数据
        /// </summary>
        public string Data { get; set; }
    }

    /// <summary>
    /// sql运算符枚举
    /// </summary>
    public enum EnumSqlComparison
    { 
        /// <summary>
        /// 等于
        /// </summary>
        Equal,
        /// <summary>
        /// 大于
        /// </summary>
        Greater,
        /// <summary>
        /// 小于
        /// </summary>
        Less,
        /// <summary>
        /// 大于等于
        /// </summary>
        GreaterEqual,
        /// <summary>
        /// 小于等于
        /// </summary>
        LessEqual,
        /// <summary>
        /// 不等于
        /// </summary>
        NotEqual,
        /// <summary>
        /// like
        /// </summary>
        Like,
        /// <summary>
        /// in
        /// </summary>
        In
    }
}