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


namespace DSWeb.DataAccess
{
    /// <summary>
    /// 数据库的通用访问代码
    /// 此类为抽象类，不允许实例化，在应用时直接调用即可
    /// </summary>
    public abstract class SqlHelper
    {
        //获取数据库连接字符串，其属于静态变量且只读，项目中所有文档可以直接使用，但不能修改
        public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["DongShengDB"].ConnectionString;
        //public static readonly string CSLTDSDB = ConfigurationManager.ConnectionStrings["dscustserviceDB"].ConnectionString;
        //public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString2"].ConnectionString;
        //public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString3"].ConnectionString;
        //public static readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["SQLProfileConnString"].ConnectionString;

        // 哈希表用来存储缓存的参数信息，哈希表可以存储任意类型的参数。
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        private static SqlConnection _sqlConnection;


        /// <summary>
        ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。
        /// 使用参数数组形式提供参数列表 
        /// </summary>
        /// <remarks>
        /// 使用示例：
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();

            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                //通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                int val = cmd.ExecuteNonQuery();

                //清空SqlCommand中的参数列表
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>
        ///执行一条不返回结果的SqlCommand，通过一个已经存在的数据库连接 
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例：  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="conn">一个现有的数据库连接</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</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;
        }


        /// <summary>
        /// 执行一条不返回结果的SqlCommand，通过一个已经存在的数据库事物处理 
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例： 
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="trans">一个存在的 sql 事物处理</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static DataSet ExecuteQueryDataset(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            DataSet ds = null;
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                ds = new DataSet();

                // Fill the DataSet using default values for DataTable names, etc
                da.Fill(ds);

                // Detach the SqlParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
            }
            return ds;
        }

        /// <summary>
        /// 执行一条不返回结果的SqlCommand，通过一个已经存在的数据库事物处理 
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例： 
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="trans">一个存在的 sql 事物处理</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static SqlDataReader ExecuteQueryReader(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            SqlDataReader val = cmd.ExecuteReader();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// 执行一条不返回结果的SqlCommand，通过一个已经存在的数据库事物处理 
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例： 
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="trans">一个存在的 sql 事物处理</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</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;
        }

        /// <summary>
        /// 执行一条返回结果集的SqlCommand命令，通过专用的连接字符串。
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例：  
        ///  SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个包含结果的SqlDataReader</returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);

            // 在这里使用try/catch处理是因为如果方法出现异常，则SqlDataReader就不存在，
            //CommandBehavior.CloseConnection的语句就不会执行，触发的异常由catch捕获。
            //关闭数据库连接，并通过throw再次引发捕捉到的异常。
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                conn.Dispose();
                throw;
            }
        }

        /// <summary>
        /// 执行一条返回第一条记录第一列的SqlCommand命令，通过专用的连接字符串。 
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例：  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个object类型的数据，可以通过 Convert.To{Type}方法转换类型</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;
            }
        }

        /// <summary>
        /// 执行一条返回第一条记录第一列的SqlCommand命令，通过已经存在的数据库连接。
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例： 
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="conn">一个已经存在的数据库连接</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个object类型的数据，可以通过 Convert.To{Type}方法转换类型</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;
        }

        /// <summary>
        /// 执行 SQL 语句
        /// </summary>
        /// <param name="sql">SQL 语句</param>
        /// <param name="p">参数集</param>
        /// <returns></returns>
        public static DataTable ExecuteSql(string sql)
        {
            //创建命令
            SqlCommand comm = new SqlCommand()
            {
                CommandText = sql//SQL语句
            };
            return ExecuteSearch(comm, null);
        }
        /// <summary>
        /// 执行 SQL 语句
        /// </summary>
        /// <param name="comm">执行的命令</param>
        /// <param name="p">参数集</param>
        /// <returns>查询的结果集</returns>
        private static DataTable ExecuteSearch(SqlCommand comm, params SqlParameter[] p)
        {
            //获得返回集实例
            //_result = Utility.Result.GetInstance();
            DataTable dt = new DataTable();
            //创建连接
            using (SqlConnection conn = new SqlConnection(ConnectionStringLocalTransaction))
            {
                //设置参数
                if (p != null && p.Length > 0)
                {
                    foreach (SqlParameter item in p)
                    {
                        comm.Parameters.Add(item);
                    }
                }
                comm.Connection = conn;
                SqlDataAdapter da = new SqlDataAdapter(comm);
                //填充数据
                da.Fill(dt);
                conn.Close();
                conn.Dispose();
            }
            return dt;
        }

        /// <summary>
        /// 缓存参数数组
        /// </summary>
        /// <param name="cacheKey">参数缓存的键值</param>
        /// <param name="cmdParms">被缓存的参数列表</param>
        public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }

        /// <summary>
        /// 获取被缓存的参数
        /// </summary>
        /// <param name="cacheKey">用于查找参数的KEY值</param>
        /// <returns>返回缓存的参数数组</returns>
        public static SqlParameter[] GetCachedParameters(string cacheKey)
        {
            SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];

            if (cachedParms == null)
                return null;

            //新建一个参数的克隆列表
            SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];

            //通过循环为克隆参数列表赋值
            for (int i = 0, j = cachedParms.Length; i < j; i++)
                //使用clone方法复制参数列表中的参数
                clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();

            return clonedParms;
        }

        /// <summary>
        /// 为执行命令准备参数
        /// </summary>
        /// <param name="cmd">SqlCommand 命令</param>
        /// <param name="conn">已经存在的数据库连接</param>
        /// <param name="trans">数据库事物处理</param>
        /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">Command text，T-SQL语句 例如 Select * from Products</param>
        /// <param name="cmdParms">返回带参数的命令</param>
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {

            //判断数据库连接状态
            if (conn.State != ConnectionState.Open)
                conn.Open();

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

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

            cmd.CommandType = cmdType;

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

        /// <summary>
        /// 事务操作 ADD 2011-4-2 JHQ
        /// </summary>
        /// <param name="con"></param>
        /// <returns></returns>
        public static SqlTransaction BeginTransaction(string con)
        {
            //SqlConnection connection = new SqlConnection(con);
            _sqlConnection = new SqlConnection(con);
            _sqlConnection.Open();
            SqlTransaction tran = _sqlConnection.BeginTransaction();
            return tran;
        }

        #region z
        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
        {
            DataSet ds = null;
            bool mustCloseConnection = false;
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            SqlCommand command = null;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                if (connection.State != ConnectionState.Open)
                {
                    mustCloseConnection = true;
                    connection.Open();
                }
                else
                {
                    mustCloseConnection = false;
                }
                command = new SqlCommand();
                // Associate the connection with the command
                command.Connection = connection;

                // Set the command text (stored procedure name or SQL statement)
                command.CommandText = commandText;
                using (SqlDataAdapter da = new SqlDataAdapter(command))
                {
                    ds = new DataSet();

                    // Fill the DataSet using default values for DataTable names, etc
                    da.Fill(ds);

                    // Detach the SqlParameters from the command object, so they can be used again
                    command.Parameters.Clear();

                    if (mustCloseConnection)
                    {
                        connection.Close();
                        connection.Dispose();
                    }
                }
            }
            return ds;
        }
        #endregion

        
        #region 直接执行语句返回数据集或执行结果true/false
        /// <summary>
        /// 直接执行语句返回数据集
        /// </summary>
        /// <param name="connectionstring">数据库连接字符串</param>
        /// <param name="sqltext">查询语句</param>
        /// <returns></returns>
        public static DataSet OpenSqlDataSet(string connectionstring, string sqltext)
        {
            SqlConnection Conn = new SqlConnection(connectionstring);
            //	Conn.ConnectionTimeout=600;
            Conn.Open();
            DataSet MyDataSet = new DataSet();
            try
            {
                SqlDataAdapter MyAdapter = new SqlDataAdapter(sqltext, Conn);
                MyAdapter.SelectCommand.CommandTimeout = 6000;
                MyAdapter.Fill(MyDataSet);
            }
            catch(Exception e)
            {
                MyDataSet = null;
                throw e;
            }
            finally
            {
                Conn.Close();
                Conn.Dispose();
            }
            return MyDataSet;
        }
        /// <summary>
        /// 直接执行语句返回数据集
        /// </summary>
        /// <param name="connectionstring">数据库连接字符串</param>
        /// <param name="StoredProcedureName">存储过程名</param>
        /// <param name="myParamArray">查询语句或参数集</param>
        /// <returns></returns>
        public static DataSet RunProcedure(string connectionstring, string StoredProcedureName, SqlParameter[] myParamArray)
        {
            SqlConnection Conn = new SqlConnection(connectionstring);
            Conn.Open();
            SqlCommand MyCommand = new SqlCommand(StoredProcedureName, Conn);
            MyCommand.CommandTimeout = 6000;
            MyCommand.CommandType = CommandType.StoredProcedure;
            MyCommand.CommandText = StoredProcedureName;
            MyCommand.Parameters.Clear();
            for (int j = 0; j < myParamArray.Length; j++)
            {
                MyCommand.Parameters.Add(myParamArray[j]);
            }
            SqlDataAdapter MyAdapter = new SqlDataAdapter();
            MyAdapter.SelectCommand = MyCommand;
            DataSet MyDataSet = new DataSet();
            MyAdapter.Fill(MyDataSet);
            Conn.Close();
            Conn.Dispose();
            return MyDataSet;
        }
        /// <summary>
        /// 直接执行语句返回执行结果true/false
        /// </summary>
        /// <param name="connectionstring">数据库连接字符串</param>
        /// <param name="sqltext">执行语句</param>
        /// <returns></returns>
        public static bool ExecuteSqlCommand(string connectionstring, string sqltext)
        {
            bool bRtn;
            try
            {
                SqlConnection Conn = new SqlConnection(connectionstring);
                Conn.Open();
                SqlTransaction myTrans = Conn.BeginTransaction();
                SqlCommand MyCommand = new SqlCommand(sqltext, Conn, myTrans);
                MyCommand.CommandTimeout = 6000;
                try
                {
                    MyCommand.ExecuteNonQuery();
                    myTrans.Commit();
                    bRtn = true;
                }
                catch
                {
                    myTrans.Rollback();
                    bRtn = false;
                }
                finally
                {
                    Conn.Close();
                    Conn.Dispose();
                }
            }
            catch { bRtn = false; }
            return bRtn;
        }
        /// <summary>
        /// 直接执行语句返回执行结果true/false，无事务
        /// </summary>
        /// <param name="connectionstring">数据库连接字符串</param>
        /// <param name="sqltext">执行语句</param>
        /// <returns></returns>
        public static bool ExecuteSql(string connectionstring, string sqltext)
        {
            bool bRtn;
            try
            {
                SqlConnection Conn = new SqlConnection(connectionstring);
                Conn.Open();
                SqlCommand MyCommand = new SqlCommand(sqltext, Conn);
                MyCommand.CommandTimeout = 6000;
                try
                {
                    MyCommand.ExecuteNonQuery();
                    bRtn = true;
                }
                catch (Exception execError)
                {
                    bRtn = false;
                    throw execError;
                }
                finally
                {
                    Conn.Close();
                    Conn.Dispose();
                }
            }
            catch (Exception execError2)
            {
                bRtn = false;
                throw execError2;
            }
            return bRtn;
        }
        /// <summary>
        /// 直接执行语句返回执行结果true/false
        /// </summary>
        /// <param name="connectionstring">数据库连接字符串</param>
        /// <param name="StoredProcedureName">存储过程名</param>
        /// <param name="myParamArray">执行语句或参数集</param>
        /// <returns></returns>
        public static bool ExecuteSqlStoredProcedure(string connectionstring, string StoredProcedureName, SqlParameter[] myParamArray)
        {
            bool bRtn;
            try
            {
                SqlConnection Conn = new SqlConnection(connectionstring);
                Conn.Open();
                SqlTransaction myTrans = Conn.BeginTransaction();
                SqlCommand MyCommand = new SqlCommand();
                MyCommand.Connection = Conn;
                MyCommand.Transaction = myTrans;
                MyCommand.CommandTimeout = 6000;
                MyCommand.CommandType = CommandType.StoredProcedure;
                MyCommand.CommandText = StoredProcedureName;
                MyCommand.Parameters.Clear();
                for (int j = 0; j < myParamArray.Length; j++)
                {
                    MyCommand.Parameters.Add(myParamArray[j]);
                }
                try
                {
                    MyCommand.ExecuteNonQuery();
                    myTrans.Commit();
                    bRtn = true;
                }
                catch
                {
                    myTrans.Rollback();
                    bRtn = false;
                }
                finally
                {
                    Conn.Close();
                    Conn.Dispose();
                }
            }
            catch { bRtn = false; }
            return bRtn;
        }

        /// <summary>
        /// 直接执行语句返回执行结果true/false
        /// </summary>
        /// <param name="connectionstring">数据库连接字符串</param>
        /// <param name="StoredProcedureName">存储过程名</param>
        /// <param name="myParamArray">执行语句或参数集</param>
        /// <returns></returns>
        public static int ExecuteSqlStoredProcedureReturn(SqlConnection Conn, string StoredProcedureName, SqlParameter[] myParamArray)
        {
            int iResult = 0;
            try
            {
                //SqlConnection Conn = new SqlConnection(connectionstring);
                Conn.Open();
                SqlTransaction myTrans = Conn.BeginTransaction();
                SqlCommand MyCommand = new SqlCommand();
                MyCommand.Connection = Conn;
                MyCommand.Transaction = myTrans;
                MyCommand.CommandTimeout = 6000;
                MyCommand.CommandType = CommandType.StoredProcedure;
                MyCommand.CommandText = StoredProcedureName;
                MyCommand.Parameters.Clear();
                for (int j = 0; j < myParamArray.Length; j++)
                {
                    MyCommand.Parameters.Add(myParamArray[j]);
                }
                MyCommand.Parameters.Add("@RETURN_VALUE", "").Direction = ParameterDirection.ReturnValue;  
                try
                {
                    MyCommand.ExecuteNonQuery();
                    iResult = int.Parse(MyCommand.Parameters["@RETURN_VALUE"].Value.ToString().Trim());
                    myTrans.Commit();
                    //iResult = 1;
                }
                catch(Exception ee)
                {
                    myTrans.Rollback();
                    iResult = -1;
                    throw ee;
                }
                finally
                {
                    Conn.Close();
                    Conn.Dispose();
                }
            }
            catch(Exception eee)
            {
                iResult = -1;
                throw eee;
            }
            return iResult;
        }

        /// <summary>
        /// 直接执行语句返回执行结果true/false
        /// </summary>
        /// <param name="connectionstring">数据库连接字符串</param>
        /// <param name="StoredProcedureName">存储过程名</param>
        /// <param name="myParamArray">执行语句或参数集</param>
        /// <returns></returns>
        public static string ExecuteSqlStoredProcedureReturnString(SqlConnection Conn, string StoredProcedureName, SqlParameter[] myParamArray)
        {
            string sResult = "";
            try
            {
                //SqlConnection Conn = new SqlConnection(connectionstring);
                Conn.Open();
                SqlTransaction myTrans = Conn.BeginTransaction();
                SqlCommand MyCommand = new SqlCommand();
                MyCommand.Connection = Conn;
                MyCommand.Transaction = myTrans;
                MyCommand.CommandTimeout = 6000;
                MyCommand.CommandType = CommandType.StoredProcedure;
                MyCommand.CommandText = StoredProcedureName;
                MyCommand.Parameters.Clear();
                for (int j = 0; j < myParamArray.Length; j++)
                {
                    MyCommand.Parameters.Add(myParamArray[j]);
                }
                MyCommand.Parameters.Add("@RETURN_VALUE", SqlDbType.VarChar,100).Direction = ParameterDirection.Output;  
                try
                {
                    MyCommand.ExecuteNonQuery();
                    sResult = MyCommand.Parameters["@RETURN_VALUE"].Value.ToString().Trim();
                    myTrans.Commit();
                    //iResult = 1;
                }
                catch(Exception ee)
                {
                    myTrans.Rollback();
                    sResult = "error";
                    throw ee;
                }
                finally
                {
                    Conn.Close();
                    Conn.Dispose();
                }
            }
            catch(Exception eee)
            {
                sResult = "error";
                throw eee;
            }
            return sResult;
        }
        #endregion

        public static void CloseConnection()
        {
            if (_sqlConnection != null)
            {
                if (_sqlConnection.State == ConnectionState.Open)
                {
                    _sqlConnection.Close();
                    _sqlConnection.Dispose();
                }
            }
        }

        /// <summary>
        /// 执行一条返回第一条记录第一列的SqlCommand命令，通过已经存在的数据库连接。(事务操作)
        /// 使用参数数组提供参数
        /// </summary>
        /// <remarks>
        /// 使用示例： 
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="trans">一个存在的 sql 事物处理</param>
        /// <param name="commandType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
        public static object ExecuteScalar(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            object val = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            return val;
        }
        //
    }
}