SQLServer （1）封装SqlHelper【包含事务】

使用方式

SqlHelper SqlHelp = new SqlHelper();
 SqlHelp.Open();
//开启事务
 SqlHelp.TranBegin();
//执行各种SQL语句

//提交事务
  SqlHelp.TranCommit();
//回滚事务
SqlHelp.TranRollBack();

 SqlHelp.Close();

public class SqlHelper
    {
        public SqlHelper()
        {

        }
        /// <summary>
        /// 数据库连接串
        /// </summary>
        public static string connStr = ConfigurationManager.AppSettings["DBConStr"];
        /// <summary>
        /// 声明sqlConn的连接
        /// </summary>
        public SqlConnection sqlConn = null;
        /// <summary>
        /// 声明sqlTrans事务
        /// </summary>
        public SqlTransaction sqlTrans = null;
        /// <summary>
        /// 声明sqlCmd命令
        /// </summary>
        public SqlCommand sqlCmd = null;

        /// <summary>
        /// 打开连接
        /// </summary>
        public void Open()
        {
            if (sqlConn == null)
            {
                sqlConn = new SqlConnection(connStr);
            }
            if (sqlConn.State != ConnectionState.Open)
            {
                sqlConn.Open();
            }
        }

        /// <summary>
        /// 打开其他的数据库
        /// 重写
        /// </summary>
        /// <param name="conStr"></param>
        public void Open(string conStr)
        {
            if (sqlConn == null)
            {
                sqlConn = new SqlConnection(conStr);
            }
            if (sqlConn.State != ConnectionState.Open)
            {
                sqlConn.Open();
            }
        }
        /// <summary>
        /// 关闭连接
        /// </summary>
        public void Close()
        {
            if (sqlConn != null && sqlConn.State == ConnectionState.Open)
            {
                sqlConn.Close();
            }
        }
        /// <summary>
        /// 开始事务
        /// </summary>
        public void TranBegin()
        {
            sqlCmd = new SqlCommand();
            sqlCmd.Connection = sqlConn;
            sqlTrans = sqlConn.BeginTransaction();
            sqlCmd.CommandTimeout = 120;
            sqlCmd.Transaction = sqlTrans;
        }
        /// <summary>
        /// 提交事务
        /// </summary>
        public void TranCommit()
        {
            sqlTrans.Commit();
        }
        /// <summary>
        /// 回滚事务
        /// </summary>
        public void TranRollBack()
        {
            if (sqlTrans != null && sqlTrans.Connection != null)
            {
                sqlTrans.Rollback();
            }
        }

        #region private utility methods & constructors

        /// <summary>
        /// This method is used to attach array of SqlParameters to a SqlCommand.
        /// This method will assign a value of DbNull to any parameter with a direction of
        /// InputOutput and a value of null.
        /// This behavior will prevent default values from being used, but
        /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
        /// where the user provided no input value.
        /// </summary>
        /// <param name="command">The command to which the parameters will be added</param>
        /// <param name="commandParameters">an array of SqlParameters tho be added to command</param>
        private void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
        {
            foreach (SqlParameter p in commandParameters)
            {
                //check for derived output value with no value assigned
                if ((p.Direction == ParameterDirection.InputOutput) && (p.Value == null))
                {
                    p.Value = DBNull.Value;
                }

                command.Parameters.Add(p);
            }
        }

        /// <summary>
        /// This method assigns an array of values to an array of SqlParameters.
        /// </summary>
        /// <param name="commandParameters">array of SqlParameters to be assigned values</param>
        /// <param name="parameterValues">array of Components holding the values to be assigned</param>
        private void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
        {
            if ((commandParameters == null) || (parameterValues == null))
            {
                //do nothing if we get no data
                return;
            }

            // we must have the same number of values as we pave parameters to put them in
            if (commandParameters.Length != parameterValues.Length)
            {
                throw new ArgumentException("Parameter count does not match Parameter Value count.");
            }

            //iterate through the SqlParameters, assigning the values from the corresponding position in the 
            //value array
            for (int i = 0, j = commandParameters.Length; i < j; i++)
            {
                commandParameters[i].Value = parameterValues[i];
            }
        }

        /// <summary>
        /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
        /// to the provided command.
        /// </summary>
        /// <param name="command">the SqlCommand to be prepared</param>
        /// <param name="connection">a valid SqlConnection, on which to execute this command</param>
        /// <param name="transaction">a valid SqlTransaction, or 'null'</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
        private void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters)
        {
            //if the provided connection is not open, we will open it
            if (connection.State != ConnectionState.Open)
            {
                connection.Open();
            }

            //associate the connection with the command
            command.Connection = connection;
            command.CommandTimeout = 300;

            //set the command text (stored procedure name or SQL statement)
            command.CommandText = commandText;

            //if we were provided a transaction, assign it.
            if (transaction != null)
            {
                command.Transaction = transaction;
            }

            //set the command type
            command.CommandType = commandType;

            //attach the command parameters if they are provided
            if (commandParameters != null)
            {
                AttachParameters(command, commandParameters);
            }

            return;
        }

        /// <summary>
        /// ExecuteNonQuery方法专用
        /// 可以把方法都放到一个事务中
        /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
        /// to the provided command.
        /// </summary>
        /// <param name="command">the SqlCommand to be prepared</param>
        /// <param name="connection">a valid SqlConnection, on which to execute this command</param>
        /// <param name="transaction">a valid SqlTransaction, or 'null'</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
        private void PrepareCommand(CommandType commandType, string commandText, SqlParameter[] commandParameters)
        {
            //if the provided connection is not open, we will open it

            if (sqlConn.State != ConnectionState.Open)
            {
                sqlConn.Open();
            }

            //set the command text (stored procedure name or SQL statement)
            sqlCmd.CommandText = commandText;

            //set the command type
            sqlCmd.CommandType = commandType;

            //attach the command parameters if they are provided
            if (commandParameters != null)
            {
                AttachParameters(sqlCmd, commandParameters);
            }

            return;
        }


        #endregion private utility methods & constructors

        #region DataHelpers

        public string CheckNull(object obj)
        {
            return (string)obj;
        }

        public string CheckNull(DBNull obj)
        {
            return null;
        }

        #endregion

        #region AddParameters

        public object CheckForNullString(string text)
        {
            if (text == null || text.Trim().Length == 0)
            {
                return DBNull.Value;
            }
            else
            {
                return text;
            }
        }

        public SqlParameter MakeInParam(string ParamName, object Value)
        {
            return new SqlParameter(ParamName, Value);
        }

        /// <summary>
        /// Make input param.
        /// </summary>
        /// <param name="ParamName">Name of param.</param>
        /// <param name="DbType">Param type.</param>
        /// <param name="Size">Param size.</param>
        /// <param name="Value">Param value.</param>
        /// <returns>New parameter.</returns>
        public SqlParameter MakeInParam(string ParamName, SqlDbType DbType, Int32 Size, object Value)
        {
            return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
        }

        /// <summary>
        /// Make input param.
        /// </summary>
        /// <param name="ParamName">Name of param.</param>
        /// <param name="DbType">Param type.</param>
        /// <param name="Size">Param size.</param>
        /// <returns>New parameter.</returns>
        public SqlParameter MakeOutParam(string ParamName, SqlDbType DbType, int Size)
        {
            return MakeParam(ParamName, DbType, Size, ParameterDirection.Output, null);
        }

        /// <summary>
        /// Make stored procedure param.
        /// </summary>
        /// <param name="ParamName">Name of param.</param>
        /// <param name="DbType">Param type.</param>
        /// <param name="Size">Param size.</param>
        /// <param name="Direction">Parm direction.</param>
        /// <param name="Value">Param value.</param>
        /// <returns>New parameter.</returns>
        public SqlParameter MakeParam(string ParamName, SqlDbType DbType, int Size, ParameterDirection Direction, object Value)
        {
            SqlParameter param;

            if (Size > 0)
                param = new SqlParameter(ParamName, DbType, Size);
            else
                param = new SqlParameter(ParamName, DbType);

            param.Direction = Direction;
            if (!(Direction == ParameterDirection.Output && Value == null))
                param.Value = Value;

            return param;
        }

        /// <summary>
        /// 把Hashtable转化为SqlParameter参数组
        /// </summary>
        /// <param name="ParamList">Hashtable</param>
        /// <returns></returns>
        public SqlParameter[] MakeAllParam(Hashtable ParamList)
        {
            SqlParameter[] p1 = new SqlParameter[ParamList.Count];
            int i = 0;
            System.Collections.IDictionaryEnumerator CacheEnum = ParamList.GetEnumerator();

            while (CacheEnum.MoveNext())
            {
                p1[i] = MakeInParam(CacheEnum.Key.ToString(), CacheEnum.Value);
                i++;
            }
            return p1;
        }


        #endregion

        #region ExecuteNonQuery

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public int ExecuteNonQuery(CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            PrepareCommand(commandType, commandText, commandParameters);

            //finally, execute the command.
            int retval = sqlCmd.ExecuteNonQuery();

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

            return retval;
        }

        /// <summary>
        /// 执行一个简单的Sqlcommand 没有返回结果
        /// </summary>
        ///  例如:  
        ///  int result = ExecuteNonQuery("delete from test where 1>2 ");  返回 result =0
        /// <param name="commandText">只能是sql语句</param>
        /// <returns>受影响的行数</returns>
        public int ExecuteNonQuery(string commandText)
        {
            return ExecuteNonQuery(CommandType.Text, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// 执行一个简单的Sqlcommand 没有返回结果
        /// </summary>
        /// 例如:    
        ///  int result = ExecuteNonQuery("delete from test where  tt =@tt", new SqlParameter("@tt", 24));
        /// <param name="commandText">只能是sql语句</param>
        /// <param name="commandParameters">参数</param>
        /// <returns>受影响的行数</returns>
        public int ExecuteNonQuery(string commandText, params SqlParameter[] commandParameters)
        {
            return ExecuteNonQuery(CommandType.Text, commandText, commandParameters);
        }
        /// <summary>
        /// 执行一个简单的Sqlcommand 没有返回结果
        /// 参数是Hashtable
        /// </summary>
        /// <param name="commandText">只能是sql语句</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns>受影响的行数</returns>
        public int ExecuteNonQuery(string commandText, Hashtable commandParameters)
        {
            return ExecuteNonQuery(CommandType.Text, commandText, MakeAllParam(commandParameters));
        }

        #endregion ExecuteNonQuery

        #region SqlDataAdapter

        public SqlDataAdapter ExecuteSqlDataAdapter(string commandText, params SqlParameter[] commandParameters)
        {
            SqlConnection cn = new SqlConnection();
            cn.ConnectionString = connStr;

            cn.Open();
            SqlDataAdapter myda = new SqlDataAdapter(commandText, cn);
            foreach (SqlParameter p in commandParameters)
            {
                //check for derived output value with no value assigned
                if ((p.Direction == ParameterDirection.InputOutput) && (p.Value == null))
                {
                    p.Value = DBNull.Value;
                }
                myda.SelectCommand.Parameters.Add(p);
            }
            cn.Close();
            return myda;
        }

        /// <summary>
        /// 构建DataAdapter的方法，
        /// </summary>
        /// <param name="commandText"></param>
        /// <param name="paramsTable"></param>
        /// <returns></returns>
        public SqlDataAdapter ExecuteSqlDataAdapter(string commandText, Hashtable paramsTable)
        {
            return ExecuteSqlDataAdapter(commandText, MakeAllParam(paramsTable));
        }
        /// <summary>
        /// 构建DataAdapter的方法，
        /// </summary>
        /// <param name="commandText">简单sql语句</param>
        /// <returns>返回值</returns>
        public SqlDataAdapter ExecuteSqlDataAdapter(string commandText)
        {
            SqlConnection cn = new SqlConnection();
            cn.ConnectionString = connStr;
            cn.Open();
            SqlDataAdapter myda = new SqlDataAdapter(commandText, cn);
            cn.Close();

            return myda;
        }

        #endregion

        #region ExecuteDataSet

        /// <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 DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </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>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create & open a SqlConnection, and dispose of it after we are done.
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();

                //call the overload that takes a connection in place of the connection string
                return ExecuteDataset(cn, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">a valid 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 DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //SqlNotice st = new SqlNotice();
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet 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();

            //st.End("ExecuteDataset_1", commandText);
            //return the dataset
            return ds;
        }


        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</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 DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet 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();

            //st.End("ExecuteDataset_2", commandText);
            //return the dataset
            return ds;
        }

        /// <summary>
        /// 返回datataset 只需要传入查询语句
        /// </summary>
        /// <param name="commandText"></param>
        /// <returns></returns>
        public DataSet ExecuteDataset(string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataset(connStr, CommandType.Text, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// 带参数查询
        /// </summary>
        /// <param name="commandText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public DataSet ExecuteDataset(string commandText, params SqlParameter[] commandParameters)
        {
            using (SqlConnection cn = new SqlConnection(connStr))
            {
                cn.Open();
                return ExecuteDataset(cn, CommandType.Text, commandText, commandParameters);
            }
        }
        /// <summary>
        /// 返回DataSet
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns>返回结果</returns>
        public DataSet ExecuteDataset(string commandText, Hashtable commandParameters)
        {
            using (SqlConnection cn = new SqlConnection(connStr))
            {
                cn.Open();
                return ExecuteDataset(cn, CommandType.Text, commandText, MakeAllParam(commandParameters));
            }
        }

        /// <summary>
        /// 执行存储过程 返回相应的dataset
        /// </summary>
        /// <param name="commandText">存储过程名字</param>
        /// <param name="commandType"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public DataSet ExecuteDataset(string commandText, CommandType commandType, params SqlParameter[] commandParameters)
        {
            using (SqlConnection cn = new SqlConnection(connStr))
            {
                cn.Open();
                return ExecuteDataset(cn, commandType, commandText, commandParameters);
            }
        }
        /// <summary>
        /// 执行sql语句时 返回相应的dataset
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandType">参数类型</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns>返回值</returns>
        public DataSet ExecuteDataset(string commandText, CommandType commandType, Hashtable commandParameters)
        {
            using (SqlConnection cn = new SqlConnection(connStr))
            {
                cn.Open();
                return ExecuteDataset(cn, commandType, commandText, MakeAllParam(commandParameters));
            }
        }

        /// <summary>
        /// 事务中执行返回dataset
        /// </summary>
        /// <param name="transaction"></param>
        /// <param name="commandText"></param>
        /// <returns></returns>
        public DataSet ExecuteDataset(SqlTransaction transaction, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataset(transaction, CommandType.Text, commandText, (SqlParameter[])null);
        }
        /// <summary>
        /// 事务中执行返回dataset 可带Hashtable参数
        /// </summary>
        /// <param name="transaction">事务</param>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns></returns>
        public DataSet ExecuteDataset(SqlTransaction transaction, string commandText, Hashtable commandParameters)
        {
            return ExecuteDataset(transaction, commandText, MakeAllParam(commandParameters));
        }

        /// <summary>
        /// 事务中返回dataset 可带参数
        /// </summary>
        /// <param name="transaction"></param>
        /// <param name="commandText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public DataSet ExecuteDataset(SqlTransaction transaction, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, CommandType.Text, commandText, commandParameters);

            //create the DataAdapter & DataSet
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);

            cmd.Parameters.Clear();
            return ds;
        }


        #endregion ExecuteDataSet

        #region ExecuteDataTable

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(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 DataTable containing the resultset generated by the command</returns>
        public DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </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>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a DataTable containing the resultset generated by the command</returns>
        public DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create & open a SqlConnection, and dispose of it after we are done.
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();

                //call the overload that takes a connection in place of the connection string
                return ExecuteDataTable(cn, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">a valid 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 DataTable containing the resultset generated by the command</returns>
        public DataTable ExecuteDataTable(SqlConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a DataTable containing the resultset generated by the command</returns>
        public DataTable ExecuteDataTable(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);

            //create the DataAdapter & DataTable
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();

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

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

            return dt;
        }


        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</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 DataTable containing the resultset generated by the command</returns>
        public DataTable ExecuteDataTable(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a DataTable containing the resultset generated by the command</returns>
        public DataTable ExecuteDataTable(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            //create the DataAdapter & DataTable
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();

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

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

            //return the DataTable
            return dt;
        }


        /// <summary>
        /// 返回DataTable
        /// </summary>
        /// <param name="commandText">简单sql语句</param>
        /// <returns></returns>
        public DataTable ExecuteDataTable(string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connStr, CommandType.Text, commandText, (SqlParameter[])null);
        }
        /// <summary>
        /// 返回DataTable
        /// </summary>
        /// <param name="connectionString">连接串</param>
        /// <param name="commandText">简单sql语句</param>
        /// <returns></returns>
        public DataTable ExecuteDataTable(string connectionString, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connectionString, CommandType.Text, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// 返回DataTable
        /// </summary>
        /// <param name="commandText">简单sql语句</param>
        /// <param name="commandParameters">可以连接到的参数</param>
        /// <returns></returns>
        public DataTable ExecuteDataTable(string commandText, params SqlParameter[] commandParameters)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connStr, CommandType.Text, commandText, commandParameters);
        }

        /// <summary>
        /// 返回DataTable 可带Hashtable参数
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns></returns>
        public DataTable ExecuteDataTable(string commandText, Hashtable commandParameters)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connStr, CommandType.Text, commandText, MakeAllParam(commandParameters));
        }

        #endregion ExecuteDataTable

        #region ExecuteReader

        /// <summary>
        /// this enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
        /// we can set the appropriate CommandBehavior when calling ExecuteReader()
        /// </summary>
        private enum SqlConnectionOwnership
        {
            /// <summary>Connection is owned and managed by SqlHelper</summary>
            Internal,
            /// <summary>Connection is owned and managed by the caller</summary>
            External
        }

        /// <summary>
        /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
        /// </summary>
        /// <remarks>
        /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
        /// 
        /// If the caller provided the connection, we want to leave it to them to manage.
        /// </remarks>
        /// <param name="connection">a valid SqlConnection, on which to execute this command</param>
        /// <param name="transaction">a valid SqlTransaction, or 'null'</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
        /// <param name="connectionOwnership">indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
        /// <returns>SqlDataReader containing the results of the command</returns>
        private SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
        {
            //SqlNotice st = new SqlNotice();
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);

            //create a reader
            SqlDataReader dr;

            // call ExecuteReader with the appropriate CommandBehavior
            if (connectionOwnership == SqlConnectionOwnership.External)
            {
                dr = cmd.ExecuteReader();
            }
            else
            {
                dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }

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

            // st.End("ExecuteReader_1", commandText);
            return dr;
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(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 SqlDataReader containing the resultset generated by the command</returns>
        public SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </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>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
        public SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create & open a SqlConnection
            SqlConnection cn = new SqlConnection(connectionString);
            cn.Open();

            try
            {
                //call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(cn, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
            }
            catch
            {
                //if we fail to return the SqlDatReader, we need to close the connection ourselves
                cn.Close();
                throw;
            }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">a valid 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 SqlDataReader containing the resultset generated by the command</returns>
        public SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
        public SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //pass through the call to the private overload using a null transaction value and an externally owned connection
            return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }


        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</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 SqlDataReader containing the resultset generated by the command</returns>
        public SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
        public SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //pass through to private overload, indicating that the connection is owned by the caller
            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

        /// <summary>
        /// 返回SqlDataReader 只是传入一条sql语句
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <returns></returns>
        public SqlDataReader ExecuteReader(string commandText)
        {
            return ExecuteReader(connStr, CommandType.Text, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// 返回SqlDataReader 只是传入一条sql语句和相应的参数
        /// </summary>
        /// <param name="commandText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public SqlDataReader ExecuteReader(string commandText, params SqlParameter[] commandParameters)
        {
            //create & open a SqlConnection
            SqlConnection cn = new SqlConnection(connStr);
            cn.Open();

            try
            {
                //call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(cn, null, CommandType.Text, commandText, commandParameters, SqlConnectionOwnership.Internal);
            }
            catch
            {
                //if we fail to return the SqlDatReader, we need to close the connection ourselves
                cn.Close();
                throw;
            }
        }

        /// <summary>
        /// 返回SqlDataReader 只是传入一条sql语句和相应的Hashtable参数
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns>返回值</returns>
        public SqlDataReader ExecuteReader(string commandText, Hashtable commandParameters)
        {
            //create & open a SqlConnection
            SqlConnection cn = new SqlConnection(connStr);
            cn.Open();

            try
            {
                //call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(cn, null, CommandType.Text, commandText, MakeAllParam(commandParameters), SqlConnectionOwnership.Internal);
            }
            catch
            {
                //if we fail to return the SqlDatReader, we need to close the connection ourselves
                cn.Close();
                throw;
            }
        }

        /// <summary>
        /// 返回SqlDataReader 只是传入一条sql语句和相应的参数
        /// </summary>
        /// <param name="commandText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public SqlDataReader ExecuteReader(string commandText, CommandType commandType, params SqlParameter[] commandParameters)
        {
            //create & open a SqlConnection
            SqlConnection cn = new SqlConnection(connStr);
            cn.Open();

            try
            {
                //call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(cn, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
            }
            catch
            {
                //if we fail to return the SqlDatReader, we need to close the connection ourselves
                cn.Close();
                throw;
            }
        }

        /// <summary>
        /// 返回SqlDataReader 只是传入一条sql语句和相应的Hashtable参数
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandType">参数类型</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns>返回值</returns>
        public SqlDataReader ExecuteReader(string commandText, CommandType commandType, Hashtable commandParameters)
        {
            //create & open a SqlConnection
            SqlConnection cn = new SqlConnection(connStr);
            cn.Open();

            try
            {
                //call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(cn, null, commandType, commandText, MakeAllParam(commandParameters), SqlConnectionOwnership.Internal);
            }
            catch
            {
                //if we fail to return the SqlDatReader, we need to close the connection ourselves
                cn.Close();
                throw;
            }
        }
        #endregion ExecuteReader

        #region ExecuteScalar

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
        /// </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>an object containing the value in the 1x1 resultset generated by the command</returns>
        public object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
        /// </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>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
        public object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create & open a SqlConnection, and dispose of it after we are done.
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();

                //call the overload that takes a connection in place of the connection string
                return ExecuteScalar(cn, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="connection">a valid 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>an object containing the value in the 1x1 resultset generated by the command</returns>
        public object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
        public object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //SqlNotice st = new SqlNotice();
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);

            //execute the command & return the results
            object retval = cmd.ExecuteScalar();

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

            //st.End("ExecuteScalar_1", commandText);
            return retval;

        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
        public object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
        public object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //SqlNotice st = new SqlNotice();
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            //execute the command & return the results
            object retval = cmd.ExecuteScalar();

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

            //st.End("ExecuteScalar_2", commandText);
            return retval;
        }

        /// <summary>
        /// 返回ExecuteScalar 只是传入一条sql语句
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <returns></returns>
        public object ExecuteScalar(string commandText)
        {
            return ExecuteScalar(connStr, CommandType.Text, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// 返回ExecuteScalar 可传入参数
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">参数</param>
        /// <returns></returns>
        public object ExecuteScalar(string commandText, params SqlParameter[] commandParameters)
        {
            return ExecuteScalar(connStr, CommandType.Text, commandText, commandParameters);
        }

        /// <summary>
        /// 返回ExecuteScalar 可传入Hashtable参数
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns></returns>
        public object ExecuteScalar(string commandText, Hashtable commandParameters)
        {
            return ExecuteScalar(connStr, CommandType.Text, commandText, MakeAllParam(commandParameters));
        }
        /// <summary>
        ///  返回ExecuteScalar 可传入事务、Hashtable参数
        /// </summary>
        /// <param name="transaction">事务</param>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">Hashtable参数</param>
        /// <returns></returns>
        public object ExecuteScalar(SqlTransaction transaction, string commandText, Hashtable commandParameters)
        {
            return ExecuteScalar(transaction, CommandType.Text, commandText, MakeAllParam(commandParameters));
        }
        /// <summary>
        /// 返回ExecuteScalar 可传入事务、参数
        /// </summary>
        /// <param name="transaction">事务</param>
        /// <param name="commandText">sql语句</param>
        /// <param name="commandParameters">参数</param>
        /// <returns></returns>
        public object ExecuteScalar(SqlTransaction transaction, string commandText, params SqlParameter[] commandParameters)
        {
            return ExecuteScalar(transaction, CommandType.Text, commandText, commandParameters);
        }

        /// <summary>
        /// 执行一个简单的Sqlcommand 没有返回结果
        /// </summary>
        ///  例如:  
        ///  int result = ExecuteScalar(myTran,"delete from test where 1>2 ");  返回 result =0
        /// <param name="transaction">事务名称</param>
        /// <param name="commandText">只能是sql语句</param>
        /// <returns>受影响的行数</returns>
        public object ExecuteScalar(SqlTransaction transaction, string commandText)
        {
            return ExecuteScalar(transaction, CommandType.Text, commandText, (SqlParameter[])null);
        }

        #endregion ExecuteScalar

        #region ExecuteXmlReader

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">a valid SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <returns>an XmlReader containing the resultset generated by the command</returns>
        public XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
        }



        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an XmlReader containing the resultset generated by the command</returns>
        public XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            XmlReader retval = cmd.ExecuteXmlReader();

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

        }


        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <returns>an XmlReader containing the resultset generated by the command</returns>
        public XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid SqlTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an XmlReader containing the resultset generated by the command</returns>
        public XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            XmlReader retval = cmd.ExecuteXmlReader();

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

        }

        #endregion ExecuteXmlReader

        /// <summary>
        /// 存储过程可以使用事务
        /// </summary>
        /// <param name="commandType"></param>
        /// <param name="commandText"></param>
        /// <param name="IsTrans"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public int ExecuteNonQuery(CommandType commandType, string commandText, string IsTrans, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            PrepareCommand(commandType, commandText, IsTrans, commandParameters);

            //finally, execute the command.
            int retval = sqlCmd.ExecuteNonQuery();

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

            return retval;
        }

        private void PrepareCommand(CommandType commandType, string commandText, string IsTrans, SqlParameter[] commandParameters)
        {
            //if the provided connection is not open, we will open it

            if (sqlConn.State != ConnectionState.Open)
            {
                sqlConn.Open();
            }

            if (IsTrans == "1")
            {
                if (sqlCmd == null)
                {
                    sqlCmd = new SqlCommand();
                    sqlCmd.Connection = sqlConn;
                    sqlCmd.CommandTimeout = 10000;
                }
                //set the command text (stored procedure name or SQL statement)
                sqlCmd.CommandText = commandText;

                //set the command type
                sqlCmd.CommandType = commandType;

                //attach the command parameters if they are provided
                if (commandParameters != null)
                {
                    AttachParameters(sqlCmd, commandParameters);
                }

            }
            return;
        }

        #region  Ys SQL获取执行结果 

        /// <summary>
        /// 增、删、改的方法[ExecuteNonQuery] 返回所影响的行数，执行其他
        /// </summary>
        /// <param name="sql">Sql命令</param>
        /// <param name="cmdtype">SQL语句（CommandType.Text）或者存储过程(CommandType.StoredProcedure)</param>
        /// <param name="pms"></param>
        /// <returns></returns>
        public  int GetExecuteNonQuery(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            int i = -1;
            try
            {
                using (SqlConnection con = new SqlConnection(connStr))
                {
                    using (SqlCommand cmd = new SqlCommand(sql, con))
                    {
                        //存储过程或者Sql语句
                        cmd.CommandType = cmdtype;
                        if (pms != null)
                        {
                            cmd.Parameters.AddRange(pms);
                        }
                        if (con.State != ConnectionState.Open)
                        {
                            con.Open();
                        }
                        i = cmd.ExecuteNonQuery();
                    }
                }
            }
            catch (Exception)
            {
                throw;
            }

            return i;
        }

        /// <summary>
        /// 执行查询、查询多少条数据；返回第一行，第一列方法[ExecuteScalar] 返回-1执行失败 
        /// </summary>
        /// <param name="sql">Sql命令</param>
        /// <param name="cmdtype">SQL语句（CommandType.Text）或者存储过程(CommandType.StoredProcedure)</param>
        /// <param name="pms"></param>
        /// <returns></returns>
        public  object GetExecuteScalar(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            try
            {
                SqlConnection con = new SqlConnection(connStr);
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    //存储过程或者Sql语句
                    cmd.CommandType = cmdtype;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    if (con.State != ConnectionState.Open)
                    {
                        con.Open();
                    }
                    return cmd.ExecuteScalar();
                }
            }
            catch (Exception)
            {
                throw;
            }
        }

        /// <summary>
        /// 执行查询，返回多行、多列的方法ExecuteReader()
        /// </summary>
        /// <param name="sql">Sql命令</param>
        /// <param name="cmdtype">SQL语句（CommandType.Text）或者存储过程(CommandType.StoredProcedure)</param>
        /// <param name="pms"></param>
        /// <returns></returns>
        public  SqlDataReader GetExecuteReader(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            SqlConnection con = new SqlConnection(connStr);

            using (SqlCommand cmd = new SqlCommand(sql, con))
            {
                //cmd.CommandTimeout = 60000000;
                //存储过程或者Sql语句
                cmd.CommandType = cmdtype;
                if (pms != null)
                {
                    cmd.Parameters.AddRange(pms);
                }

                try
                {
                    if (con.State != ConnectionState.Open)
                    {
                        con.Open();
                    }
                    return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
                }
                catch
                {
                    con.Close();
                    con.Dispose();
                    throw;
                }
            }
        }

        /// <summary>
        /// 执行返回多个查询时使用,返回DataTable类型
        /// </summary>
        /// <param name="sql">Sql命令</param>
        /// <param name="cmdtype">SQL语句（CommandType.Text）或者存储过程(CommandType.StoredProcedure)</param>
        /// <param name="pms">参数</param>
        /// <returns></returns>
        public  DataTable GetExecuteDataTable(string sql, CommandType cmdtype, params SqlParameter[] pms)
        {
            DataTable dt = new DataTable();
            try
            {
                //通过adapter读取数据。
                using (SqlDataAdapter adapter = new SqlDataAdapter(sql, connStr))
                {
                    adapter.SelectCommand.CommandType = cmdtype;
                    if (pms != null)
                    {
                        adapter.SelectCommand.Parameters.AddRange(pms);
                    }

                    adapter.Fill(dt);
                    return dt;
                }
            }
            catch (Exception)
            {
                throw;
            }
        }

        /// <summary>  
        /// 该方法是一个数据集方法在很多地方用得到的　  
        /// </summary>  
        /// <param name="sql">第一个参数是传sql语句</param>  
        /// <param name="table">第二个参数是传数据库当中的表名</param>  
        /// <returns></returns>  
        public  DataSet GetGetDataSet(string sql, CommandType cmdtype, string table)
        {
            try
            {
                using (SqlDataAdapter adapter = new SqlDataAdapter(sql, connStr))
                {
                    adapter.SelectCommand.CommandType = cmdtype;
                    DataSet ds = new DataSet();
                    adapter.Fill(ds, table);
                    return ds;
                }
            }
            catch (Exception)
            {
                throw;
            }
        }

        /// <summary>
        /// 连接数据
        /// </summary>
        /// <param name="constring"></param>
        /// <returns></returns>
        public  bool GetOpen(string constring = null)
        {
            if (constring == null)
            {
                constring = connStr;
            }
            SqlConnection con = new SqlConnection(constring);
            try
            {
                if (con.State != ConnectionState.Open)
                {
                    con.Open();
                }
                if (con.State == ConnectionState.Open)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch
            {
                con.Close();
                con.Dispose();
                return false;
            }
        }
        #endregion
    }