Question

我正在研究连接到SQL数据库的asp.net C＃项目（MySQL 2008）。这是我的C＃类：

 public static DataTable GetUnitByName(string unit)
    {
        Database db = DatabaseFactory.CreateDatabase();
        string sqlCommand = "GetUnitByName";
        DbCommand dbCommandWrapper = db.GetStoredProcCommand(sqlCommand);
        db.AddInParameter(dbCommandWrapper, "@Unit", DbType.String, unit);
        DataSet ds = db.ExecuteDataSet(dbCommandWrapper);
        DataTable dt = ds.Tables[0];
        return dt;
    }

以下是存储过程：

alter PROCEDURE [dbo].[GetUnitByName]
(
@Unit nvarchar
)
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON
    DECLARE @Err int
    -- Insert statements for procedure here
select * from Unit where Name=@Unit
   SET @Err = @@Error

    RETURN @Err
END

我打电话给这样的程序： DataTable unit1 = Unit.GetUnitByName（per100gText [1] enter code here）; ，per10gText是一个字符串列表。但它返回空数据表。与sql server的连接，在debuging中我看到程序无法读取参数。任何帮助请。

Answer 1

如果你想要proc返回param，你需要先将它声明为输出参数

alter PROCEDURE [dbo].[GetUnitByName]
(
@Unit nvarchar , @err int output
)
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON

    -- Insert statements for procedure here
select * from Unit where Name=@Unit
   SET @Err = @@Error

    RETURN @Err
END

将字符串参数发送到存储过程

1 个答案: