发送字符串参数存储过程

Question

我工作的asp.net C＃项目连接到SQL数据库（MySQL的2008）。这里是我的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; 
    } 

，这里是存储过程：

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 

我打电话过程像这样： 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。连接到SQL服务器，在调试我看到该过程无法读取参数。 任何帮助请。如果你想PROC返回您首先需要将其声明为输出参数PARAM

Answer 1

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