Linq to sql存储过程返回值

Question

I have the following stored procedure in an SQL Server 2005 database (meant simply to return the database size in MB).

ALTER PROCEDURE [dbo].[dbSize]
AS
BEGIN
SET NOCOUNT ON;

DECLARE @sizeMb int
DECLARE @DB_NAME varchar(100)

SELECT @DB_NAME = DB_NAME()

SELECT @sizeMb = (size*8)/1024 FROM sys.master_files
    WHERE DB_NAME(database_id) = @DB_NAME
    AND Name = @DB_NAME

RETURN @sizeMb  
END

When I run this in SQL Server Management Studio, it works correctly, returning the current DB Size in MB.

I want this to run inside an application, so I added it to a linq to sql datacontext, which generated the following code:

    [global::System.Data.Linq.Mapping.FunctionAttribute(Name="dbo.dbSize")]
    public int dbSize()
    {
        IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())));
        return ((int)(result.ReturnValue));
    }

I call it like so:

int dbSize = db.dbSize();

However, it only returns zero, never anything else. No exceptions of any kind are thrown either. I experimented with selecting a result and using output parameters, but that didn't help either (the output parameter was zero as well). Any suggestions?

Answer 1

I've run into the same problem. As dumb as it sounds, you have to return a single row with single column containing your value from a stored procedure . L2S doesn't do something akin to ExecuteScalar(...) .

If you use a UDF , you'll have better luck. This post speaks to the problem nicely.