sql - 收到错误“函数中包含的选择语句无法将数据返回给客户端”

Question

尝试在函数中使用 Select 语句时收到错误。错误指出：

消息 444，级别 16，状态 2，过程 JDE_GetWhereClause_test，第 26 行
函数中包含的选择语句无法将数据返回到客户端。

有任何想法吗？

CREATE FUNCTION [dbo].[JDE_GetWhereClause_test]
(
@tablename as varchar
)
RETURNS varchar(max)
AS
BEGIN
-- Declare the return variable here
Declare @ResultVar as varchar(max)

-- Add the T-SQL statements to compute the return value here

set @tablename = 'F0101'
Declare @Sql nvarchar(max)
Declare my_cur cursor for
    SELECT fsuser FROM dbo.JDE_ExRowSecurity where fsuser = fsuser;

Declare @fsuser as nchar(15)
open my_cur;
fetch next from my_cur;
while @@fetch_status = 0
   begin
      fetch next from my_cur into @fsuser;    
      set @ResultVar += ',' + @fsuser;
   end;
close my_cur;
deallocate my_cur;

-- Return the result of the function
RETURN @ResultVar
END

Answer 1

尝试玩类似...

CREATE FUNCTION [dbo].[JDE_GetWhereClause_test]
(
@tablename as varchar
)
RETURNS varchar(max)
AS
BEGIN
  -- Declare the return variable here
  Declare @ResultVar as varchar(max)

  -- Add the T-SQL statements to compute the return value here

  set @ResultVar = (select STUFF((SELECT ',', fsuser as [text()]
                    FROM dbo.JDE_ExRowSecurity 
                    FOR XML PATH ('')), 1, 1, '') as blah)

  -- Return the result of the function
  RETURN @ResultVar
END

select 'Answer is: '+[dbo].[JDE_GetWhereClause_test]('whatever')

Answer 2

发现这篇MSDN 文章很有帮助，它解决了我的问题：

RETURN (SELECT GETDATE());

直接从 select 语句返回值，避免变量。