sql - Scope_Identity() 总是返回 0

Question

以下存储过程正确插入新行，但始终为输出参数返回 0。什么会返回新的行 ID？

alter procedure DlogErr 
    @Msg varchar(100), @Cmd nvarchar(max), 
    @Stk varchar(200), @Pgm varchar(50), 
    @Lin smallint, @EID int, @UID int output 
as
begin
    set nocount on

    insert into ErrorLog (Src, ErrMsg, Cmd, StackInfo, Itm, Pgm, Lin, ErrID) 
    values ('VFP', @Msg, @Cmd, @Stk, '', @Pgm, @Lin, @EID);

    set @UID = Scope_Identity();
end

Answer 1

很可能您out在调用存储过程时忘记了附加关键字：

declare @varUID int
exec DlogErr @Msg='abc', @Cmd = 'foo', @Stk ='', @Pgm = '', @Lin = 0, @EID = 0 , @UID =  @varUID out
select @varUID