如何刪除觸發器後處理時，從表中

Question

刪除多行我有兩個表，表中的一個bcdet具有交易細節和表中的兩個accmast擁有所有分類賬戶的期末餘額。當我試圖刪除任何事務時，更新不起作用。

這裏是我的觸發代碼。

ALTER trigger [dbo].[tr_ledgerdelete] 
on [dbo].[BCDet] 
after delete 
as 
begin 
    declare @dlcode int; 
    declare @ddc nvarchar(2); 
    declare @dAmt float; 

    SET NOCOUNT ON;  

    set @ddc=(select dc from deleted) 
    set @damt=(select amt from deleted) 
    if (@ddc='C') 
    begin 
     update accmast set totcr=totcr-@damt where Lcode in (select Lcode from deleted) 
     update accmast set clbal=totcr-totdr+opbal where Lcode in (select Lcode from deleted) 
    end 

    else 

    begin 
     update accmast set totdr=totdr-@damt where Lcode in (select Lcode from deleted) 
     update accmast set clbal=totcr-totdr+opbal where Lcode in (select Lcode from deleted) 
    end 

end 

Answer 1

插入和刪除的表可以包含多行，因此不建議在觸發器中使用變量。

另外，如果Lcode不是唯一的被刪除的事務，使用它作爲where謂詞可以允許你的更新在太多行上觸發。

不知道架構很難說。這個例子應該克服第一個問題。

ALTER trigger [dbo].[tr_ledgerdelete] 
on [dbo].[BCDet] 
after delete 
as 
begin 
    SET NOCOUNT ON;  

    update t 
    set totcr = t.totcr - d.amt 
    from accmast t 
    inner join deleted d on t.lcode = d.lcode 
    where d.dc='C' 

    update t 
    set totdr = t.totdr - d.amt 
    from accmast t 
    inner join deleted d on t.lcode = d.lcode 
    where d.dc != 'C' 

    update t 
    set clbal = t.totcr - t.totdr + t.opbal 
    from accmast t 
    inner join deleted d on t.lcode = d.lcode 

end