通过sql语句“从tableName删除”删除多行，而TRIGGER“删除后”已应用于该行答案

【问题标题】：Delete multiple rows by sql statement "delete from tableName" whereas TRIGGER "After Delete" had applied on that通过sql语句“从tableName删除”删除多行，而TRIGGER“删除后”已应用于该行
【发布时间】：2013-07-25 11:09:48
【问题描述】：

我在一张表上应用了“删除后”触发器，下面是脚本：

ALTER TRIGGER [dbo].[onDelete_N_UR]
   ON  [dbo].[Notification_UnRead]
   AFTER delete
AS 
BEGIN


SET NOCOUNT ON;

declare @roid int 
set @roid=(select ReachOutID from deleted(nolock) 
where  deleted.NotificaionType='reachoutlike')


update CACHE_Reachout 
set CACHE_Reachout.LIKEcount=(select [dbo].[getReachout_Notification_Count](@roid,'like') ) 
where CACHE_Reachout.ReachOutID=@roid

结束

现在我正在尝试使用以下 sql 语句批量删除一些行：

delete from  Notification_UnRead where Notification_ID=****

它给了我错误

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression."

当应用删除触发器时，如何使用上述删除语句删除多行。

【问题讨论】：

那个错误信息非常明确。
您的删除查询似乎没有使用子查询，除非那些 **** 转换为子查询而不是静态值。您需要在此处发布触发器的完整 SQL 以获得任何帮助。

标签： sql-server triggers sql-delete

【解决方案1】：

试试这个 -

ALTER TRIGGER [dbo].[onDelete_N_UR]
  ON [dbo].[Notification_UnRead]
  AFTER DELETE
AS BEGIN


     SET NOCOUNT ON;

     DECLARE @roid INT
     SET @roid =
     (
          SELECT TOP 1 ReachOutID
          FROM DELETED d
          WHERE d.NotificaionType = 'reachoutlike'
     )


     UPDATE CACHE_Reachout
     SET CACHE_Reachout.LIKEcount = dbo.getReachout_Notification_Count(@roid, 'like')
     WHERE CACHE_Reachout.ReachOutID = @roid

END

或者试试这个（更适合使用）-

ALTER TRIGGER [dbo].[onDelete_N_UR]
  ON [dbo].[Notification_UnRead]
  AFTER DELETE
AS BEGIN

     SET NOCOUNT ON;

     UPDATE t
     SET LIKEcount = dbo.getReachout_Notification_Count(d.ReachOutID, 'like')
     FROM CACHE_Reachout t
     JOIN DELETED d ON t.ReachOutID = d.ReachOutID
     WHERE d.NotificaionType = 'reachoutlike'

END

【讨论】：

【解决方案2】：

要么

set @roid=(select ReachOutID from deleted(nolock) 
where  deleted.NotificaionType='reachoutlike')

或者

    set CACHE_Reachout.LIKEcount=
    (select [dbo].[getReachout_Notification_Count](@roid,'like') ) 
    where CACHE_Reachout.ReachOutID=@roid

正在返回多于 1 行的数据。

拉吉

【讨论】：

【解决方案3】：

ALTER TRIGGER [dbo].[onDelete_N_UR]
ON [dbo].[Notification_UnRead]
AFTER DELETE
AS
BEGIN

     SET NOCOUNT ON;

     DECLARE @roid INT
     SET @roid =
     (
          SELECT TOP 1 ReachOutID
          FROM DELETED(nolock)
          WHERE DELETED.NotificaionType = 'reachoutlike'
     )


     UPDATE CACHE_Reachout
     SET CACHE_Reachout.LIKEcount =
     (
          SELECT [dbo].[getReachout_Notification_Count](@roid, 'like')
     )
     WHERE CACHE_Reachout.ReachOutID = @roid

END

【讨论】：

虽然这会消除错误，但它并不能解决逻辑问题（除非具有相同Notification_ID 的每一行都具有相同的ReachOutID） - 您正在选择一个任意 ReachOutID 来自deleted，并忽略所有其他也被删除的内容。您需要编写代码，尊重 deleted 是一个包含多个行的伪表。

【解决方案4】：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER TRIGGER [dbo].[onDelete_N_UR]
   ON  [dbo].[Notification_UnRead]
   AFTER delete
AS 
BEGIN


    SET NOCOUNT ON;

    declare @roid int 

    CREATE TABLE #TempTable (ReachOutID INT)

    INSERT INTO #TempTable (ReachOutID)
    select ReachOutID from deleted(nolock) where deleted.NotificaionType='reachoutlike'




DECLARE @getAccountID CURSOR
SET @getAccountID = CURSOR FOR
SELECT ReachOutID
FROM #TempTable
OPEN @getAccountID
FETCH NEXT
FROM @getAccountID INTO @roid
WHILE @@FETCH_STATUS = 0
BEGIN

update CACHE_Reachout set CACHE_Reachout.LIKEcount=(select [dbo].[getReachout_Notification_Count](@roid,'like') ) where CACHE_Reachout.ReachOutID=@roid



FETCH NEXT
FROM @getAccountID INTO @roid
END
CLOSE @getAccountID
DEALLOCATE @getAccountID

    drop table #TempTable
END

【讨论】：