Question

当我尝试通过Trigger删除数据时，它正在删除整个表的数据-不仅是Where子句。

Create TRIGGER trgAfterInsertFDs ON [dbo].MyTable
FOR INSERT,Delete
AS
    declare @id nvarchar(max)
    declare @Status nvarchar(100);

    select @id=i.ID from inserted i;    
    select @Status=i.[Status] from inserted i;  
    Delete from MyTable where ID=@id and [Status]='Closed'
GO

我也尝试过其他方式。要将自动生成的ID从“我的表”转储到另一个表中，并编写了另一个触发器以从“我的表”中删除数据。

Create TRIGGER trgAfterInsert ON [dbo].MyTable
FOR INSERT,Delete
AS
    declare @id nvarchar(max)
    declare @Status nvarchar(100);

    select @id=i.ID from inserted i;    
    select @Status=i.[Status] from inserted i;  
    Delete from MyTable where ID=@id and [Status]='Closed'
        Insert into ClosedID
    Select ID,[Status] from [dbo].MyTable where ID=@id and Status='Closed'
GO

表ClosedID：

Create table ClosedID 
  (ID int,Status nvarchar(max))


Create TRIGGER trgAfter ON ClosedID
FOR INSERT
AS
    declare @ID nvarchar(max)
    declare @Status nvarchar(100);

    select @id=i.ID from inserted i;    
    select @Status=i.Status from inserted i;    
    delete from [dbo].MyTable where id in (Select ID from ClosedID)
    --Delete  from ClosedID
GO

Answer 1

在您的第一个触发器中，您无需出于需要而在DELETE上触发。因为您要针对特定条件进行删除，但是如果已经删除，则无需触发它即可删除。而且您应该考虑使用散装插入物，扳机应将其覆盖。我简化了您的第一个触发器。顺便说一句，如果我想忽略表上的某些插入记录，则我更喜欢 INSTEAD OF INSERT 触发器。

CREATE TRIGGER trgAfterInsertFDs ON [dbo].MyTable
FOR INSERT
AS
    DELETE FROM MyTable 
        WHERE EXISTS (SELECT 1 FROM INSERTED I WHERE MyTable.Id=I.Id AND I.[Status]='Closed')
GO

从邮递员推送数据时，sql触发器不起作用

1 个答案: