Question

当从titles_in_stock表中删除行时，我想在名为titles_in_stock_out的表中插入等效行。

我尝试了以下

create trigger titles_in_stock_out
   on titles_in_stock
   after delete as
   begin
      insert into titles_in_stock_out
      (cd_title, invenotry, cd_type)
      values
      (deleted.cd_title, deleted.invenotry, deleted.cd_type)
   end

但是在尝试执行上述语句时会出现以下错误。

Msg 128，Level 15，State 1，Procedure titles_in_stock_out，Line 8
名称＆＃34; deleted.cd_title＆＃34;在这种情况下是不允许的。有效表达式是常量，常量表达式和（在某些情况下）上下文）变量。不允许使用列名。

任何帮助？

由于

Answer 1

您的语法不正确。 deleted是虚拟表，在触发器中可用，然后您必须将其作为表引用。

create trigger titles_in_stock_out
   on titles_in_stock
   after delete as
   begin
      insert into titles_in_stock_out
      (cd_title, invenotry, cd_type)
      select cd_title, invenotry, cd_type
      from deleted
   end

如果您删除了多行，这将非常有用。

Answer 2

您需要将deleted称为表格，并且触发器需要具有不同的名称;在您的示例中，它与表格具有相同的名称。

create trigger titles_in_stock_out_trig
   on titles_in_stock
   after delete as
   begin
      insert into titles_in_stock_out
      (cd_title, invenotry, cd_type)
      select 
      cd_title, invenotry, cd_type
      from deleted
   end

Answer 3

    create trigger titles_in_stock_out
       on titles_in_stock
       FOR  delete 
       begin
   insert into titles_in_stock_out
      (cd_title, invenotry, cd_type)
      select 
      cd_title, invenotry, cd_type
      from deleted
       end

Answer 4

这可以解决您的问题：

IF OBJECT_ID('titles_in_stock_out', 'TR') IS NOT NULL
DROP TRIGGER titles_in_stock_out
GO
CREATE TRIGGER titles_in_stock_out
ON titles_in_stock
FOR DELETE 
AS
BEGIN
      INSERT INTO titles_in_stock_out
      (cd_title, invenotry, cd_type)
      VALUES
      (cd_title, invenotry, cd_type)
      SELECT 
      cd_title, invenotry, cd_type
      FROM titles_in_stock
END

删除后创建触发器

4 个答案: