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我有一个这样的触发器:(基本上更新表 1 中的列,我更新表 2 中的列)

CREATE OR REPLACE TRIGGER AAA   AFTER UPDATE 
   ON TABLE_1    REFERENCING NEW AS NEWROW OLD AS OLDROW
   FOR EACH ROW
WHEN (
NEWROW.DELETED ='Y' AND NEWROW.ID IN (41,43)
AND OLDROW.DELETED = 'N'
      )
DECLARE
id_1 number;
id_2 number;
id_3 number;
BEGIN

select id_1, id_2,id_3 into id_1,id_2,id_3  from  table_1 where id_1 = :NEWROW.id1 and id2 = some_other_row.id2;
if id_1 is  null
then

 update table2 set deleted = 'Y' ,   where table2.id_1 = id_1 and table2.id_2=id_2 and table2.id_3 = id_3;

   end if;

EXCEPTION
   WHEN OTHERS
   THEN
      -- Consider logging the error and then re-raise
      RAISE;
END AAA;
/

当我更新 table1 我得到:

ORA-04091: table table1 is mutating, trigger/function may not see it 

我认为仅当您更新触发器试图更新某些内容的表时才会发生此错误。但是在这里我正在更新table1,并且触发器应该更新table2。那么为什么是错误?

4

1 回答 1

1

这是导致这里问题的 SELECT 语句。在触发器内部,您不能从同一个表中选择。在您的示例中,您不需要/不能使用 SELECT 语句。您可以通过简单地使用:newrow.id_1,:newrow.id_2和来获取值:newrow.id_3

于 2013-05-29T08:10:21.820 回答