问题
So I have table foo and I would like to delete other foo rows when trigger t_foo fires:
CREATE OR REPLACE TRIGGER "t_foo" AFTER INSERT OR DELETE OR UPDATE ON foo
/*delete some other records from foo that are not :NEW.* or :OLD.* \*
How would I go about doing this without getting a ORA-04091: table name is mutating, trigger/function may not see it. Is this even possible?
回答1:
Why not do this in a stored procedure, where you can wrap the insert and deletes in a transaction, and can clearly document this side-effect behavior?
回答2:
See Tom Kyte's definitive article on this topic.
回答3:
This basically implies you have interdependent rows in your table, possibly a hierarchical structure with a self-reference from a column to the primary key. Did you think about ON DELETE CASCADE?
来源：https://stackoverflow.com/questions/4367089/ora-04091-how-can-i-alter-a-table-that-a-trigger-fires-on