Question

目前我们在tbl_number上有一个触发器。如下，

create or replace TRIGGER TRIGGER_EXAMPLE
BEFORE DELETE
ON TBL_NUMBER
FOR EACH ROW
BEGIN


-- Insert record into TBL_NUMBER _DUMMY table
INSERT INTO TBL_NUMBER _DUMMY
 ( NAME, NO_OF_PEOPLE)
  VALUES
 ( :old.NAME, :old.NO_OF_PEOPLE)
 END;

现在我们要修改触发器并在原始表tbl_number中检查值NO_OF_People 如果是（-1），我们想在表tbl_number_dummy的NO_of_People列中放入0（或null）。

任何有关它的指示都将不胜感激。

谢谢， -Adi

Answer 1

INSERT INTO TBL_NUMBER_DUMMY
 ( NAME, NO_OF_PEOPLE)
  VALUES
 ( :old.NAME, decode(:old.NO_OF_PEOPLE, -1, 0, :old.NO_OF_PEOPLE)
 END;

或者，如果您想仅在NO_OF_PEOPLE = -1时插入TBL_NUMBER _DUMMY，

CASE WHEN :old.NO_OF_PEOPLE = -1 THEN
INSERT INTO TBL_NUMBER _DUMMY
 ( NAME, NO_OF_PEOPLE)
  VALUES
 ( :old.NAME, :old.NO_OF_PEOPLE)
ELSE null;
END;

更新（对评论的回应）：

INSERT INTO TBL_NUMBER_DUMMY
 ( NAME, NO_OF_PEOPLE)
  VALUES
 ( :old.NAME, case when :old.NO_OF_PEOPLE < 0 then 0; else :old.NO_OF_PEOPLE; end)
 END;

或者，带解码

INSERT INTO TBL_NUMBER_DUMMY
 ( NAME, NO_OF_PEOPLE)
  VALUES
 ( :old.NAME, decode(sign(:old.NO_OF_PEOPLE), -1, 0, :old.NO_OF_PEOPLE)
 END;

：）

是的，你可以在数字列中插入null，除了列有NOT NULL的情况。约束

在删除oracle触发器之前检查值，然后插入另一个表中

1 个答案: