如何让 SQL 触发器在更新时递增 1？

Question

我正在尝试创建一个触发器，在更新时更新特定行上的一列，但出现此错误

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

等我去试扳机的时候

这是我的触发代码：

CREATE OR REPLACE TRIGGER tblTrigger
AFTER UPDATE 
ON employees
FOR EACH ROW
BEGIN
    UPDATE employees 
    SET revisions = revisions + 1 
    WHERE ID = ID;
END;
/

假设只更新某些员工 ID 修订

Answer 1

您需要像这样删除 BEGIN...END：

CREATE TRIGGER tblTrigger AFTER INSERT ON employees

FOR EACH ROW

UPDATE employees SET revisions = revisions + 1 WHERE ID = NEW.ID;

如何让 SQL 触发器在更新时递增 1？

How to get a SQL trigger to increment by 1 on an update?

sql

oracle