CREATE TRIGGER trigger_name {BEFORE | AFTER | INSTEAD OF} triggering_event ON table_name [FOR EACH ROW] | [FOR EACH STATEMENT] trigger_body; 1. 2. 3. 4. 其中: CREATE TRIGGER表示创建一个触发器,trigger_name是触发的名称; BEFORE、AFTER、分别表示触发的时机,INSTEAD OF表示替代触发器; triggerin...
show triggers; 1. 其中,Trigger表示触发器名称;Event表示触发动作;Table表示在哪张表中进行触发动作后执行触发器;Statement表示触发器激活后执行什么动作;Timing表示触发器执行的时间是在event之before还是after 通过系统表查看触发器 格式: use information_schema; //数据库连接到information_schema select * from trig...
A.5.3. Does MySQL 5.7 have statement-level or row-level triggers? In MySQL 5.7, all triggers are FOR EACH ROW; that is, the trigger is activated for each row that is inserted, updated, or deleted. MySQL 5.7 does not support triggers using FOR EACH STATEMENT. 分类: Mysql 好文要顶...
1.MYSQL 不支持语句触发(for each statement),只支持行触发(for each row,新旧数据通过关键字new和old区别) 实验: 数据库存储和触发器实验 一、实验目的 理解,实现并逐渐熟悉存储过程的使用 存储过程(Stored Procedure)是指一组可编程的函数,是为了完成特定功能的SQL语句集,经编译创建并保存在数据库中,用户可通过...
A.5.3. Does MySQL have statement-level or row-level triggers? All triggers are FOR EACH ROW; that is, the trigger is activated for each row that is inserted, updated, or deleted. MySQL does not support triggers using FOR EACH STATEMENT. A.5.4. Are there any default triggers? Not...
(1)Trigger表示触发器的名称,这里有两个触发器分别是tri_student和trigger_student (2)Event表示激活触发器的事件,这里的两个触发事件为插入操作INSERT (3)Table表示激活触发器的操作对象表,这里都为student表 (4)Statement表示激活触发器之后执行的语句
Show triggers; 查看某个触发器的内容: SHOW CREATE TRIGGER trigger_name; 然后把SQL Original Statement列的内容复制粘贴出来即可。 删除触发器: Drop trigger trigger_name; 修改触发器: 无,先删除,再新建。 04 NEW和OLD的使用 MySQL 中定义了 NEW 和 OLD加列名,用来表示触发器所在表中,触发了触发器的那一行...
以下是MariaDB中create trigger的语法:MySQL不支持or replace和if not exists子句。 CREATE [OR REPLACE] TRIGGER [IF NOT EXISTS] trigger_name { BEFORE | AFTER } { INSERT | UPDATE | DELETE } ON tbl_name FOR EACH ROW trigger_body 触发器只能建立在永久表上,不能建立在视图和临时表上。MySQL/Maria...
CREATE TRIGGER trigger_name trigger_time trigger_event ON tbl_name FOR EACH ROW trigger_stmt trigger_name: 触发器名称,用户自行指定 trigger_time: 触发时机,取值BEFORE(之前)、AFTER(之后) trigger_event: 出发事件,INSERT、UPDATE、DELETE。(插入、更新、删除) ...
15.1.22 CREATE TRIGGER Statement CREATE [DEFINER = user] TRIGGER [IF NOT EXISTS] trigger_name trigger_time trigger_event ON tbl_name FOR EACH ROW [trigger_order] trigger_body trigger_time: { BEFORE | AFTER } trigger_event: { INSERT | UPDATE | DELETE } trigger_order: { FOLLOWS | ...