{ INSERT | UPDATE | DELETE }:指定触发事件是插入、更新还是删除。 table_name:触发器关联的表名。 trigger_body:触发器触发时要执行的SQL语句。3. 结合IF NOT EXISTS条件,给出完整的SQL语句示例 结合IF NOT EXISTS条件,完整的SQL语句示例如下: sql CREATE TRIGGER IF NOT EXISTS trigger_name AFTER INSERT ON...
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/MariaD...
for insert,update as if not exists(select 1 from deleted) begin /*deleted表无记录,是新增*/ end if not exists(select 1 from inserted) begin /*inserted表无记录,是删除*/ end else begin /*是更新*/ end go eg: create trigger Add_Del_Update on tab1 for insert,update,delete as if not e...
insert/update/deleteon 表名foreach row #行级触发器 Begin trigger_state;end 查看 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Show triggers; 删除 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Drop trigger 数据库.触发器名称; 要求:现有商品表 goods,订单表 orders,当下一个订单时,商品要...
TRIGGER_CATALOG: def TRIGGER_SCHEMA sys TRIGGER_NAME: sys_config__set_user EVENT_MANIPULATION INSERT EVENT_OBJECTCATALOG: def EVENTOBJECT_SCHEMA: sys EVENT_OBJECT_TABLE:sys_config ACTION_ORDER: 1 ACTION_CONDITION: NULL ACTIONSTATEMENT: BEGIN IF sys.ignore_sys_config_triggers = true...
drop trigger if exists trigger_test2; -- 创建触发器trigger_test2 delimiter $$ create trigger trigger_test2 after update on user -- 触发时机:当修改user表数据时触发 for each row -- 每一行 begin insert into user_logs values(NULL,now(), '用户修改发生了修改'); ...
在实例数据表t_a上依次按照下面步骤创建tr_a_insert、tr_a_update、tr_a_delete三个触发器 1、创建INSERT触发器trigger_a_insert: DELIMITER $$ USE `test`$$ --判断数据库中是否存在tr_a_insert触发器 DROP TRIGGER /*!50032 IF EXISTS */ `tr_a_insert`$$ ...
触发器(trigger):监视某种情况,并触发执行某种操作。触发器是在表中数据发生更改时自动触发执行的,它是与表事件相关的特殊的存储过程,它的执行不是由程序调用,也不是手工启动,而是由事件来触发,例如当对一个表进行操作(insert,delete, update)时就会激活它执行。也就是说触发器只执行DML事件(insert、update和delete...
The following trigger : BEGIN IF (NEW.IMHQ_solicitado = 'SI') THEN INSERT INTO imhq (ID_CASO,Tipo_de_estudio,Año,Codigo_interno,Iniciales_Px,Sexo,Edad,n_marcadores_solicitados) VALUES (OLD.ID_CASO, OLD.Tipo_de_estudio, OLD.Año, OLD.Codigo_Interno, OLD.Iniciales_Px, OLD.Sexo,...
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 | ...