Mysql 中如何创建触发器

use websitelogdb;
#创建表
CREATE TABLE `test` (
  `idtest` int(11) NOT NULL AUTO_INCREMENT,
  `testcol` varchar(45) DEFAULT NULL,
  `testcol1` varchar(45) DEFAULT NULL,
  PRIMARY KEY (`idtest`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;

SELECT * FROM websitelogdb.test;

set @id = 'mysql';
#创建Trigger
DROP TRIGGER IF EXISTS t_afterinsert_on_test;
delimiter |
CREATE TRIGGER t_afterinsert_on_test
AFTER INSERT ON websitelogdb.test
FOR EACH ROW
BEGIN
    set @id = new.idtest;
END;
| delimiter ;

#调用Trigger触发器
insert into websitelogdb.test(testcol, testcol1) values('1','1');
select @id;