mysql触发器

DELIMITER $$

DROP TRIGGER `databaseName`.`triggerName`$$

CREATE TRIGGER `databaseName`.`tiggerName` BEFORE/AFTER INSERT/UPDATE/DELETE on `databaseName`.`tableName`
FOR EACH ROW BEGIN

END$$

DELIMITER ;

eg：

DELIMITER $$

DROP TRIGGER `test`.`ttt`$$

create trigger `test`.`ttt` AFTER UPDATE on `test`.`datas`
for each row BEGIN
update chars set counts='5';
END;
$$

DELIMITER ;