SQL 触发器在 MySQL 中给出语法错误

Question

DROP TRIGGER IF EXISTS demo_inc_when_viewstatus_one ;
DELIMITER $$

CREATE  TRIGGER demo_inc_when_viewstatus_one AFTER UPDATE ON `tbl_ffa_demo`
FOR EACH ROW BEGIN
UPDATE  `tbl_stats` SET open_demos=CASE WHEN NEW.demo_status=1  THEN 
 open_demos+1 , 
  total_demos=total_demos+1    WHERE  tbl_stats.area_id=NEW.territory  AND NEW.view_status=1
END $$
DELIMITER;

我收到的错误消息是：

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' total_demos=total_demos+1 WHERE tbl_stats.area_id=NEW.territory AND NE' at line 4

Answer 1

您没有遵循 case 语句的语法：

case when <condition> then <true branch> else <false branch> end

所以，你应该有这样的东西：

...  SET open_demos=CASE WHEN NEW.demo_status=1
     THEN open_demos+1 ELSE open_demos=open_demos END, ...

SQL 触发器在 MySQL 中给出语法错误

SQL trigger giving syntax error in MySQL

mysql

database-trigger