MySQL 触发 IF 条件

Question

我想在插入另一个表时填充表中的一些列值，并为特定列设置条件。我使用触发器:

CREATE TRIGGER inserttrigger AFTER INSERT ON table1 FOR EACH ROW INSERT INTO table2 SET col1 = NEW.col1, col2 = NEW.col2;  IF LENGTH(NEW.col3) > 20 THEN SET col3 = NEW.col3 END IF;

我在 IF 条件附近遇到语法错误:

ERROR 1064 (42000): 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 'END IF' at line 1

Answer 1

delimiter |
CREATE TRIGGER inserttrigger AFTER INSERT ON table1 
FOR EACH ROW 
BEGIN
   INSERT INTO table2 
   SET col1 = NEW.col1, 
       col2 = NEW.col2,
       col3 = case when LENGTH(NEW.col3) > 20 
                   then NEW.col3
              end;
END
|
delimiter ;