这个sql触发器在哪里包含语法错误？

Question

Spent about one hour to understand. Where is this sql trigger contain syntax error?

CREATE
TRIGGER playlis_trubric_count_on_playlist_shared_update
AFTER UPDATE ON playlist_playlist
  FOR EACH ROW
    IF (NEW.shared != OLD.shared) AND (NEW.shared = 1) THEN
        UPDATE etv.playlist_playlistrubric 
            SET count = playlist_playlistrubric.count + 1
        WHERE etv.playlist_playlistrubric.id = NEW.rubric_id;
    ELSEIF (NEW.shared != OLD.shared) AND (NEW.shared = 0) THEN
        UPDATE etv.playlist_playlistrubric
            SET count = playlist_playlistrubric.count - 1
        WHERE etv.playlist_playlistrubric.id = NEW.rubric_id
    END IF;

ERROR SAYS:

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 'ELSEIF (NEW.shared != OLD.shared) AND (NEW.shared = 0) THEN UPDATE etv.p' at line 1

Answer 1

From the documentation :

By using the BEGIN ... END construct, you can define a trigger that executes multiple statements. Within the BEGIN block, you also can use other syntax that is permitted within stored routines such as conditionals and loops. However, just as for stored routines, if you use the mysql program to define a trigger that executes multiple statements, it is necessary to redefine the mysql statement delimiter so that you can use the ; statement delimiter within the trigger definition. The following example illustrates these points. It defines an UPDATE trigger that checks the new value to be used for updating each row, and modifies the value to be within the range from 0 to 100. This must be a BEFORE trigger because the value needs to be checked before it is used to update the row:

 mysql> delimiter // mysql> CREATE TRIGGER upd_check BEFORE UPDATE ON account -> FOR EACH ROW -> BEGIN -> IF NEW.amount < 0 THEN -> SET NEW.amount = 0; -> ELSEIF NEW.amount > 100 THEN -> SET NEW.amount = 100; -> END IF; -> END;// mysql> delimiter ; 

You're missing BEGIN and END and you're also going to need the delimiter trick, because at present your trigger definition ends at the first NEW.rubric_id (which is why the parse error occurs just after that point).