觸發器上的錯誤1054（42S22）

因此，我正在嘗試爲體育應用程序（特別是足球）構建一個Web應用程序。現在，我在記錄比賽得分後應該更新積分的觸發器遇到問題。在這個例子中，我有一個'遊戲'表和一個'積分榜'表，就像這樣。觸發器上的錯誤1054（42S22）

mysql> describe game; 
+-----------------+------------+------+-----+---------+-------+ 
| Field   | Type  | Null | Key | Default | Extra | 
+-----------------+------------+------+-----+---------+-------+ 
| sid    | int(11) | NO | PRI | NULL |  | 
| fid    | int(11) | NO | PRI | NULL |  | 
| lid    | int(11) | NO | PRI | NULL |  | 
| htid   | int(11) | NO | PRI | NULL |  | 
| atid   | int(11) | NO | PRI | NULL |  | 
| date   | date  | NO |  | NULL |  | 
| time   | time  | NO |  | NULL |  | 
| h_g    | int(11) | NO |  | 0  |  | 
| a_g    | int(11) | NO |  | 0  |  | 
| has_been_played | tinyint(1) | NO |  | 0  |  | 
+-----------------+------------+------+-----+---------+-------+ 
10 rows in set (0.00 sec) 

mysql> describe standings; 
+-------+---------+------+-----+---------+-------+ 
| Field | Type | Null | Key | Default | Extra | 
+-------+---------+------+-----+---------+-------+ 
| tid | int(11) | NO | PRI | NULL |  | 
| sid | int(11) | NO | PRI | NULL |  | 
| lid | int(11) | NO | PRI | NULL |  | 
| pld | int(11) | NO |  | 0  |  | 
| pts | int(11) | NO |  | 0  |  | 
| h_w | int(11) | NO |  | 0  |  | 
| h_t | int(11) | NO |  | 0  |  | 
| h_l | int(11) | NO |  | 0  |  | 
| h_gf | int(11) | NO |  | 0  |  | 
| h_ga | int(11) | NO |  | 0  |  | 
| a_w | int(11) | NO |  | 0  |  | 
| a_t | int(11) | NO |  | 0  |  | 
| a_l | int(11) | NO |  | 0  |  | 
| a_gf | int(11) | NO |  | 0  |  | 
| a_ga | int(11) | NO |  | 0  |  | 
+-------+---------+------+-----+---------+-------+ 
15 rows in set (0.00 sec)

其中h/ATID（和TID），FID，SID，並蓋有外鍵組隊，現場，季節和排行榜，分別。

我想在遊戲更新後創建一個觸發器。我在這個應用程序中設計的目前設計是，當插入一個「遊戲」時，它還沒有被「播放」，當它被更新時，記錄得分，然後遊戲被認爲是「播放」。因此，這裏的觸發器的部分：

CREATE TRIGGER `update_standing` AFTER UPDATE ON `game` 
FOR EACH ROW 
BEGIN 
    # If a score has been recorded already, we'll reverse the old score 
    # before updating the new score. 
    IF OLD.has_been_played THEN 
    # The Home Team previously recorded a win 
    IF OLD.h_g > OLD.a_g THEN 
     # Home win 
     UPDATE standings 
     SET pld = pld - 1, 
      h_w = h_w - 1, 
      pts = pts - 3, 
      h_gf = h_gf - OLD.h_g, 
      h_ga = h_ga - OLD.a_g 
     WHERE tid = OLD.htid 
     AND sid = OLD.sid 
     AND lid = OLD.lid; 

     # Away loss 
     UPDATE standings 
     SET pld = pld - 1, 
      a_l = a_l - 1, 
      a_gf = a_gf - OLD.a_g, 
      a_ga = a_ga - OLD.h_g 
     WHERE tid = OLD.atid 
     AND sid = OLD.sid 
     AND lid = OLD.lid; 
    ENDIF; 
    ENDIF; 
END;

出於某種原因，我得到這些錯誤，我不知道爲什麼。

mysql> source new_trigger_myfam.sql 
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 '' at line 18 
ERROR 1054 (42S22): Unknown column 'OLD.atid' in 'where clause' 
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 'ENDIF' at line 1 
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 'ENDIF' at line 1 
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' at line 1

有沒有什麼明顯的錯誤，我的語法？我知道我可以在一個使用case/when/then的情況下執行兩個更新查詢。本質上，在觸發器的這個片段中，我正在顛倒之前的更新，然後實際上有更多的代碼使得更新的其餘部分發生。我對觸發器相當陌生，所以總是感激不盡。

來源

2013-10-11 Alexander W. Poon