Mysql if語句來確定表

Question

我想知道如果我可以使用MySQL IF來選擇要更新的表。我想是這樣的：

UPDATE IF(:listId = 'global', `profanity`,`accountProfanity`) SET `active` = IF(`active` = 1,0,1) WHERE `id` = 1 

:listId能奔字符串global或數字。 何時：listId是數字，我想更新表profanity，否則，我想更新accountProfanity。 當我運行此查詢我得到這個結果：

SQLSTATE[42000]: Syntax error or access violation: 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 'IF('global' = 'global', `profanity`,`accountProfanity`) SET `active` = IF(`activ' at line 1 

是否有另一種方式做到這一點？

Answer 1

您可以使用事先準備好的聲明此：

SET @id = 1;  
SET @table_name = IF(:listId = 'global', `profanity`,`accountProfanity`); 
SET @update_query = CONCAT('UPDATE ', @table_name, ' 
           SET active = IF(active = 1,0,1) 
           WHERE id = ', @id); 
PREPARE stmt FROM @update_query; 
EXECUTE stmt; 
DEALLOCATE PREPARE stmt;