Question

我想知道我是否可以使用MySQL IF来选择要更新的表。我正在尝试这样的事情：

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

:listId可以是字符串global或数字。当：listId是数字时，我想更新表profanity，否则，我想更新accountProfanity。当我运行此查询时，我得到了这个结果：

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

还有其他办法吗？

Answer 1

您可以使用预准备语句：

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;

mysql if语句确定表

1 个答案: