奇怪的mysql，从myAdmin显示0结果集，但返回PHP PDO中的行

Question

我有这个查询，我在phpMyAdmin中运行

SELECT m.msgFrom, m.msgTo, m.msgID, m.subject, m.dateTime, a.username
FROM mailbox m
JOIN accounts a ON ( a.id = IF( m.msgTo =1, m.msgFrom, m.msgTo ) ) 
WHERE msgTo =1
OR msgFrom =1
AND parentID =0
AND IF( m.msgTo =1, m.fromDelete, m.toDelete ) !=1
ORDER BY DATETIME DESC 
LIMIT 250

我得到一个0的行集。

当它与PDO PHP和占位符一起使用时，

$q = $dbc -> prepare("
SELECT m.msgFrom, m.msgTo, m.msgID, m.subject, m.dateTime, a.username 
FROM mailbox m JOIN accounts a ON (a.id = IF(m.msgTo = ?, m.msgFrom, m.msgTo)) 
WHERE msgTo = ? OR msgFrom = ? AND parentID = 0 AND IF(m.msgTo = ?, m.fromDelete, m.toDelete) != 1 
ORDER BY dateTime DESC LIMIT 250");
$q -> execute(array($user['id'], $user['id'], $user['id'], $user['id']));

我得到一个1的行集，其中$user[id'] == 1 。

这里发生了什么，我该如何解决？

Answer 1

并且在mysql中具有比OR更强的绑定

WHERE msgTo =1
OR msgFrom =1
AND parentID =0
AND IF( m.msgTo =1, m.fromDelete, m.toDelete ) !=1

手段

WHERE msgTo =1
OR (msgFrom =1
AND parentID =0
AND IF( m.msgTo =1, m.fromDelete, m.toDelete ) !=1)

PDO可能以另一种方式处理这个问题

尝试

WHERE (msgTo =1
OR msgFrom =1)
AND parentID =0
AND IF( m.msgTo =1, m.fromDelete, m.toDelete ) !=1

在phpmyadmin