這個MySQL查詢有什麼問題。它提供了無效的參數個數錯誤

Question

MySQL允許這個錯誤：

SQLSTATE[HY093]: Invalid parameter number 

此查詢：

public function getUserFriends($userId) { 
    $query = "SELECT users.id, users.firstName, users.lastName, users.thumbPic FROM friendships LEFT JOIN users ON ((friendships.user1 = users.id OR friendships.user2 = users.id) AND users.id <> :userId) WHERE (user1 = :userId OR user2 = :userId) AND friendships.status = 1"; 
    return $this->adapter->prepare($query)->execute(array(':userId' => $userId))->fetchAll(); 
} 

參數號看起來不錯我還是我失去了一些東西？

Answer 1

不幸的是，你不能使用兩次相同的命名參數。你必須這樣完成你的目標：（我知道...跛腳，對嗎？）

public function getUserFriends($userId) { 
    $query = " 
     SELECT 
      users.id, users.firstName, users.lastName, users.thumbPic 
     FROM 
      friendships 
     LEFT JOIN 
      users ON 
       (friendships.user1 = users.id OR friendships.user2 = users.id) 
       AND users.id <> :userIdA 
     WHERE 
      (user1 = :userIdB OR user2 = :userIdC) 
      AND friendships.status = 1"; 
    return $this->adapter->prepare($query)->execute(array(
     ':userIdA' => $userId 
     ':userIdB' => $userId 
     ':userIdC' => $userId 
    ))->fetchAll(); 
}