在PHP中PDO調用失敗，但在MySQL Workbench中成功執行

Question

我通過PDO連接到MySQL數據庫，但是當我嘗試在PHP中執行SQL調用時，它失敗，並顯示下面的錯誤。當我回顯SQL並在MySQL Workbench中運行它時，它將返回到我期望的結果。這是$prepared->errorInfo()輸出時失敗：

Array (
    [0] => 42000 
    [1] => 1064 
    [2] => 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 "5" at line 17 
) 

所以它看起來像什麼是錯用事先準備好的聲明，並在execute值傳遞給它，但我不知道是什麼。除了告訴我同樣的問題，http://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html#error_er_parse_error並沒有真正的幫助。

function __construct($params = array()) { 

    $DB = new PDO('mysql:host='.$config['host'].';port='.$config['port'].';dbname='.$config['name'], $config['user'], $config['pswd']); 
    if (!$DB) { 
     throw new Exception('Could not connect to database'); 
    } 

    $type = $params['topic']; 

    if (isset($params['topic']) && $params['topic'] !== '') { 
     $typeSlugSql = "SELECT id from topics WHERE slug = ? LIMIT 1"; 

     $prepared = $DB->prepare($topicSlugSql); 
     $list = $prepared->execute(array($params['topic'])); //NOTE: this is working correctly and returns the ID I expect 
     if (!$list) { 
      throw new Exception('topic slug execute failed'); 
     } 
     $row = $prepared->fetch(PDO::FETCH_ASSOC); 

     $topic = $row['id']; //id is correctly 6 at this point 
    } 

    //generate SQL query 
    $sql = "SELECT 
       articles.id AS id, 
       articles.slug AS slug, 
       articles.title AS title, 
       articles.headline AS headline, 
       articles.description AS description, 
       articles.keywords AS keywords, 
       articles.content AS content, 
       DATE(articles.published_date) AS date, 
       articles.created AS created 
      FROM 
       articles articles 
      WHERE 
       articles.published_date <= CURRENT_TIMESTAMP 
       AND (articles.published IS NOT NULL OR articles.published = 1) 
      ORDER BY 
       articles.published_date DESC LIMIT 0 , ?"; 

    //run the query and get the feed data 
    $prepared = $DB->prepare($sql); 
    $items = $prepared->execute(array(5)); //this will make the SQL fail... 

    echo $sql; 

    if (!$items) { 
     print_r($DB->errorInfo()); //this prints the 'errorInfo' listed above 
     throw new Exception('execution error...'); 
    } 

    $options = array('ellipsis' => '...', 'exact' => false, 'html' => false); 
    while ($row = $prepared->fetch(PDO::FETCH_ASSOC)) { 
     array_push($this->resources, new Resource($row['title'], $row['slug'], $row['date'], $this->cleanAndTruncate($row['content']))); 
    } 

} 

最奇怪的部分是$prepared->execute(array($params['type']))工作正常，並返回我期待的ID。再一次，如果我複製/粘貼echo'd SQL並將其替換爲?和5，則它在MySQL Workbench中按預期工作。如果我做的：

$sql = "SELECT 
       articles.id AS id, 
       articles.slug AS slug, 
       articles.title AS title, 
       articles.headline AS headline, 
       articles.description AS description, 
       articles.keywords AS keywords, 
       articles.content AS content, 
       DATE(articles.published_date) AS date, 
       articles.created AS created 
      FROM 
       articles articles 
      WHERE 
       articles.published_date <= CURRENT_TIMESTAMP 
       AND (articles.published IS NOT NULL OR articles.published = 1) 
      ORDER BY 
       articles.published_date DESC LIMIT 0 , 5"; 

    $prepared = $DB->prepare($sql); 
    $items = $prepared->execute(); 

它工作在PDO和MySQL工作臺，但我需要的LIMIT取決於傳遞的參數更改爲搞清楚什麼是打破這個有什麼建議？

Answer 1

試試這個：

$sql = "SELECT 
      articles.id AS id, 
      articles.slug AS slug, 
      articles.title AS title, 
      articles.headline AS headline, 
      articles.description AS description, 
      articles.keywords AS keywords, 
      articles.content AS content, 
      DATE(articles.published_date) AS date, 
      articles.created AS created 
     FROM 
      articles articles 
     WHERE 
      articles.published_date <= CURRENT_TIMESTAMP 
      AND (articles.published IS NOT NULL OR articles.published = 1) 
     ORDER BY 
      articles.published_date DESC LIMIT :limit , 5"; 

$stmt = $DB->prepare($sql); 

$limit = 5; 

$stmt->bindParam(':limit', $limit, PDO::PARAM_INT); 

$items = $stmt->execute();