Question

我有这个功能并且它一直发出错误“致命错误：未捕获异常'PDOException'，消息'SQLSTATE [HY000]：常规错误'in ...”错误指示我行“$ row” = $ q2-＆gt; fetchAll（PDO :: FETCH_OBJ）;“。我搜索吨以寻求解决方案，但无济于事。我的代码看起来与php docs中给出的示例格式相同......

这是根据TML的建议更新的功能：

//gets a record by id and sets object properties to it's values
function getById($sid) {
    global $conf, $pdo;
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    //checks to see if a record exists for the given id
    try {
        $stmt  = $pdo->prepare('Use ' . $conf['database'] . '; select mem_id as "_id", mem_name as "_name", mem_info as "_info",
                                mem_password as "_password", mem_email as "_email", mem_image as "_image",
                                mem_group as "_group"
                                from ' . $conf['prefix'] . 'members
                                where mem_id = ?;');
        echo"85 <br />";
        $stmt->execute(array($sid));
        echo"86 <br />";
        $rows = $stmt->fetchAll(PDO::FETCH_OBJ);
        echo"90 <br />";
        print_r($rows);
        if (count($rows) !== 1) {
            throw new Exception("Some exception here");
        }
        foreach($rows[0] as $field=>$value) {
            $this->$field = $value;
            echo"97 <br />";
        }
    } catch (PDOException $e) {
        echo"something went wrong! " . var_dump($e);
    }
}

var_dump输出：

object(PDOException)[4]
  protected 'message' => string 'SQLSTATE[HY000]: General error' (length=30)
  private 'string' (Exception) => string '' (length=0)
  protected 'code' => string 'HY000' (length=5)
  protected 'file' => string 'D:\wamp\www\testing\scripts\Kantan\classes\Member.php' (length=53)
  protected 'line' => int 86
  private 'trace' (Exception) => 
    array (size=2)
      0 => 
        array (size=6)
          'file' => string 'D:\wamp\www\testing\scripts\Kantan\classes\Member.php' (length=53)
          'line' => int 86
          'function' => string 'fetchAll' (length=8)
          'class' => string 'PDOStatement' (length=12)
          'type' => string '->' (length=2)
          'args' => 
            array (size=1)
              ...
      1 => 
        array (size=6)
          'file' => string 'D:\wamp\www\testing\scripts\Kantan\test.php' (length=43)
          'line' => int 5
          'function' => string 'getById' (length=7)
          'class' => string 'Member' (length=6)
          'type' => string '->' (length=2)
          'args' => 
            array (size=1)
              ...
  private 'previous' (Exception) => null
  public 'errorInfo' => 
    array (size=1)
      0 => string 'HY000' (length=5)
  public 'xdebug_message' => string '<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> PDOException: SQLSTATE[HY000]: General error in D:\wamp\www\testing\scripts\Kantan\classes\Member.php on line <i>86</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeee'... (length=1472)

提前感谢您的帮助。

Answer 1

编写上述代码的更好方法 - 以及可能解决问题的代码 - 可能看起来像这样：

//gets a record by id and sets object properties to it's values
function getById($sid) {
    global $conf, $pdo;
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    //checks to see if a record exists for the given id
    try {
        $stmt  = $pdo->prepare('select mem_id as "_id", mem_name as "_name", mem_info as "_info",
                                mem_password as "_password", mem_email as "_email", mem_image as "_image",
                                mem_group aS "_group"
                                from members
                                where mem_id = ?');
        $stmt->execute(array($sid));

        $rows = $stmt->fetchAll(PDO::FETCH_OBJ);
        if (count($rows) !== 1) {
            throw new Exception("Some exception here");
        }
        foreach($rows[0] as $field=>$value) {
            $this->$field = $value;
        }
    } catch (PDOException $e) {
        /* handle errors in useful way, don't just die() */
    }
}

需要注意的一些差异：

两次查询数据库似乎没有任何合理的理由。
上面的代码忽略了在PDO中使用预准备语句的主要好处之一 - 即查询的参数化。
“或die（）”留下了糟糕的用户体验 - 更优雅地处理错误。我在这里的例子中使用了异常处理，但这当然不是唯一的方法;由于你的setAttribute调用，我只是违约了。
虽然我在这里完整地保留了你的全局变量，你应该考虑放弃使用'全局'，因为它通常被认为是非常糟糕的做法。谷歌的一些工作应该发表任何数量的讨论原因的文章，但德米特法则是一个很好的起点。
所有这些'USE'电话都没有理由; PDO对象已经为您提供了这些信息。

Freenode ## PHP的成员为PDO编制了一个tutorial，您可能希望在进一步推进之前检查它。

致命错误：未捕获异常'PDOException'，消息'SQLSTATE [HY000]：常规错误'中

1 个答案: