导入PDO bindValue / BindParam

Question

我想让我的生活更轻松一点，就像在这篇文章里：

PDO::bindParam in a foreach loop, all values are being set as the same?

还有其他几个..。

我尝试了几个变体来完成我的代码工作(查看消息)，但是没有结果，我必须在类中使用方法：

public function getMessages($locationId, $name) {
    if(!empty($name)) {

        $query = 'SELECT * FROM (SELECT * FROM sms WHERE location_id=:locationId ORDER BY id DESC LIMIT 5) AS SOURCE ORDER BY id ASC';
        $parameters = array(':locationId' => $locationId);

        $row = $this->returnDataObject($query, $parameters);

        while ($row) {
            $this->fetchData($row, $biggestId, $name);
        }

        $this->updateSessionKey($locationId, $name);
    }
}

另一个：

public function returnDataObject($query, $parameters) {
    var_dump($query); 
    var_dump($parameters);

    $dataObject = $this->dbh->prepare($query);

    foreach ($parameters as $key => &$value) {
        $dataObject->bindParam($key, $value);
    }

    $dataObject->execute();
    $row = $dataObject->fetch(PDO::FETCH_OBJ);

    return $row;

}

我试过：

foreach ($parameters as $key => &$value) {
and:
foreach ($parameters as $key => $value) {

我试过：

$dataObject->bindParam($key, $value);
and:
$dataObject->bindValue($key, $value);

我还试着用getMessages方法去死(“我在getMessages方法中”)，但是我不能走那么远。

为了让代码工作，我应该做什么不同的工作呢？

我很感激你的帮助！

编辑：

我对biggestId不好，但声明biggestId：

$biggestId = $this->getBiggestId($locationId);

但解决这个问题并不能解决整个问题。如果是这样的话，第一种方法可以很好地工作：

public function getMessages($locationId, $name) {
    if(!empty($name)) {
        $biggestId = $this->getBiggestId($locationId);

        $messages = $this->dbh->prepare('SELECT * FROM (SELECT * FROM sms WHERE location_id=:locationId ORDER BY id DESC LIMIT 5) AS SOURCE ORDER BY id ASC');
        $messages->bindParam(':locationId', $locationId);
        $messages->execute();

        while ($row = $messages->fetch(PDO::FETCH_OBJ)) {
            $this->fetchData($row, $biggestId, $name);
        }

        $_SESSION[$name] = $biggestId;
    }
}

但是我想要使用这个方法，这样我就不必手动地使用bindParam / BindValue，returnDataObject方法的功能将使我的生活更容易……

Answer 1

作出以下修改：

• 使用fetchAll()而不是fetch()
• 由于使用了fetchAll()，所以使用foreach而不是while循环。

returnDataObject:

public function returnDataObject($query, $parameters) {
    $dataObject = $this->dbh->prepare($query);

    foreach ($parameters as $key => &$value) {
        $dataObject->bindParam($key, $value);
    }

    $dataObject->execute();
    $rows = $dataObject->fetchAll(PDO::FETCH_OBJ);

    return $rows;
}

getMessages:

public function getMessages($locationId, $name) {
    if(!empty($name)) {

        $query = 'SELECT * FROM (SELECT * FROM sms WHERE location_id=:locationId ORDER BY id DESC LIMIT 5) AS SOURCE ORDER BY id ASC';
        $parameters = array(':locationId' => $locationId);

        $rows = $this->returnDataObject($query, $parameters);

        foreach($rows as $row) {
            $this->fetchData($row, $biggestId, $name);
        }

        $this->updateSessionKey($locationId, $name);
    }
}