Question

这是我的功能，当我调用它时会发生以下错误：

由于此对象是在构造函数中使用表和/或架构创建的，因此它是只读的

public function getImpressionLeft($AvailableCampaigns){
    $result = $this->tableGateway->select(function(Select $select) use ($AvailableCampaigns){
        $select->from(array('a'=>'CampaignSettings'));
        $select->columns(array(
            'a.CampaignID',
            'MaxImpression'=>new \Zend\Db\Sql\Expression('a.MaxImpression - b.TotalImpression'),
            'MaxClick'=> new \Zend\Db\Sql\Expression('a.MaxClick - b.TotalClicks'), 
            ))->join(array('b'=>'ImpressionCount'),'a.CampaignID = b.CampaignID',Select::JOIN_LEFT)
            ->where(new \Zend\Db\Sql\Predicate\In('a.CampaignID',$AvailableCampaigns));
    });
    return $result->getDataSource();
}

Answer 1

你过早关闭你的关闭，我很惊讶你没有得到解析错误。你可能永远不会死于教学。

public function getImpressionLeft($AvailableCampaigns){
        $result = $this->tableGateway->select(function(Select $select) use ($AvailableCampaigns){
            $select->from(array('a'=>'CampaignSettings'));
            $select->columns(array(
                'a.CampaignID',
                'MaxImpression'=>new \Zend\Db\Sql\Expression('a.MaxImpression - b.TotalImpression'),
                'MaxClick'=> new \Zend\Db\Sql\Expression('a.MaxClick - b.TotalClicks'), 
                ))->join(array('b'=>'ImpressionCount','a.CampaignID = b.CampaignID',Select::JOIN_LEFT))
                ->where(new \Zend\Db\Sql\Predicate\In('a.CampaignID',$AvailableCampaigns));
        });
        return $result->getDataSource();
    }

另一点是$ result是一个ResultSet对象，所以你可以在foreach中迭代它来读取每一行，你可以尝试返回$result而不是$result->getDataSource();

无法使用表网关使用join zend framework 2获取记录

1 个答案: