Question

[已解决]这里的答案 Class query PDO property of non-object

尝试使用while时显示记录时出现此错误。

Notice: Trying to get property of non-object in "$contacts[] = $obj;

这是我的代码

public function selectAll($connect,$order) {
        if ( !isset($order) ) {
            $order = "name";
        }
        $dbIdO=$this->anti_injection($order);
        $dbres =$connect->prepare("SELECT * FROM contacts ORDER BY '".$dbIdO."' ASC");
        $dbres->execute();
        $contacts = array();
        while ($obj = $dbres->fetchAll(PDO::FETCH_ASSOC) != NULL ) {
            $contacts[] = $obj;
        }

        return $contacts;
    }

连接代码

<?php 

class ContactsService {

    private $contactsGateway    = NULL;

        var $myconn;

    public function openDb() {

        $servername = "localhost";
        $username = "root";
        $password = "";
        $dbname = "sample";
        $myconn;


    try{
        $conn = new PDO("mysql:host=$servername;dbname=$dbname",$username,$password);
        //ser the pdo error mode to exception
        $conn->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
        echo "Connect Successfully";
        $this->myconn = $conn;
    }
    catch(PDOException $e)
    {
        echo "Connection failed: " . $e->getMessage();
    }
            return $this->myconn;    
    }

    private function closeDb() {
        $this->myconn = null;
    }

    public function __construct() {
        $this->contactsGateway = new ContactsGateway();
    }

    public function getAllContacts($order) {
        try {
            $this->openDb();
            $connect = $this->myconn;
            $res = $this->contactsGateway->selectAll($connect,$order);
            $this->closeDb();
            return $res;
        } catch (Exception $e) {
            $this->closeDb();
            throw $e;
        }
    }

    public function getContact($id) {
        try {
            $this->openDb();
            $res = $this->contactsGateway->selectById($id);
            $this->closeDb();
            return $res;
        } catch (Exception $e) {
            $this->closeDb();
            throw $e;
        }
        return $this->contactsGateway->find($id);
    }

    private function validateContactParams( $name, $phone, $email, $address ) {
        $errors = array();
        if ( !isset($name) || empty($name) ) {
            $errors[] = 'Name is required';
        }
        if ( empty($errors) ) {
            return;
        }
        throw new ValidationException($errors);
    }

    public function createNewContact( $name, $phone, $email, $address ) {
        try {
            $this->openDb();
            $this->validateContactParams($name, $phone, $email, $address);
            $res = $this->contactsGateway->insert($name, $phone, $email, $address);
            $this->closeDb();
            return $res;
        } catch (Exception $e) {
            $this->closeDb();
            throw $e;
        }
    }

    public function deleteContact( $id ) {
        try {
            $this->openDb();
            $res = $this->contactsGateway->delete($id);
            $this->closeDb();
        } catch (Exception $e) {
            $this->closeDb();
            throw $e;
        }
    }


}

?>

通常当我使用mysqli返回while时，此查询工作正常。但是当我改为pdo时，我没有得到通知的结果。

Answer 1

这个问题不是真的。

$contacts[] = $obj;行无法引发Notice: Trying to get property of non-object错误，因为此行中没有涉及任何属性。

您的代码中没有[可见]语法错误。

最有可能没有SQL错误，好像有任何错误，应该引发异常，但它不是。

除此之外，您的订单将永远不会以您期望的方式运作。您应该根据白名单对其进行过滤，而不是引用字段名称，如here

所示

此外，您编写的循环永远不会以您期望的方式返回数据。努力做到这一点＆＃34;正确＆＃34;你真的把它弄坏了。你想要写的是

    while ($obj = $dbres->fetch(PDO::FETCH_ASSOC)) {
        $contacts[] = $obj;
    }

你真正需要的是

    $contacts = $dbres->fetchAll(PDO::FETCH_ASSOC);

使用pdo函数查询时无法获取属性

1 个答案: