Question

目前，从Mongo DB获取的每个文档都转到stdClass对象。我想直接将它加载到我自己的自定义类中。

班级

class TestClass {
    private $id;
    private $class;

    function __construct($id, $name) {
        $this->id = $id;
        $this->class = $class;
    }
}

代码

$m = MongoDB\Driver\Manager('mongodb://<user>:<pass>@<host>/<db>');
$query = MongoDB\Driver\Query(['name' => 'TestFirst']);
// I tried adding the following line, but it says that the constructor args are missing.
// If I omit it, it just adds each cursor object as an instance of stdClass
$opt = ['cursor' => new TestClass];

$results = $m->executeQuery('newDb.testCollection', $query, $opt);

foreach ($results as $document) {
    var_dump($document);
}

我想要实现的目标是什么，或者我是否需要浏览每个stdClass对象并将其转换为TestClass的实例？

Answer 1

类本身需要实现MongoDB\BSON\Unserializable接口和bsonUnserialize(array $data)方法，以将数组从BSON数据转换为相关类。

class TestClass implements MongoDB\BSON\Unserializable, MongoDB\BSON\Serializable {
    private $id;
    private $name;

    function __construct ($id, $name) {
        $this->id = $id;
        $this->name = $name;
    }

    function bsonUnserialize(array $data) {
        // This will be called *instead* of the constructor if unserializing
        $this->id = $data['_id'];
        $this->id = $data['name'];
    }
}

需要设置从查询返回的MongoDB\Driver\Cursor的类型映射，以将文档映射到自定义类的实例。完成的代码看起来像这样。

$mongo = new MongoDB\Driver\Manager($constr);
$query = MongoDB\Driver\Query(['name' => 'TestFirst']);
$cursor = $mongo->executeQuery($query);
$cursor->setTypeMap('root' => 'array', 'document' => 'TestClass', 'array' => 'array');

foreach ($cursor as $doc) {
    var_dump($doc);
}

将MongoDB \ Driver \ Cursor对象直接提取到指定的类中

1 个答案: