如何在php中通过ObjectId查找mongodb集合项

我有一个mongodb数据库，其中包含两个连接的集合

第一个数据集如下所示：

{
"_id": ObjectId("5326d2a61db62d7d2f8c13c0"),
"reporttype": "visits",
"country": "AT",
"channel": "wifi",
"_level": NumberInt(3)
}   

{
"_id": ObjectId("54c905662d0a99627efe17a9"),
"avg": NumberInt(0),
"chunk_begin": ISODate("2015-01-28T12:00:00.0Z"),
"count": NumberInt(15),
"max": NumberInt(0),
"min": NumberInt(0),
"sum": NumberInt(0),
"tag": ObjectId("5326d2a61db62d7d2f8c13c0")
}   

// select a collection (analog to a relational database's table)
$tagCollection = $db->tags;
$orderCollection = $db->orders;


// formulate AND query
$aTagCriteria = array(
    'reporttype' => new MongoRegex('/[a-z]+/'),
);
// retrieve only _id keys
$fields = array('_id');

$cursor = $tagCollection->find($aTagCriteria, $fields);

$startOfTimeperiod = new MongoDate(strtotime('2015-01-05 00:00:00'));
$endOfTimeperiod = new MongoDate(strtotime('2015-01-07 13:20:00'));

// iterate through the result set
foreach ($cursor as $obj) {
    echo '_id: '.$obj['_id'].' | ';
    // Until here all is ok, I get the _id as output.
    $aOrdercriteria = array(
        'tag'  => new MongoId($obj['_id']),
        'date' => array(
            '$lte' => $endOfTimeperiod,
            '$gte' => $startOfTimeperiod
        ),
    );

    $iCount = $orderCollection->count($aOrdercriteria);
    if ($iCount > 0) {
        echo PHP_EOL.$iCount.' document(s) found.'.PHP_EOL;
        $result = $orderCollection->remove($aOrdercriteria);
        echo __FUNCTION__.'|'.__LINE__.' | '.json_encode($result).PHP_EOL;
        echo 'Removed document with ID: '.$aOrdercriteria['tag'].PHP_EOL;
    }
}

ObjectId连接到第二个集合中的多个数据集，如下所示：

{
"_id": ObjectId("5326d2a61db62d7d2f8c13c0"),
"reporttype": "visits",
"country": "AT",
"channel": "wifi",
"_level": NumberInt(3)
}   

{
"_id": ObjectId("54c905662d0a99627efe17a9"),
"avg": NumberInt(0),
"chunk_begin": ISODate("2015-01-28T12:00:00.0Z"),
"count": NumberInt(15),
"max": NumberInt(0),
"min": NumberInt(0),
"sum": NumberInt(0),
"tag": ObjectId("5326d2a61db62d7d2f8c13c0")
}   

// select a collection (analog to a relational database's table)
$tagCollection = $db->tags;
$orderCollection = $db->orders;


// formulate AND query
$aTagCriteria = array(
    'reporttype' => new MongoRegex('/[a-z]+/'),
);
// retrieve only _id keys
$fields = array('_id');

$cursor = $tagCollection->find($aTagCriteria, $fields);

$startOfTimeperiod = new MongoDate(strtotime('2015-01-05 00:00:00'));
$endOfTimeperiod = new MongoDate(strtotime('2015-01-07 13:20:00'));

// iterate through the result set
foreach ($cursor as $obj) {
    echo '_id: '.$obj['_id'].' | ';
    // Until here all is ok, I get the _id as output.
    $aOrdercriteria = array(
        'tag'  => new MongoId($obj['_id']),
        'date' => array(
            '$lte' => $endOfTimeperiod,
            '$gte' => $startOfTimeperiod
        ),
    );

    $iCount = $orderCollection->count($aOrdercriteria);
    if ($iCount > 0) {
        echo PHP_EOL.$iCount.' document(s) found.'.PHP_EOL;
        $result = $orderCollection->remove($aOrdercriteria);
        echo __FUNCTION__.'|'.__LINE__.' | '.json_encode($result).PHP_EOL;
        echo 'Removed document with ID: '.$aOrdercriteria['tag'].PHP_EOL;
    }
}

如您所见，第一个数据集中的“_id”与第二个数据集中的“tag”相同

我想用php编写一个例程，从第一个集合中获取ID，并在第二个集合中的某个时间段内查找数据集以进行删除

我从第一个集合中获得了id，但我怀疑我在第二个集合的查询中使用了错误的id，因为没有找到或删除任何内容

代码如下所示：

{
"_id": ObjectId("5326d2a61db62d7d2f8c13c0"),
"reporttype": "visits",
"country": "AT",
"channel": "wifi",
"_level": NumberInt(3)
}   

{
"_id": ObjectId("54c905662d0a99627efe17a9"),
"avg": NumberInt(0),
"chunk_begin": ISODate("2015-01-28T12:00:00.0Z"),
"count": NumberInt(15),
"max": NumberInt(0),
"min": NumberInt(0),
"sum": NumberInt(0),
"tag": ObjectId("5326d2a61db62d7d2f8c13c0")
}   

// select a collection (analog to a relational database's table)
$tagCollection = $db->tags;
$orderCollection = $db->orders;


// formulate AND query
$aTagCriteria = array(
    'reporttype' => new MongoRegex('/[a-z]+/'),
);
// retrieve only _id keys
$fields = array('_id');

$cursor = $tagCollection->find($aTagCriteria, $fields);

$startOfTimeperiod = new MongoDate(strtotime('2015-01-05 00:00:00'));
$endOfTimeperiod = new MongoDate(strtotime('2015-01-07 13:20:00'));

// iterate through the result set
foreach ($cursor as $obj) {
    echo '_id: '.$obj['_id'].' | ';
    // Until here all is ok, I get the _id as output.
    $aOrdercriteria = array(
        'tag'  => new MongoId($obj['_id']),
        'date' => array(
            '$lte' => $endOfTimeperiod,
            '$gte' => $startOfTimeperiod
        ),
    );

    $iCount = $orderCollection->count($aOrdercriteria);
    if ($iCount > 0) {
        echo PHP_EOL.$iCount.' document(s) found.'.PHP_EOL;
        $result = $orderCollection->remove($aOrdercriteria);
        echo __FUNCTION__.'|'.__LINE__.' | '.json_encode($result).PHP_EOL;
        echo 'Removed document with ID: '.$aOrdercriteria['tag'].PHP_EOL;
    }
}

搜索条件查找标记对象的正确方法是什么 使用以前找到的id

附言： 我试过了

'tag'  => $obj['_id'],

而不是

'tag'  => new MongoId($obj['_id']),

---

这也不起作用。

所以有两件事必须改变

第一个就像EmptyArsenal暗示的那样：

tag'  => new MongoId($obj['_id']), 

是错误的，因为$obj[''u id']已经是一个对象

所以

这是正确的。

---

如果我把我的状态从“日期”改为“开始”yahooo。。。。它起作用了。愚蠢的我。

我不是PHP用户，但我已经确认了_id是字符串？一些驱动程序会自动将其转换为对象id.var_dump（$obj）；给我：数组（1）{[“\u id”]=>object（MongoId）{10（1）{[“$id”]=>string（24）“537c89d51db62d7d2fd1d37d”}当我解释这个$obj[''u id']应该是一个对象时。看起来这个{u id'已经是一个MongoId了，所以在构建查询时尽量不要将它强制转换为MongoId。所以'tag'=>$obj['u id']，应该是正确的吗？