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我很头疼，想和你分享:)

这是我的代码（我在 php+mongo 中做的一个小项目的一部分）：

<?php
$db = new MongoClient('mongodb://localhost');
$db->connect();
$collection = $db->{'someDb'}->{'someCollection'};
print '********************************************' . PHP_EOL;
print '********          SAVE           ***********' . PHP_EOL;
print '********************************************' . PHP_EOL;
$obj = array(
    "_id" =>new MongoId(),
    "dob" => new MongoDate(strtotime("1983-08-31T04:00:00Z")),
    "name" =>"Author [541a88934d1ed8.64628062]",
    "password" => "229fe88b25ae8307601bf6c9c050bf02755b7e26",
    "timezone" => "Australia/Sydney",
    "expiry" => new MongoDate(strtotime("2015-09-18T07:24:03Z")),
    "token" => array(
        0 => array(
            "title" => "API Test",
            "hash" => "ce9808c5063f114f21cbf2d7e194caeccd17d0ae",
            "expiry" => new MongoDate(strtotime("2015-09-18T07:24:03Z"))
        )
    )
);
print_r($obj);
$collection->save($obj);
print '********************************************' . PHP_EOL;
print '********         SEARCH          ***********' . PHP_EOL;
print '********************************************' . PHP_EOL;
$where = array(
    'token.hash' => 'ce9808c5063f114f21cbf2d7e194caeccd17d0ae',
    'expiry' => array('$lt' => new \MongoDate())
);
print '>>> CRITERIA ' . PHP_EOL;
print_r($where);
print '>>> RESULT ' . PHP_EOL;
$cursor = $collection->find()->limit(1);
$result = iterator_to_array($cursor);
$result = array_shift($result);
print_r($result);
print '********************************************' . PHP_EOL;
print '********     NESTED SEARCH       ***********' . PHP_EOL;
print '********************************************' . PHP_EOL;
$where = array(
    'token.hash' => 'ce9808c5063f114f21cbf2d7e194caeccd17d0ae',
    'token.expiry' => array('$lt' => new \MongoDate())
);
print '>>> CRITERIA ' . PHP_EOL;
print_r($where);
$cursor = $collection->find($where)->limit(1);
$result = iterator_to_array($cursor);
$result = array_shift($result);
print '>>> RESULT ' . PHP_EOL;
var_dump($result);

第一次搜索完美，但第二次搜索没有按预期工作，查看结果：

********************************************
********          SAVE           ***********
********************************************
Array
(
    [_id] => MongoId Object
        (
            [$id] => 541a9111c48e5859108b4567
        )

    [dob] => MongoDate Object
        (
            [sec] => 431150400
            [usec] => 0
        )

    [name] => Author [541a88934d1ed8.64628062]
    [password] => 229fe88b25ae8307601bf6c9c050bf02755b7e26
    [timezone] => Australia/Sydney
    [expiry] => MongoDate Object
        (
            [sec] => 1442561043
            [usec] => 0
        )

    [token] => Array
        (
            [0] => Array
                (
                    [title] => API Test
                    [hash] => ce9808c5063f114f21cbf2d7e194caeccd17d0ae
                    [expiry] => MongoDate Object
                        (
                            [sec] => 1442561043
                            [usec] => 0
                        )

                )

        )

)
********************************************
********         SEARCH          ***********
********************************************
>>> CRITERIA 
Array
(
    [token.hash] => ce9808c5063f114f21cbf2d7e194caeccd17d0ae
    [expiry] => Array
        (
            [$lt] => MongoDate Object
                (
                    [sec] => 1411027217
                    [usec] => 868000
                )

        )

)
>>> RESULT 
Array
(
    [_id] => MongoId Object
        (
            [$id] => 541a8e23c48e58700f8b4567
        )

    [dob] => MongoDate Object
        (
            [sec] => 431150400
            [usec] => 0
        )

    [name] => Author [541a88934d1ed8.64628062]
    [password] => 229fe88b25ae8307601bf6c9c050bf02755b7e26
    [timezone] => Australia/Sydney
    [token] => Array
        (
            [0] => Array
                (
                    [title] => API Test
                    [hash] => ce9808c5063f114f21cbf2d7e194caeccd17d0ae
                    [expiry] => MongoDate Object
                        (
                            [sec] => 1442561043
                            [usec] => 0
                        )

                )

        )

)
********************************************
********     NESTED SEARCH       ***********
********************************************
>>> CRITERIA 
Array
(
    [token.hash] => ce9808c5063f114f21cbf2d7e194caeccd17d0ae
    [token.expiry] => Array
        (
            [$lt] => MongoDate Object
                (
                    [sec] => 1411027217
                    [usec] => 870000
                )

        )

)
>>> RESULT 
NULL

我不是 MongoDb 大师，只是一个可怜的程序员试图挽救他的一天，有人知道为什么会这样吗？我究竟做错了什么？

PHP版本：

valerio@beatrice:~$ php -v
PHP 5.5.9-1ubuntu4.4 (cli) (built: Sep  4 2014 06:56:34) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies
valerio@beatrice:~$

MongoDb 驱动程序信息（来自 php -info）

MongoDB Support => enabled
Version => 1.4.5
SSL Support => enabled
Streams Support => enabled

Directive => Local Value => Master Value
mongo.allow_empty_keys => 0 => 0
mongo.chunk_size => 262144 => 262144
mongo.cmd => $ => $
mongo.default_host => localhost => localhost
mongo.default_port => 27017 => 27017
mongo.is_master_interval => 15 => 15
mongo.long_as_object => 0 => 0
mongo.native_long => 0 => 0
mongo.ping_interval => 5 => 5
4

1 回答 1

1

假设您提供的文档是集合中唯一的内容，它与您列出的任何一个条件模式都不匹配。第一个“搜索”示例返回文档的唯一原因是您没有传递$where给该find()方法：

$collection->find()->limit(1);

附带说明一下，由于您的第二个条件模式（即“NESTED SEARCH”）正在查询同一数组中的两个嵌套字段，我假设您实际上可能希望确保它们与同一数组元素中的嵌套字段匹配。$elemMatch查询运算符可以帮助解决这个问题：

$where = [
  'token' => [
    '$elemMatch' => [
      'hash' => 'ce9808c5063f114f21cbf2d7e194caeccd17d0ae',
      'expiry' => ['$lt' => new \MongoDate()],
    ],
  ],
];

如果没有$elemMatch，您的原始条件可能会匹配具有多个令牌对象的文档，其中一个恰好只匹配hash子句，而另一个匹配expiry.

于 2014-10-07T15:37:45.773 回答