Question

我知道mongoDB（php-driver）将日期保存为以毫秒UTC为单位的ISODate，因此我必须为我的时区（GMT +2：00）添加一个偏移到聚合查询。

$dateStart = new MongoDB\BSON\UTCDateTime(strtotime("now 00:00:00") * 1000);
$dateEnd   = new MongoDB\BSON\UTCDateTime(time() * 1000);

$queryHours = [
            ['$match' => ['date' => ['$gte' => $dateStart, '$lte' => $dateEnd]]],
            ['$project' => ['date' => ['$add' => ['$date', 2*60*60000]]]],
            ['$group' => ['_id' => ['$hour' => '$date'], 'average' => ['$avg' => '$zapi.apiRes.curlHeader.total_time']]],
            ['$sort' => ['_id' => 1]],
        ];

$ hour结果似乎是正确的，但我没有得到“平均”结果，我几天都没有看到我的失败，盯着代码。：（

示例文档：

{
    "_id" : ObjectId("58e4e3ca135d9e038242b248"),
    "date" : ISODate("2017-04-05T12:32:10Z"),
    [...]
    "zapi" : {
            "apiRes" : {
                    "apiCall" : {
                            [...]
                    },
                    "curlHeader" : {
                            "url" : "http://api:/api/foo",
                            "http_code" : 204,
                            "total_time" : 0.02906399999999998,
                            [...]
                    },
            }
    },

}

我知道mongoDB正在使用这个功能：https://jira.mongodb.org/browse/SERVER-28611。

谢谢和最诚挚的问候，

lun4tic

Answer 1

您的错误应该是项目阶段。您必须添加'zapi.apiRes.curlHeader.total_time' => 1，请尝试以下操作：

$queryHours = [
            ['$match' => ['date' => ['$gte' => $dateStart, '$lte' => $dateEnd]]],
            ['$project' => ['date' => ['$add' => ['$date', 2*60*60000]], 'zapi.apiRes.curlHeader.total_time' => 1]],
            ['$group' => ['_id' => ['$hour' => '$date'], 'average' => ['$avg' => '$zapi.apiRes.curlHeader.total_time']]],
            ['$sort' => ['_id' => 1]],
        ];

Answer 2

如果您使用的是3.4版本，则可以将$project阶段替换为$addFields。

$queryHours = 
[
      ['$match' => ['date' => ['$gte' => $dateStart, '$lte' => $dateEnd]]],
      ['$addFields' => ['date' => ['$add' => ['$date', 2*60*60000]]]],
      ['$group' => ['_id' => ['$hour' => '$date'], 'average' => ['$avg' => '$zapi.apiRes.curlHeader.total_time']]],
      ['$sort' => ['_id' => 1]],
];

或

您只需将时区算术从$project阶段移至$group阶段即可。

 ['$group' => ['_id' => ['$hour' => [ '$add' => ['$date', 2*60*60000] ] ], 'average' => ['$avg' => '$zapi.apiRes.curlHeader.total_time']]],

MongoDB php添加tz偏移量来聚合查询和平均输出

2 个答案: