[英]Mongodb get average value over period of time per day in PHP
I am playing around with MongoDB and although I've seen posts on the internet about problems similar to mine, but I can't found out how to do it. 我正在玩MongoDB,虽然我在互联网上看过与我类似的问题,但我不知道该怎么做。
I have a quite some documents in my collection that hold sensor measurement data like this: 我的收藏中有一些文件包含传感器测量数据,如下所示:
{
'timestamp' => new MongoDate(1503119239, 0),
'sensor_id' => new MongoInt64(4),
'value' => 12345
}
With of course the timestamp, sensor_id and value different every record. 当然,每个记录的时间戳,sensor_id和值都不同。
Using PHP I want to get the average values PER sensor PER day/month/hour. 使用PHP我想获得PER传感器PER日/月/小时的平均值。 For example I have tried getting the average per day by using 例如,我试过通过使用获得平均每天
$pipeline = array(
array(
'$group' => array(
'_id' => ['sensor_id'=> '$sensor', '$dayOfYear'=>'$timestamp'],
'avgValue' => array( '$avg' => '$value' ),
),
),
);
$out = $logdataCollection->aggregate( $pipeline );
I'd expect it to give me an output of, for example 例如,我希望它能给我一个输出
[0] => ['sensor_id' => '1', 'dayOfYear'=>12, 'avgValue'=>1.123],
[1] => ['sensor_id' => '1', 'dayOfYear'=>13, 'avgValue'=>0.15],
[2] => ['sensor_id' => '2', 'dayOfYear'=>12, 'avgValue'=>1.123],
[3] => ['sensor_id' => '3', 'dayOfYear'=>15, 'avgValue'=>1.123],
etc. 等等
This example shows the average by day (over the period of a year), but I want to be able to this per hour as well over the period of a month: 此示例显示了按天计算的平均值(在一年中),但我希望能够在一个月内每小时执行此操作:
[0] => ['sensor_id' => '1', 'date'=>2015-01-01, 'avgValue'=>1.123],
[1] => ['sensor_id' => '1', 'date'=>2015-01-02, 'avgValue'=>0.15],
[2] => ['sensor_id' => '2', 'date'=>2015-01-01, 'avgValue'=>1.123],
[3] => ['sensor_id' => '3', 'date'=>2015-01-02, 'avgValue'=>1.123],
etc. 等等
At first my timestamps where just numeric but I thought inserting them as MongoDateTime would perhaps make a difference in this. 起初我的时间戳只是数字,但我认为将它们插入MongoDateTime可能会对此产生影响。 It didn't. 它没有。
I have read the docs about Aggregration framework, SO and the PHP website, but I just can not find out how to do it. 我已经阅读了关于Aggregration框架,SO和PHP网站的文档,但我无法找到如何做到这一点。 Please help! 请帮忙!
Finally I found out how to get the results for my examples. 最后,我发现了如何获得我的示例的结果。 I am groupping them on a formatted date as follows: 我正在按照以下格式化日期:
$pipeline = array(
array(
'$group' => array(
'_id' => ['foundDate'=>['$dateToString'=>['format'=>'%Y-%m-%d', 'date'=>'$timestamp']], 'sensor'=>'$sensor'],
'avgValue' => array( '$avg' => '$value' ),
),
),
);
In which i can set the date format to anything, the query will group on that. 我可以在其中将日期格式设置为任何内容,查询将对其进行分组。 For example the mentioned code will output: 例如,提到的代码将输出:
[0]=>
array(2) {
["_id"]=>
array(2) {
["foundDate"]=>
string(10) "2016-03-23"
["sensor"]=>
int(2)
}
["avgValue"]=>
float(526.622580645)
}
[1]=>
array(2) {
["_id"]=>
array(2) {
["foundDate"]=>
string(10) "2016-03-23"
["sensor"]=>
int(3)
}
["avgValue"]=>
float(480.773846154)
}
...
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