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MongoDB aggregate


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Labdien,

 

Vēlējos apjautāties kā pareizi jāveido MongoDB aggregate pieprasījums ar PHP palīdzību ?

 

Meiģināšu šādu: http://php.net/manual/en/mongocollection.aggregate.php, bet neizdodas.

 

Stāv Xampp ar PHP 5.6 uz Windows 7.

 

Dataseti:

{
    "_id": {
        "$oid": "58868a5737d44aec0c86ea7d"
    },
    "serial": "0002100032",
    "topic": "TEMPERATURE",
    "payload": {
        "temp-ch1-0002100032": "46.50"
    },
    "_msgid": "dbf9bde5.643f6",
    "timestamp": "2017-01-23T22:57:27.741Z"
}

{
    "_id": {
        "$oid": "58868a5737d44aec0c86ea7f"
    },
    "serial": "0002100032",
    "topic": "TEMPERATURE",
    "payload": {
        "temp-ch2-0002100032": "40.19"
    },
    "_msgid": "dbf9bde5.643f6",
    "timestamp": "2017-01-23T22:57:27.748Z"
}

{
    "_id": {
        "$oid": "58868b8137d44aec0c86eaa7"
    },
    "serial": "0002100032",
    "topic": "TEMPERATURE",
    "payload": {
        "temp-ch1-0002100032": "46.50"
    },
    "_msgid": "76b17f37.89414",
    "timestamp": "2017-01-23T23:02:25.745Z"
}

{
    "_id": {
        "$oid": "58868b8137d44aec0c86eaa9"
    },
    "serial": "0002100032",
    "topic": "TEMPERATURE",
    "payload": {
        "temp-ch2-0002100032": "40.19"
    },
    "_msgid": "76b17f37.89414",
    "timestamp": "2017-01-23T23:02:25.750Z"
}

Vēlos nosummēt "temp-ch2-0002100032".

$usage = $db->Usage->aggregate(array('$serial' => array('payload' => 'temp-ch1-6F0011')));

Loģiski kļūda:

Fatal error: Uncaught exception 'MongoResultException' with message 'ds029486.mlab.com:29486: Unrecognized pipeline stage name: '$serial'' in C:\xampp2\htdocs\mongodb.php:8 Stack trace: #0 C:\xampp2\htdocs\mongodb.php(8): MongoCollection->aggregate(Array) #1 {main} thrown in C:\xampp2\htdocs\mongodb.php on line 8

Aizmirsu piemirst, ka MongoDB esmu izcils iesācējs, bet pats MongoDB strādā un saslēgums strādā, `find` var pielietot un izgūt kādu rezultātu.

 

Ceru uz izpratni.

 

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