如何在Mongodb中使用聚合函数？

Question

I have upgraded php5 to php7. If I use mongoClient for mongodb connection it shows error.So I used following command.

$manager = new MongoDB\\Driver\\Manager("mongodb://".MONGOHOST.":27017");

By using above command I can able to connect db.Now problem is In php5, I used aggregate function.It doesn't support in php7. Code used in php5 mentioned below..

for db connection

$m = new MongoClient('mongodb://'.MONGOHOST.'', array('username' => MONGOUSER, 'password' => MONGOPASS, 'db'=> MONGODB )); $db = $m->selectDB(MONGODB);

to retrieve value from db:

$ops = array(
        array(
             '$match'=>array(
                "datetime"=>array('$gte'=>$start,'$lte'=>$end)
                )
            ),
        array(
            '$group' => array(
                "_id" => array("slotid" => '$slotid',"bidder" => '$bidder',"viewerid" => '$viewerid',"mediatype"=>'$mediatype'),"total" => array('$sum' => 1),"sitename" =>array('$addToSet' => '$sitename'),"aid" =>array('$addToSet' => '$accountid'),
                ),
            ),
        );

$reqbids = $db->requestbids->aggregate($ops);

How to do this is using mongo driver..I have searching 2 days,but didn't find the solution.

Answer 1

You can't use mongoClient.
You have to use Mongodb manager
http://php.net/manual/en/class.mongodb-driver-manager.php

and for aggregate function use following code. Link
$conn = new MongoDB\\Driver\\Manager("mongodb://127.0.0.1");

$command = new MongoDB\Driver\Command([
    'aggregate' => 'collection',
    'pipeline' => [
        ['$group' => ['_id' => '$y', 'sum' => ['$sum' => '$x']]],
    ],
    'cursor' => new stdClass,
]);
$cursor = $manager->executeCommand('db', $command);