Question

如何使用php 7 mongo驱动程序管理器进行聚合和$ lookup。

如何将以下mongo命令转换为php

db.a.aggregate([{$lookup:{from:"b",localField:"business_id",foreignField:"_id",as:"contact"}}])

同时推荐好的参考教程。

Answer 1

此代码有效

$mng = new MongoDB\Driver\Manager("mongodb://localhost:27017");
$command = new MongoDB\Driver\Command([
    'aggregate' => 'a',
    'pipeline' => [
        ['$lookup' => ["from" => "b","localField" => "business_id","foreignField" => "_id","as" => "contact"]],
    ],
]);
$cursor = $mng->executeCommand('test', $command);

Answer 2

尝试这样的事情：

$mongo->db->a->aggregate([ ['$lookup' => ['from' => 'b', 'localField' => 'business_id', 'foreignField' => '_id', 'as' => 'contact'] ] ]);

Answer 3

PHP7.2

MongoDB 4.2

我从@吉宾·马修（Jibin Mathew）的答案中获得了参考，但是我遇到了一些错误。

然后我添加了

'光标'=>新的stdClass，

这行代码。

现在它可以正常工作了。

//mongo database join example
    public function test_join() {

        global $mng;
        global $dbname;


        $pipeline =  [['$lookup' => ["from" => "b","localField" => "business_id","foreignField" => "_id","as" => "contact"]]];

        $aggregate = new \MongoDB\Driver\Command([
           'aggregate' => 'a', 
           'cursor' => new stdClass,
           'pipeline' => $pipeline,
           ]);

        $cursor = $mng->executeCommand($dbname, $aggregate);
        return $cursor;

    }

在php7 mongo驱动程序管理器中使用$ lookup？

3 个答案: