php教程

The MongoDB\Driver\Query class

(mongodb >=1.0.0)

简介

The MongoDB\Driver\Query class is a value object that represents a database query.

类摘要

final MongoDB\Driver\Query {
/* 方法 */
final public __construct ( array|object $filter [, array $queryOptions ] )
}

Table of Contents

User Contributed Notes

tiwaritusharudayan at gmail dot com 15-Jun-2018 09:29
This format displays the documents returned from the query as stdClass Objects. For display purposes, it's fine, but if certain computations need to be performed using the returned documents and their corresponding fields, use this:

------------------------------------Code Snippet-----------------------------------

$connection = new MongoDB\Driver\Manager("mongodb://localhost:27017");
   
$filter = ["name"=>"insert_desired_name_here"];
/* the following condition, and others similar to it, work as well

$filter = ["age"=>["$gt"=>"18"]]; /*/
   
$options = []; /* put desired options here, should you need any */
   
$query = new MongoDB\Driver\Query($filter,$options);
   
$documents = $connection->executeQuery('trial.trial' /*dbname.collection_name*/,$query);
   
foreach($documents as $document){
    $document = json_decode(json_encode($document),true);
    echo $document[name];
}

--------------------------------------------------------------------------------------

The first executable statement inside the foreach encodes the returned stdClass object to a json object, and the same is immediately decoded to an associative array, which can then be used as and when needed
dvdogrady at gmail dot com 29-Oct-2017 03:58
Hello

Im just writing this note to help people out who want to write $filter arrays with query operators in them.

I have copied this code off maha88a's note but I changed the $filter to give you an idea of how it would work with the query operators

Considering the following MangoDB collection:

<?php
/* my_collection */

/* 1 */
{
    "_id" : ObjectId("5707f007639a94cbc600f282"),
    "id" : 1,
    "name" : "Name 1"
}

/* 2 */
{
    "_id" : ObjectId("5707f0a8639a94f4cd2c84b1"),
    "id" : 2,
    "name" : "Name 2"
}
?>

I'm using the following code:
<?php
// This $filter will return any id's qualing to 2 but what if we want all the id's above 0.
// $filter = ['id' => 2];
// This is how we would do this.
$filter = ['id' => ['$gt' => 0]]
$options = [
   'projection' => ['_id' => 0],
];
$query = new MongoDB\Driver\Query($filter, $options);
$rows = $mongo->executeQuery('db_name.my_collection', $query); // $mongo contains the connection object to MongoDB
foreach($rows as $r){
   print_($r);
}
?>
yatiny3007 at gmail dot com 04-Feb-2017 07:03
Find By _id

$mongo = new \MongoDB\Driver\Manager('mongodb://root:root@192.168.0.127/db');

$id           = new \MongoDB\BSON\ObjectId("588c78ce02ac660426003d87");
$filter      = ['_id' => $id];
$options = [];

$query = new \MongoDB\Driver\Query($filter, $options);
$rows   = $mongo->executeQuery('db.collectionName', $query);

foreach ($rows as $document) {
  pr($document);
}
Dalahimself 17-Nov-2016 07:12
How to query for an MongoDb _id with value $id

<?php
$filter=array();
$filter['_id']=new MongoDB\BSON\ObjectID($id);
               
$command=[
                  'find' => 'my_collection',
                  'filter' => $filter
];
               
$query = new MongoDB\Driver\Command($command);
?>
maha88a 09-Apr-2016 05:38
Here is an example of Query to retrieve the records from MangoDB collection using a filter. It will return in this case just one record that satisfy the filter id = 2.

Considering the following MangoDB collection:

<?php
/* my_collection */

/* 1 */
{
    "_id" : ObjectId("5707f007639a94cbc600f282"),
    "id" : 1,
    "name" : "Name 1"
}

/* 2 */
{
    "_id" : ObjectId("5707f0a8639a94f4cd2c84b1"),
    "id" : 2,
    "name" : "Name 2"
}
?>

I'm using the following code:
<?php
$filter = ['id' => 2];
$options = [
   'projection' => ['_id' => 0],
];
$query = new MongoDB\Driver\Query($filter, $options);
$rows = $mongo->executeQuery('db_name.my_collection', $query); // $mongo contains the connection object to MongoDB
foreach($rows as $r){
   print_($r);
}
?>
andzandz 15-Mar-2016 12:10
Careful with your filter here - integers and strings are different.

With a string ID '1000', this query will mysteriously return 0 results; wasted time figuring out what was going on:

$query = new MongoDB\Driver\Query(['_id' => 1000]);

This will work:

$query = new MongoDB\Driver\Query(['_id' => '1000']);

Would be nice if the library could handle this.

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