MongoDB\Client::selectCollection()

MongoDB\Client::selectCollection()

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MongoDB\Client::selectCollection()

Definition

Selects a collection on the server. This method is aliased by [MongoDB\Client::getCollection()](https://www.mongodb.com/docs/php-library/current/reference/method/mongodbclient-getcollection.md#mongodb-phpmethod-phpmethod.MongoDB-Client--getCollection-- and will be replaced by it in a future release.

function selectCollection(
    string $databaseName,
    string $collectionName,
    array $options = []
): MongoDB\Collection

Parameters

$databaseName : string

The name of the database containing the collection to select.

$collectionName : string

The name of the collection to select.

$options : array

An array specifying the desired options.

Name	Type	Description
codec	MongoDB\Codec\DocumentCodec	The default [Encode Data with Type Codecs](https://www.mongodb.com/docs/php-library/current/data-formats/custom-types/codecs.md#std-label-php-codecs to use for collection operations. New in version 1.17
readConcern	MongoDB\Driver\ReadConcern	The default read concern to use for collection operations. Defaults to the client's read concern.
readPreference	MongoDB\Driver\ReadPreference	The default read preference to use for collection operations. Defaults to the client's read preference.
typeMap	array	The default type map to use for collection operations. Defaults to the client's type map.
writeConcern	MongoDB\Driver\WriteConcern	The default write concern to use for collection operations. Defaults to the client's write concern.

Return Values

A [MongoDB\Collection](https://www.mongodb.com/docs/php-library/current/reference/class/mongodbcollection.md#mongodb-phpclass-phpclass.MongoDB-Collection object.

Errors/Exceptions

[MongoDB\Exception\InvalidArgumentException](https://www.mongodb.com/docs/php-library/current/reference/exception-classes.md#mongodb-phpclass-phpclass.MongoDB-Exception-InvalidArgumentException for errors related to the parsing of parameters or options.

Behavior

The selected collection inherits options such as read preference and type mapping from the [Client](https://www.mongodb.com/docs/php-library/current/reference/class/mongodbclient.md#mongodb-phpclass-phpclass.MongoDB-Client object. Options may be overridden by using the $options parameter.

Example

The following example selects the users collection in the test database:

<?php

$client = new MongoDB\Client;

$collection = $client->selectCollection('test', 'users');

The following example selects the users collection in the test database with a custom read preference:

<?php

$client = new MongoDB\Client;

$collection = $client->selectCollection(
    'test',
    'users',
    [
        'readPreference' => new MongoDB\Driver\ReadPreference('primaryPreferred'),
    ]
);

MongoDB\Client::selectCollection()

MongoDB\Client::selectCollection()