MongoCollection::findOne

(PECL mongo >=0.9.0)

MongoCollection::findOne — Queries this collection, returning a single element

Beschreibung

public MongoCollection::findOne ([ array $query = array() [, array $fields = array() [, array $options = array() ]]] ) : array

As opposed to MongoCollection::find(), this method will return only the first result from the result set, and not a MongoCursor that can be iterated over.

Parameter-Liste

query

The fields for which to search. MongoDB's query language is quite extensive. The PHP driver will in almost all cases pass the query straight through to the server, so reading the MongoDB core docs on » find is a good idea.

Warnung

Please make sure that for all special query operaters (starting with $) you use single quotes so that PHP doesn't try to replace "$exists" with the value of the variable $exists.

fields

Fields of the results to return. The array is in the format array('fieldname' => true, 'fieldname2' => true). The _id field is always returned.

options

This parameter is an associative array of the form array("name" => <value>, ...). Currently supported options are:

  • "maxTimeMS"

    Specifies a cumulative time limit in milliseconds for processing the operation (does not include idle time). If the operation is not completed within the timeout period, a MongoExecutionTimeoutException will be thrown.

Rückgabewerte

Returns record matching the search or NULL.

Fehler/Exceptions

Throws MongoConnectionException if it cannot reach the database.

Changelog

Version Beschreibung
PECL mongo 1.5.0 Added optional options argument.

Beispiele

Beispiel #1 MongoCollection::findOne() document by its id.

This example demonstrates how to find a single document in a collection by its id.

<?php

$articles = $mongo->my_db->articles;

$article = $articles->findOne(array('_id' => new MongoId('47cc67093475061e3d9536d2')));

?>

Beispiel #2 MongoCollection::findOne() document by some condition.

This example demonstrates how to find a single document in a collection by some condition and limiting the returned fields.

<?php

$users = $mongo->my_db->users;
$user = $users->findOne(array('username' => 'jwage'), array('password'));
print_r($user);

?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Array
(
    [_id] => MongoId Object
        (
        )

    [password] => test
)

Notice how even though the document does have a username field, we limited the results to only contain the password field.

Siehe auch