MongoCollection::findOne
(PECL mongo >=0.9.0)
MongoCollection::findOne — Queries this collection, returning a single element
Опис
$query = array()
[, array $fields = array()
[, array $options = 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.
Параметри
-
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.
УвагаPlease 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.
Значення, що повертаються
Returns record matching the search or NULL.
Помилки/Винятки
Throws MongoConnectionException if it cannot reach the database.
Журнал Змін
| Версія | Опис |
|---|---|
| 1.5.0 |
Added optional options argument.
|
Приклади
Приклад #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')));
?>
Приклад #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);
?>
Наведений вище приклад виведе щось подібне до:
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.
Прогляньте Також
- MongoCollection::find() - Queries this collection, returning a MongoCursor for the result set
- MongoCollection::insert() - Inserts a document into the collection
- MongoDB core docs on » find.
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