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Collection::getOne — Get one document
Fetches one document from the collection.
This is a shortcut for:
Collection.find("_id = :id").bind("id", id).execute().fetchOne();
idThe document _id in the collection.
The collection object, or null if the _id does not match a document.
示例 #1 mysql_xdevapi\Collection::getOne() example
<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$session->sql("DROP DATABASE IF EXISTS addressbook")->execute();
$session->sql("CREATE DATABASE addressbook")->execute();
$schema = $session->getSchema("addressbook");
$collection = $schema->createCollection("people");
$result = $collection->add('{"name": "Alfred", "age": 42, "job": "Butler"}')->execute();
// A unique _id is (by default, and recommended) generated by MySQL Server
// This retrieves the generated _id's; only one in this example, so $ids[0]
$ids = $result->getGeneratedIds();
$alfreds_id = $ids[0];
// ...
print_r($alfreds_id);
print_r($collection->getOne($alfreds_id));
?>以上示例的输出类似于：
00005b6b536100000000000000b1
Array
(
[_id] => 00005b6b536100000000000000b1
[age] => 42
[job] => Butler
[name] => Alfred
)