CollectionModify::limit
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CollectionModify::limit — Limit number of modified documents
说明
Limit the number of documents modified by this operation. Optionally combine with skip() to define an offset value.
参数
-
rows -
The maximum number of documents to modify.
返回值
A CollectionModify object.
示例
示例 #1 mysql_xdevapi\CollectionModify::limit() 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");
$collection->add('{"name": "Fred", "age": 21, "job": "Construction"}')->execute();
$collection->add('{"name": "Wilma", "age": 23, "job": "Teacher"}')->execute();
$collection->add('{"name": "Betty", "age": 24, "job": "Teacher"}')->execute();
$collection
->modify("job = :job")
->bind(['job' => 'Teacher'])
->set('job', 'Principal')
->limit(1)
->execute();
$result = $collection
->find()
->execute();
print_r($result->fetchAll());
?>以上示例的输出类似于：
Array
(
[0] => Array
(
[_id] => 00005b6b53610000000000000118
[age] => 21
[job] => Construction
[name] => Fred
)
[1] => Array
(
[_id] => 00005b6b53610000000000000119
[age] => 23
[job] => Principal
[name] => Wilma
)
[2] => Array
(
[_id] => 00005b6b5361000000000000011a
[age] => 24
[job] => Teacher
[name] => Betty
)
)
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