MongoCursor::setReadPreference
(PECL mongo >=1.3.3)
MongoCursor::setReadPreference — Set the read preference for this query
설명
인수
-
read_preference -
The read preference mode:
MongoClient::RP_PRIMARY,MongoClient::RP_PRIMARY_PREFERRED,MongoClient::RP_SECONDARY,MongoClient::RP_SECONDARY_PREFERRED, orMongoClient::RP_NEAREST. -
tags -
An array of zero or more tag sets, where each tag set is itself an array of criteria used to match tags on replica set members.
반환값
Returns this cursor.
오류/예외
Emits E_WARNING if either parameter is invalid, or if one or more tag sets are provided with the MongoClient::RP_PRIMARY read preference mode.
예제
Example #1 MongoCursor::setReadPreference() tag set array syntax example
<?php
$m = new MongoClient();
$cursor = $m->test->users->find();
// Prefer the nearest server in the "east" data center also used for reporting,
// but fall back to a server in the "west" data center
$cursor->setReadPreference(MongoClient::RP_NEAREST, array(
array('dc' => 'east', 'use' => 'reporting'),
array('dc' => 'west'),
));
?>
참고
- The read preferences documentation.
- MongoCursor::getReadPreference() - Get the read preference for this query
- MongoCursorInterface::setReadPreference() - Set the read preference for this query
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