MongoCursor::setReadPreference

(PECL mongo >=1.3.3)

MongoCursor::setReadPreference — Set the read preference for this query

설명

public MongoCursor MongoCursor::setReadPreference ( string $read_preference [, array $tags ] )

인수

read_preference: The read preference mode: MongoClient::RP_PRIMARY, MongoClient::RP_PRIMARY_PREFERRED, MongoClient::RP_SECONDARY, MongoClient::RP_SECONDARY_PREFERRED, or MongoClient::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