MongoDB::setReadPreference

(PECL mongo >=1.3.0)

MongoDB::setReadPreference — Set the read preference for this database

Beschreibung

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

Parameter-Liste

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.

Rückgabewerte

Returns TRUE on success, or FALSE otherwise.

Fehler/Exceptions

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.

Beispiele

Beispiel #1 MongoDB::setReadPreference() tag set array syntax example


<?php

$m = new MongoClient();
$db = $m->test;

// Prefer the nearest server in the "east" data center also used for reporting,
// but fall back to a server in the "west" data center
$db->setReadPreference(MongoClient::RP_NEAREST, array(
    array('dc' => 'east', 'use' => 'reporting'),
    array('dc' => 'west'),
));
?>

Siehe auch

The read preferences documentation.
MongoDB::getReadPreference() - Get the read preference for this database