MongoCursor
PHP Manual

MongoCursor::setReadPreference

(PECL mongo >=1.3.3)

MongoCursor::setReadPreferenceSet the read preference for this query

Beschreibung

public MongoCursor MongoCursor::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 this cursor.

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 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'),
));
?>

Siehe auch


MongoCursor
PHP Manual