MongoCursor::setReadPreference

(PECL mongo >=1.3.3)

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

Descrição

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

Parâmetros

read_preference

The read preference mode: MongoClient::RP_PRIMARY, MongoClient::RP_PRIMARY_PREFERRED, MongoClient::RP_SECONDARY, MongoClient::RP_SECONDARY_PREFERRED, ou 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.

Valor Retornado

Returns this cursor.

Erros

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.

Exemplos

Exemplo #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'),
));
?>

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