MongoClient::setReadPreference

(PECL mongo >=1.3.0)

MongoClient::setReadPreference — 为锟斤拷锟斤拷锟斤拷锟斤拷锟矫讹拷取选锟斤拷

This extension that defines this method is deprecated. Instead, the MongoDB extension should be used. There is no equivalent for this method in the new extension.

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

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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.

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Returns TRUE on success, or FALSE otherwise.

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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.

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Example #1 MongoClient::setReadPreference() 锟斤拷签锟斤拷锟斤拷锟斤拷锟斤法锟斤拷锟斤拷锟斤拷

<?php

$m = new MongoClient();

// 锟斤拷选锟斤拷锟斤拷锟� "east" 锟斤拷锟斤拷锟斤拷锟侥的凤拷锟斤拷锟斤拷锟斤拷也锟斤拷锟节憋拷锟芥，
// 失锟斤拷时锟斤拷锟斤拷 "west" 锟斤拷锟斤拷锟斤拷锟侥的凤拷锟斤拷锟斤拷
$m->setReadPreference(MongoClient::RP_NEAREST, array(
    array('dc' => 'east', 'use' => 'reporting'),
    array('dc' => 'west'),
));
?>

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