(PECL mongo >=1.6.0)
MongoCommandCursor::setReadPreference — Set the read preference for this command
$read_preference
[, array $tags
] )read_preference
読み込みの優先モード。MongoClient::RP_PRIMARY
、MongoClient::RP_PRIMARY_PREFERRED
、MongoClient::RP_SECONDARY
、MongoClient::RP_SECONDARY_PREFERRED
あるいは MongoClient::RP_NEAREST
のいずれか。
tags
ゼロ個以上のタグセットの配列。各タグセット自体も配列で、レプリカセットのメンバーのタグにマッチさせる条件として使います。
Returns this cursor.
パラメータが無効な場合、あるいは優先読み込みモードが MongoClient::RP_PRIMARY
のときにタグセットを指定した場合に E_WARNING
が発生します。
例1 MongoCommandCursor::setReadPreference() tag set array syntax example
<?php
$m = new MongoClient('mongodb://rs1.example.com:27017', array('replicaSet' => 'myReplSetName'));
$collection = $m->selectCollection('test', 'people');
$cursor = $collection->aggregateCursor( [
[ '$group' => [ '_id' => '$name', 'points' => [ '$sum' => '$points' ] ] ],
[ '$sort' => [ 'points' => -1 ] ],
] );
// Prefer the nearest server in the "east" data center also used for reporting,
// but fall back to a server in the "west" data center
$cursor->setReadPreference(MongoClient::RP_NEAREST, [
[ 'dc' => 'east', 'use' => 'reporting' ],
[ 'dc' => 'west' ],
] );
foreach ($cursor as $person) {
// ...
}
// If the read preference is changed, it will be used the next time the cursor
// is rewound and the command is re-executed.
$cursor->setReadPreference(MongoClient::RP_PRIMARY);
foreach ($cursor as $person) {
// ...
}
?>