MongoCommandCursor::getReadPreference

(PECL mongo >=1.6.0)

MongoCommandCursor::getReadPreference — Get the read preference for this command

Descrição

public MongoCommandCursor::getReadPreference ( void ) : array

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

This function returns an array describing the read preference. The array contains the values type for the string read preference mode (corresponding to the MongoClient constants), and tagsets containing a list of all tag set criteria. If no tag sets were specified, tagsets will not be present in the array.

Exemplos

Exemplo #1 MongoCommandCursor::getReadPreference() return value example


<?php

$m = new MongoClient('mongodb://rs1.example.com:27017', array('replicaSet' => 'myReplSetName'));
$collection = $m->selectCollection('test', 'people');

// If a MongoCommandCursor is constructed directly, it will inherit the read
// preference of the MongoClient instance passed to its constructor; however,
// MongoCollection::aggregateCursor() will have the MongoCommandCursor inherit
// the collection's read preference.
$collection->setReadPreference(MongoClient::RP_SECONDARY);

$cursor = $collection->aggregateCursor( [
    [ '$group' => [ '_id' => '$name', 'points' => [ '$sum' => '$points' ] ] ],
    [ '$sort' => [ 'points' => -1 ] ],
] );

var_dump($cursor->getReadPreference());

?>

O exemplo acima irá imprimir:

array(1) {
  ["type"]=>
  string(9) "secondary"
}

Veja Também

The read preferences documentation.
MongoCommandCursor::setReadPreference() - Set the read preference for this command
MongoCursorInterface::getReadPreference() - Get the read preference for this query

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