Php/docs/mongocollection.parallelcollectionscan

提供:Dev Guides
< Php
移動先:案内検索

MongoCollection::parallelCollectionScan

(PECL mongo >=1.5.0)

MongoCollection::parallelCollectionScanReturns an array of cursors to iterator over a full collection in parallel


説明

public MongoCollection::parallelCollectionScan ( int $num_cursors ) : array[MongoCommandCursor]

This method returns an array of a maximum of num_cursors cursors. An iteration over one of the returned cursors results in a partial set of documents for a collection. Iteration over all the returned cursors results in getting every document back from the collection.

This method is a wrapper for the parallelCollectionScan MongoDB command.


パラメータ

num_cursors
The number of cursors to request from the server. Please note, that the server can return less cursors than you requested.


返り値

Returns an array of MongoCommandCursor objects.


例1 MongoCollection::parallelCollectionScan() example

Returning all documents in a collection by using multiple cursors.


<?php$m = new MongoClient;$c = $m->demo->cities;/* Request three cursors */$cursors = $c->parallelCollectionScan( 3 );/* Add all the cursors to the MultipleIterator */$mi = new MultipleIterator( MultipleIterator::MIT_NEED_ANY );foreach ( $cursors as $cursor ){    $mi->attachIterator( $cursor );}/* Iterate over all the associated cursors */foreach ( $mi as $items ){    foreach ( $items as $item )    {        if ( $item !== NULL )        {            echo $item['name'], "\n";        }    }}?>

参考