The MongoWriteBatch class

(PECL mongo >=1.5.0)

Einführung

MongoWriteBatch is the base class for the MongoInsertBatch, MongoUpdateBatch and MongoDeleteBatch classes.

MongoWriteBatch allows you to "batch up" multiple operations (of same type) and shipping them all to MongoDB at the same time. This can be especially useful when operating on many documents at the same time to reduce roundtrips.

Prior to version 1.5.0 of the driver it was possible to use MongoCollection::batchInsert(), however, as of 1.5.0 that method is now discouraged.

Note: This class is only available when talking to MongoDB 2.6.0 (and later) servers. It will throw MongoProtocolException if attempting to use it on older MongoDB servers.

Klassenbeschreibung

MongoWriteBatch {
/* Konstanten */
const int COMMAND_INSERT = 1 ;
const int COMMAND_UPDATE = 2 ;
const int COMMAND_DELETE = 3 ;
/* Methoden */
protected __construct ( MongoCollection $collection [, string $batch_type [, array $write_options ]] )
public add ( array $item ) : bool
final public execute ( array $write_options ) : array
}

MongoWriteBatch types

MongoWriteBatch::COMMAND_INSERT

Create an Insert Write Batch

MongoWriteBatch::COMMAND_UPDATE

Create an Update Write Batch

MongoWriteBatch::COMMAND_DELETE

Create an Delete Write Batch

Beschreibung

When executing a batch by calling MongoWriteBatch::execute(), MongoWriteBatch will send up to maxWriteBatchSize (defaults to 1000) documents or maxBsonObjectSize (defaults to 16777216 bytes), whichever comes first.

Hinweis:

Documents will never be partially transferred. When adding documents to the batch, that overflows the limit, a new batch will be created and the document put into the new batch.

Fehler/Exceptions

Beispiele

Beispiel #1 MongoWriteBatch example

Adding documents to a Insert batch and then execute it

<?php
$mc = new MongoClient("localhost");

$collection = $mc->selectCollection("test", "test");


$docs = array();
$docs[] = array("my" => "demo");
$docs[] = array("is" => "working");
$docs[] = array("pretty" => "well");

$batch = new MongoInsertBatch($collection);
foreach($docs as $document) {
    $batch->add($document);
}
$retval = $batch->execute(array("w" => 1));
var_dump($retval);
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

array(2) {
  ["nInserted"]=>
  int(3)
  ["ok"]=>
  bool(true)
}

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