The MongoWriteBatch class
(PECL mongo >=1.5.0)
Введение
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.
Обзор классов
$collection
[, string $batch_type
[, array $write_options
]] )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
Описание
When executing a batch, by calling MongoWriteBatch::execute(), MongoWriteBatch will send over » maxWriteBatchSize (defaults to 1000) documents or up to » maxBsonObjectSize (defaults to 16777216 bytes), whichever comes first.
Замечание:
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.
Ошибки
- Exception on parameter parsing failures
- Exception on argument validation errors (e.g. missing keys)
- MongoProtocolException when talking to MongoDB server older then 2.6.0.
- MongoProtocolException on socket errors.
- MongoWriteConcernException when a write fails due to WriteConcerns
Примеры
Пример #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);
?>
Результат выполнения данного примера:
array(2) {
["nInserted"]=>
int(3)
["ok"]=>
bool(true)
}
Содержание
- MongoWriteBatch::add — Adds a write operation to a batch
- MongoWriteBatch::__construct — Creates a new batch of write operations
- MongoWriteBatch::execute — Executes a batch of write operations
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