# MongoWriteBatch::execute

(PECL mongo >= 1.5.0)

MongoWriteBatch::execute — Executes a batch of write operations

### Description

final public MongoWriteBatch::execute ( array `$write_options` ) : array

Executes the batch of write operations.

### Parameters

`write_options`

  See MongoWriteBatch::__construct.

### Return Values

Returns an array containing statistical information for the full batch. If the batch had to be split into multiple batches, the return value will aggregate the values from individual batches and return only the totals.

If the batch was empty, an array containing only the 'ok' field is returned (as `TRUE`) although nothing will be shipped over the wire (NOOP).

Array key | Value meaning | Returned for batch type
--- | --- | ---
nInserted | Number of inserted documents | MongoWriteBatch::COMMAND_INSERT batch
nMatched | Number of documents matching the query criteria | MongoWriteBatch::COMMAND_UPDATE batch
nModified | Number of documents actually needed to be modied | MongoWriteBatch::COMMAND_UPDATE batch
nUpserted | Number of upserted documents | MongoWriteBatch::COMMAND_UPDATE batch
nRemoved | Number of documents removed | MongoWriteBatch::COMMAND_DELETE batch
ok | Command success indicator | All

### Errors/Exceptions

A MongoWriteConcernException exception is thrown on failure.

### Examples

Example #1 MongoWriteBatch::add() example

Batching up multiple insert operations

`<?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);
?>`

The above example will output:

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

Example #2 MongoWriteBatch::add() example

Batching up multiple update operations

`<?php
$mc = new MongoClient("localhost");
$collection = $mc->selectCollection("test", "test");
$item1 = array(
"q" => array("my" => "demo"),
"u" => array('$set' => array("try" => 1)),
"multi" => false, /* default value */
"upsert" => false, /* default value */
);
$item2 = array(
"q" => array("is" => "working"),
"u" => array('$set' => array("try" => 2)),
"multi" => true,
);
$item3 = array(
"q" => array("created" => "new-document"),
"u" => array('$set' => array("try" => 3)),
"upsert" => true,
);
$batch = new MongoUpdateBatch($collection);
$batch->add($item1);
$batch->add($item2);
$batch->add($item3);
$retval = $batch->execute(array("w" => 1));
var_dump($retval);
?>`

The above example will output:

    array(4) {
      ["nMatched"]=>
      int(18)
      ["nModified"]=>
      int(2)
      ["nUpserted"]=>
      int(0)
      ["ok"]=>
      bool(true)
    }

Example #3 MongoWriteBatch::add() example

Batching up multiple delete operations

`<?php
$mc = new MongoClient("localhost");
$collection = $mc->selectCollection("test", "test");
$item1 = array(
"q" => array("my" => "demo"),
"limit" => 1,
);
$item2 = array(
"q" => array("try" => 3),
"limit" => 1,
);
$batch = new MongoDeleteBatch($collection);
$batch->add($item1);
$batch->add($item2);
$retval = $batch->execute(array("w" => 1));
var_dump($retval);
?>`

The above example will output:

    array(2) {
      ["nRemoved"]=>
      int(1)
      ["ok"]=>
      bool(true)
    }