# The MongoDB\Driver\BulkWriteCommand class

&reftitle.intro;

`MongoDB\Driver\BulkWriteCommand` collects one or more write operations that should be sent to the server using the bulkWrite command introduced in MongoDB 8.0. After adding any number of insert, update, and delete operations, the command may be executed via `MongoDB\Driver\Manager::executeBulkWriteCommand`.

Unlike `MongoDB\Driver\BulkWrite`, where all write operations must target the same collection, each write operation within `MongoDB\Driver\BulkWriteCommand` may target a different collection.

Write operations may either be ordered (default) or unordered. Ordered write operations are sent to the server, in the order provided, for serial execution. If a write fails, any remaining operations will be aborted. Unordered operations are sent to the server in an arbitrary order where they may be executed in parallel. Any errors that occur are reported after all operations have been attempted.

&reftitle.classsynopsis;

        MongoDB\Driver\BulkWriteCommand

         final

          MongoDB\Driver\BulkWriteCommand

          Countable

        &Methods;

&reftitle.examples;

### Mixed write operations

Mixed write operations (i.e. inserts, updates, and deletes) will be sent to the server using a single bulkWrite command.

    <?php

    $manager = new MongoDB\Driver\Manager;

    $bulk = new MongoDB\Driver\BulkWriteCommand;

    // Delete documents from both collections
    $bulk->deleteMany('db.coll_one', []);
    $bulk->deleteMany('db.coll_two', []);

    // Insert documents into two collections
    $bulk->insertOne('db.coll_one', ['_id' => 1]);
    $bulk->insertOne('db.coll_two', ['_id' => 2]);
    $bulk->insertOne('db.coll_two', ['_id' => 3]);

    // Update a document in "coll_one"
    $bulk->updateOne('db.coll_one', ['_id' => 1], ['$set' => ['x' => 1]]);

    $result = $manager->executeBulkWriteCommand($bulk);

    printf("Inserted %d document(s)\n", $result->getInsertedCount());
    printf("Updated  %d document(s)\n", $result->getModifiedCount());

    ?>

&example.outputs;

    Inserted 3 document(s)
    Updated  1 document(s)

### Ordered write operations causing an error

    <?php

    $manager = new MongoDB\Driver\Manager;

    $bulk = new MongoDB\Driver\BulkWriteCommand;

    $bulk->deleteMany('db.coll', []);
    $bulk->insertOne('db.coll', ['_id' => 1]);
    $bulk->insertOne('db.coll', ['_id' => 2]);
    $bulk->insertOne('db.coll', ['_id' => 1]);
    $bulk->insertOne('db.coll', ['_id' => 3]);

    try {
        $result = $manager->executeBulkWriteCommand($bulk);
    } catch (MongoDB\Driver\Exception\BulkWriteCommandException $e) {
        $result = $e->getPartialResult();

        var_dump($e->getWriteErrors());
    }

    printf("Inserted %d document(s)\n", $result->getInsertedCount());

    ?>

&example.outputs.similar;

    array(1) {
      [3]=>
      object(MongoDB\Driver\WriteError)#5 (4) {
        ["message"]=>
        string(78) "E11000 duplicate key error collection: db.coll index: _id_ dup key: { _id: 1 }"
        ["code"]=>
        int(11000)
        ["index"]=>
        int(3)
        ["info"]=>
        object(stdClass)#6 (0) {
        }
      }
    }
    Inserted 2 document(s)

&reftitle.seealso;

- `MongoDB\Driver\Manager::executeBulkWriteCommand`
- `MongoDB\Driver\BulkWriteCommandResult`
- `MongoDB\Driver\Exception\BulkWriteCommandException`
- `MongoDB\Driver\WriteConcern`
- `MongoDB\Driver\WriteConcernError`
- `MongoDB\Driver\WriteError`

&reference.mongodb.mongodb.driver.entities.bulkwritecommand;