How to Perform Bulk Operations with MongoDB Java Driver
If you want to insert, update, replace, or delete multiple documents in MongoDB using the Java driver, you can use the bulkWrite() method. This method allows you to execute a list of write operations in one call to the database, which can improve performance and reduce network overhead.
In this article, we will show you how to use the bulkWrite() method with different types of write operations, such as insert, update, replace, and delete. We will also explain how to control the order of execution and handle errors.
To follow along with this article, you will need:
A MongoDB database and collection. You can use MongoDB Atlas, a fully managed cloud database service, to create and connect to your database.
The MongoDB Java driver version 4.5 or higher. You can use Maven or Gradle to add the dependency to your project.
An IDE or text editor of your choice.
Creating Write Models
The first step to use the bulkWrite() method is to create a list of write models. A write model is an object that represents a single write operation, such as insert, update, replace, or delete. The MongoDB Java driver provides classes for each type of write model, such as InsertOneModel, UpdateOneModel, ReplaceOneModel, and DeleteOneModel.
To create a write model, you need to pass the document or filter that defines the operation. For example, to create an insert model for a document with an _id of 1 and a name of \"Alice\", you can use the following code:
InsertOneModel insertModel = new InsertOneModel(new Document(\"_id\", 1).append(\"name\", \"Alice\"));
To create an update model for a document with an _id of 2 and set its name to \"Bob\", you can use the following code:
UpdateOneModel updateModel = new UpdateOneModel(Filters.eq(\"_id\", 2), Updates.set(\"name\", \"Bob\"));
To create a replace model for a document with an _id of 3 and replace it with a new document with a name of \"Charlie\", you can use the following code:
ReplaceOneModel replaceModel = new ReplaceOneModel(Filters.eq(\"_id\", 3), new Document(\"name\", \"Charlie\"));
To create a delete model for a document with an _id of 4, you can use the following code:
DeleteOneModel deleteModel = new DeleteOneModel(Filters.eq(\"_id\", 4));
Performing Bulk Operations
Once you have created your write models, you can add them to a list and pass it to the bulkWrite() method. The method returns a BulkWriteResult object that contains information about the outcome of the operation, such as the number of documents inserted, updated, replaced, or deleted.
The following code shows how to perform a bulk operation with the four write models we created in the previous section: