= Spring Data MongoDB image:https://img.shields.io/badge/Revved%20up%20by-Develocity-06A0CE?logo=Gradle&labelColor=02303A["Revved up by Develocity", link="https://ge.spring.io/scans?search.rootProjectNames=Spring Data MongoDB"]

The primary goal of the https://spring.io/projects/spring-data[Spring Data] project is to make it easier to build Spring-powered applications that use new data access technologies such as non-relational databases, map-reduce frameworks, and cloud based data services.

The Spring Data project aims to provide a familiar and consistent Spring-based programming model for new datastores while retaining store-specific features and capabilities.
The Spring Data MongoDB project provides integration with the MongoDB document database.
Key functional areas of Spring Data MongoDB are a POJO centric model for interacting with a MongoDB `+Document+` and easily writing a repository style data access layer.

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[[getting-started]]
== Getting Started

Here is a quick teaser of an application using Spring Data Repositories in Java:

[source,java]
----
public interface PersonRepository extends CrudRepository<Person, Long> {

  List<Person> findByLastname(String lastname);

  List<Person> findByFirstnameLike(String firstname);
}

@Service
public class MyService {

  private final PersonRepository repository;

  public MyService(PersonRepository repository) {
    this.repository = repository;
  }

  public void doWork() {

    repository.deleteAll();

    Person person = new Person();
    person.setFirstname("Oliver");
    person.setLastname("Drotbohm");
    repository.save(person);

    List<Person> lastNameResults = repository.findByLastname("Drotbohm");
    List<Person> firstNameResults = repository.findByFirstnameLike("Oli*");
 }
}

@Configuration
@EnableMongoRepositories
class ApplicationConfig extends AbstractMongoClientConfiguration {

  @Override
  protected String getDatabaseName() {
    return "springdata";
  }
}
----

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[[guides]]
== Guides

The https://spring.io/[spring.io] site contains several guides that show how to use Spring Data step-by-step:

* https://spring.io/guides/gs/accessing-data-mongodb/[Accessing Data with MongoDB] is a very basic guide that shows you how to create a simple application and how to access data using repositories.
* https://spring.io/guides/gs/accessing-mongodb-data-rest/[Accessing MongoDB Data with REST] is a guide to creating a REST web service exposing data stored in MongoDB through repositories.

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[[building-from-source]]
== Building from Source

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[[local-build-environment]]
=== Local Build Environment

In order to build Spring Data MongoDB, you will need to https://www.mongodb.com/try/download/community[download]
and https://docs.mongodb.com/manual/installation/[install a MongoDB distribution] and https://www.docker.com/products/docker-desktop/[Docker].

Once you have installed MongoDB, you need to start a MongoDB server. It is convenient to set an environment variable to
your MongoDB installation directory (e.g. `MONGODB_HOME`).

To run the full test suite, a https://docs.mongodb.com/manual/tutorial/deploy-replica-set/[MongoDB Replica Set]
is required.

To run the MongoDB server enter the following command from a command-line:

[source,bash]
----
$ $MONGODB_HOME/bin/mongod --dbpath $MONGODB_HOME/runtime/data --ipv6 --port 27017 --replSet rs0
...
"msg":"Successfully connected to host"
----

Once the MongoDB server starts up, you should see the message (`msg`), "_Successfully connected to host_".

Notice the `--dbpath` option to the `mongod` command. You can set this to anything you like, but in this case, we set
the absolute path to a sub-directory (`runtime/data/`) under the MongoDB installation directory (in `$MONGODB_HOME`).

You need to initialize the MongoDB replica set only once on the first time the MongoDB server is started.
To initialize the replica set, start a mongo client:

[source,bash]
----
$ $MONGODB_HOME/bin/mongo
MongoDB server version: 8.0.0
...
----

Then enter the following command:

[source,bash]
----
mongo> rs.initiate({ _id: 'rs0', members: [ { _id: 0, host: '127.0.0.1:27017' } ] })
----

Finally, on UNIX-based system (for example, Linux or Mac OS X) you may need to adjust the `ulimit`.
In case you need to, you can adjust the `ulimit` with the following command (32768 is just a recommendation):

[source,bash]
----
$ ulimit -n 32768
----

You can use `ulimit -a` again to verify the `ulimit` for "_open files_" was set appropriately.

=== Running the Build

[source,bash]
----
 $ ./mvnw clean install
----

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