The primary goal of the 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 MongoDB 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.
This project is governed by the Spring Code of Conduct. By participating, you are expected to uphold this code of conduct. Please report unacceptable behavior to [email protected].
Here is a quick teaser of an application using Spring Data Repositories in 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("Gierke");
repository.save(person);
List<Person> lastNameResults = repository.findByLastname("Gierke");
List<Person> firstNameResults = repository.findByFirstnameLike("Oli*");
}
}
@Configuration
@EnableMongoRepositories
class ApplicationConfig extends AbstractMongoClientConfiguration {
@Override
protected String getDatabaseName() {
return "springdata";
}
}Add the Maven dependency:
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
<version>${version}</version>
</dependency>If you’d rather like the latest snapshots of the upcoming major version, use our Maven snapshot repository and declare the appropriate dependency version.
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
<version>${version}-SNAPSHOT</version>
</dependency>
<repository>
<id>spring-snapshot</id>
<name>Spring Snapshot Repository</name>
<url>https://repo.spring.io/snapshot</url>
</repository>The 4.0 MongoDB Java Driver does no longer support certain features that have already been deprecated in one of the last minor versions. Some of the changes affect the initial setup configuration as well as compile/runtime features. We summarized the most typical changes one might encounter.
| Element / Attribute | 2.x | 3.x |
|---|---|---|
|
Used to create a |
Now exposes a |
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Was a comma delimited list of replica set members (host/port) |
Now defines the replica set name. |
|
NONE, NORMAL, SAFE, FSYNC_SAFE, REPLICAS_SAFE, MAJORITY |
W1, W2, W3, UNAKNOWLEDGED, AKNOWLEDGED, JOURNALED, MAJORITY |
| Element / Attribute | Replacement in 3.x | Comment |
|---|---|---|
|
|
Referencing a |
|
|
Single authentication data instead of list. |
|
|
See |
| Element | Comment |
|---|---|
|
Replacement for |
|
Replacement for |
|
Replacement for |
|
Namespace element for |
| Type | Comment |
|---|---|
|
Creates |
|
Uses |
|
Uses |
|
Uses |
|
Now produces |
| 2.x | Replacement in 3.x | Comment |
|---|---|---|
|
|
Creating a |
|
|
Using |
|
- |
- |
|
|
|
|
|
Returns |
|
The MongoDB UUID representation can now be configured with different formats.
This has to be done via MongoClientSettings as shown in the snippet below.
static class Config extends AbstractMongoClientConfiguration {
@Override
public void configureClientSettings(MongoClientSettings.Builder builder) {
builder.uuidRepresentation(UuidRepresentation.STANDARD);
}
// ...
}Having trouble with Spring Data? We’d love to help!
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Check the reference documentation, and Javadocs.
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Learn the Spring basics – Spring Data builds on Spring Framework, check the spring.io web-site for a wealth of reference documentation. If you are just starting out with Spring, try one of the guides.
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If you are upgrading, check out the changelog for “new and noteworthy” features.
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Ask a question - we monitor stackoverflow.com for questions tagged with
spring-data-mongodb. You can also chat with the community on Gitter. -
Report bugs with Spring Data MongoDB at github.com/spring-projects/spring-data-mongodb/issues.
Spring Data uses Github as issue tracking system to record bugs and feature requests. If you want to raise an issue, please follow the recommendations below:
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Before you log a bug, please search the issue tracker to see if someone has already reported the problem.
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If the issue does not already exist, create a new issue.
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Please provide as much information as possible with the issue report, we like to know the version of Spring Data that you are using, the JVM version, Stacktrace, etc.
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If you need to paste code, or include a stack trace use Markdown code fences ```.
The spring.io site contains several guides that show how to use Spring Data step-by-step:
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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.
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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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Spring Data Examples contains example projects that explain specific features in more detail.
You do not need to build from source to use Spring Data. Binaries are available in repo.spring.io and accessible from Maven using the Maven configuration noted above.
|
Note
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Configuration for Gradle is similar to Maven. |
The best way to get started is by creating a Spring Boot project using MongoDB on start.spring.io. Follow this link to build an imperative application and this link to build a reactive one.
However, if you want to try out the latest and greatest, Spring Data MongoDB can be easily built with the Maven wrapper and minimally, JDK 8 (JDK downloads).
In order to build Spring Data MongoDB, you will need to download and install a MongoDB distribution.
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 MongoDB Replica Set is required.
To run the MongoDB server enter the following command from a command-line:
$ $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:
$ $MONGODB_HOME/bin/mongo
MongoDB server version: 5.0.0
...Then enter the following command:
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):
$ ulimit -n 32768You can use ulimit -a again to verify the ulimit for "open files" was set appropriately.
Now you are ready to build Spring Data MongoDB. Simply enter the following mvnw (Maven Wrapper) command:
$ ./mvnw clean installIf you want to build with the regular mvn command, you will need Maven v3.5.0 or above.
Also see CONTRIBUTING.adoc if you wish to submit pull requests, and in particular, please sign the Contributor’s Agreement before your first non-trivial change.
Spring Data MongoDB is Open Source software released under the Apache 2.0 license.