Integrating Spring Boot with MongoDB and Cassandra: A Step by Step Guide

Spring Boot is a popular Java-based framework for building standalone and production-grade web applications. MongoDB and Cassandra are two NoSQL databases that are widely used for data storage in modern applications. In this blog, we will discuss how to integrate Spring Boot with MongoDB and Cassandra.

Integration with MongoDB:

To integrate Spring Boot with MongoDB, we need to add the spring-boot-starter-data-mongodb dependency to our project. This dependency includes all the required dependencies for connecting and working with MongoDB. Once the dependency is added, we need to configure our MongoDB connection properties in the application.properties file.

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=mydatabase

In this configuration, we are specifying the MongoDB server host, port, and the name of the database that we want to connect to. Once the connection properties are configured, we can create a model class for our MongoDB documents and a corresponding repository interface to interact with the database.

@Document(collection = "users")
public class User {
    @Id
    private String id;
    private String name;
    private String email;
    // getters and setters
}

public interface UserRepository extends MongoRepository<User, String> {
    User findByName(String name);
}

In this example, we have defined a User model class with three fields - id, name, and email. The @Document annotation specifies the name of the MongoDB collection that will store these documents. We have also defined a UserRepository interface that extends the MongoRepository interface provided by Spring Data MongoDB. This interface provides us with basic CRUD operations for interacting with the User collection.

Once we have defined our model and repository classes, we can use them in our service classes to perform database operations

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    
    public User getUserByName(String name) {
        return userRepository.findByName(name);
    }
    
    public User saveUser(User user) {
        return userRepository.save(user);
    }
}

In this example, we have defined a UserService class that uses the UserRepository to perform database operations. We have defined two methods - getUserByName() and saveUser() - that retrieve and save User objects from and to the database.

Integration with Cassandra:

To integrate Spring Boot with Cassandra, we need to add the spring-boot-starter-data-cassandra dependency to our project. This dependency includes all the required dependencies for connecting and working with Cassandra. Once the dependency is added, we need to configure our Cassandra connection properties in the application.properties file.

spring.data.cassandra.contact-points=localhost
spring.data.cassandra.port=9042
spring.data.cassandra.keyspace-name=mykeyspace

In this configuration, we are specifying the Cassandra server contact points, port, and the name of the keyspace that we want to connect to. Once the connection properties are configured, we can create a model class for our Cassandra tables and a corresponding repository interface to interact with the database.

@Table("users")
public class User {
    @PrimaryKey
    private UUID id;
    private String name;
    private String email;
    // getters and setters
}

public interface UserRepository extends CassandraRepository<User, UUID> {
    User findByName(String name);
}

This class is annotated with @Table to indicate that it is a Cassandra table. We also annotate the id field with @PrimaryKey to indicate that it is the primary key.

This interface extends the CassandraRepository interface, which provides a set of generic CRUD methods to interact with the database. We can now use this repository to interact with the Cassandra database.

Conclusion:

In this blog, we have explored how to integrate Spring Boot with Cassandra and MongoDB to build a simple CRUD application.

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