Introduction

As a senior PHP and JS web developer, you may be familiar with working on various projects that involve connecting to different databases. In this tutorial, we will explore how to connect to a Cassandra database from a Spring Boot application.

What is Cassandra?

Cassandra is a highly scalable and distributed NoSQL database that is designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.

Setting up the Cassandra Database

Before we can connect to Cassandra from our Spring Boot application, we need to have a Cassandra database up and running. You can install Cassandra locally or use a cloud-based Cassandra service.

Connecting Spring Boot to Cassandra

Now that we have our Cassandra database set up, let’s look at how we can connect our Spring Boot application to it.

1. Add Cassandra Dependencies

First, we need to add the Cassandra dependencies to our pom.xml file:

  ```xml <dependency>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-data-cassandra</artifactId> </dependency>  

2. Configure Cassandra Connection

Next, we need to configure the Cassandra connection in our application.properties file:

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

3. Create a Cassandra Repository

We can now create a Cassandra repository interface that extends CassandraRepository:

  ```java @Repository public interface UserRepository extends CassandraRepository<User, String> { }  

4. Define the Entity Class

We need to define an entity class that represents the data stored in Cassandra:

  ```java @Table public class User {     @PrimaryKey     private String id;     private String name;     private String email;     // Getters and setters }  

5. Use the Repository in Service/Controller

Finally, we can use the UserRepository in our service or controller classes to interact with the Cassandra database:

  ```java @Service public class UserService {     @Autowired     private UserRepository userRepository;     // Use userRepository to perform database operations }  

Conclusion

Connecting to a Cassandra database from a Spring Boot application is straightforward once you have the necessary dependencies and configurations set up. By following the steps outlined in this tutorial, you can easily integrate Cassandra into your Spring Boot projects and leverage its scalability and fault-tolerance features for handling large datasets.