Course – LSD (cat=Persistence)

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1. Introduction

When it comes to working with databases in Java applications, we’ve various options available. JDBC, R2DBC, Spring JDBC, and Spring Data JDBC are among the most popular frameworks for interacting with databases. Each framework offers unique features and benefits for efficiently handling database operations.

In this quick tutorial, we’ll dive into the world of database connectivity frameworks and explore how each one brings its unique strengths to the table. From traditional JDBC to cutting-edge R2DBC and everything in between, we’ll unravel their inner workings and compare their features side by side to choose the right tool.


JDBC (Java database connectivity) is the oldest and most widely used standard for accessing databases in Java. It offers a set of interfaces and classes to execute SQL queries, retrieve results, and perform other database operations.

Its strength lies in its ability to efficiently handle simple and complex database operations. Furthermore, it remains a go-to framework because of its widespread acceptance, reliability, and versatility in managing database connections and queries.

One of the limitations of JDBC is that it uses a blocking I/O model, which can cause performance problems if there are a lot of concurrent requests.

3. R2DBC

Unlike JDBC, R2DBC (Reactive Relational Database Connectivity) uses reactive streams and a non-blocking I/O model to handle database operations. This combination of reactivity and non-blocking I/O makes it highly suitable for concurrent systems.

R2DBC can be used in modern reactive programming frameworks such as RxJava and Reactor. It supports both transactional and non-transactional operations.

R2BC is a newer technology. Therefore, not all databases support it. In addition, the available drivers might vary depending on the database we’re using. Moreover, it also has a steep learning curve.

3. Spring JDBC

Spring JDBC is a lightweight abstraction layer on top of JDBC. It simplifies database access by providing a higher-level API and handling many common tasks, such as connection management and exception handling. In addition, it reduces boilerplate code by efficiently managing repetitive tasks by providing parameterized queries and mapping query results to Java objects.

A significant benefit of Spring JDBC is its seamless integration with other Spring components and frameworks.

Because it relies on the blocking IO model of JDBC, it may limit scalability in highly concurrent systems. Moreover, it falls short in terms of the set of features when compared to other frameworks, namely Hibernate.

4. Spring Data JDBC

One more database access tool offered by the Spring ecosystem is Spring Data JDBC. Compared to JDBC and R2DBC, it follows a repository-style approach for database interactions.

Spring Data JDBC is an automatic choice for applications that value simplicity in both domain and code generation. It plays well with domain-driven design and offers support for mapping domain objects to database tables using annotations and conventions. Other than mapping Java objects to database tables, it also provides easy-to-use repository interfaces for common CRUD operations.

Spring Data JDBC is a relatively new framework, and as such, it doesn’t have the same level of maturity as other frameworks. For example, it doesn’t offer much support for complex queries, so we have to write queries ourselves. Additionally, it doesn’t support transactions, which can be a problem in some cases.

5. Comparison

Ultimately, the best choice among JDBC, R2DBC, Spring JDBC, and Spring Data JDBC depends on specific requirements. However, the nature of the application may also play a role in the decision.

The following table can help us to make a decision:

Feature JDBC R2DBC Spring JDBC Spring Data JDBC
API Low level Low level High level High level
Performance Good Excellent Good Good
Communication Synchronous Reactive Synchronous Asynchronous
Maturity Mature Newer Mature Newer
Features Fewer features Few features More features More features
Ease of use Easy Moderate Easy Easy
Support Widespread Growing Widespread Growing

6. Conclusion

In this article, we’ve looked at several database approaches in the Java ecosystem.

For a traditional, synchronous, and widely supported approach, JDBC or Spring JDBC might be the right choice. Similarly, for a reactive application with non-blocking database access, R2DBC could be a good fit. In the last, for simplicity and a higher level of abstraction, Spring Data JDBC might be the ideal option.

By understanding the strengths and weaknesses of each framework, we can make a decision that best suits application needs and helps to build robust, scalable, and maintainable database access code.

Course – LSD (cat=Persistence)

Get started with Spring Data JPA through the reference Learn Spring Data JPA course:

res – Persistence (eBook) (cat=Persistence)
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