How to add multiple data sources in the spring boot project?

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In some applications, you might need to connect to multiple databases for various reasons, such as separating read and write operations, integrating with different systems, or migrating data. Configuring multiple data sources in a Spring Boot project allows you to manage these connections efficiently.

Steps to add multiple data sources in a Spring Boot project:

  1. Add Dependencies: Include spring-boot-starter-data-jpa and the necessary database drivers (e.g., MySQL) in your pom.xml or build.gradle.
  2. Configure Data Sources:
  3. In application.properties, configure each data source with properties like spring.datasource.primary.url, spring.datasource.secondary.url, etc.
  4. Create separate configuration classes for each data source, specifying @Bean methods for DataSource, EntityManagerFactory, and TransactionManager.
  5. Use @EnableJpaRepositories with entityManagerFactoryRef and transactionManagerRef to link the repositories with the respective data source.
  6. Create Entities and Repositories: Organize entities and repositories in different packages corresponding to each data source.
  7. Use Data Sources: In your service classes, autowire the repositories and use the appropriate @Transactional annotation with the corresponding TransactionManager.