Spring Boot Configuration and Utilization of Two Data Sources
Problem:
How can multiple data sources be configured and utilized in a Spring Boot application?
Solution:
Application Configuration
Modify the application.properties file to include the settings for an additional data source. For example:
#first db spring.datasource.url = [url] spring.datasource.username = [username] spring.datasource.password = [password] spring.datasource.driverClassName = oracle.jdbc.OracleDriver #second db spring.secondDatasource.url = [url] spring.secondDatasource.username = [username] spring.secondDatasource.password = [password] spring.secondDatasource.driverClassName = oracle.jdbc.OracleDriver
Spring Bean Configuration
In a class annotated with @Configuration, create methods with the @Bean annotation to define the data source instances. Specify the @Primary annotation to indicate the primary data source. For example:
@Bean @Primary @ConfigurationProperties(prefix = "spring.datasource") public DataSource primaryDataSource() { return DataSourceBuilder.create().build(); } @Bean @ConfigurationProperties(prefix = "spring.secondDatasource") public DataSource secondaryDataSource() { return DataSourceBuilder.create().build(); }
Repository Autowiring
Autowire the desired data source in the repository class using the @Qualifier annotation. For example:
@Repository public class ExampleRepository { @Autowired @Qualifier("secondaryDataSource") private DataSource dataSource; // Operations using the secondary data source }
By following these steps, you can configure and use multiple data sources in a Spring Boot application, enabling you to connect to and manage different data sources within your system.
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