How to configure multiple data sources in SpringBoot?

To configure multiple data sources in SpringBoot, you can follow these steps:

Configure data source information in the application.properties or application.yml file, for example:

# 第一个数据源
spring.datasource.url=jdbc:mysql://localhost:3306/db1
spring.datasource.username=user1
spring.datasource.password=password1
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

# 第二个数据源
custom.datasource.url=jdbc:mysql://localhost:3306/db2
custom.datasource.username=user2
custom.datasource.password=password2
custom.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

Create configuration classes for two data sources, configuring them using the @Configuration and @Bean annotations, for example:

@Configuration
public class DataSourceConfig {

    @Primary
    @Bean(name = "dataSource")
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "customDataSource")
    @ConfigurationProperties(prefix = "custom.datasource")
    public DataSource customDataSource() {
        return DataSourceBuilder.create().build();
    }
}

3. Use the @Qualifier annotation to specify the name of the data source where it is needed.

@Service
public class UserService {

    @Autowired
    @Qualifier("dataSource")
    private DataSource dataSource;

    @Autowired
    @Qualifier("customDataSource")
    private DataSource customDataSource;
}

You can configure multiple data sources in Spring Boot and specify a specific data source where needed by following the steps above.