Configure Two DataSources ---

To override the default settings just define a @Bean of your own of type DataSource. Spring Boot provides a utility builder class DataSourceBuilder that can be used to create one of the standard ones (if it is on the classpath), or you can just create your own, and bind it to a set of Environment properties e.g.

@Bean
@ConfigurationProperties(prefix="datasource.mine")
public DataSource dataSource() {
    return new FancyDataSource();
}

datasource.mine.jdbcUrl=jdbc:h2:mem:mydb
datasource.mine.user=sa
datasource.mine.poolSize=30

See Section 28.1, “Configure a DataSource” in the ‘Spring Boot features’ section and the DataSourceAutoConfiguration class for more details.

Creating more than one data source works the same as creating the first one. You might want to mark one of them as @Primary if you are using the default auto-configuration for JDBC or JPA (then that one will be picked up by any @Autowired injections).

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

@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public DataSource secondaryDataSource() {
    return DataSourceBuilder.create().build();
}