How can i connect to 2 different Schemas on one datasource in springboot - spring-boot

Question

I am trying to extract data from multiple databases in different servers. This has been successful after configuring different Data sources as shown in my code however i cannot see to configure 2 different Data sources on the same connection.
I have tried to create 2 beans within the config file but i would still need to set the Data source.
#Configuration
#EnableJpaRepositories(basePackages = {"balances.Repository.World"},
entityManagerFactoryRef = "ASourceEntityManager",transactionManagerRef = "ASourceTransactionManager")
#EnableTransactionManagement
public class World{
#Autowired
private Environment env;
#Bean
public LocalContainerEntityManagerFactoryBean ASourceEntityManager() {
LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setDataSource(ASourceDatasource());
em.setPackagesToScan(new String("balances.Repository.World"));
em.setPersistenceUnitName("ASourceEntityManager");
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
HashMap<String, Object> properties = new HashMap<String, Object>();
properties.put("hibernate.dialect",env.getProperty("app.datasource.ASource.hibernate.dialect"));
properties.put("hibernate.show-sql",env.getProperty("app.datasource.ASource.show-sql"));
em.setJpaPropertyMap(properties);
return em;
}
#Bean
#ConfigurationProperties(prefix = "app.datasource.ASource")
public DataSource ASourceDatasource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(env.getProperty("app.datasource.ASource.driverClassName"));
dataSource.setUrl(env.getProperty("app.datasource.ASource.url"));
dataSource.setUsername(env.getProperty("app.datasource.ASource.username"));
dataSource.setPassword(env.getProperty("app.datasource.ASource.password"));
return dataSource;
}
#ConfigurationProperties(prefix = "app.datasource.ASourceB")
public DataSource ASourceDatasource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(env.getProperty("app.datasource.ASourceB.driverClassName"));
dataSource.setUrl(env.getProperty("app.datasource.ASourceB.url"));
dataSource.setUsername(env.getProperty("app.datasource.ASourceB.username"));
dataSource.setPassword(env.getProperty("app.datasource.ASourceB.password"));
return dataSource;
}
#Bean
public PlatformTransactionManager ASourceTransactionManager() {
JpaTransactionManager transactionManager
= new JpaTransactionManager();
transactionManager.setEntityManagerFactory(
ASourceEntityManager().getObject());
return transactionManager;
}

Answer 1

After some thought i have come up with a workaround that might be a bit hacky but gets the job done.
Instead of declaring a new database connection for the second schema in my app.properties i have used one connection. I placed all my entities in one model package and used a native query to access the other schema. In the native query i would then specify the schema eg:
select * from DATABASE1.Id;
This solution does not scale well as it would create a lot of work when dealing with a large number of entities so if there is a way of specifying the schema in the repository that would also help.
I tried using the entity attributes to define my schema but jpa seems to be ignoring it and prefixing the table with the wrong schema for example if
i annotate my class with the following
#Table(name = "Payment", schema = "DATABASE1", catalog = "")
The resulting query would be "select * from DATABASE2.Payment" instead of
select * from DATABASE1.Payment