Spring Boot - Same repository and same entity for different databases

Question

I have a Spring Boot project with one entity and one repository associated to this entity. In the repository there is one method with a custom query and in the project contr

Answer 1

Create 2 config files with different datasource and these 2 config files will have different specifications for 2 different jpa repository class.but can have same domain class.

step1> In your properties file have 2 datasource details.

spring.datasource.url=jdbc:postgresql://localhost:5432/DB2017_test
spring.datasource.username=xxx
spring.datasource.password=xxx


# DB2018 DB - ""
spring.datasource2.url=jdbc:postgresql://localhost:5432/DB2018_test
spring.datasource2.username=xxx
spring.datasource2.password=xxx

step2>Then create config file for first dataSource

package com.package1;

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
  entityManagerFactoryRef = "entityManagerFactory",
  basePackages = { "com.package1.repo" } 
)
public class DB2017Config {

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

  @Primary
  @Bean(name = "entityManagerFactory")
  public LocalContainerEntityManagerFactoryBean 
  entityManagerFactory(
    EntityManagerFactoryBuilder builder,
    @Qualifier("dataSource") DataSource dataSource
  ) {
    return builder
      .dataSource(dataSource)
      .packages("com.domain")
      .persistenceUnit("foo")
      .build();
  }

  @Primary
  @Bean(name = "transactionManager")
  public PlatformTransactionManager transactionManager(
    @Qualifier("entityManagerFactory") EntityManagerFactory 
    entityManagerFactory
  ) {
    return new JpaTransactionManager(entityManagerFactory);
  }
}

step3> Similary create another config file for other dataSource,

@EnableJpaRepositories(
  entityManagerFactoryRef = "entityManagerFactory",
  basePackages = { "com.package2.repo" }

And change prefix

@ConfigurationProperties(prefix = "spring.datasource2")

Now you will have 2 similar RequestRepository1 and RequestRepository2 in package1 and package2 respectiverly as mentioned above (basePackages = { "com.package1.repo" }).

step4>All set autowire 2 different repo .

@Autowired
private final RequestRepository1  repo1;
@Autowired
private final RequestRepository2  repo2;

Then use them.

List listAdesioni = repo1.findByCodiceFiscale(codicefiscale);
List listAdesioni = repo2.findByCodiceFiscale(codicefiscale);