Spring Data JDBC介绍及实现代码

class Customer {
  @Id
  Long id;
  String firstName;
  LocalDate dob;
}

interface CustomerRepository extends CrudRepository<Customer, Long> {}

@Configuration
@EnableJdbcRepositories (1)
public class CustomerConfig extends JdbcConfiguration { (2)

  @Bean
  NamedParameterJdbcOperations operations() { (3)
    return new NamedParameterJdbcTemplate(dataSource());
  }

  @Bean
  PlatformTransactionManager transactionManager() { (4)
    return new DataSourceTransactionManager(dataSource());
 }

  @Bean
  DataSource dataSource(){ (5)
    return new EmbeddedDatabaseBuilder()
        .generateUniqueName(true)
        .setType(EmbeddedDatabaseType.HSQL)
        .addScript("create-customer-schema.sql")
        .build();
  }
}

@RunWith(SpringRunner.class)
@Transactional
@ContextConfiguration(classes = CustomerConfig.class)
public class CustomerRepositoryTest {

  @Autowired CustomerRepository customerRepo;

  @Test
  public void createSimpleCustomer() {

    Customer customer = new Customer();
    customer.dob = LocalDate.of(1904, 5, 14);
    customer.firstName = "Albert";

    Customer saved = customerRepo.save(customer);

    assertThat(saved.id).isNotNull();

    saved.firstName = "Hans Albert";

    customerRepo.save(saved);

    Optional<Customer> reloaded = customerRepo.findById(saved.id);

    assertThat(reloaded).isNotEmpty();

    assertThat(reloaded.get().firstName).isEqualTo("Hans Albert");
  }
}

@Query("select id, first_name, dob from customer where upper(first_name) like '%' || upper(:name) || '%' ")
List<Customer> findByName(@Param("name") String name);

@Test
public void findByName() {

  Customer customer = new Customer();
  customer.dob = LocalDate.of(1904, 5, 14);
  customer.firstName = "Albert";

  Customer saved = customerRepo.save(customer);

  assertThat(saved.id).isNotNull();

  customer.id= null; (1)
  customer.firstName = "Bertram";

  customerRepo.save(customer);

  customer.id= null;
  customer.firstName = "Beth";

  customerRepo.save(customer);

  assertThat(customerRepo.findByName("bert")).hasSize(2); (2)
}