使用Spring Data JPA提交事务

Question

I downloaded a Spring Data JPA example from here Accessing Data with JPA and it works as expected.

@SpringBootApplication
public class Application {

  private static final Logger log = LoggerFactory.getLogger(Application.class);

  public static void main(String[] args) {
    SpringApplication.run(Application.class);
  }

  @Bean
  public CommandLineRunner demo(CustomerRepository repository) {
    return (args) -> {
      // save a couple of customers
      repository.save(new Customer("Jack", "Bauer"));
      repository.save(new Customer("Chloe", "O'Brian"));
      repository.save(new Customer("Kim", "Bauer"));
      repository.save(new Customer("David", "Palmer"));
      repository.save(new Customer("Michelle", "Dessler"));

      // fetch all customers
      log.info("Customers found with findAll():");
      log.info("-------------------------------");
      for (Customer customer : repository.findAll()) {
        log.info(customer.toString());
      }
      log.info("");

      // fetch an individual customer by ID
      Customer customer = repository.findOne(1L);
      log.info("Customer found with findOne(1L):");
      log.info("--------------------------------");
      log.info(customer.toString());
      log.info("");

      // fetch customers by last name
      log.info("Customer found with findByLastName('Bauer'):");
      log.info("--------------------------------------------");
      for (Customer bauer : repository.findByLastName("Bauer")) {
        log.info(bauer.toString());
      }
      log.info("");
    };
  }

}

Then I tried to change from In-Memory database to a real one. For this I added in the current directory an application.properties file with a single line:

spring.datasource.url=jdbc:h2:C:/users/semaphor/H2Database;DB_CLOSE_ON_EXIT=FALSE

Now when I run the application, I can see that in the expected directory the database file is created.

Now I want to see that the customers are stored in the database and are still there when I restart the application. So I removed some lines where customers were saved in the database at the beginning but they are then not listen with findAll() .

I suppose this transaction is not commited but I can't figure out how I can do this. Adding simply the annotation @EnableTranscationManagement to the Application class and @Transactional to the demo() method is not the solution.

What do I have to add to commit the transaction (if that is really the problem)?

Answer 1

See M. Deinum's comment below the question.

Adding

spring.jpa.hibernate.ddl-auto=update

to the application.properties was the solution.