Spring Boot中的多個事務管理器，用於不同的EntityManager

Question

我需要從一個應用程序連接到兩個不同的數據庫。 問題是我的appEntityManager沒有與之關聯的事務管理器，我不確定該怎么做。 該@Primary adminEntityManager能夠描述使用彈簧啟動提供一個沒有任何麻煩這里 。

上面的配置幾乎可以獨立工作。 為了完成圖片，您還需要為兩個EntityManager配置TransactionManager。 如果您將其中之一標記為@Primary，則可以由Spring Boot中的默認JpaTransactionManager拾取。 另一個必須顯式地注入到新實例中。 或者，您也許可以使用跨這兩者的JTA事務管理器。

我已經用

@EnableTransactionManagement

這是美味的豆子

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

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

@Bean
public LocalContainerEntityManagerFactoryBean appEntityManagerFactory(
        final EntityManagerFactoryBuilder builder) {
    return builder
            .dataSource(appDataSource())
            .packages("au.com.mycompany.app.bomcommon.domain")
            .persistenceUnit("appPersistentUnit")
            .build();
}

@Bean
@Primary
public LocalContainerEntityManagerFactoryBean adminEntityManagerFactory(
        final EntityManagerFactoryBuilder builder) {
    return builder
            .dataSource(adminDataSource())
            .packages("au.com.mycompany.app.bombatch")
            .persistenceUnit("adminPersistentUnit")
            .build();
}

//I thought this would do it but I am getting an exception
//No qualifying bean of type [org.springframework.transaction.PlatformTransactionManager] is defined: expected single matching bean but found 2: appTransactionManager,transactionManager
@Bean
public JpaTransactionManager appTransactionManager(@Qualifier("appEntityManagerFactory") final EntityManagerFactory emf) {
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);
    return transactionManager;
}

更新資料

我最終以不同的方式做了。 看這里 。

Answer 1

查看是否可行：

@Bean
@Primary
@ConfigurationProperties(prefix = "datasource.admin")
public DataSource adminDS() { ... }

@Bean
@Primary
public LocalContainerEntityManagerFactoryBean adminEMF(...) { ... }

@Bean
@Primary
public JpaTransactionManager adminTM(...) { ... }

@Bean
public LocalContainerEntityManagerFactoryBean appEMF(...) { ... }

@Bean
public JpaTransactionManager appTM(...) { ... }

我對您的配置所做的唯一更改是為管理員端顯式聲明了一個事務管理器，並將該事務管理器標記為默認值。

Answer 2

請參閱以下更改。 這個對我有用。 創建了3個數據源，3個會話工廠和3個事務管理器。 如下將這些事務管理器添加到chainedTransaction中：

                    @Configuration
                    @EnableTransactionManagement
                    public class HibernateConfiguration implements TransactionManagementConfigurer {


                        @Bean("chainedTransactionManager")
                        public PlatformTransactionManager transactionManager(
                                @Qualifier("transactionManager1") final HibernateTransactionManager transactionManager1,
                                @Qualifier("transactionManager2") final HibernateTransactionManager transactionManager2,
                                @Qualifier("transactionManager3") final HibernateTransactionManager transactionManager3) {

                            return new ChainedTransactionManager(transactionManager1, transactionManager2, transactionManager3);
                        }

                        @Override
                        public PlatformTransactionManager annotationDrivenTransactionManager() {
                            // TODO Auto-generated method stub
                            return transactionManager(oneTransactionManager(), twoTransactionManager(), threeTransactionManager());
                        }


                @Bean(name = "oneDataSource", destroyMethod="")
                      public DataSource oneDataSource() throws IllegalArgumentException, NamingException, SQLException {
                            HikariConfig hkConfig = new HikariConfig();
                            System.out.println(env.getRequiredProperty("spring1-datasource.jdbcUrl"));
                            hkConfig.setJdbcUrl(env.getRequiredProperty("spring1-datasource.jdbcUrl"));
                            hkConfig.setUsername(env.getRequiredProperty("spring1-datasource.username"));
                            hkConfig.setPassword(env.getRequiredProperty("spring1-datasource.password"));
                            hkConfig.setDriverClassName(env.getRequiredProperty("spring1-datasource.driverClassName"));
                            return new HikariDataSource(hkConfig);
                        }

                @Bean(name="oneSessionFactory")
                @Qualifier("oneSessionFactory") 
               public LocalSessionFactoryBean oneSessionFactory() throws IllegalArgumentException, NamingException, SQLException {
                LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
                sessionFactory.setDataSource(oneDataSource());
                  sessionFactory.setPackagesToScan(env.getRequiredProperty("entitymanager.packagesToScan"));
                  Properties hibernateProperties = new Properties();
                  hibernateProperties.put("hibernate.dialect", env.getRequiredProperty("hibernate.dialect"));
                  hibernateProperties.put("hibernate.show_sql", env.getRequiredProperty("hibernate.show_sql"));
                  sessionFactory.setHibernateProperties(hibernateProperties);
                return sessionFactory;

              }



        @Bean(name="transactionManager1")
          public HibernateTransactionManager oneTransactionManager() {
              HibernateTransactionManager oneTransactionManager = new HibernateTransactionManager();
              try {
                oneTransactionManager.setSessionFactory(oneSessionFactory().getObject());
                } catch (IllegalArgumentException | NamingException | SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
              return oneTransactionManager 
          }





    @Bean(name = "twoDataSource", destroyMethod="")
          public DataSource twoDataSource() throws IllegalArgumentException, NamingException, SQLException {
                HikariConfig hkConfig = new HikariConfig();
                System.out.println(env.getRequiredProperty("spring2-datasource.jdbcUrl"));
                hkConfig.setJdbcUrl(env.getRequiredProperty("spring2-datasource.jdbcUrl"));
                hkConfig.setUsername(env.getRequiredProperty("spring2-datasource.username"));
                hkConfig.setPassword(env.getRequiredProperty("spring2-datasource.password"));
                hkConfig.setDriverClassName(env.getRequiredProperty("spring2-datasource.driverClassName"));
                return new HikariDataSource(hkConfig);
            }



@Bean(name="twoSessionFactory")
    @Qualifier("twoSessionFactory") 
   public LocalSessionFactoryBean twoSessionFactory() throws IllegalArgumentException, NamingException, SQLException {
    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
    sessionFactory.setDataSource(twoDataSource());
      sessionFactory.setPackagesToScan(env.getRequiredProperty("entitymanager.packagesToScan"));
      Properties hibernateProperties = new Properties();
      hibernateProperties.put("hibernate.dialect", env.getRequiredProperty("hibernate.dialect"));
      hibernateProperties.put("hibernate.show_sql", env.getRequiredProperty("hibernate.show_sql"));
      sessionFactory.setHibernateProperties(hibernateProperties);
    return sessionFactory;

  }





  @Bean(name="transactionManager2")
  public HibernateTransactionManager twoTransactionManager() {
      HibernateTransactionManager twoTransactionManager = new HibernateTransactionManager();
      try {
        twoTransactionManager.setSessionFactory(twoSessionFactory().getObject());
        } catch (IllegalArgumentException | NamingException | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
      return twoTransactionManager
  }


@Bean(name = "threeDataSource", destroyMethod="")
      public DataSource threeDataSource() throws IllegalArgumentException, NamingException, SQLException {
            HikariConfig hkConfig = new HikariConfig();
            System.out.println(env.getRequiredProperty("spring3-datasource.jdbcUrl"));
            hkConfig.setJdbcUrl(env.getRequiredProperty("spring3-datasource.jdbcUrl"));
            hkConfig.setUsername(env.getRequiredProperty("spring3-datasource.username"));
            hkConfig.setPassword(env.getRequiredProperty("spring3-datasource.password"));
            hkConfig.setDriverClassName(env.getRequiredProperty("spring3-datasource.driverClassName"));
            return new HikariDataSource(hkConfig);
        }


    @Bean(name="threeSessionFactory")
    @Qualifier("threeSessionFactory") 
   public LocalSessionFactoryBean threeSessionFactory() throws IllegalArgumentException, NamingException, SQLException {
    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
    sessionFactory.setDataSource(threeDataSource());
      sessionFactory.setPackagesToScan(env.getRequiredProperty("entitymanager.packagesToScan"));
      Properties hibernateProperties = new Properties();
      hibernateProperties.put("hibernate.dialect", env.getRequiredProperty("hibernate.dialect"));
      hibernateProperties.put("hibernate.show_sql", env.getRequiredProperty("hibernate.show_sql"));
      sessionFactory.setHibernateProperties(hibernateProperties);
    return sessionFactory;

  }





  @Bean(name="transactionManager3")
  public HibernateTransactionManager threeTransactionManager() {
      HibernateTransactionManager threeTransactionManager = new HibernateTransactionManager();
      try {
        threeTransactionManager.setSessionFactory(threeSessionFactory().getObject());
        } catch (IllegalArgumentException | NamingException | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
      return threeTransactionManager
  }

                           }