#=====================multiple database config============================
#ds1
first.datasource.url=jdbc:mysql://localhost/test?characterEncoding=utf8&useSSL=true
first.datasource.username=root
first.datasource.password=123456
first.datasource.driver-class-name=com.mysql.jdbc.Driver
first.datasource.type=org.apache.tomcat.jdbc.pool.DataSource
first.datasource.max-wait=10000
first.datasource.max-active=200
first.datasource.test-on-borrow=true
first.datasource.initial-size=10

#ds2
second.datasource.url=jdbc:mysql://localhost/test2?characterEncoding=utf8&useSSL=true
second.datasource.username=root
second.datasource.password=123456
second.datasource.driver-class-name=com.mysql.jdbc.Driver
second.datasource.type=org.apache.tomcat.jdbc.pool.DataSource
second.datasource.max-wait=10000
second.datasource.max-active=200
second.datasource.test-on-borrow=true
second.datasource.initial-size=10

#=====================jpa config================================
#实体类维护数据库表结构的具体行为：update/create/create-drop/validate/none
spring.jpa.hibernate.ddl-auto=none
#打印sql语句
spring.jpa.show-sql=true
#格式化输出的json字符串
spring.jackson.serialization.indent_output=true

/**
 * Created by hdwang on 2017-06-16.
 * 第一个数据源配置
 * If you are using Spring Data, you need to configure @EnableJpaRepositories
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com.hdwang.dao.datajpa.firstDs",entityManagerFactoryRef = "firstEntityManagerFactory",transactionManagerRef="firstTransactionManager")
public class FirstDsConfig {

  /**
   * 数据源配置对象
   * Primary 表示默认的对象，Autowire可注入，不是默认的得明确名称注入
   * @return
   */
  @Bean
  @Primary
  @ConfigurationProperties("first.datasource")
  public DataSourceProperties firstDataSourceProperties() {
    return new DataSourceProperties();
  }

  /**
   * 数据源对象
   * @return
   */
  @Bean
  @Primary
  @ConfigurationProperties("first.datasource")
  public DataSource firstDataSource() {
    return firstDataSourceProperties().initializeDataSourceBuilder().build();
  }

  /**
   * 实体管理对象
   * @param builder 由spring注入这个对象，首先根据type注入（多个就取声明@Primary的对象），否则根据name注入
   * @return
   */
  @Bean
  @Primary
  public LocalContainerEntityManagerFactoryBean firstEntityManagerFactory(
      EntityManagerFactoryBuilder builder) {
    return builder
        .dataSource(firstDataSource())
        .packages("com.hdwang.entity.dbFirst")
        .persistenceUnit("firstDs")
        .build();
  }

  /**
   * 事务管理对象
   * @return
   */
  @Bean(name = "firstTransactionManager")
  @Primary
  public PlatformTransactionManager transactionManager(EntityManagerFactory emf){
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);
    return transactionManager;
  }

  @Bean
  @Primary
  public JdbcTemplate jdbcTemplate(){
    return new JdbcTemplate(firstDataSource());
  }

  @Bean
  @Primary
  public TransactionTemplate transactionTemplate(PlatformTransactionManager platformTransactionManager){
    return new TransactionTemplate(platformTransactionManager);
  }
}

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com.hdwang.dao.datajpa.secondDs", entityManagerFactoryRef = "secondEntityManagerFactory",transactionManagerRef = "secondTransactionManager")
public class SecondDsConfig {

  @Bean
  @ConfigurationProperties("second.datasource")
  public DataSourceProperties secondDataSourceProperties() {
    return new DataSourceProperties();
  }

  @Bean
  @ConfigurationProperties("second.datasource")
  public DataSource secondDataSource() {
    return secondDataSourceProperties().initializeDataSourceBuilder().build();
  }

  /**
   * 实体管理对象
   * @param builder 由spring注入这个对象，首先根据type注入（多个就取声明@Primary的对象），否则根据name注入
   * @return
   */
  @Bean
  public LocalContainerEntityManagerFactoryBean secondEntityManagerFactory(
      EntityManagerFactoryBuilder builder) {
    return builder
        .dataSource(secondDataSource())
        .packages("com.hdwang.entity.dbSecond")
        .persistenceUnit("secondDs")
        .build();
  }

  /**
   * 事物管理对象
   * @param secondEntityManagerFactory 实体管理工厂对象（按照名称注入）
   * @return 平台事物管理器
   */
  @Bean(name = "secondTransactionManager")
  public PlatformTransactionManager transactionManager(@Qualifier("secondEntityManagerFactory")LocalContainerEntityManagerFactoryBean secondEntityManagerFactory){
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(secondEntityManagerFactory.getObject());
    return transactionManager;
  }

  @Bean(name="jdbcTemplate2")
  public JdbcTemplate jdbcTemplate(){
    return new JdbcTemplate(secondDataSource());
  }

  @Bean(name = "transactionTemplate2")
  public TransactionTemplate transactionTemplate(@Qualifier("secondTransactionManager")PlatformTransactionManager transactionManager){
    return new TransactionTemplate(transactionManager);
  }
}

package com.hdwang.dao.datajpa.firstDs;

@Repository
public interface UserRepository extends JpaRepository<User, Integer> {
  /**
   * spring data jpa 会自动注入实现（根据方法命名规范）
   * @return
   */
  User findByNumber(String number);


  @Modifying
  @Query("delete from User u where u.id = :id")
  void deleteUser(@Param("id")int id);
}

package com.hdwang.dao.datajpa.secondDs;

@Repository
public interface OrderRepository extends JpaRepository<Order, Integer> {
  /**
   * spring data jpa 会自动注入实现（根据方法命名规范）
   * @return
   */
  User findByNumber(String number);


  @Modifying
  @Query("delete from Order o where o.id = :id")
  void deleteUser(@Param("id") int id);
}

@Service
@Transactional("firstTransactionManager")
public class UserServiceImpl implements UserService {

  @Autowired
  private UserRepository userRepository;

  @Override
  public User findById(int id) {
    return this.userRepository.findOne(id);
  }

  @Override
  public User findByNumber(String number) {
    return this.userRepository.findByNumber(number);
  }

  @Override
  public List<User> findAllUserByPage(int page,int size) {
    Pageable pageable = new PageRequest(page, size);
    Page<User> users = this.userRepository.findAll(pageable);
    return users.getContent();
  }

  @Override
  public User updateUser(User user,boolean throwEx) {
    User userNew = this.userRepository.save(user);
    if(throwEx){
      throw new RuntimeException("throw a ex");
    }
    return userNew;
  }

  @Override
  public void deleteUser(int id) {
    this.userRepository.deleteUser(id);
  }
}

@Service
@Transactional("secondTransactionManager")
public class OrderServiceImpl implements OrderService {

  @Autowired
  private OrderRepository orderRepository;


  @Override
  public Order findById(int id) {
    return this.orderRepository.findOne(id);
  }

  @Override
  public Order updateOrder(Order order, boolean throwEx) {
    Order orderNew = this.orderRepository.save(order);
    if(throwEx){
      throw new RuntimeException("throw a ex");
    }
    return orderNew;
  }
}