如何使用@Configuration @Beans而不是XML连接DataSourceTransactionManager

Question

用于在Spring中连接事务管理器的典型XML如下所示:

<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="myDataSource" />
</bean>

<bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
    .... properties go here ....
</bean>

如何用代码完成同样的事情？

@Configuration
public class MyConfig {
  @Bean
  public DataSource myDataSource() {
       return new DataSource(); /// and set properties, etc.
  }

  @Bean
  public DataSourceTransactionManager txManager() {
       --> What goes here? <--
  }
}

具体来说,如何通过代码将txManager连接到myDataSource单例？

Answer 1

由于DataSourceTransactionManager有一个构造函数DataSource,你可以执行以下操作(否则你需要调用setDataSource()):

@Bean   
public DataSourceTransactionManager txManager() {
    return new DataSourceTransactionManager(myDataSource());
}

也可以看看:

• 3.11.4.2注入依赖关系

Answer 2

也可以使用多个transactionManager

     @Configuration
        public class MyConfig {
          @Bean
          public DataSource myDataSource1() {
               return new DataSource(); /// and set properties, etc.
          }

          @Bean
          @Qualifier("txManager1")
          public DataSourceTransactionManager txManager1() {
               return new DataSourceTransactionManager(myDataSource1());
          }

          @Bean
          public DataSource myDataSource2() {
               return new DataSource(); /// and set properties, etc.
          }

          @Bean
          @Qualifier("txManager2")
          public DataSourceTransactionManager txManager2() {
             return new DataSourceTransactionManager(myDataSource2());
          }

    }

然后当使用@Transactional时你可以定义你想要的transactionManager：

@Transactional("txManager1")
public Object getSomeData(){
    ...
}

@Transactional("txManager2")
public Object getSomeOtherData(){
    ...
}