如何为多个数据库配置事务管理器

Question

我有一个事务管理器，每个数据库都有多个实体管理器，但是如果有任何失败，它不会访问任何，我该如何解决这个问题？

@Primary
@Bean
    public ChainedTransactionManager transactionManager( ) {
        return new ChainedTransactionManager(
        new JpaTransactionManager(emR01.getEntityManagerFactory()), new
          JpaTransactionManager(emR02.getEntityManagerFactory()), new
          JpaTransactionManager(emR03.getEntityManagerFactory()), new
          JpaTransactionManager(emR04.getEntityManagerFactory()), new
          JpaTransactionManager(emR05.getEntityManagerFactory()), new
          JpaTransactionManager(emR06.getEntityManagerFactory()), new
          JpaTransactionManager(emR07.getEntityManagerFactory()), new
          JpaTransactionManager(emR08.getEntityManagerFactory()), new
          JpaTransactionManager(emR09.getEntityManagerFactory())
         
                );
    }
    

Answer 1

您可以在循环调用以下代码的同时创建多个事务管理器，并为每个人注册一个唯一的 bean

在运行时

public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {

    JpaTransactionManager transactionManager
            = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(entityManagerFactory);
    return transactionManager;
}

bean 注册运行时

AutowireCapableBeanFactory factory = context.getAutowireCapableBeanFactory();

BeanDefinitionRegistry 注册中心 = (BeanDefinitionRegistry) 工厂； registry.removeBeanDefinition("txn01"); context.registerBean("txn01", PlatformTransactionManager.class, () -> transactionManager());