Question

我在Spring上使用mybatis。我有一个执行删除然后插入操作的API。我希望这些操作在一个事务中，以便在插入失败时回滚删除操作。

@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
@MapperScan(basePackages = "com.abc..mapper")
public class ABCCoreDataConfig {

    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean() throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        ....
        .....
        sessionFactory.setMapperLocations(
            new PathMatchingResourcePatternResolver()
                .getResources("classpath*:com/abc//mapper/**/*.xml"));

        return sessionFactory;
    }

    @Bean(name = "transactionManager")
    public PlatformTransactionManager transactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }
}

服务类：

@Service
@Transactional
public class MyService implements IMyService{

  @Autowired
    private MyMapper myMapper;

  @Transactional(propagation = Propagation.REQUIRED)
    public boolean addRecord() throws Exception {
            myMapper.deleteRecord(id);
            myMapper.insertRecord(- - -);
      return true;
    }
}

即使插入因MySQLIntegrityConstraintViolationException而失败，仍然不会恢复删除操作。

注意：删除和插入是映射器级别的两种不同方法。因此，我们在服务层使用了交易。

堆栈跟踪：

23:11:29.452  DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
23:11:29.458  DEBUG org.mybatis.spring.SqlSessionUtils - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7d40dbdb]
23:11:36.685  DEBUG o.m.s.t.SpringManagedTransaction - JDBC Connection [jdbc:mysql://127.0.0.1:13306/abc?connectTimeout=1000, UserName=xyz@10.0.0.0, MySQL Connector Java] will be managed by Spring
23:11:36.690  DEBUG MyDao.delete - ==>  Preparing: DELETE FROM .....
23:11:36.711  DEBUG MyDao.delete - ==> Parameters: ....
23:11:36.807  DEBUG MyDao.delete - <==    Updates: 2
23:11:36.807  DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7d40dbdb]
23:11:36.807  DEBUG org.mybatis.spring.SqlSessionUtils - Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7d40dbdb] from current transaction
23:11:36.832  DEBUG MyDao.insert - ==>  Preparing: INSERT INTO .....
23:11:36.833  DEBUG MyDao.insert - ==> Parameters: ...
23:11:36.927  DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7d40dbdb]
23:11:36.997  DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization deregistering SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7d40dbdb]
23:11:36.998  DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7d40dbdb]

Answer 1

不确定为什么要删除记录，如果可能，重新插入，更新将是更好的选择。这更多地涉及交易的概念，这是一个想法。您可以在mapper类中执行以下操作。

@Transactional(propagation = Propagation.REQUIRED)
public boolean deleteRecord() throws Exception {
// delete code here      
return true;
  }

@Transactional(propagation = Propagation.REQUIRED)
public boolean addRecord() throws Exception {
// add code here      
return true;
  }
}

此处spring注释将处理您的事务。有关更多信息，实际事务使用此处说明的代理概念 Spring - @Transactional - What happens in background?

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