Spring声明式事务

@Configuration
@EnableTransactionManagement
public class RootConfig {
}

@Bean  
public DataSourceTransactionManager dataSourceTransactionManager(DataSource dataSource) {  
    DataSourceTransactionManager manager = new DataSourceTransactionManager();  
    manager.setDataSource(dataSource);  
    return manager;  
}

@Transactional  
public void insertUser(User user) throws UsernameDuplicatedException {  
    if(this.validateUsernameDuplicated(user.getUsername())) {  
        userMapper.insertUserBasicInfo(user);  
        userMapper.insertUserAuthority(user.getId(), user.getAuthority());  
    } else {  
        throw new UsernameDuplicatedException("Username : [" + user.getUsername() + "] has existed in database.");  
    }  
}