Database batch insert data

application.properties Modify the connection information of China configuration database ：

spring.datasource.username=root
spring.datasource.password=root
// Pay attention to Parameters parameters  rewriteBatchedStatements Configuration of 
spring.datasource.url=jdbc:mysql:///db?serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true

// Implementation layer  
@Service
public class UserService extends ServiceImpl<UserMapper, User> implements IUserService {
    
    private static final Logger logger = LoggerFactory.getLogger(UserService.class);
    @Autowired
    UserMapper userMapper;
    @Autowired
    SqlSessionFactory sqlSessionFactory;

    @Transactional(rollbackFor = Exception.class)
    public void addUserOneByOne(List<User> users) {
    
    // Although it is inserted one by one , But only one sqlsession
        SqlSession session = sqlSessionFactory.openSession(ExecutorType.BATCH);
        UserMapper um = session.getMapper(UserMapper.class);
        long startTime = System.currentTimeMillis();
        for (User user : users) {
    
            um.addUserOneByOne(user);
        }
        session.commit();
        long endTime = System.currentTimeMillis();
        logger.info(" Insert... One by one  SQL  Time consuming  {}", (endTime - startTime));
    }
}