数据库批量插入数据

application.properties 中配数据库连接信息进行修改：

spring.datasource.username=root
spring.datasource.password=root
//注意参数参数 rewriteBatchedStatements的配置
spring.datasource.url=jdbc:mysql:///db?serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true

//实现层  
@Service
public class UserService extends ServiceImpl 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 users) {
    //虽然是一条条插入，但是只用了一个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("一条条插入 SQL 耗费时间 {}", (endTime - startTime));
    }
}