internship:基于MyBatis-plus的代码编写

 TunnelConfig enterConfig = tunnelConfigService.getByDuanAndDirection(tunnel.getId(), Duan.ENTER.getKey(), Direction.LEFT.getKey());
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TunnelConfig 为实体类 tunnelConfigService接口的对应方法getByDuanAndDirection：

TunnelConfig getByDuanAndDirection(Integer tunnelId , String duan, String direction);
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有了接口就对应的实现类：

@Service
public class TunnelConfigServiceImpl extends ServiceImpl<TunnelConfigMapper, TunnelConfig> implements TunnelConfigService {
	@Resource
	private TunnelMapper tunnelMapper;
	/**
	 * 查询配置信息
	 */
	@Override
	public TunnelConfig getByDuanAndDirection(Integer tunnelId ,String duan, String direction) {
		return baseMapper.selectOne(new QueryWrapper<TunnelConfig>().eq("tunnel_id", tunnelId).eq("duan", duan).eq("direction", direction).last("limit 1"));
	}
	}
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实现和数据库的数据交互