mybatis-plus 实现多条件映射关系查询（范围查询）

根据时间、人均花费、出行天数查询

2. 接收前台传过来的参数

package com.yy.springboot.query;

import lombok.Getter;
import lombok.Setter;

@Setter
@Getter
public class TravelQuery extends  QueryObject{
          
   
    private String orderBy = "1";
    private Integer travelTimeType = -1;
    private Integer consumeType = -1;
    private Integer dayType = -1;
}

3. 设计条件类

package com.yy.springboot.query;

import lombok.Data;

import java.util.HashMap;
import java.util.Map;

@Data
public class TravelCondition {
          
   
    private Integer min;
    private Integer max;
    public static final Map<Integer, TravelCondition> DAY_MAP = new HashMap<>();       // 天数
    public static final Map<Integer, TravelCondition> CONSUME_MAP = new HashMap<>();   // 花费金额
    public static final Map<Integer, TravelCondition> TIME_MAP = new HashMap<>();      // 月份

    static {
          
   
        TIME_MAP.put(1, new TravelCondition(1, 2));
        TIME_MAP.put(2, new TravelCondition(3, 4));
        TIME_MAP.put(3, new TravelCondition(5, 6));
        TIME_MAP.put(4, new TravelCondition(7, 8));
        TIME_MAP.put(5, new TravelCondition(9, 10));
        TIME_MAP.put(6, new TravelCondition(11, 12));

        CONSUME_MAP.put(1, new TravelCondition(0, 999));
        CONSUME_MAP.put(2, new TravelCondition(1000, 6000));
        CONSUME_MAP.put(3, new TravelCondition(6000, 20000));
        CONSUME_MAP.put(4, new TravelCondition(20000, Integer.MAX_VALUE));

        DAY_MAP.put(1, new TravelCondition(0, 3));
        DAY_MAP.put(2, new TravelCondition(4, 7));
        DAY_MAP.put(3, new TravelCondition(8, 14));
        DAY_MAP.put(4, new TravelCondition(15, Integer.MAX_VALUE));
    }

    public TravelCondition(Integer min, Integer max) {
          
   
        this.min = min;
        this.max = max;
    }
}

4. Service 业务层查询方法

@Service
@Transactional
public class TravelServiceImpl extends ServiceImpl<TravelMapper, Travel> implements ITravelService {
          
   
    @Autowired
    private IUserInfoService userInfoService;

    @Override
    public IPage<Travel> queryPage(TravelQuery qo) {
          
   
        IPage<Travel> page = new Page<>(qo.getCurrentPage(), qo.getPageSize());
        QueryWrapper<Travel> wrapper = Wrappers.<Travel>query();
        // 判断排序是否为空
        if (qo.getOrderBy() != null) {
          
   
            wrapper.orderByDesc(qo.getOrderBy().equals("1") ? "create_time" : qo.getOrderBy());
        }

        // 出发时间
        TravelCondition time = TravelCondition.TIME_MAP.get(qo.getTravelTimeType());
        if (time != null) {
          
   
            wrapper.ge("Month(travel_time)", time.getMin())
                    .le("Month(travel_time)", time.getMax());
        }

        // 人均花费
        TravelCondition consume = TravelCondition.CONSUME_MAP.get(qo.getConsumeType());
        if (consume != null) {
          
   
            wrapper.ge("avg_consume", consume.getMin())
                    .le("avg_consume", consume.getMax());
        }

        // 出行天数
        TravelCondition day = TravelCondition.DAY_MAP.get(qo.getDayType());
        if (day != null) {
          
   
            wrapper.ge("day", day.getMin())
                    .le("day", day.getMax());
        }

        IPage<Travel> page1 = super.page(page, wrapper);

        // 把用户设置到游记详情中去
        for (Travel travel : page1.getRecords()) {
          
   
            travel.setAuthor(userInfoService.getById(travel.getAuthorId()));
        }
        return page1;
    }
}