MyBatis Plus 将查询结果封装到指定实体的方法步骤

思路

自定义方法，使用Wrapper，自定义映射结果集

Mapper接口

package com.mozq.boot.mpsand01.dao;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.toolkit.Constants;
import com.mozq.boot.mpsand01.pojo.OrderInfo;
import com.mozq.boot.mpsand01.vo.OrderVO;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface OrderInfoDao extends BaseMapper {
  @Select("select * from order_info ${ew.customSqlSegment}")
  /* 只指定2个，其他列能自动匹配的，也会被映射。
  @Results({
      @Result(id = true, column = "ORDER_ID", property = "orderId", jdbcType = JdbcType.VARCHAR),
      @Result(column = "USER_ID", property = "userId", jdbcType = JdbcType.INTEGER)
  })
  */
  List findByCondition(@Param(Constants.WRAPPER)Wrapper wrapper);

  List selectOrderVOList(@Param(Constants.WRAPPER)Wrapper wrapper);
}

Mapper.xml

  
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
  

  
    ORDER_ID,
    USER_ID,
    COMPANY_ID,
    CUSTOMER_ID,
    CUSTOMER_NAME,
    MOBILE_PHONE,
    ACCOUNT_ID,
    PRODUCT_ID,
    PRODUCT_NAME,
    ORDER_TYPE,
    QUANTITY,
    LICENSE_PLATE_NUMBER,
    PRICE,
    TOTAL_MONEY,
    PAY_QUANTITY,
    PAY_MONEY,
    THE_WEIGHT,
    DELIVERY_ADDRESS,
    RECEIVE_ADDRESS,
    ORDER_STATUS,
    REMARK,
    PICKUP_TIME,
    CREATE_TIME,
    UPDATE_TIME
  

  
    select 
    from order_info
    ${ew.customSqlSegment}
  

测试类

@Test
public void selectOrderVOList(){
  List orderVOList = orderInfoDao.selectOrderVOList(
    Wrappers.lambdaQuery()
    .eq(OrderInfo::getUserId, 123456)
    .eq(OrderInfo::getCompanyId, 1)
  );
  System.out.println(orderVOList.size());
  List byCondition = orderInfoDao.findByCondition(
    Wrappers.lambdaQuery()
    .eq(OrderInfo::getUserId, 123456)
    .eq(OrderInfo::getCompanyId, 1)
  );
  System.out.println(byCondition.size());
  List orderInfoList = orderInfoDao.selectList(
    Wrappers.lambdaQuery()
    .eq(OrderInfo::getUserId, 123456)
    .eq(OrderInfo::getCompanyId, 1)
  );
  System.out.println(orderInfoList.size());
}

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