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;@Mapperpublic interface OrderInfoDao extends BaseMapper<OrderInfo> { @Select("select * from order_info ${ew.customSqlSegment}") List<OrderVO> findByCondition(@Param(Constants.WRAPPER)Wrapper wrapper); List<OrderVO> selectOrderVOList(@Param(Constants.WRAPPER)Wrapper wrapper);}

Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.mozq.boot.mpsand01.dao.OrderInfoDao"> <resultMap id="BaseResultMapVO" type="com.mozq.boot.mpsand01.vo.OrderVO"> <id column="ORDER_ID" property="orderId" jdbcType="VARCHAR" /> <result column="USER_ID" property="userId" jdbcType="INTEGER" /> <result column="COMPANY_ID" property="companyId" jdbcType="INTEGER" /> <result column="CUSTOMER_ID" property="customerId" jdbcType="INTEGER" /> <result column="CUSTOMER_NAME" property="customerName" jdbcType="VARCHAR" /> <result column="MOBILE_PHONE" property="mobilePhone" jdbcType="VARCHAR" /> <result column="ACCOUNT_ID" property="accountId" jdbcType="VARCHAR" /> <result column="PRODUCT_ID" property="productId" jdbcType="INTEGER" /> <result column="PRODUCT_NAME" property="productName" jdbcType="VARCHAR" /> <result column="ORDER_TYPE" property="orderType" jdbcType="INTEGER" /> <result column="QUANTITY" property="quantity" jdbcType="DECIMAL" /> <result column="LICENSE_PLATE_NUMBER" property="licensePlateNumber" jdbcType="VARCHAR" /> <result column="PRICE" property="price" jdbcType="DECIMAL" /> <result column="TOTAL_MONEY" property="totalMoney" jdbcType="DECIMAL" /> <result column="PAY_QUANTITY" property="payQuantity" jdbcType="DECIMAL" /> <result column="PAY_MONEY" property="payMoney" jdbcType="DECIMAL" /> <result column="THE_WEIGHT" property="theWeight" jdbcType="INTEGER" /> <result column="DELIVERY_ADDRESS" property="deliveryAddress" jdbcType="VARCHAR" /> <result column="RECEIVE_ADDRESS" property="receiveAddress" jdbcType="VARCHAR" /> <result column="ORDER_STATUS" property="orderStatus" jdbcType="INTEGER" /> <result column="REMARK" property="remark" jdbcType="VARCHAR" /> <result column="PICKUP_TIME" property="pickupTime" jdbcType="TIMESTAMP" /> <result column="CREATE_TIME" property="createTime" jdbcType="TIMESTAMP" /> <result column="UPDATE_TIME" property="updateTime" jdbcType="TIMESTAMP" /> </resultMap> <sql id="Base_Column_List"> 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 </sql> <select id="selectOrderVOList" resultMap="BaseResultMapVO"> select <include refid="Base_Column_List"></include> from order_info ${ew.customSqlSegment} </select></mapper>

测试类

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

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