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;@Mapperpublic interface OrderInfoDao extends BaseMapper<OrderInfo> { @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<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 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 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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