MyBatis Plus 将查询结果封装到指定实体

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<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 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

@Test

public 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());

}