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<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());
}

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