caimei365-manager-api/src/main/resources/mapper/AddressMapper.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.caimei365.manager.dao.AddressMapper">

    <select id="getAllProvinceList" resultType="com.caimei365.manager.entity.caimei.AddressSelectVo">
        SELECT provinceID AS id, name
        FROM province
        WHERE validFlag = '1'
    </select>

    <select id="getCityListByProvinceId" resultType="com.caimei365.manager.entity.caimei.AddressSelectVo">
        SELECT provinceID AS parentId, cityID AS id, name
        FROM city
        WHERE provinceID = #{provinceId}
          AND validFlag = '1'
    </select>

    <select id="getTownListByCityId" resultType="com.caimei365.manager.entity.caimei.AddressSelectVo">
        SELECT cityID AS parentId, townID AS id, name
        FROM town
        WHERE cityID = #{cityId}
          AND validFlag = '1'
    </select>

    <resultMap id="ProvinceResultMap" type="com.caimei365.manager.entity.caimei.AddressSelectVo">
        <id property="id" column="provinceID"/>
        <result property="name" column="name"/>
        <collection property="children" ofType="com.caimei365.manager.entity.caimei.AddressSelectVo" resultMap="CityResultMap"/>
    </resultMap>

    <resultMap id="CityResultMap" type="com.caimei365.manager.entity.caimei.AddressSelectVo">
        <id property="id" column="cityID"/>
        <result property="name" column="name"/>
        <result property="parentId" column="provinceID"/>
        <collection property="children" ofType="com.caimei365.manager.entity.caimei.AddressSelectVo" resultMap="TownResultMap"/>
    </resultMap>

    <resultMap id="TownResultMap" type="com.caimei365.manager.entity.caimei.AddressSelectVo">
        <id property="id" column="townID"/>
        <result property="parentId" column="cityID"/>
        <result property="name" column="name"/>
    </resultMap>

    <select id="selectAllAddresses" resultMap="ProvinceResultMap">
        SELECT p.provinceId,
               p.name AS provinceName,
               c.cityId,
               c.name AS cityName,
               t.townId,
               t.name AS townName
        FROM province p
        LEFT JOIN city c ON p.provinceId = c.provinceId
        LEFT JOIN town t ON c.cityId = t.cityId
    </select>

    <select id="getAddByTownId" resultType="com.caimei365.manager.entity.caimei.AddressSelectVo">
        SELECT a.name   as "province"
             , b.name   as "city"
             , c.name   as "town"
             , c.townId as "id"
        FROM province a
                 RIGHT JOIN city b ON a.provinceId = b.provinceId
                 RIGHT JOIN town c ON b.cityId = c.cityId
        WHERE c.townId = #{townId}
    </select>
</mapper>