三级联动?

联动

@Data
public class NationVo {

    //省市区都是id
    private Integer id;
    //省市区名称
    private String name;
    //省对应市 市对应区的集合
    private List<NationVo> list;

}

<resultMap id="mapVo" type="com.wanghao.wanghaopersys.entity.NationVo">
        <id column="id" property="id" ></id>
        <result column="provinceName" property="name" ></result>
        <collection property="list" ofType="com.wanghao.wanghaopersys.entity.NationVo">
            <id column="bid" property="id" ></id>
            <result column="cityName" property="name" ></result>
            <collection property="list" ofType="com.wanghao.wanghaopersys.entity.NationVo">
                <id column="cid" property="id" ></id>
                <result column="districtName" property="name" ></result>
            </collection>
        </collection>
    </resultMap>
    <select id="findAll" resultMap="mapVo">
        SELECT
        a.id    ,a.`province` provinceName,
        b.id bid,b.city cityName,
        c.id cid,c.district districtName
         FROM nation a
        LEFT JOIN nation b ON a.`id`=b.parent
        LEFT JOIN nation c ON b.`id`=c.parent
        WHERE a.parent=1
    </select>

insertModel: {
username: ‘’,
phone: ‘’,
sex: ‘0’,
userface: ‘’,
province: ‘’,
city: ‘’,
district: ‘’
},