huimv-deqing-huyang/huimv-huyang-admin/target/classes/mapper/BaseBuildingMapper.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.huimv.admin.admin.mapper.BaseBuildingMapper">

    <select id="getCageById" resultType="integer">
   select id from `base_building` where parent_id = #{id}
</select>
</mapper>