dormitory_manage/src/main/resources/mapper/RoomMapper.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="space.anyi.mapper.RoomMapper">

    <resultMap id="BaseResultMap" type="space.anyi.entity.Room">
        <id property="id" column="id"/>
        <result property="buildingId" column="building_id"/>
        <result property="roomNumber" column="room_number"/>
        <result property="floor" column="floor"/>
        <result property="capacity" column="capacity"/>
        <result property="gender" column="gender"/>
        <result property="createdAt" column="created_at"/>
        <result property="updatedAt" column="updated_at"/>
        <result property="buildingName" column="building_name"/>
    </resultMap>

    <sql id="BaseColumns">
        r.id, r.building_id, r.room_number, r.floor, r.capacity,
        r.gender, r.created_at, r.updated_at
    </sql>

    <select id="selectAll" resultMap="BaseResultMap">
        SELECT <include refid="BaseColumns"/>, b.name AS building_name
        FROM room r LEFT JOIN dormitory_building b ON r.building_id = b.id
        ORDER BY r.id
    </select>

    <select id="selectByCondition" resultMap="BaseResultMap">
        SELECT <include refid="BaseColumns"/>, b.name AS building_name
        FROM room r LEFT JOIN dormitory_building b ON r.building_id = b.id
        <where>
            <if test="buildingId != null">
                AND r.building_id = #{buildingId}
            </if>
            <if test="floor != null">
                AND r.floor = #{floor}
            </if>
        </where>
        ORDER BY r.id
    </select>

    <select id="selectByBuildingId" resultMap="BaseResultMap">
        SELECT <include refid="BaseColumns"/>, b.name AS building_name
        FROM room r LEFT JOIN dormitory_building b ON r.building_id = b.id
        WHERE r.building_id = #{buildingId} ORDER BY r.room_number
    </select>

    <select id="selectAvailableByBuildingId" resultMap="BaseResultMap">
        SELECT <include refid="BaseColumns"/>, b.name AS building_name,
            (SELECT COUNT(*) FROM bed WHERE room_id = r.id AND status = 0) AS available_beds
        FROM room r LEFT JOIN dormitory_building b ON r.building_id = b.id
        WHERE r.building_id = #{buildingId}
          AND (SELECT COUNT(*) FROM bed WHERE room_id = r.id AND status = 0) > 0
        ORDER BY r.room_number
    </select>

    <select id="selectById" resultMap="BaseResultMap">
        SELECT <include refid="BaseColumns"/>, b.name AS building_name
        FROM room r LEFT JOIN dormitory_building b ON r.building_id = b.id
        WHERE r.id = #{id}
    </select>

    <insert id="insert" useGeneratedKeys="true" keyProperty="id">
        INSERT INTO room (building_id, room_number, floor, capacity, gender)
        VALUES (#{buildingId}, #{roomNumber}, #{floor}, #{capacity}, #{gender})
    </insert>

    <update id="update">
        UPDATE room SET building_id = #{buildingId}, room_number = #{roomNumber},
            floor = #{floor}, capacity = #{capacity}, gender = #{gender}
        WHERE id = #{id}
    </update>

    <delete id="deleteById">
        DELETE FROM room WHERE id = #{id}
    </delete>

    <select id="countBedsByRoomId" resultType="int">
        SELECT COUNT(*) FROM bed WHERE room_id = #{roomId}
    </select>

</mapper>