java - 使用 getGenerateKeys 获取更新记录主键失败 - MyBatis

Question

我尝试在 MyBatis(v3.5.1) 中使用这种方式获取更新记录主键:

    <update id="updateForFreeSeat"
            parameterType="com.sportswin.soa.room.model.entity.RoomSeat"
            useGeneratedKeys="true"
            keyProperty="id"
            keyColumn="id">
        update r_room_seat
        set status = 1
        where room_play_id = #{roomPlayId,jdbcType=BIGINT}
        limit 1
    </update>

Mapper.java 定义如下:

int updateForFreeSeat(RoomSeat roomSeat);

现在我得到更新记录 id 失败，该 id 是我的主键。这是我的调试输出:

我应该怎么做才能获取更新记录的id？

Answer 1

我是这样实现的:

    <select id="updateForFreeSeat"
            parameterType="com.sportswin.soa.room.model.entity.RoomSeat" resultType="com.sportswin.soa.room.model.entity.RoomSeat">
        set @update_id := 0;
        UPDATE r_room_seat SET status = #{record.status,jdbcType=INTEGER},
        id = (SELECT @update_id := id),
        user_id = #{record.userId,jdbcType=BIGINT},
        robot_flag = #{record.robotFlag,jdbcType=TINYINT}
        WHERE room_play_id = #{record.roomPlayId,jdbcType=BIGINT} and status = 0
        LIMIT 1;
        select <include refid="Base_Column_List" /> from r_room_seat where id = @update_id;
    </select>

这是我的映射器:

RoomSeat updateForFreeSeat(@Param(value = "record")RoomSeat roomSeat);

这个问题给了我启发How to get ID of the last updated row in MySQL?