1、创建评论表及表关联

创建动态评论表：t_dynamic_reply

动态评论表和动态表及用户表外键关联

2、xml处理逻辑以及相关文件

编写DynamicReplyMapper.xml文件　

<?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.zhuoying.yingyongji.dao.DynamicReplyDao">

    <resultMap id="baseResultMap" type="com.zhuoying.yingyongji.model.DynamicReply">
        <id property="id" column="id" />
        <result property="userId" column="user_id" />
        <result property="replyDynamicId" column="reply_dynamic_id" />
        <result property="replyReplyId" column="reply_reply_id" />
        <result property="replyUserId" column="reply_user_id" />
        <result property="content" column="content" />
        <result property="createTime" column="create_time" />
        <result property="floorNum" column="floor_num" />
        <association property="user" column="user_id" select="com.zhuoying.yingyongji.dao.UserDao.findByIdSimple" />
        <association property="replyUser" column="reply_user_id" select="com.zhuoying.yingyongji.dao.UserDao.findByIdSimple" />
    </resultMap>

    <resultMap id="detailResultMap" extends="baseResultMap" type="com.zhuoying.yingyongji.model.DynamicReply">
    </resultMap>

    <sql id="baseTable">t_dynamic_reply</sql>


    <insert id="insert" useGeneratedKeys="true" keyProperty="id">
        INSERT INTO <include refid="baseTable" />(user_id,reply_dynamic_id,reply_reply_id,reply_user_id,content,create_time,floor_num)
        VALUES
        <foreach collection="array" item="item" separator=",">
            (#{item.userId},#{item.replyDynamicId},#{item.replyReplyId},#{item.replyUserId},#{item.content},#{item.createTime},#{item.floorNum})
        </foreach>
    </insert>

    <select id="list" resultMap="baseResultMap">
        SELECT *  FROM <include refid="baseTable" />
        <if test="param != null">
            <where>
                <if test="param.userId != null">AND user_id=#{param.userId}</if>
                <if test="param.replyDynamicId != null">AND reply_dynamic_id=#{param.replyDynamicId}</if>
                <if test="param.replyReplyId != null">AND reply_reply_id=#{param.replyReplyId}</if>
                <if test="param.replyUserId != null">AND reply_user_id=#{param.replyUserId}</if>
                <if test="param.content != null">AND content=#{param.content}</if>
                <if test="param.createTime != null">AND create_time=#{param.createTime}</if>
                <if test="param.floorNum != null">AND floor_num=#{param.floorNum}</if>
            </where>
        </if>
    </select>

    <select id="findMaxFloorNum" resultType="java.lang.Integer">
        SELECT IFNULL(MAX(floor_num),0) FROM <include refid="baseTable" /> WHERE reply_dynamic_id=#{dynamicId}
    </select>

    <select id="findById" resultMap="detailResultMap">
        SELECT * FROM <include refid="baseTable" /> WHERE id=#{id}
    </select>

    <select id="findByIdSimple" resultMap="baseResultMap">
        SELECT id FROM <include refid="baseTable" /> WHERE id=#{id}
    </select>

    <update id="updateByIds">
        UPDATE <include refid="baseTable" />
        <set>
            <if test="param.userId != null">user_id=#{param.userId},</if>
            <if test="param.replyDynamicId != null">reply_dynamic_id=#{param.replyDynamicId},</if>
            <if test="param.replyReplyId != null">reply_reply_id=#{param.replyReplyId},</if>
            <if test="param.replyUserId != null">reply_user_id=#{param.replyUserId},</if>
            <if test="param.content != null">content=#{param.content},</if>
            <if test="param.createTime != null">create_time=#{param.createTime},</if>
            <if test="param.floorNum != null">floor_num=#{param.floorNum},</if>
        </set>
        WHERE id IN
        <foreach collection="ids" item="item" open="(" separator="," close=")">
            #{item}
        </foreach>
    </update>

    <delete id="deleteByIds">
        DELETE FROM <include refid="baseTable" /> WHERE id IN
        <foreach collection="array" item="item" open="(" separator="," close=")">
            #{item}
        </foreach>
    </delete>
</mapper>

model层的 DynamicReply 类

@Data
@Accessors(chain = true)
public class DynamicReply {

    private Long id;
    private Long userId;
    private Long replyDynamicId;
    private Long replyReplyId;
    private Long replyUserId;
    private String content;
    private Date createTime;
    private Integer floorNum;
    private User user;
    private User replyUser;
    private String createTimeDesc;



}

Dao层 DynamicReplyDao 类

@Repository
public interface DynamicReplyDao extends BaseDao<DynamicReply, Long> {

    Integer findMaxFloorNum(Long dynamicId);

}

由于BaseDao接口已经封装好xml使用的方法，所以直接继承

public interface BaseDao<T, ID> {

    int insert(T... beans);

    List<T> list(@Param("param") T beans);

    List<T> listDetail(@Param("param") T param);

    int count(@Param("param") T param);

    T findById(ID id);

    T findByIdSimple(ID id);

    int updateByIds(@Param("param") T param, @Param("ids") ID... ids);

    int deleteByIds(ID... ids);
}

3、Controller层编写

@Api(tags = DynamicController.TAG_DESC + "接口")
@RestController
@RequestMapping("/api/dynamic/reply")
public class DynamicReplyController {

    public static final String TAG_DESC = "动态评论";


    @Autowired
    private DynamicService dynamicService;

    @Autowired
    private DynamicReplyService dynamicReplyService;

    @Transactional
    @ApiOperation("新增" + TAG_DESC)
    @PostMapping("/add")
    public JsonResult add(@ValidRequestParam(desc = "用户Id") Long user_id,
                          @ValidRequestParam(desc = "回复动态Id") Long reply_dynamic_id,
                          @ValidParam(desc = "回复评论id") Long reply_reply_id,
                          @ValidParam(desc = "回复用户id") Long reply_user_id,
                          @ValidRequestParam(desc = "内容") String content,
                          @ValidRequestParam(desc = "创建时间", defaultValue = ValidDateType.CURRENT_TIME) Date create_time)
    {
        dynamicService.updateByIds(new Dynamic().setUpdateTime(new Date()), reply_dynamic_id);

        DynamicReply dynamicReply = new DynamicReply()
                .setUserId(user_id)
                .setReplyDynamicId(reply_dynamic_id)
                .setReplyReplyId(reply_reply_id)
                .setReplyUserId(reply_user_id)
                .setContent(content)
                .setCreateTime(create_time)
                .setFloorNum(dynamicReplyService.findMaxFloorNum(reply_dynamic_id) + 1);
        dynamicReplyService.insert(dynamicReply);
        return JsonResult.okAndReturnId(dynamicReply.getId());
    }

    @ApiOperation("查询动态评论列表")
    @GetMapping("/list")
    public JsonResult list(@ApiParam("用户id") Long user_id,
                           @ApiParam("回复动态id") Long reply_dynamic_id,
                           @ApiParam("回复评论id") Long reply_reply_id,
                           @ApiParam("回复用户id") Long reply_user_id,
                           @ApiParam("内容") String content,
                           @ApiParam("创建时间") Date create_time,
                           @ValidModel PageParam pageParam,
                           @RequestParam(defaultValue = "id desc") @ApiParam("排序") String sort)
    {
        DynamicReply dynamicReply = new DynamicReply()
                .setUserId(user_id)
                .setReplyDynamicId(reply_dynamic_id)
                .setReplyReplyId(reply_reply_id)
                .setReplyUserId(reply_user_id)
                .setContent(content)
                .setCreateTime(create_time);
        PageHelper.startPage(pageParam.getPage_num(), pageParam.getPage_size(), sort);
        return JsonResult.data(new MyPageInfo<>(dynamicReplyService.list(dynamicReply)));
    }

    @ApiOperation("根据id查询动态评论")
    @GetMapping("/get")
    public JsonResult select(@RequestParam Long id) {
        return  JsonResult.data(dynamicReplyService.findById(id));
    }

    @ApiOperation("根据id查询动态(基础)")
    @GetMapping("/get/simple")
    public JsonResult selectSimple(@RequestParam Long id) {
        return  JsonResult.data(dynamicReplyService.findByIdSimple(id));
    }

    @ApiOperation("修改动态评论")
    @PostMapping("/update")
    public JsonResult update(@RequestParam Long[] id,
                             @ValidParam(desc = "用户id") Long user_id,
                             @ValidParam(desc = "回复动态id") Long reply_dynamic_id,
                             @ValidParam(desc = "回复评论id") Long reply_reply_id,
                             @ValidParam(desc = "回复用户id") Long reply_user_id,
                             @ValidParam(desc = "内容") String content,
                             @ValidParam(desc = "创建时间") Date create_time)
    {
        DynamicReply dynamicReply = new DynamicReply()
                .setUserId(user_id)
                .setReplyDynamicId(reply_dynamic_id)
                .setReplyReplyId(reply_reply_id)
                .setReplyUserId(reply_user_id)
                .setContent(content)
                .setCreateTime(create_time);
        dynamicReplyService.updateByIds(dynamicReply, id);
        return JsonResult.ok();
    }

    @ApiOperation("删除动态评论")
    @PostMapping("/delete")
    public JsonResult delete(@RequestParam Long[] id) {
        dynamicReplyService.deleteByIds(id);
        return JsonResult.ok();
    }
}

4、Api文档

用于记录本人的开发经历

新手小白，请多体谅、指教