基于Angularjs+mybatis实现二级评论系统(仿简书)

一直想写个评论系统，看了下多说，网易,简书的评论，想了下自己该实现怎样的评论系统。

评论系统关键是嵌套层数以及数据库表设计。嵌套层数多，表结构复杂，呈现也麻烦，最后决定实现一个二级评论。系统由maven构建，springboot快速搭建spring环境。前台采用angularjs+bootstrap,后台使用springmvc+mybatis,数据库采用MySQL.前台请求后台API操作评论。

目录结构

数据库表设计

##说说表或者文章表
create table saying (
 saying_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
 sayingContent VARCHAR(500) NOT NULL,
 author VARCHAR(50) NOT NULL,
 sayingAvatar VARCHAR(50) NOT NULL,
 likes VARCHAR(500) NOT NULL,
 createTime datetime NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

##一级评论表
create table firstLevelComment (
 flc_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
 sayingId INT NOT NULL,
 commenter VARCHAR(50) NOT NULL,
 commenterAvatar VARCHAR(50) NOT NULL,
 commentContent VARCHAR(500) NOT NULL,
 commentTime datetime NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

##二级评论表
create table secondLevelComment (
 slc_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
 sayingId INT NOT NULL,
 flcId INT NOT NULL,
 replier VARCHAR(50) NOT NULL,
 toCommenter VARCHAR(50) NOT NULL,
 replyContent VARCHAR(50) NOT NULL,
 replyTime datetime NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

获取评论的mapper(关键)

<?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="personal.timeless.cms.mapper.SayingMapper" > 

 <resultMap id="SayingMap" type="saying" >
 <id column="saying_id" property="id" jdbcType="INTEGER" />
 <result column="sayingContent" property="sayingContent" jdbcType="INTEGER" />
 <result column="author" property="author" jdbcType="VARCHAR" />
 <result column="sayingAvatar" property="avatar" jdbcType="VARCHAR" />
 <result column="likes" property="likes" jdbcType="VARCHAR" />
 <result column="createTime" property="createTime" jdbcType="TIMESTAMP" />
 <collection property="flcs" ofType="firstLevelComment" column="sayingId">
 <id column="flc_id" property="id" jdbcType="INTEGER" />
 <result column="sayingId" property="sayingId" jdbcType="INTEGER" />
 <result column="commenter" property="commenter"/>
 <result column="commenterAvatar" property="avatar"/>
 <result column="commentContent" property="commentContent"/>
 <result column="commentTime" property="commentTime" jdbcType="TIMESTAMP" />
 <collection property="slcs" ofType="secondLevelComment" column="flcId">
  <id column="slc_id" property="id" jdbcType="INTEGER" />
  <result column="flcId" property="flcId" jdbcType="INTEGER" />
  <result column="replier" property="replier"/>
  <result column="toCommenter" property="toCommenter"/>
  <result column="replyContent" property="replyContent"/>
  <result column="replyTime" property="replyTime" jdbcType="TIMESTAMP" />
 </collection>
 </collection>
 </resultMap> 

 <select id="selectOneById" resultMap="SayingMap" parameterType="int" >
 select * from
 (select * from saying s left join firstLevelComment fc on s.saying_id=fc.sayingId where s.saying_id=#{id}) tmp left join secondLevelComment sc
 on tmp.flc_id = sc.flcId
 </select> 

 <select id="updateLikesById">
 update saying set likes = #{likes} where saying_id = #{id}
 </select>
 </mapper> 

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