用Angularjs+mybatis做出评论系统

这次给大家带来用Angularjs+mybatis做出评论系统，用Angularjs+mybatis做评论系统的注意事项有哪些？下面就是实战案例，一起来看一下。

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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