##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; 

<?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>