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這篇文章將為大家詳細講解有關Angularjs+mybatis如何實現二級評論系統,小編覺得挺實用的,因此分享給大家做個參考,希望大家閱讀完這篇文章后可以有所收獲。
評論系統關鍵是嵌套層數以及數據庫表設計。嵌套層數多,表結構復雜,呈現也麻煩,最后決定實現一個二級評論。系統由maven構建,springboot快速搭建spring環境。前臺采用angularjs+bootstrap,后臺使用springmvc+mybatis,數據庫采用MySQL.前臺請求后臺API操作評論。
目錄結構
數據庫表設計
##說說表或者文章表 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; ##一級評論表 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; ##二級評論表 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;
獲取評論的mapper(關鍵)
<?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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