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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<!-- 配置关于用户评论表的 MyBatis映射文件 -->
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<!-- namespace：必须与对应的接口全类名一致 id:必须与对应接口的某个对应的方法名一致 -->
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<mapper namespace="com.dao.TopicDAO">
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<resultMap type="topic" id="topicMap">
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<id property="topicid" column="topicid" />
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<result property="usersid" column="usersid" />
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<result property="articleid" column="articleid" />
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<result property="contents" column="contents" />
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<result property="addtime" column="addtime" />
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<result property="username" column="username" />
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<result property="title" column="title" />
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<!-- 通过外键关联查询 返回封装Users对象 -->
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<association property="users" column="usersid" select="com.dao.UsersDAO.getUsersById" javaType="com.entity.Users" />
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<!-- 通过外键关联查询 返回封装Article对象 -->
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<association property="article" column="articleid" select="com.dao.ArticleDAO.getArticleById" javaType="com.entity.Article" />
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</resultMap>
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<!-- 用户评论表 插入SQL语句 TopicDAO通过ID(insertTopic)调用此配置 -->
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<insert id="insertTopic" parameterType="topic">
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insert into topic(topicid , usersid , articleid , contents , addtime ) values(#{topicid} , #{usersid} , #{articleid} , #{contents} , #{addtime} )
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</insert>
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<!-- 用户评论表 更新SQL语句 TopicDAO通过ID(updateTopic)调用此配置 -->
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<update id="updateTopic" parameterType="topic">
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update topic set usersid=#{usersid} , articleid=#{articleid} , contents=#{contents} , addtime=#{addtime} where topicid=#{topicid}
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</update>
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<!-- 用户评论表 按主键删除SQL语句 TopicDAO通过ID(deleteTopic)调用此配置 -->
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<delete id="deleteTopic" parameterType="String">
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delete from topic where topicid = #{topicid}
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</delete>
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<!-- 用户评论表 查询全部用户评论信息SQL语句 TopicDAO通过ID(getAllTopic)调用此配置 -->
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<select id="getAllTopic" resultMap="topicMap">
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select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid order by topicid desc
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</select>
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<!-- 用户评论表 按主键(topicid)查询SQL语句 TopicDAO通过ID(getTopicById)调用此配置 -->
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<select id="getTopicById" parameterType="String" resultMap="topicMap">
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select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid and topicid=#{topicid} order by topicid desc
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</select>
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<!-- 用户评论表 按条件精确查询SQL语句 TopicDAO通过ID(getTopicByCond)调用此配置 -->
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<select id="getTopicByCond" parameterType="topic" resultMap="topicMap">
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select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid
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<if test="usersid != null and '' != usersid">
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and a.usersid = #{usersid}
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</if>
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<if test="articleid != null and '' != articleid">
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and a.articleid = #{articleid}
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</if>
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<if test="contents != null and '' != contents">
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and a.contents = #{contents}
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</if>
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<if test="addtime != null and '' != addtime">
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and a.addtime = #{addtime}
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</if>
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</select>
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<!-- 用户评论表 按条件模糊查询SQL语句 TopicDAO通过ID(getTopicByLike)调用此配置 -->
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<select id="getTopicByLike" parameterType="topic" resultMap="topicMap">
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select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid
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<if test="usersid != null and '' != usersid">
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and b.username like CONCAT('%', CONCAT(#{usersid}, '%'))
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</if>
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<if test="articleid != null and '' != articleid">
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and c.title like CONCAT('%', CONCAT(#{articleid}, '%'))
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</if>
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<if test="contents != null and '' != contents">
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and a.contents like CONCAT('%', CONCAT(#{contents}, '%'))
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</if>
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<if test="addtime != null and '' != addtime">
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and a.addtime like CONCAT('%', CONCAT(#{addtime}, '%'))
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</if>
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</select>
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</mapper>
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