package com.nowcoder.community.dao;
import com.nowcoder.community.entity.Comment;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface CommentMapper {
List<Comment> selectCommentsByEntity(int entityType, int entityId, int offset, int limit);
int selectCountByEntity(int entityType, int entityId);
int insertComment(Comment comment);
}
1.2 Comment-Mapper.xml
java复制代码
<?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="com.nowcoder.community.dao.CommentMapper">
<sql id="selectFields">
id, user_id, entity_type, entity_id, target_id, content, status, create_time
</sql>
<sql id="insertFields">
user_id, entity_type, entity_id, target_id, content, status, create_time
</sql>
<select id="selectCommentsByEntity" resultType="Comment">
select <include refid="selectFields"></include>
from comment
where status = 0
and entity_type = #{entityType}
and entity_id = #{entityId}
order by create_time asc
limit #{offset}, #{limit}
</select>
<select id="selectCountByEntity" resultType="int">
select count(id)
from comment
where status = 0
and entity_type = #{entityType}
and entity_id = #{entityId}
</select>
<insert id="insertComment" parameterType="Comment">
insert into comment (<include refid="insertFields"></include>)
values (#{userId},#{entityType},#{entityId},#{targetId},#{content},#{status},#{createTime})
</insert>
</mapper>
1.3 DiscussPostMapper.java
java复制代码
package com.nowcoder.community.dao;
import com.nowcoder.community.entity.DiscussPost;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.util.List;
@Mapper
public interface DiscussPostMapper {
List<DiscussPost> selectDiscussPosts(int userId, int offset, int limit);
// @Param注解用于给参数取别名,
// 如果只有一个参数,并且在<if>里使用,则必须加别名.
int selectDiscussPostRows(@Param("userId") int userId);
// 增加帖子
int insertDiscussPost(DiscussPost discussPost);
DiscussPost selectDiscussPostById(int id);
int updateCommentCount(int id, int commentCount);
}
1.4 DiscussPostMapper.xml
java复制代码
<?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="com.nowcoder.community.dao.DiscussPostMapper">
<sql id="selectFields">
id, user_id, title, content, type, status, create_time, comment_count, score
</sql>
<sql id="insertFields">
user_id, title, content, type, status, create_time, comment_count, score
</sql>
<select id="selectDiscussPosts" resultType="DiscussPost">
select <include refid="selectFields"></include>
from discuss_post
where status != 2
<if test="userId!=0">
and user_id = #{userId}
</if>
order by type desc, create_time desc
limit #{offset}, #{limit}
</select>
<select id="selectDiscussPostRows" resultType="int">
select count(id)
from discuss_post
where status != 2
<if test="userId!=0">
and user_id = #{userId}
</if>
</select>
<insert id="insertDiscussPost" parameterType="DiscussPost">
insert into discuss_post (<include refid="insertFields"></include>)
values (#{userId},#{title},#{content},#{type},#{status},#{createTime},#{commentCount},#{score})
</insert>
<select id="selectDiscussPostById" resultType="DiscussPost">
select <include refid="selectFields"></include>
from discuss_post
where id = #{id}
</select>
<update id="updateCommentCount">
update discuss_post set comment_count = #{commentCount} where id = #{id}
</update>
</mapper>
二、业务层
2.1 Service
java复制代码
package com.nowcoder.community.service;
import com.nowcoder.community.dao.CommentMapper;
import com.nowcoder.community.dao.DiscussPostMapper;
import com.nowcoder.community.entity.Comment;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.SensitiveFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.util.HtmlUtils;
import java.util.List;
@Service
public class CommentService implements CommunityConstant{
@Autowired
private CommentMapper commentMapper;
@Autowired
private SensitiveFilter sensitiveFilter;
@Autowired
private DiscussPostService discussPostService;
public List<Comment> findCommentsByEntity(int entityType, int entityId, int offset, int limit){
return commentMapper.selectCommentsByEntity(entityType,entityId,offset,limit);
}
public int findCommentCount(int entityType, int entityId){
return commentMapper.selectCountByEntity(entityType,entityId);
}
@Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
public int addComment(Comment comment){
if(comment == null){
throw new IllegalArgumentException("参数不能为空");
}
// 添加评论，过滤敏感词和html标签
comment.setContent(HtmlUtils.htmlEscape(comment.getContent()));
comment.setContent(sensitiveFilter.filter(comment.getContent()));
int rows = commentMapper.insertComment(comment);
// 更新帖子评论数量
if(comment.getEntityType()==ENTITY_TYPE_POST){ // 一级评论
int count = commentMapper.selectCountByEntity(comment.getEntityType(), comment.getEntityId());
discussPostService.updateCommentCount(comment.getTargetId(), count);
}
return rows;
}
}