dating/src/main/resources/com/bao/dating/mapper/PostMapper.xml

<?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.bao.dating.mapper.PostMapper">

    <!--动态添加-->
    <insert id="insert" useGeneratedKeys="true" keyProperty="postId">
        INSERT INTO post
        (user_id, content,
        <if test="mediaOssKeys != null and mediaOssKeys != ''">
            media_oss_keys,
        </if>
        tags,
        <if test="location != null and location != ''">
            location,
        </if>
        is_public, like_count, favorite_count, created_at, updated_at)
        VALUES
        (#{userId}, #{content},
        <if test="mediaOssKeys != null and mediaOssKeys != ''">
         #{mediaOssKeys, typeHandler=com.bao.dating.handler.ListToVarcharTypeHandler},
        </if>
         #{tags, typeHandler=com.bao.dating.handler.ListToVarcharTypeHandler},
        <if test="location != null and location != ''">
         #{location},
        </if>
         #{isPublic}, 0, 0, #{createdAt}, #{updatedAt})
    </insert>

    <!--修改动态状态-->
    <update id="updatePublicById">
        UPDATE post
        <set>
            is_public = 3,
            updated_at = NOW()
        </set>
        WHERE post_id IN
        <foreach item="postId" index="index" collection="postIds" separator="," open="(" close=")">
            #{postId}
        </foreach>
        AND user_id = #{userId}
    </update>
    
    <!--删除收藏记录-->
    <delete id="deletePostFavoriteByPostId">
        DELETE FROM post_favorite WHERE post_id = #{postId}
    </delete>
    <!--删除点赞记录-->
    <delete id="deletePostLikeByPostId">
        DELETE FROM post_like WHERE post_id = #{postId}
    </delete>
    <!--动态评论删除-->
    <delete id="deleteCommentsByPostId">
        DELETE FROM comments WHERE post_id = #{postId}
    </delete>

    <!--动态查询-->
    <resultMap id="PostResultMap" type="com.bao.dating.pojo.entity.Post">
        <id property="postId" column="post_id"/>
        <result property="userId" column="user_id"/>
        <result property="content" column="content"/>
        <result property="mediaOssKeys" column="media_oss_keys" typeHandler="com.bao.dating.handler.ListToVarcharTypeHandler"/>
        <result property="tags" column="tags" typeHandler="com.bao.dating.handler.ListToVarcharTypeHandler"/>
        <result property="location" column="location"/>
        <result property="isPublic" column="is_public"/>
        <result property="likeCount" column="like_count"/>
        <result property="favoriteCount" column="favorite_count"/>
        <result property="createdAt" column="created_at"/>
        <result property="updatedAt" column="updated_at"/>
    </resultMap>
    <select id="selectById" resultMap="PostResultMap">
        SELECT 
          post_id,
          user_id,
          content,
          media_oss_keys,
          tags,
          location,
          is_public,
          like_count,
          favorite_count,
          created_at,
          updated_at
        FROM post WHERE post_id = #{postId}
    </select>

    <!--动态更新-->
    <update id="updateById">
        UPDATE post
        <set>
            <if test="content != null and content != '' ">
                content = #{content},
            </if>
            <if test="tags != null and tags != '' ">
                tags = #{tags, typeHandler=com.bao.dating.handler.ListToVarcharTypeHandler},
            </if>
            <if test="mediaOssKeys != null">
                media_oss_keys =
                #{mediaOssKeys, typeHandler=com.bao.dating.handler.ListToVarcharTypeHandler},
            </if>
            is_public = #{isPublic},
            updated_at = #{updatedAt}
        </set>
        WHERE post_id = #{postId}
    </update>

    <!--增加点赞数量-->
    <update id="increaseLikeCount">
        update dating.post set like_count = like_count + 1 where post.post_id = #{postId}
    </update>

    <!--减少点赞数量-->
    <update id="decreaseLikeCount">
        update dating.post set like_count= like_count - 1 where post.post_id = #{postId}
    </update>
    <!--增加收藏数量-->
    <update id="increaseFavoriteCount">
        update post set favorite_count = favorite_count + 1 where post_id = #{post_id}
    </update>
    <!--减少收藏数量-->
    <update id="decreaseFavoriteCount">
        update post set favorite_count = favorite_count - 1 where post_id = #{post_id}
    </update>

    <!--查询点赞当前数量-->
    <select id="selectLikeCount" resultType="java.lang.Integer">
        select dating.post.like_count from dating.post where post.post_id = #{postId}
    </select>
    <!--查询当前动态的用户id-->
    <select id="selectUserIdByPostId" resultType="java.lang.Long">
        SELECT user_id FROM post WHERE post_id = #{post_id}
    </select>
    <!--查询当前收藏数量-->
    <select id="selectFavoriteCount" resultType="java.lang.Integer">
        select dating.post.favorite_count from dating.post where post.post_id = #{postId}
    </select>
    <select id="getUsernameByUserId" resultType="map">
        SELECT u.user_name, u.user_id, p.media_oss_keys
        FROM post p 
        LEFT JOIN user u ON p.user_id = u.user_id 
        WHERE p.post_id = #{postId}
    </select>

</mapper>