sb-backend/src/main/resources/mapper/PostMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.sb.web.board.mapper.PostMapper">

    <sql id="filter">
        <if test="tag != null and tag != ''">
            JOIN post_tag pt ON pt.post_id = p.id
            JOIN tag t ON t.id = pt.tag_id
        </if>
        <where>
            <if test="category != null and category != ''">
                AND p.category = #{category}
            </if>
            <if test="tag != null and tag != ''">
                AND t.name = #{tag}
            </if>
            <if test="keyword != null and keyword != ''">
                <choose>
                    <when test="searchType == 'content'">
                        AND p.content LIKE CONCAT('%', #{keyword}, '%')
                    </when>
                    <when test="searchType == 'comment'">
                        AND EXISTS (SELECT 1 FROM comment c
                                    WHERE c.post_id = p.id
                                      AND c.content LIKE CONCAT('%', #{keyword}, '%'))
                    </when>
                    <otherwise>
                        AND p.title LIKE CONCAT('%', #{keyword}, '%')
                    </otherwise>
                </choose>
            </if>
        </where>
    </sql>

    <select id="findPage" resultType="com.sb.web.board.dto.PostSummary">
        SELECT
            p.id, p.title, p.author_name, p.view_count, p.blocked, p.created_at,
            (SELECT COUNT(*) FROM comment c WHERE c.post_id = p.id) AS comment_count
        FROM post p
        <include refid="filter"/>
        ORDER BY p.id DESC
        LIMIT #{size} OFFSET #{offset}
    </select>

    <select id="countPage" resultType="long">
        SELECT COUNT(*)
        FROM post p
        <include refid="filter"/>
    </select>

    <select id="findById" parameterType="long" resultType="com.sb.web.board.domain.Post">
        SELECT id, title, content, author_id, author_name, view_count,
               blocked, block_reason, category, created_at, updated_at
        FROM post
        WHERE id = #{id}
    </select>

    <insert id="insert" parameterType="com.sb.web.board.domain.Post"
            useGeneratedKeys="true" keyProperty="id">
        INSERT INTO post (title, content, author_id, author_name, view_count, category, created_at, updated_at)
        VALUES (#{title}, #{content}, #{authorId}, #{authorName}, 0, #{category}, NOW(), NOW())
    </insert>

    <update id="update" parameterType="com.sb.web.board.domain.Post">
        UPDATE post
        SET title = #{title}, content = #{content}
        WHERE id = #{id}
    </update>

    <delete id="delete" parameterType="long">
        DELETE FROM post WHERE id = #{id}
    </delete>

    <update id="increaseViewCount" parameterType="long">
        UPDATE post SET view_count = view_count + 1 WHERE id = #{id}
    </update>

    <update id="updateBlocked">
        UPDATE post SET blocked = #{blocked}, block_reason = #{blockReason} WHERE id = #{id}
    </update>

</mapper>