deliver/src/main/resources/mapper/category/CategoryMapper.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.nosum.deliver.category.dao.CategoryDao">

    <!-- 通用查询映射结果 -->
    <resultMap id="BaseResultMap" type="com.nosum.deliver.category.domain.po.Category">
        <id column="id" property="id"/>
        <result column="name" property="name"/>
        <result column="sort" property="sort"/>
        <result column="create_time" property="createTime"/>
        <result column="update_time" property="updateTime"/>
    </resultMap>

    <sql id="BASE_SQL">id,name,sort,create_time, create_by, update_time, update_by</sql>

    <select id="selectCategoryPostsTotal" resultType="com.nosum.deliver.category.domain.vo.CategoryVO">
       SELECT
        categoryTags.category_id id,
        COUNT(*) total
        FROM
        category_tags categoryTags
        LEFT JOIN posts_tags postsTags ON postsTags.tags_id = categoryTags.tags_id
        WHERE
        postsTags.posts_id IS NOT NULL
        GROUP BY categoryTags.category_id
    </select>
    <select id="selectStatistics" resultType="com.nosum.deliver.category.domain.vo.CategoryVO">
        SELECT
           id,(SELECT COUNT( 1 ) FROM posts WHERE category_id = category.id AND status=2) as total, name
        FROM
            category AS category
    </select>
    <select id="selectListPage" resultType="com.nosum.deliver.category.domain.po.Category">
        SELECT <include refid="BASE_SQL"/>
        FROM category
        <where>
            <if test="condition.keywords != null and condition.keywords != ''">
                AND name like #{condition.name}
            </if>
            <if test="condition.name != null and condition.name != ''">
                AND name = #{condition.name}
            </if>
        </where>
        ORDER BY id DESC
    </select>
</mapper>