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src/main/resources/mapper/CourseMapper.xml

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+<?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.corewing.app.mapper.CourseMapper">
+
+    <!-- 结果映射 -->
+    <resultMap id="VOResultMap" type="com.corewing.app.vo.CourseVO">
+        <id column="id" property="id"/>
+        <result column="course_title" property="courseTitle"/>
+        <result column="description" property="description"/>
+        <result column="content" property="content"/>
+        <result column="view_count" property="viewCount"/>
+        <result column="recommend_status" property="recommendStatus"/>
+        <result column="status" property="status"/>
+        <result column="category_title" property="categoryTitle"/>
+        <result column="create_time" property="createTime"/>
+        <result column="update_time" property="updateTime"/>
+    </resultMap>
+
+    <!-- 基础查询SQL片段 -->
+    <sql id="selectVOSql">
+        select c.*, cc.category_title
+            from app_course c
+        left join app_course_category_relation ccr on c.id = ccr.course_id
+        left join app_course_category cc on cc.id = ccr.category_id
+    </sql>
+
+
+
+    <!-- 分页查询 -->
+    <select id="pageList" resultMap="VOResultMap">
+        <include refid="selectVOSql"/>
+        <where>
+            c.status = 1
+            <if test="categoryId != null and categoryId != 0">
+                AND cc.id = #{categoryId}
+            </if>
+            <if test="courseTitle != null and courseTitle != ''">
+                AND c.course_title like CONCAT('%', #{courseTitle}, '%')
+            </if>
+
+        </where>
+        ORDER BY c.recommend_status,c.create_time asc
+    </select>
+
+</mapper>