查询逻辑修改

src/main/resources/mapper/course/CourseDetailsDao.xml

@@ -61,5 +61,18 @@
             from course_details
         where course_id = #{courseId}
     </select>
+    <select id="countByCourseId" resultType="com.sqx.modules.course.entity.CourseDetails">
+        SELECT
+            course_id as courseId,
+            COUNT(*) AS courseDetailsCount
+        FROM
+            course_details
+            where course_details_id in
+            <foreach collection="detailIdList" item="ids" open="(" separator="," close=")">
+                #{ids}
+            </foreach>
+        GROUP BY
+            course_id
+    </select>
 
 </mapper>