用户收藏sql优化，接口增加缓存

src/main/java/com/sqx/modules/course/service/impl/CourseCollectServiceImpl.java

@@ -14,6 +14,8 @@ import com.sqx.modules.course.entity.CourseDetails;
 import com.sqx.modules.course.service.CourseCollectService;
 import com.sqx.modules.course.service.CourseDetailsService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cache.annotation.CacheEvict;
+import org.springframework.cache.annotation.CachePut;
 import org.springframework.stereotype.Service;
 
 import java.text.SimpleDateFormat;
@@ -32,6 +34,7 @@ public class CourseCollectServiceImpl extends ServiceImpl<CourseCollectDao, Cour
     private ReentrantReadWriteLock reentrantReadWriteLock=new ReentrantReadWriteLock(true);
 
     @Override
+    @CacheEvict(value = "app:courseCollect", key = "#courseCollect.userId")
     public Result insertCourseCollect(CourseCollect courseCollect) {
         reentrantReadWriteLock.writeLock().lock();
         try {
@@ -95,6 +98,7 @@ public class CourseCollectServiceImpl extends ServiceImpl<CourseCollectDao, Cour
     }
 
     @Override
+    @CachePut(value = "app:courseCollect", key = "#userId")
     public Result selectByUserId(Integer page, Integer limit, Long userId,Integer classify) {
         Page<Course> pages=new Page<>(page,limit);
         IPage<Course> courseIPage = baseMapper.selectCourseByCollect(pages, userId,classify);

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

@@ -10,44 +10,23 @@
         c.*,
         d.course_details_name AS courseDetailsName,
         d.course_details_id AS courseDetailsId,
-        cd.course_details_count AS courseDetailsCount
+        COUNT(d.course_details_id) AS courseDetailsCount
         FROM
         course_collect u
-        LEFT JOIN course c ON u.course_id = c.course_id
+        LEFT JOIN
-        LEFT JOIN (
+        course c ON u.course_id = c.course_id
-        SELECT
+        LEFT JOIN
-        cc.course_id,
+        course_details d ON u.course_details_id = d.course_details_id
-        cc.user_id,
+        LEFT JOIN
-        d.course_details_name,
+        course_collect cc ON u.course_id = cc.course_id AND cc.user_id = #{userId} AND cc.classify = 3
-        d.course_details_id
-        FROM
-        course_collect cc
-        LEFT JOIN course_details d ON cc.course_details_id = d.course_details_id
-        WHERE
-        cc.classify = 3
-        AND cc.user_id = #{userId}
-        ORDER BY
-        cc.update_time DESC
-        ) AS d ON u.course_id = d.course_id
-        LEFT JOIN (
-        SELECT
-        d.course_id,
-        COUNT(*) AS course_details_count
-        FROM
-        course_details d
-        GROUP BY
-        d.course_id
-        ) AS cd ON c.course_id = cd.course_id
         WHERE
         u.user_id = #{userId}
-        AND c.course_id IS NOT NULL
         AND u.classify = #{classify}
+        AND c.course_id IS NOT NULL
         GROUP BY
-        u.course_id
+        u.course_id, c.course_id, d.course_details_name, d.course_details_id
         ORDER BY
-        produceEndTime DESC
+        produceEndTime DESC;
-
-
 
         <!--       SELECT
                    MAX( u.update_time ) AS produceEndTime,