首页查询优化

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

@@ -39,7 +39,7 @@
         c.dy_show as dyShow,
         c.sort,
         round(10000*rand(),0) as goodNum,
-        d.courseDetailsCount,
+        ifnull(d.courseDetailsCount,0) as courseDetailsCount,
         null AS courseDetailsName,
         null AS courseDetailsId,
         round(10000*rand(),0) as weekGoodNum,
@@ -139,7 +139,7 @@
         c.course_type as courseType,
         c.banner_id as bannerId,
         b.name as bannerName,
-        d.viewCounts,
+        ifnull(d.viewCounts,0) as viewCounts,
         c.dy_img_id as dyImgId,
         c.dy_course_id as dyCourseId,
         c.dy_status as dyStatus,
@@ -170,10 +170,10 @@
         c.`wx_course_status` as wxCourseStatus,
         t.dyUrlStatus,
         o.payMoney,
-        d.goodNum,
-        d.courseDetailsCount,
+        ifnull(d.goodNum,0) as goodNum,
+        ifnull(d.courseDetailsCount) as courseDetailsCount,
         0 as weekGoodNum,
-        tt.isRecommend
+        ifnull(tt.isRecommend,0) as isRecommend
         FROM
         course AS c
         LEFT JOIN course_classification AS cc ON c.classify_id = cc.classification_id