diff --git a/playedu-course/src/main/resources/mapper/CourseMapper.xml b/playedu-course/src/main/resources/mapper/CourseMapper.xml
index ebf4fcc..5cf801e 100644
--- a/playedu-course/src/main/resources/mapper/CourseMapper.xml
+++ b/playedu-course/src/main/resources/mapper/CourseMapper.xml
@@ -96,9 +96,6 @@
                 <when test="sortField == 'created_at'">
                     ORDER BY `courses`.`created_at` ASC
                 </when>
-                <when test="sortField == 'sort_at'">
-                    ORDER BY `courses`.`sort_at` ASC
-                </when>
                 <otherwise>
                     ORDER BY `courses`.`id` ASC
                 </otherwise>
@@ -115,9 +112,6 @@
                 <when test="sortField == 'created_at'">
                     ORDER BY `courses`.`created_at` DESC
                 </when>
-                <when test="sortField == 'sort_at'">
-                    ORDER BY `courses`.`sort_at` DESC
-                </when>
                 <otherwise>
                     ORDER BY `courses`.`id` DESC
                 </otherwise>
diff --git a/playedu-resource/src/main/resources/mapper/ResourceMapper.xml b/playedu-resource/src/main/resources/mapper/ResourceMapper.xml
index bb3e4b2..6228dc7 100644
--- a/playedu-resource/src/main/resources/mapper/ResourceMapper.xml
+++ b/playedu-resource/src/main/resources/mapper/ResourceMapper.xml
@@ -146,9 +146,9 @@
         SELECT DISTINCT ( `resources`.`type` )
         FROM `resources`
         <choose>
-            <when test="categoryIds != null and categoryIds != ''">
+            <when test="categoryIds != null and !categoryIds.isEmpty()">
                 <choose>
-                    <when test="categoryIds.indexOf('0') == 0">
+                    <when test="categoryIds.get(0) == 0">
                         LEFT JOIN `resource_category` ON `resource_category`.`rid` = `resources`.`id`
                         WHERE `resources`.`is_hidden` = 0
                         AND `resource_category`.`cid` IS NULL
@@ -156,7 +156,8 @@
                     <otherwise>
                         INNER JOIN `resource_category` ON `resource_category`.`rid` = `resources`.`id`
                         WHERE `resources`.`is_hidden` = 0
-                        AND `resource_category`.`cid` IN (#{categoryIds})
+                        AND `resource_category`.`cid` IN (<foreach collection="categoryIds" item="tmpId" separator=",">
+                        #{tmpId}</foreach>)
                     </otherwise>
                 </choose>
             </when>