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src/main/resources/mapper/CategoriesDao.xml

@@ -172,7 +172,7 @@
         select id, `name`, icon,directory_id
         from categories
         <where>
-            is_deleted = 0
+            is_deleted = 0 and parent_id = 0
             <foreach collection="list" separator="," open="and directory_id in(" close=")" index="index" item="d">
                 #{d}
             </foreach>