3.3.1 update

distributed-print/install/mysql/upgrade/3.3.1.sql

@@ -1,3 +1,5 @@
+USE teachcloud_db;
+
 -- -------------补考-----------
 update basic_exam t set t.category = 'MAKEUP' where t.category = 'ONLINE';
 update basic_exam t set t.category = 'FORMAL' where t.category = 'OFFLINE';