update db

install/mysql/upgrade/update.sql

@@ -18,6 +18,7 @@ CREATE TABLE `t_time_period_exam_room`
 ) COMMENT = '考场开启时段表';
 
 
+update t_student set open_id = null, uid = null;
 drop index IDX_02 on t_student;
 alter table t_student ADD UNIQUE INDEX IDX_02 (`apply_task_id`, `open_id` );