diff --git a/scripts/upgrade/db_update_helper.py b/scripts/upgrade/db_update_helper.py
index d9247bc..45b4b46 100644
--- a/scripts/upgrade/db_update_helper.py
+++ b/scripts/upgrade/db_update_helper.py
@@ -26,8 +26,10 @@ class EnvManager(object):
         self.seafile_dir = os.environ['SEAFILE_CONF_DIR']
         self.central_config_dir = os.environ.get('SEAFILE_CENTRAL_CONF_DIR')
 
+
 env_mgr = EnvManager()
 
+
 class Utils(object):
     @staticmethod
     def highlight(content, is_error=False):
@@ -69,6 +71,8 @@ class MySQLDBInfo(object):
 class DBUpdater(object):
     def __init__(self, version, name):
         self.sql_dir = os.path.join(env_mgr.upgrade_dir, 'sql', version, name)
+        pro_path = os.path.join(env_mgr.install_path, 'pro')
+        self.is_pro = os.path.exists(pro_path)
 
     @staticmethod
     def get_instance(version):
@@ -263,9 +267,6 @@ class SQLiteDBUpdater(DBUpdater):
         self.seahub_db = os.path.join(env_mgr.top_dir, 'seahub.db')
         self.seafevents_db = os.path.join(env_mgr.top_dir, 'seafevents.db')
 
-    def is_pro(self):
-        return os.path.exists(self.seafevents_db)
-
     def update_db(self):
         super(SQLiteDBUpdater, self).update_db()
         for sql_path in glob.glob(os.path.join(self.sql_dir, 'ccnet', '*.sql')):
@@ -294,9 +295,8 @@ class SQLiteDBUpdater(DBUpdater):
         self.apply_sqls(self.seahub_db, sql_path)
 
     def update_seafevents_sql(self, sql_path):
-        if self.is_pro():
-            Utils.info('updating seafevents database...')
-            self.apply_sqls(self.seafevents_db, sql_path)
+        if self.is_pro:
+            Utils.info('seafevents do not support sqlite3 database')
 
 
 class MySQLDBUpdater(DBUpdater):
@@ -316,9 +316,9 @@ class MySQLDBUpdater(DBUpdater):
         self.apply_sqls(self.seahub_db_info, seahub_sql)
 
     def update_seafevents_sql(self, seafevents_sql):
-        if self.is_pro(self.seahub_db_info):
+        if self.is_pro:
             Utils.info('updating seafevents database...')
-            self.apply_sqls(self.seahub_db_info, seahub_sql)
+            self.apply_sqls(self.seahub_db_info, seafevents_sql)
 
     def get_conn(self, info):
         kw = dict(
@@ -368,14 +368,6 @@ class MySQLDBUpdater(DBUpdater):
             else:
                 self.execute_sql(conn, line)
 
-    def is_pro(self, info):
-        conn = self.get_conn(info)
-        cursor = conn.cursor()
-        text = "select count(1) from information_schema.tables where table_schema=%s and table_name=%s"
-        cursor.execute(text, (info.db, 'Event'))
-        res = cursor.fetchone()
-        return res[0] == 1
-
 
 def main():
     skipdb = os.environ.get('SEAFILE_SKIP_DB_UPGRADE', '').lower()