diff --git a/vnc_console_connection/db_export.py b/vnc_console_connection/db_export.py
index d283eb4..b7fab12 100755
--- a/vnc_console_connection/db_export.py
+++ b/vnc_console_connection/db_export.py
@@ -1,5 +1,14 @@
 import psycopg2 as pg2
 from config import config
+import logging
+
+logger = logging.getLogger()
+logger.setLevel(logging.INFO)
+formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+file_handler = logging.FileHandler('/var/log/desktop.log')
+file_handler.setFormatter(formatter)
+logger.addHandler(file_handler)
+
 
 db_name = config['db']['db_name']
 db_user = config['db']['db_user']
@@ -10,15 +19,15 @@ db_port = config['db']['db_port']
 def setconn(u_id, vm_num, vm_port,vm_host):
     conn = pg2.connect("host = localhost dbname={} user={} password={} port={}".format(db_name,db_user,db_password,db_port))
     conn.autocommit = True
-    cur = conn.cursor() 
+    cur = conn.cursor()
     cur.execute("SELECT entity_id FROM guacamole_entity WHERE name = '{}'".format(u_id))
     row = cur.fetchone()
     if row == None:
-        cur.execute("INSERT INTO guacamole_entity (name, type) VALUES ('{}','USER')".format(u_id))    
+        cur.execute("INSERT INTO guacamole_entity (name, type) VALUES ('{}','USER')".format(u_id))
         cur.execute("SELECT entity_id FROM guacamole_entity WHERE name = '{}'".format(u_id))
         row = cur.fetchone()
         en_id = row[0]
-        cur.execute("INSERT INTO guacamole_user(entity_id, password_hash, password_date) VALUES ('{}', '\x74657374', now())".format(en_id)) 
+        cur.execute("INSERT INTO guacamole_user(entity_id, password_hash, password_date) VALUES ('{}', '\x74657374', now())".format(en_id))
         print("create user : " , u_id)
     else:
         en_id = row[0]
@@ -43,7 +52,9 @@ def setconn(u_id, vm_num, vm_port,vm_host):
         #clipboard-encoding
         cur.execute("INSERT INTO guacamole_connection_parameter VALUES ('{}','clipboard-encoding','UTF-8')".format(cn_id))
         print("create connection")
-    else:    
+        log = "create connection : " + cn
+        logging.info(log)
+    else:
         cur.execute("SELECT MAX(connection_id) FROM guacamole_connection WHERE connection_name = '{}' AND parent_id IS NULL".format(cn))
         temp_cn_id = cur.fetchone()
         cn_id = temp_cn_id[0]
@@ -52,4 +63,30 @@ def setconn(u_id, vm_num, vm_port,vm_host):
         #cur.execute("UPDATE guacamole_connection_parameter SET parameter_value='UTF-8' where connection_id='{}' and parameter_name='clipboard-encoding'".format(cn_id))
         print("no connection")
     conn.close()
-    return None
\ No newline at end of file
+    return None
+
+
+def delconn(u_id, vm_num):
+    conn2 = pg2.connect("host = localhost dbname={} user={} password={} port={}".format(db_name,db_user,db_password,db_port))
+    conn2.autocommit = True
+    cur2 = conn2.cursor()
+    cur2.execute("SELECT entity_id FROM guacamole_entity WHERE name = '{}'".format(u_id))
+    row2 = cur2.fetchone()
+    if row2 == None:
+        print("no user : " , u_id)
+    else:
+        cn2 = "{}{}".format(u_id,vm_num)
+        cur2.execute("SELECT connection_id FROM guacamole_connection WHERE connection_name = '{}'".format(cn2))
+        row2 = cur2.fetchone()
+        if row2 != None:
+            print("cn_id : ", row2[0])
+            #delete connection
+            cur2.execute("SELECT connection_id from guacamole_connection_permission where connection_id = '{}'".format(row2[0]))
+            row2 = cur2.fetchone()
+            if row2 != None:
+                print("delete connection : ",row2[0])
+                cur2.execute("delete from guacamole_connection_permission where connection_id = '{}'".format(row2[0]))
+                log = "delete connection : " + cn2
+                logging.info(log)
+    conn2.close()
+    
\ No newline at end of file