data,pend & user dao changed

dao/user/user.py

-import psycopg2
+from misc import with_psql
 import bcrypt
 
 
-class UserDao:
-    
-    def __init__(self):
-        pass
-
-    # decorator implementation
-    def with_psql(f):
-        def _with_psql(*args, **kwargs):
-            conn = psycopg2.connect('dbname=gateway')
-            cur = conn.cursor()
-
-            try:
-                res = f(cur, *args, **kwargs)
-            except (Exception, psycopg2.DatabaseError) as error:
-                conn.rollback()
-                res = (False, error)
-            else:
-                conn.commit()
-            finally:
-                cur.close()
-                conn.close()
-    
-            return res
-        return _with_psql
-
-    @staticmethod
-    @with_psql
-    def create(cur, name, password):
+@with_psql
+def create(cur, name, password):
     query = """
     INSERT INTO
         users
@@ -39,9 +13,8 @@ class UserDao:
     cur.execute(query, (name, bcrypt.hashpw(password, bcrypt.gensalt())))
     return (True,)
 
-    @staticmethod
-    @with_psql 
-    def delete(cur, name):
+@with_psql 
+def delete(cur, name):
     query = """
     DELETE FROM
         users
@@ -51,9 +24,8 @@ class UserDao:
     cur.execute(query, (name,))
     return (True,)
 
-    @staticmethod
-    @with_psql
-    def update_name(cur, old_name, new_name):
+@with_psql
+def update_name(cur, old_name, new_name):
     query = """
     UPDATE users SET
         name = %s
@@ -63,9 +35,8 @@ class UserDao:
     cur.execute(query, (new_name,))
     return (True,)
 
-    @staticmethod
-    @with_psql
-    def update_password(cur, name, password):
+@with_psql
+def update_password(cur, name, password):
     query = """
     UPDATE users SET
         password = %s
@@ -75,9 +46,8 @@ class UserDao:
     cur.execute(query, (password, name))
     return (True,)
 
-    @staticmethod
-    @with_psql
-    def get(cur, name, password):
+@with_psql
+def get(cur, name, password):
     query = """
     SELECT * FROM
         users

server.py

 from flask import Flask, render_template, request, redirect, url_for, session, send_from_directory
 import psycopg2
-import bcrypt
-import misc
+
 import dao.user.user as ud
 import dao.application.application as ad
 import dao.device.device as dd
 import dao.pend.pend as pend
 import dao.data.data as data
-import binascii
+
+import misc
+
 import os
 
 
@@ -44,8 +45,7 @@ def signup():
             feedback = 'Username or password fields cannot be empty'
             return render_template('signup.html', feedback=feedback)
         else:
-            uh = ud.UserDao()
-            res = uh.create(username, password)
+            res = ud.create(username, password)
             if (not res[0]):
                 return render_template('signup.html', feedback=res[1])
             else:
@@ -67,8 +67,7 @@ def login():
             feedback = 'Username or password fields cannot be empty'
             return render_template('login.html', feedback=feedback)
         else:
-            uh = ud.UserDao()
-            res = uh.get(username, password)
+            res = ud.get(username, password)
             if (not res[0]):
                 return render_template('login.html', feedback=msg[1])
             else: