AttributeError: 'NoneType' object has no attribute 'GetDataStore'
-
20-09-2019 - |
Question
I guys, I developing a utility in python and i have 2 object the main class and an database helper for get sqlserver data.
database.py
import _mssql
class sqlserver(object):
global _host, _userid, _pwd, _db
def __new__ (self, host, userid, pwd, database):
_host = host
_userid = userid
_pwd = pwd
_db = database
def GetDataStore(self, sql):
conn = _mssql.connect(server='(local)\\sqlexpress', user='sa', password='xxx', database='Framework.Data2')
conn.execute_non_query('CREATE TABLE persons(id INT, name VARCHAR(100))')
conn.execute_non_query("INSERT INTO persons VALUES(1, 'John Doe')")
conn.execute_non_query("INSERT INTO persons VALUES(2, 'Jane Doe')")
gaemodel.py
import os
import sys
from fwk import system, types, databases
class helper(object):
pass
def usage(app_name):
return "Usage: %s <project name>" % (app_name)
def main(argv):
_io = system.io()
project_name = argv[1]
project_home = os.path.join(_io.CurrentDir(), project_name)
_db = databases.sqlserver('(local)\sqlexpress', 'sa', 'P1lim07181702', 'Framework.Data2')
_db.GetDataStore("select name from sysobjects where xtype = 'U' and name not like 'Meta%'")
str = "from google.appengine.ext import db"
#for row in cur:
# str += "class %s" % row["name"]
print cur
if __name__ == "__main__":
if len(sys.argv) > 1:
main(sys.argv[1:])
else:
print usage(sys.argv[0]);
My problem is when i try run code return me this error
Traceback (most recent call last):
File "C:\Projectos\FrameworkGAE\src\gaemodel.py", line 28, in <module>
main(sys.argv[1:])
File "C:\Projectos\FrameworkGAE\src\gaemodel.py", line 18, in main
_ db. GetDataStore("select name from sysobjects where xtype = 'U' and name not like 'Meta%'")
AttributeError: 'NoneType' object has no attribute 'GetDataStore'
What is wrong ??
Solution
First of all:
- The
__new__
method should be named__init__
. - Remove the global _host etc. line
Then change the __init__
method:
self.host = host
self.userid = userid
etc.
And change GetDataStore
:
conn = _mssql.connect(server=self.host, user=self.userid, etc.)
That should do the trick.
I suggest you read a bit on object-oriented Python.
OTHER TIPS
Have a look at what __new__
is supposed to be doing and what arguments it's supposed to have. I think you wanted to use __init__
and not __new__
. The reason for your particular error is that _db
is None
.
I think you want to change databases.py like this:
import _mssql
class sqlserver(object):
def __init__ (self, host, userid, pwd, database):
self.host = host
self.userid = userid
self.pwd = pwd
self.db = database
def GetDataStore(self, sql):
conn = _mssql.connect(server=self.host, user=self.userid, password=self.pwd, database=self.db)
conn.execute_non_query('CREATE TABLE persons(id INT, name VARCHAR(100))')
conn.execute_non_query("INSERT INTO persons VALUES(1, 'John Doe')")
conn.execute_non_query("INSERT INTO persons VALUES(2, 'Jane Doe')")
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