Sqlalchemy + pymssql 连接失败

Question

I have freetds.conf with dbserver connection to database server (which I am routinely using for PHP) , the server is on separate server on our own network.

Just to test the connection, I have this small program:

from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker

engine = create_engine(r"mssql+pymssql://{0}:{1}@dbserver/db_database?charset=utf8".format('user','p@ssw0rd'))

def main():
    print("In main")
    connection=engine.connect()
    print("Connected")

if __name__ == "__main__":
    main()

The program prints in main, but never gets to connect. How can I debug this kind of problem and what is causing this?

I have no problems connecting with PHP, so there are no network restrictions and I am running this with Python 3.6.

Answer 1

I found the error after all myself. The problem was that there is an instance on SQL server I am using. Though in freetds.conf there is the instance port mentioned, I also had to add it to the create_engine call.

The working version of create_engine is so:

engine = create_engine(r"mssql+pymssql://{0}:{1}@dbserver:12345/db_database?charset=utf8".format('user','p@ssw0rd'))

where 12345 is the port number the instance is listening to.

I am sorry that missed that one crucial information bit, but then again, if I had realized it, I probably wouldn't have even asked - and then somebody else might later fight with the same problem.

hank

Answer 2

I encounted the same error when connect to sqlserver2008 
used sqlalchemy and pymssql but if i connect to the same sever with pymssql only ,it work fine!

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
import pymssql

# Password connection
engine = create_engine('mssql+pymssql://rsmonitor:xxx#123@172.16.100.209/rsmonitor')

def main():
    print("In main")
    # this fail 
    connection=engine.connect()
    
    # this fine
    #conn = pymssql.connect('172.16.100.209', 'rsmonitor', 'xxx#123', 'rsmonitor')
    print("Connected")

if __name__ == "__main__":
    main()