Connecting to Microsoft SQL server using Python

I am trying to connect to SQL through python to run some queries on some SQL databases on Microsoft SQL server. From my research online and on this forum the most promising library seems to be pyodbc. So I have made the following code

import pyodbc
conn = pyodbc.connect(init_string="driver={SQLOLEDB}; server=+ServerName+; 
database=+MSQLDatabase+; trusted_connection=true")
cursor = conn.cursor()

and get the following error

Traceback (most recent call last):
  File "C:\Users...\scrap.py", line 3, in <module>
    conn = pyodbc.connect(init_string="driver={SQLOLEDB}; server=+ServerName+; database=+MSQLDatabase+; trusted_connection=true")
pyodbc.Error: ('IM002', '[IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnect)')

I have looked at the folowing posts and tried changing my driver to {sql server} and have connected using ODBC links before in SAS, which is partially what my above code is based on, so don't think I need to install anything else.

pyodbc.Error: ('IM002', '[IM002] [unixODBC][Driver Manager]Data source name not found, and no default driver specified (0) (SQLDriverConnect)')

Pyodbc - "Data source name not found, and no default driver specified"

Thanks

This is how I do it...

import pyodbc 
cnxn = pyodbc.connect("Driver={SQL Server Native Client 11.0};"
                      "Server=server_name;"
                      "Database=db_name;"
                      "Trusted_Connection=yes;")


cursor = cnxn.cursor()
cursor.execute('SELECT * FROM Table')

for row in cursor:
    print('row = %r' % (row,))

Relevant resources:

https://github.com/mkleehammer/pyodbc/wiki/Connecting-to-SQL-Server-from-Windows
http://blogs.msdn.com/b/cdndevs/archive/2015/03/11/python-and-data-sql-server-as-a-data-source-for-python-applications.aspx

Minor addition to what has been said before. You likely want to return a dataframe. This would be done as

import pypyodbc 
import pandas as pd

cnxn = pypyodbc.connect("Driver={SQL Server Native Client 11.0};"
                        "Server=server_name;"
                        "Database=db_name;"
                        "uid=User;pwd=password")
df = pd.read_sql_query('select * from table', cnxn)

In data source connections between a client and server there are two general types: ODBC which uses a DRIVER and OLEDB which uses a PROVIDER. And in the programming world, it is a regular debate as to which route to go in connecting to data sources.

You are using a provider, SQLOLEDB, but specifying it as a driver. As far as I know, neither the pyodbc nor pypyodbc modules support Window OLEDB connections. However, the adodbapi does which uses the Microsoft ADO as an underlying component.

Below are both approaches for your connection parameters. Also, I string format your variables as your concatenation did not properly break quotes within string. You'll notice I double the curly braces since it is needed in connection string and string.format() also uses it.

# PROVIDER
import adodbapi
conn = adodbapi.connect("PROVIDER=SQLOLEDB;Data Source={0};Database={1}; \
       trusted_connection=yes;UID={2};PWD={3};".format(ServerName,MSQLDatabase,username,password))
cursor = conn.cursor()

# DRIVER
import pyodbc
conn = pyodbc.connect("DRIVER={{SQL Server}};SERVER={0}; database={1}; \
       trusted_connection=yes;UID={2};PWD={3}".format(ServerName,MSQLDatabase,username,password))
cursor = conn.cursor()

I Prefer this way ... it was much easier

http://www.pymssql.org/en/stable/pymssql_examples.html

conn = pymssql.connect("192.168.10.198", "odoo", "secret", "EFACTURA")
cursor = conn.cursor()
cursor.execute('SELECT * FROM usuario')

Connecting to Microsoft SQL server using Python

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