Connecting from Python to SQL Server

Question

I'd like to connect from IPython notebook to a SQL-Server database via integrated security.

Is this possible? I'm guessing yes it is.

How do I format the connection string in the following?

import pandas as pd
import pandas.io.sql as psql
sql = "SELECT * FROM WHdb.dbo.vw_smallTable"
cnx = "Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=True;Initial Catalog=WHdb;Data Source=OurServerName"
data = psql.read_sql(sql, cnx)

This just gives an error. Am I going about the cnx incorrectly?

Solution 1

You need to install the package, pypyodbc

!pip install pypyodbc

Then, you can import it as follows:

import pypyodbc as podbc

You can now create the connection:

conn = podbc.connect("Driver={SQL Server};Server=<YourServer>;Database=<YourDatabase>;uid=<YourUserName>;pwd=<YourPassword>"

Finally, you fetch your data as follows:

cursor = conn.cursor()
sql = "SELECT * FROM WHdb.dbo.vw_smallTable"
cursor.execute(sql)
data = cursor.fetchone()
while data:
    print(str(data[0]) + ", " + ... + ", " + str(data[n-1]))
    data = cursor.fetchone()
conn.close()

Note that n = number of columns in your table.

Solution 2

This is what worked for me well...

import pyodbc

server = 'myserver'

database = 'mydb'

username = 'myusername'

password = 'mypassword'



#Connection String

connection = pyodbc.connect('DRIVER={SQL Server Native Client 11.0};SERVER='+server+';DATABASE='+database+';UID='+username+';PWD='+ password)

cursor = connection.cursor()



#Sample select query

cursor.execute("SELECT @@version;")

row = cursor.fetchone()

while row:

    print row[0]

    row = cursor.fetchone()