pyodbc on Azure

Question

I have a python webapp in Azure which I would like to read from an SQLServer also in Azure in the same resource group. Following this example Connecting to Microsoft SQL server using Python, I have added pyodbc to my requirements.txt, the deployment to Azure fails complaining that it doesn't have the correct version of C++ redistributable (9.0) available. Is there anything that can be done about this, or is a different architecture required (and if so, which?)?

Answer 1

I tried to access Azure SQL Database in my flask web app. You could refer to my working code.

view.py

from datetime import datetime
from flask import render_template
from jaygongflask import app
import pyodbc

@app.route('/database')
def database():
    """Renders the about page."""
    cnxn = pyodbc.connect('DRIVER={ODBC Driver 13 for SQL Server};SERVER=***.database.windows.net;DATABASE=***;UID=***;PWD=***')
    cursor = cnxn.cursor()
    cursor.execute("select * from dbo.Student")
    row = cursor.fetchall()
    #for r in row:
     #   print r
    return render_template(
        'database.html',
        title='Database',
        year=datetime.now().year,
        message='Database query result.',
        queryResult = row
    )

web.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="WSGI_HANDLER" value="jaygongflask.app"/>
    <add key="PYTHONPATH" value="D:\home\site\wwwroot"/>
    <add key="WSGI_LOG" value="D:\home\LogFiles\wfastcgi.log"/>
  </appSettings>
  <system.webServer>
    <handlers>
      <add name="PythonHandler" path="*" verb="*" modules="FastCgiModule" scriptProcessor="D:\home\Python361x64\python.exe|D:\home\Python361x64\wfastcgi.py" resourceType="Unspecified" requireAccess="Script"/>
    </handlers>
  </system.webServer>
</configuration>

Install pyodbc package

My web app works with python361x64 extension. Please refer to the steps I did as below:

Step 1 : Create azure web app and add Extensions(here is Python 3.6.1 x64)

Step 2 : Publish your flask project and add the web.config.

web.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="WSGI_HANDLER" value="<Your Project Name>.app"/>
    <add key="PYTHONPATH" value="D:\home\site\wwwroot"/>
    <add key="WSGI_LOG" value="D:\home\LogFiles\wfastcgi.log"/>
  </appSettings>
  <system.webServer>
    <handlers>
      <add name="PythonHandler" path="*" verb="*" modules="FastCgiModule" scriptProcessor="D:\home\Python361x64\python.exe|D:\home\Python361x64\wfastcgi.py" resourceType="Unspecified" requireAccess="Script"/>
    </handlers>
  </system.webServer>
</configuration>

Step 3: Switch to the Kudu CMD and commands cd Python361x64 and touch get-pip.py and copy the content of the url https://bootstrap.pypa.io/get-pip.py into the get-pip.py via Edit button, then run python get-pip.py to install the pip tool.

Step 4 : Install pyodbc package or any packages you need via python -m pip install pyodbc

More deployment details , please refer to this tutorial.

Get query result

Access the url http://***.azurewebsites.net/database .

Hope it helps you.Any concern, please let me know.