Django Hello World - MySQL Windows Edition

This tutorial describes how to use MySQL in conjunction with Django on a single Windows Azure virtual machine. This guide assumes that you have some prior experience using Windows Azure and Django. For an introduction to Windows Azure and Django, see [Django Hello World] djangohelloworld. The guide also assumes that you have some knowledge of MySQL. For an overview of MySQL, see the MySQL web site.

In this tutorial, you will learn how to:

Setup a Windows Azure virtual machine to host MySQL and Django. While this tutorial explains how to accomplish this under Windows Server 2008 R2, the same could also be done with a Linux VM hosted in Windows Azure.
Install a [MySQL driver] mysqlpy for Python.
Configure an existing Django application to use a MySQL database.
Use MySQL directly from Python.
Host and run your MySQL Django application.

You will expand upon the [Django Hello World] djangohelloworld sample by utilizing a MySQL database, hosted in a Windows Azure VM, to find an interesting replacement for World. The replacement will in turn be determined via a MySQL-backed Django counter app. As was the case for the Hello World sample, this Django application will again be hosted in a Windows Azure Preview Portal virtual machine.

The project files for this tutorial will be stored in C:\django\helloworld and the completed application will look similar to:

Setting up a virtual machine to host MySQL and Django

Follow the instructions given here to create a Windows Azure Preview Portal virtual machine of the Windows Server 2008 R2 flavor.
Open up a TCP port for MySQL transactions on the virtual machine:

Navigate to your newly created virtual machine in the Windows Azure Preview Portal and click the ENDPOINTS tab.
Click ADD ENDPOINT button at the bottom of the screen.
```
 ![][6]
```
Open up the TCP protocol's PUBLIC PORT 3306 as PRIVATE PORT 3306.
```
 ![][8]
```

Duplicate the previous ENDPOINT addition, this time opening up TCP's PUBLIC PORT 80 as PRIVATE PORT 80. This redirects external Internet requests to the port Django runs on, namely 80.
Use Windows Remote Desktop to remotely log into the newly created Windows Azure virtual machine.
Open up TCP port 80 on the virtual machine:

From the Start menu, select Administrator Tools and then Windows Firewall with Advanced Security.
In the left pane, select Inbound Rules. In the Actions pane on the right, select New Rule....
In the New Inbound Rule Wizard, select Port and then click Next.
Select TCP and then Specific local ports. Specify a port of "80" (the port Django listens on) and click Next.
Select Allow the connection and click Next.
Click Next again.
Specify a name for the rule, such as "DjangoPort", and click Finish.

Install the latest version of [MySQL Community Server] mysqlcommunity for Windows on the virtual machine:

Note: we recommend installing your DB on a different data partition than the OS.

Run the Windows (x86, 64-bit), MSI Installer link [here ] mysqlcommunity and download the appropriate MSI installer from the download mirror nearest you. Helpful hints are:
- Select a Complete Setup Type.
- Select a Detailed Configuration within the Configuration Wizard.
- Make sure you enable TCP/IP Networking on Port Number 3306 and add a firewall exception for the port.
- Set a root password and enable root access from remote machines.
Install a sample ["world" database] mysqlworld (MyISAM version):
- Download [this] mysqlworlddl zip file on the Windows Azure Virtual Machine.
- Unzip it to C:\Users\Administrator\Desktop\world.sql.

After installing MySQL, click the Windows Start menu and run the freshly installed MySQL 5.5 Command Line Client. Issue the following commands:

 CREATE DATABASE world;
 USE world;
 SOURCE C:\Users\Administrator\Desktop\world.sql
 CREATE USER 'testazureuser'@'%' IDENTIFIED BY 'testazure';
 CREATE DATABASE djangoazure;
 GRANT ALL ON djangoazure.* TO 'testazureuser'@'%';
 GRANT ALL ON world.* TO 'testazureuser'@'%';
 SELECT name from country LIMIT 1;

You should now see a response similar to the following:

Before you can begin developing your Django application, we of course need to install Python+Django on the virtual machine. To that effect, follow the [Setup the Development Environment] wapstarted guide in the Python "Hello World" Application tutorial.

Note: you merely need to install the Django product from WebPI to get this tutorial working. You do not need Python Tools for Visual Studio or even the Windows Azure Python SDK installed for our purposes.

Install the MySQL Python client package. You can install it directly [from this link] mysqlpydl. Once completed, run the following command to verify your installation:

Extend the Django Hello World application

Follow the instructions given in the [Django Hello World] djangohelloworld tutorial to create a trivial "Hello World" web application in Django.

Open C:\django\helloworld\helloworld\settings.py in your favorite text editor. Modify the DATABASES global dictionary to read:

 DATABASES = {
     'default': {
 	    'ENGINE': 'django.db.backends.mysql',
 	    'NAME': 'djangoazure',               
 	    'USER': 'testazureuser',  
 	    'PASSWORD': 'testazure',
 	    'HOST': '127.0.0.1', 
 	    'PORT': '3306',
 	    },
     'world': {
 	    'ENGINE': 'django.db.backends.mysql',
 	    'NAME': 'world',               
 	    'USER': 'testazureuser',  
 	    'PASSWORD': 'testazure',
 	    'HOST': '127.0.0.1', 
 	    'PORT': '3306',
 	    }
 	}

As you can see, we've just given Django instructions on where to find our MySQL database.

Note: you must change the HOST key to match your Windows Azure (MySQL) VM's permanent IP address. At this point, HOST should be set to whatever the ipconfig Windows command reports it as being.

After you've modified HOST to match the MySQL VM's IP address, please save this file and close it.

Now that we've referenced our djangoazure database, let's do something useful with it! To this end, we'll create a model for a trivial counter app. To instruct Django to create this, run the following commands:
```
 cd C:\django\helloworld
 C:\Python27\python.exe manage.py startapp counter
```

If Django doesn't report any output from the final command above, it succeeded.

Append the following text to C:\django\helloworld\counter\models.py:

 class Counter(models.Model):
     count = models.IntegerField()
     def __unicode__(self):
         return u'%s' % (self.count)

All we've done here is defined a subclass of Django's Model class named Counter with a single integer field, count. This trivial counter model will end up recording the number of hits to our Django application.

Next we make Django aware of Counter's existence:

Edit C:\django\helloworld\helloworld\settings.py again. Add 'counter' to the INSTALLED_APPS tuple.

From a command prompt, please run:

 	cd C:\django\helloworld
 	C:\Python27\python manage.py sql counter
 	C:\Python27\python manage.py syncdb

These commands store the Counter model in the live Django database, and result in output similar to the following:

 C:\django\helloworld> C:\Python27\python manage.py sql counter
 BEGIN;
 CREATE TABLE `counter_counter` (
 	`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
     `count` integer NOT NULL
 )
 ;
 COMMIT;
 
 C:\django\helloworld> C:\Python27\python manage.py syncdb
 Creating tables ...
 Creating table auth_permission
 Creating table auth_group_permissions
 Creating table auth_group
 Creating table auth_user_user_permissions
 Creating table auth_user_groups
 Creating table auth_user
 Creating table django_content_type
 Creating table django_session
 Creating table django_site
 Creating table counter_counter
 
 You just installed Django's auth system, which means you don't have any superusers defined.
 Would you like to create one now? (yes/no): no
 Installing custom SQL ...
 Installing indexes ...
 Installed 0 object(s) from 0 fixture(s)

Replace the contents of C:\django\helloworld\helloworld\views.py. The new implementation of the hello function below uses our Counter model in conjunction with a separate sample database we previously installed, world, to generate a suitable replacement for the "World" string:

 from django.http import HttpResponse
 import django.db
 from counter.models import Counter
 
 def getCountry(intId):
     #Connect to the MySQL sample database 'world'
     cur = django.db.connections['world'].cursor()
     #Execute a trivial SQL query which returns the name of 
     #all countries contained in 'world'
     cur.execute("SELECT name from country")
     tmp = cur.fetchall()
     #Clean-up after ourselves
     cur.close()
     if intId >= len(tmp):
         return "countries exhausted"
     return tmp[intId][0]
 
 def hello(request):
     if len(Counter.objects.all())==0:
         #when the database corresponding to 'helloworld.counter' is 
         #initially empty...
         c = Counter(count=0)
     else:
         c = Counter.objects.all()[0]
         c.count += 1
     c.save()	   
     world = getCountry(int(c.count))
     return HttpResponse("<html><body>Hello <em>" + world + "</em></body></html>")

Deploying and running your Django web site

Note: The following shows how to run Django in a test environment. To run it in production, follow the "Setting up IIS with FastCGI" section in the "Django Hello World tutorial". Using the Windows Firewall Client to open port 80 to Internet traffic on the Windows Server 2K8 R2 virtual machine is not necessary with FastCGI.

Switch back to a Windows PowerShell window, and type the following commands to deploy your Django web site publically:

PS C:\django\helloworld> $ipPort = [System.Net.Dns]::GetHostEntry("127.0.0.1")
PS C:\django\helloworld> $ipPort = [string]$ipPort.AddressList[1]
PS C:\django\helloworld> $ipPort += ":80"
PS C:\django\helloworld> C:\Python27\python.exe .\manage.py runserver $ipPort

The runserver parameter instructs Django to run our helloworld web site on TCP port 80. The results of this command should be similar to:

PS C:\django\helloworld> C:\Python27\python.exe .\manage.py runserver $ipPort
Validating models...

0 errors found
Django version 1.4, using settings 'helloworld.settings'
Development server is running at http://123.34.56.78:80
Quit the server with CTRL-BREAK.

From your local web browser, open http://yourVmName.cloudapp.net (where yourVmName is whatever name you used in the virtual machine creation step). You should see "Hello ... !" displayed as shown in the screenshot below. This indicates that Django is running in the virtual machine and is working correctly.

Refresh the web browser a few times and you should see the message change from "Hello <country abc>" to "Hello <some other country>".

To stop Django from hosting the web site, simply switch to the PowerShell window and press CTRL-C.

Shutting down your Windows Azure virtual machine

When you're done with this tutorial, shutdown and/or remove your newly created Windows Azure virtual machine to free up resources for other tutorials and avoid incurring Windows Azure usage charges.

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Django Hello World - MySQL Windows Edition

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Django Hello World - MySQL Windows Edition

Setting up a virtual machine to host MySQL and Django

Extend the Django Hello World application

Deploying and running your Django web site

Shutting down your Windows Azure virtual machine