Server Side Database Search · Server side Database Serach Fundamental Research Group,IIT Bombay...

Server side Database Serach Fundamental Research Group,IIT Bombay

Server Side Database Search

Charu Sharma

Fundamental Research GroupIIT Bombay

Charu Sharma (IIT Bombay) 1 / 26


Introduction

Django developers create features so that programmers need not to switchbetween PYTHON and SQL



Searching on Client and Server side

Persistence

1 Server side database offers persistence

2 Client side in-memory database does not offer upto that extent whatserver side does

ScalingA Database is designed so that performance will not take too much of hit ifit grows ten times bigger but this is not the case with in-memory database.



Handling databases through Django models

Django can use any of the packages like psycopg2 and sqlite3.Code forsqlite3 connection is here:edit in settings.py

DATABASES = {

’default’: {

’ENGINE’: ’django.db.backends.sqlite3’,

’NAME’: ’/home/user/Documents/mysite/sqlite3.db’



EXAMPLE:Registration Form



Source Code Of Example

1 Go into the mysite/myapp directory, and create the directorytemplates. Enter the templates directory.

2 Create a template file named insregis.html. containing the followingtemplate:

<html>

</body>

<form action="" method="post">

{% csrf_token %}

<h3>Username :</h3>{{registration_form.username}}

<h3>Password :</h3>{{registration_form.password}}

<h3>Confirm Password :</h3>{{registration_form.confirmpassword}}

<h3>City :</h3>{{registration_form.city}}

<input type="submit" value="Register"/>

</form>

</body>

</html>Charu Sharma (IIT Bombay) 10 / 26


models.py

Add models in models.py file

from django.db import models

CITY_CHOICES=(

(’Bangalore’,’Bangalore’),

(’Delhi’,’Delhi’),

(’Pune’,’Pune’),

(’Mumbai’,’Mumbai’),

)

class Registration(models.Model):

username=models.CharField(max_length=100)

password=models.CharField(max_length=100)

confirmpassword=models.CharField(max_length=100)

city=models.CharField(max_length=100,choices=CITY_CHOICES)



forms.py

Then create the forms.py file containing the following:

from django.forms import ModelForm,Textarea

from models import Registration

from django import forms

class RegistrationForm(ModelForm):

class Meta:

model=Registration

fields=[’username’,’password’,’confirmpassword’,’city’]

widgets={

’password’:forms.PasswordInput(),

’confirmpassword’:forms.PasswordInput()

}



views.py

Then create the views.py file containing the following:

from django.shortcuts import render_to_response,render

from django.template import RequestContext

from django.http import HttpResponseRedirect,HttpResponse

from models import Registration

from forms import RegistrationForm

from django.views.decorators.csrf import csrf_exempt

from django.contrib.auth.forms import AuthenticationForm,authenticate

def register(request):

if request.method == ’POST’:

registration_form=RegistrationForm(data=request.POST)

if registration_form.is_valid():

if request.POST.get(’password’)!=request.POST.get(’confirmpassword’):

return HttpResponseRedirect(’/myapp/register’)



else:

if Registration.objects.filter(username=request.POST.get(’username’)).count()!=0:


registration_form.save()

request.session[’userrname’]=request.POST.get(’username’)

request.session[’passsword’]=request.POST.get(’password’)

request.session[’confirmmpassword’]=request.POST.get(’confirmpassword’)

request.session[’cityy’]=request.POST.get(’city’)

return HttpResponseRedirect(’/myapp/submit’)

else:


else:

registrationform={’registration_form’:RegistrationForm}

return render_to_response(’ins_regis.html’,registrationform,context_instance=RequestContext(request))



def submit(request):

state = "You have registered successfully"

return render_to_response(’submit.html’,context_instance=RequestContext(request))

@csrf_exempt

def view(request):

obj_info=Registration.objects.filter(username=request.session.get(’userrname’))

user_data ={"user_detail" : obj_info}

return render_to_response(’search.html’,user_data,context_instance=RequestContext(request))

@csrf_exempt

def detailall(request):

obj_info1 = Registration.objects.filter()

user_data1 ={"user_detail1" : obj_info1}

return render_to_response(’userdetail.html’,user_data1,context_instance=RequestContext(request))



@csrf_exempt

def search1(request):

if request.method == ’POST’:

usersearch_form=RegistrationForm(data=request.POST)

if Registration.objects.filter(username=request.POST.get(’username’)).count()==0:

return HttpResponseRedirect(’/myapp/search1’)

else:

form = AuthenticationForm(request.POST)

u = request.POST[’username’]

user = authenticate(username=u)

if user is not None:

if user.is_active:

login(user)

else:

message = ’disabled account’

return render(request,’submit.html’, {’message’: message})



user_info=Registration.objects.filter(username=request.POST.get(’username’))

user_data1 ={"user_detail1" : user_info}

return render_to_response(’submit.html’,user_data1,context_instance=RequestContext(request))

else:

usersearchform={’usersearch_form’:RegistrationForm}

return render_to_response(’submit.html’,usersearchform,context_instance=RequestContext(request))



urls.py

Go up one level to the myapp directory and edit the urls.py file so that thefirst line after

from django.conf.urls import patterns,url

from myapp import views

from mysite import settings

urlpatterns = patterns(’’,

url(r’^register$’,views.register,name=’register’),

url(r’^submit$’,views.submit,name=’submit’),

url(r’^view$’,views.view,name=’view’),

url(r’^search1$’,views.search1,name=’search1’),

url(r’^detailall$’,views.detailall,name=’detailall’),

)



settings.py

Edit settings.py file, and add:

DATABASES = {

default: {

ENGINE: django.db.backends.sqlite3,

NAME: /home/user/Documents/mysite/sqlite3.db

Enable myapp by adding the below code in INSTALLEDAPPS

myapp,



urls.py

Edit urls.py file in mysite directory, and include myapp.urls:

from django.conf.urls import patterns, include, url

from mysite import settings

urlpatterns = patterns(,

url(r^myapp/, include(myapp.urls)),

)



Run

Then, from the command line, run:

python manage.py syncdb

python manage.py runserver 0.0.0.0:9000

http://localhost:9000/myapp/register



submit.html

To display the registered user details click on View button.

<!DOCTYPE html>

<html>

<body>

<h3 style="margin-bottom:0;">You have registered successfully!!</h3>

<form action="/myapp/view" method="post">

<input type="submit" value="Current User Details"/>

</form>

<form action="/myapp/detailall" method="post">

<input type="submit" value="All Details"/>

</form>



<form action="/myapp/search1" method="post">

{% csrf_token %}

<input type="text" name="username" value="{{ usersearch_form.username }}"/>

<input type="submit" value="Search"/>

{% for detail in user_detail1 %}

<h4>Username:</h4><tr><td>{{ detail.username }}</td></tr></br>

<h4>Password:</h4><tr><td>{{ detail.password }}</td></tr></br>

<h4>Confirm Password:</h4><tr><td>{{ detail.confirmpassword }}</td></tr></br>

<h4>City :</h4><tr><td>{{ detail.city }}</td></tr></br>

{% endfor %}

</form>

</body>

</html>



search.html

Here are the details of the current user

<html><body>

<form>{% csrf_token %}

<h3>Data fetched from Database</h3>

{% for detail in user_detail %}

<h5>Username :</h5><tr><td>{{ detail.username }}</td></tr></br>

<h5>Password :</h5><tr><td>{{ detail.password }}</td></tr></br>

<h5>Confirm Password :</h5><tr><td>{{ detail.confirmpassword }}</td></tr></br>

<h5>City :</h5><tr><td>{{ detail.city }}</td></tr></br>

{% endfor %}

<h3>Data fetched from Session</h3>

<h5>Username :</h5>{{ request.session.userrname }}

<h5>Password :</h5>{{ request.session.passsword }}

<h5>Confirm Password :</h5>{{ request.session.confirmmpassword }}

<h5>City :</h5>{{ request.session.cityy }}</form>

</body></html>Charu Sharma (IIT Bombay) 24 / 26


userdetail.html

Here are the details of all the users

<html><body>

<form>{% csrf_token %}

<table border="1px">

<tr><td><h3>Username:</h3></td>

<td><h3>Password:</h3></td>

<td><h3>Confirm Password:</h3></td>

<td><h3>City :</h3></td></tr>

{% for detail in user_detail1 %}

<tr><td>{{ detail.username }}</td>

<td>{{ detail.password }}</td>

<td>{{ detail.confirmpassword }}</td>

<td>{{ detail.city }}</td></tr></br>

{% endfor %}

</table>

</body></html>Charu Sharma (IIT Bombay) 25 / 26


A TOUR OF D JANGO PERSISTENCE FACILITIES

Django handles ORM


Server Side Database Search · Server side Database Serach Fundamental Research Group,IIT Bombay...

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