2. Creating iOS / Android
application with SQL Server
as database
Jihin Raju
jihinraju@gmail.com
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3. Work flow of a web application with SQL server
as database

4. Browser Web Server SQL Server
Username
Password
Log In
Data rqt.
1 2 3
1. When user submits a form/makes a request that will get forwarded to
web server by browser.
Web
application

5. Browser Web Server SQL Server
Username
Password
Log In
Data rqt. Data rqt.
1 2 3
2. Then the web server will request the SQL Server for required data.
Web
application

6. Browser Web Server SQL Server
Username
Password
Log In
Data rqt. Data rqt.
Data resp.
1 2 3
3. According to the query/request , SQL server will send the data back to
the web server (Application) as a response.
4. And then we can arrange or perform operations on that data from the
webserver.
Web
application

7. Browser Web Server SQL Server
Username
Password
Log In
Data rqt. Data rqt.
Data resp.HTML
1 2 3
5. After all the operations in our program webserver sends the HTML code
back to the browser.
Web
application

8. When we need to build another application that also uses the same database
and data like Android/iOS applications, we will have to build an interface
between the new platform application and the existing web application., this
interface is called API.
It is not recommended to connect directly to the SQL server from
iOS/Android because it will not be able to make a sudden change in business
logic or data manipulation as the application is in clients device. If it is accessed
through the web service then we can make changes to the web service at any
point of time and it is a painless way for users too.
SQL Server

9. In this case we can create API using web service in the web application ,
and we can access that web service from any other platforms/applications. The main
thing we have to be careful about is the method that we are going to use for
communication between the API and the application. As we are building the
application in different language and different platform we need a common
language/method of transferring data. That are JSON/XML methods.
The most used method is JSON data., JSON is a method that wraps a data into an
object with a key-value pair. And for most of the programming languages, libraries
that supports JSON are available.

10. Work Flow of iOS/Android Application With
SQL Server As Database

11. Browser
Web Server
SQL Server
Username
Password
Log In
Data rqt.
Data rqt.
Data resp.
HTML
API
(Web Service)
Web
application
HTTP request (+ data)
JSON data

12. Things you should learn before creating a different platform
application ( like iOS/Android)
1. What is web service and how to create a public web service
2. Manipulating JSON data.
3. Accessing web service from other applications using HTTP protocol (using
libraries).

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