Web Services

Webservice are required with mobile development.There are no of method through which you can create you web service.
1. REST (Representational State Transfer)
2. SOAP (Simple Object Access Protocol)
3. XML-RPC (Remote Procedure Call uses XML)

Let ‘s give you some overview of the types.
1. REST (Representational State Transfer) : REST Web Services consist of using plain HTTP to make method calls and you get XML or JSON in response.Create webservice using REST is very easy and take less time to make as compare to other.
REST support all most commonly used HTTP methods (GET : Read, POST : Create, PUT : Update and DELETE : Delete).
2. SOAP (Simple Object Access Protocol): SOAP is Simple Object Access Protocol based on XML so it easy to read. It is simple XML based protocol to exchange data between two different language.
3. XML-RPC (Remote Procedure Call uses XML) : XML-RPC protocol is really simple. You pass requests which contain the method name, and parameters formatted in xml that defines their data types. The response comes back with similar xml data.
Here I am going to explain you how to create a basic web service using REST.In this application we can create a user , get user info,update user and delete user.
REST Web services

REST (REpresentational State Transfer) is an architectural style, and an approach to communications that is often used in the development of Web services. The use of REST is often preferred over the more heavyweight SOAP (Simple Object Access Protocol) style because REST does not leverage as much bandwidth, which makes it a better fit for use over the Internet. The SOAP approach requires writing or using a provided server program (to serve data) and a client program (to request data).

REST is often used in mobile applications, social networking Web sites, mashup tools, and automated business processes. The REST style emphasizes that interactions between clients and services is enhanced by having a limited number of operations (verbs). Flexibility is provided by assigning resources (nouns) their own unique Universal Resource Identifiers (URIs). Because each verb has a specific meaning (GET, POST, PUT and DELETE), REST avoids ambiguity.

Web services is one of the most important part of today development where we centralized or data and allow user to access that data from different sources like mobile app,web etc.

Before creating this web service you have basic knowledge about PHP,Mysql and JSON.
1. Install XAMPP OR WAMP in your system.
2. Now you need to create database. Here we create test database and create user table. (copy below code and paste in sql query)
3. Create webservice folder Suppose are you using WAMP server then create like this folder D:/wamp/www/webservice Or For XAMPP server : D:\xampp\htdocs\webservice
4. Create file db_config.php for database configuration.In this file we need to connection to our database.
db_config.php :

5. Now we can create a file to save requested data to database.
create.php :

6. In above code we did not add any validation you can add also validation code.
7. Now we need to install chrome extension for test web service. Here I am using Advanced REST client (https://chrome.google.com/webstore/detail/advanced-rest-client/hgmloofddffdnphfgcellkdfbfbjeloo).
8. Now go to your chrome app store. Click on Advanced REST client.Now add your requests.
Here my url is http://localhost:8081/webservice/create.php

Now we get user information using GET method.I create new php file (select.php) to get user information.
1. select.php

URL : http://localhost:8081/webservice/select.php?id=1
Now we update user information using PUT method.I create new php file (update.php) to update user information.
1. update.php

We get PUT method value by $_SERVER['HTTP_VARIBLENAME'].

Now we delete user information using DELETE method.I create new php file (delete.php) to delete user.
1. delete.php

Thank you! enjoy coding … :)


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