Web Applications Used For Creation Dynamic Sites.
In this article we will talk about creating dynamic web sites, which web pages are generated or formed from data stored on the server database.
Nowadays different web applications are used for creation dynamic sites. For development web applications it is used different technologies for creating dynamic Web pages. Dynamic sites are able to respond to user input, i.e. they can be interactive, and that is why dynamic sites, as a rule, are interactive.
Two approaches are used for development of web applications:
On the basis of compiled modules;
On the basis of interpreted scripts.
The compiled modules – are the modules of type CGI, which are transmitted in the executable files and run by a web server. The first web applications for creation dynamic sites were separate modules CGI (scripts, created mainly in the language Perl), which were executed on the server. CGI-scripts are ordinary programs. The result of module implementation is the page in HTML.
You can download in the Internet free modules CGI or CGI-scripts (guest books, feedback, links, site search, etc.) that run on Web-server at user’s request. On the other hand Common Gateway Interface (CGI) – is a standard interface of data exchange, which determines the way of interaction between the client application and web server. CGI provides a launch of the script on the server and interact with them. In the future, for the implementation of this approach people began to apply interfaces (server extensions) ISAPI and NSAPI.
The approach is based on the interpreted scripting. In this case, server-side scripts (scripting languages) are used for creating a site. The script code, as HTML code, is an interpreted code, so HTML and scripts can be combined. The most popular languages of server-side scripting are: Perl, ASP, JSP, PHP, Cold Fusion, and Python.
Scripts interact with objects on the server and generate output information in the HTML. The type of server script is determined by the file name extension (php, asp, aspx, jsp, cfm). If the Web-server receives a request to the page of this type, it interprets all the scripts contained in it, as a result it is generated a Web page in HTML, which is passed back to the browser.
The most popular technologies of creation dynamic web pages are: CGI, PHP, ASP, ASP.NET, JSP, Cold Fusion, AJAX, Python, and CSS, database DB2, MsSQL, Oracle, Access, etc.
Depending on the task, one or other server-side scripting language is chosen for creation a website. For small and medium sized interactive sites it is advisable to apply a scripting language PHP. The contenders of PHP are the technologies ASP, JSP, Cold Fusion, and Perl. The advantage of PHP language is that it is free, has open source and runs on almost all platforms.
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