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Introduction to Database Driven Development, PHP and MySQL
PHP is one of the “scripting languages” of the web. It is an interpreted language, interpreted by the official PHP interpreter, developed specifically for web programming. Because it is very similar to ASP in many ways, chances are that a change from ASP to PHP would not be that difficult for an experienced developer who has been experienced in a C-style language.
PHP, combined with Apache, or another web server handles all the “standard” web server side of development; it checks for requests, it passes them to the appropriate handlers, it sends the required headers, and it finalizes the task.
On its own, PHP is a language capable of very simple things: date functions, file manipulation, math, logic, all the traditional programming language stuff (including some very feature-filled mechanics for topics like string manipulation and date manipulation) – but it does not extend to the power given by database-driven web applications. Fortunately, there are standard libraries such as the MySQL library, which allow you to easily integrate databases into your project.
A database is simply that, a collection of data. MySQL is both a relational database server and query language. It allows users to easily create tables of information, which are sortable by a number of columns, and capable of handling millions of rows of information. Quite impressive when you look at its simplicity.
MySQL (pronounced My Sequel) is an implementation of the popular SQL – “structured query language” – don’t worry if you’ve never heard of SQL – we’ll get to that in a later lesson. Information can be stored in an SQL database and accessed, manipulated, modified and stored quickly in a range of different ways.
But wait, why would we want to store our content in a database? Why not just save it in flat files? It’s an easy question. If by flat files you mean saving them in plain text files and loading them into a PHP powered templating system – the database is faster. If by flat files you mean saving them in HTML files and linking them, you probably already answered your own question. HTML-only websites are messy, often ending up with hundreds of files, each containing, among other things, their own copy of the template. A simple change for an HTML only site can take days to implement, where in a PHP-MySQL powered site it would take minutes.
Moreover, by integrating PHP + MySQL into your project, you open up a range of new uses. In the future, you can set up a web service for a software application to contact your database server and get the content, you can sell your database of content, or you can further manipulate the way the content is stored.
The benefits of a database-driven, script-powered website are numerous, and you’ll realize them more and more as you delve deeper into web development.
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