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Web hosting companies commonly offer MySQL database support PostgreSQL: A free, open source relational database system licensed under the BSD license, making it possible to repackage and sell within commercial products PostgreSQL is often considered to be of higher performance and have better conformity to SQL standards than MySQL, although it s less commonly used Oracle: A commercial relational database system developed by Oracle Corp It s generally used by large businesses for managing extremely large datasets Primary key: A column (or multiple columns) on a table whose data uniquely identifies each row DBI: DataBase Interface A database-agnostic library that makes it easy to communicate between Ruby and database systems SQL: Structured Query Language A language specifically designed to create, amend, retrieve, and otherwise manipulate data in relational database systems ActiveRecord: A library that abstracts databases, rows, columns, and SQL into standard Ruby syntax using classes and objects.

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It s a major part of the Ruby on Rails framework, which is covered in detail in 13..

visuals. Now you can expand on that personal beginning by delivering a presentation that expresses your original voice. Audiences will always prefer a presentation that s imperfect and a little rough around the edges but still authentic over a perfect and awless presentation that has no soul. When you present, never be afraid to be yourself, because that s what people really want you to be.

With the ability to load, manipulate, and store data, the amount of useful Ruby applications you can develop increases significantly. Few applications depend entirely on data typed in every time, and having access to files and databases makes it easy to build powerful systems that can be used over time to manage data. Please note that this is not the last of this book s coverage of Ruby s database features. In 12 we re going to use more of these database features at a deeper level to create a larger application. Next, in 10, we re going to look at how you can release your applications and libraries to the world.

n this chapter we re going to look at how to deploy and distribute the programs you create with Ruby. Developing Ruby applications is so simple that you ll soon want to release them to the world. As covered in 5, Ruby has a proud history of community and sharing, and nearly every Ruby developer will release code or completed applications at some point. Indeed, as Ruby is an interpreted language, the source code has to be distributed whenever you deploy your Ruby applications. If this isn t desired, there are some workarounds, and we ll look at those in this chapter too. In essence, this chapter will walk you through the considerations and processes of deploying Ruby applications, libraries, and remotely accessible services (with HTTP daemons and as CGI scripts).

Before leaving the subject of functional programming, I ll touch upon the built-in function apply. It takes a function as an argument and calls it. You may also optionally supply a tuple of positional parameters and a dictionary of keyword arguments. You use this if you have a tuple (or dictionary) of arguments and want to apply a function to it: >>> def rectangleArea(width, height): return width * height >>> rectangle = 20, 30 >>> apply(rectangleArea, rectangle) 600 However, this function is a bit outdated now that you can simply use the nifty little stars to unpack the arguments (as discussed earlier in this chapter, in the section Collecting Parameters ): >>> rectangleArea(*rectangle) 600 Even though you ll probably rarely use apply, it has been used extensively in older programs, and you never know when you ll have to read someone else s code.