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Ruby has powerful input/output (I/O) support, from the ability to create, read, and manipulate files, through to database support, external devices, and network connectivity. These topics are covered in full in this book (primarily in s 9, 14, and 15), but this section presents a basic overview of the most important forms of I/O.
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Ruby s support for file I/O is powerful compared to that of other languages. Although Ruby supports traditional techniques for reading and manipulating files, its object-oriented features and tight syntax offer more exciting possibilities. First, here is the traditional way you d open and read a file (as when using a more procedural language): lines = [] file_handle = File.new("/file/name/here", "r") while line = file_handle.gets lines << line end This example opens a file in read-only mode, and then uses the file handle to read the file line by line before pushing it into an array. This is a reasonably standard technique in, say, C or Pascal. Let s look at a Ruby-specific technique: lines = File.readlines('/file/name/here') Ruby s file handling and manipulation support is particularly deep and extensive, so it s out of the scope of this chapter. However, the preceding examples should have provided a glimpse into what s possible, and files are covered in full in 9 of this book.
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There are several ways to connect to database systems such as MySQL, PostgreSQL, Oracle, SQLite, and Microsoft SQL Server from Ruby. Typically, a driver library is available for each of the main database systems, although these don t come with Ruby by default. You typically install database driver libraries using the RubyGems Ruby library packaging system, or you might need to download and install them manually. Explaining how to use such libraries is beyond the scope of this appendix, but they are covered in full in 9.
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A P P E NDI X A R U B Y P R I M E R A N D R E V I E W F O R D E V E LO P E R S
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Ruby also has a DBI library that can provide a more standardized interface to all the various driver libraries. Because each driver library is mostly based on the official library for each database system, they re extremely inconsistent and differ in their implementation. DBI makes many of the features provided by these drivers available in a consistent manner.
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Note Ruby s DBI library is not exactly like Perl s DBI library, but is heavily influenced by it, and Perl developers will feel at home using it. It s mentioned in 9 of this book.
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Ruby comes with libraries that make accessing data on the Web incredibly easy. At a high level is the open-uri library, which makes it easy to access data from the Web. This example retrieves a web page and returns an array containing all the lines on that page: require 'open-uri' open('http://www.rubyinside.com/').readlines open-uri is a convenience library that provides an open method that allows you to load data from URLs. open returns a File handle (technically a Tempfile object) that works in the same way as any other File object, allowing you to use methods such as readlines to read all the lines of the data into an array. (This topic is covered in significantly more depth in 14.) Ruby also provides lower-level libraries, such as net/http. Here s an example of retrieving a file from a web site and displaying it on the screen: require 'net/http' Net::HTTP.start('www.rubyinside.com') do |http| req = Net::HTTP::Get.new('/test.txt') puts http.request(req).body end
Hello Beginning Ruby reader! This example connects to the web server at www.rubyinside.com and performs an HTTP GET request for /test.txt. This file s contents are then returned and displayed. The equivalent URL for this request is http://www.rubyinside.com/test.txt, and if you load that URL in your web browser, you ll get the same response as this Ruby program. net/http also lets you make requests using other HTTP verbs such as POST and DELETE, and is the most flexible HTTP library for Ruby. As it s included with the standard library, it s usually the first choice for most Ruby developers. Refer to 14 for full information.
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