September 2012
Beginner
744 pages
15h 48m
English
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Chapter 16
Databases
WHAT YOU WILL LEARN IN THIS CHAPTER:
- Understanding Perl’s DBI module
- Connecting to databases
- Selecting data from databases
- Using binding parameters
- Changing your data
- Using transactions
WROX.COM CODE DOWNLOAD FOR THIS CHAPTER
The wrox.com code downloads for this chapter are found at http://www.wrox.com/remtitle.cgi?isbn=1118013847 on the Download Code tab. The code for this chapter is divided into the following major examples:
- example_16_1_fetch.pl
- lib/MyDatabase.pm
- listing_16_1_make_database.pl
- listing_16_2_populate_database.pl
- listing_16_3_select.pl
A database is a place to store your data. It can be a regular file, a sheet of paper, or a hierarchical database such as IMS (no longer widely used). Today, when most people say “database,” they’re referring to what most people call relational databases. If you have a background in programming, you’ve probably heard of several of them, such as MySQL, PostgreSQL, Oracle, Sybase, and many others. Each of these offers a variety of different features, some favoring data integrity, others focused on performance, and some striving for both.
In this chapter you acquire a minimum knowledge of using databases in Perl. You will use the SQLite database and Perl’s DBI module. I chose SQLite because it’s easy to install and Perl’s DBI module because it is the standard for connecting to databases. There are other tools, such as object-relational mappers (ORMs) that try to hide some of the complexity of databases, but under ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.