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DBI is a Perl module, well documented in both online sources and the "Programming the Perl DBI" book by Alligator Descartes, Alistair Carty, Tim Bunce and Linda Mui (O'Reilly, ISBN:1565926994) but still, I can see questions about using DBI with Oracle on Oracle USENET groups. Oracle has many features and data types, while using DBI with each particular feature is not always entirely trivial.The purpose of this article is to cover many of those uses from Perl practitioner's point of view.So, how do we tell that DBI and DBD:: Oracle are installed and how do we tell which versions are installed?

Therefore, some knowledge of both Oracle and Perl is assumed, and although I will not try to show off my obfuscation abilities, this article still assumes that the reader has read "Learning Perl" and has some experience with Oracle RDBMS.In writing this article I was relying mostly on the experience, scripts and sins of the past and online documentation.The most accurate and up to date online DBI documentation can always be found on CPAN (The 2nd and 3rd arguments are, of course, username and password.Of course, everyone who has ever worked with databases knows that connection errors happen from time to time, so it is prudent to check for errors: In case of connection error, database handle $dbh is not created and the error string "errstr" comes from the DBI class itself.

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