By Brent Michalski
ISBN-10: 0764549561
ISBN-13: 9780764549564
This is your in-depth advisor to making database-driven functions utilizing Perl.In this authoritative reference, Perl specialist Brent Michalski makes use of lots of examples that will help you grasp Perl's features in database purposes with MySQL, PostgreSQL, and Oracle. alongside the best way, he explores sensible functions for state-of-the-art applied sciences like XML and net providers. in case you are a Perl beginner, the excellent code samples and step by step causes may have you writing database functions quick and with a bit of luck. if you are skilled, this definitive guidebook has every thing you want to movement forward with internet programming, challenge monitoring, automated e mail reviews, and masses more.You'll find out how to:* comprehend various database versions, DBIs, and DBDs* arrange relational databases, retrieve info, and generate experiences* Tie a Perl hash to a database and song clients with cookies* Generate and convey computerized email stories* Use tied hashes to create Web-based procuring carts* deal with binary facts and publish BLOB information* Create phonebooks, photograph albums, and a SOAP-based catalogThe spouse website gains resource code from the e-book and different necessary details.
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Extra info for Perl Database Programming
Example text
310pp. 95 Paperback, 641pp. Wrox Press, Inc. March 1997 Counting Your Matches We've seen a couple different ways to select data. What if we don't want all of that data but instead want just the number of items that match? SQL has a COUNT function for this purpose. 01: "DBI:mysql:BibleBook","bookuser","testpass") 10: or die("Cannot connect: $DBI::errstr"); Lines 1-10 are again very similar to the other program listings in this chapter. 11: my $sql = qq(SELECT COUNT(*) FROM library); Line 11 is our SQL statement that uses the COUNT function.
Map performs the function(s) inside of the curly bars, {}, on each member of the array that is passed to the map function. So, you are easily able to transform every item in an array with map. = "$key = ‘$vals[$counter]', "; 41: $counter++; 42: } 43: $sql =~ s{, $}{ WHERE isbn = ‘$old_isbn'}; Line 37 begins the code we use to construct the SQL statement needed to update the database. This line declares a my variable named $sql and stores the first part of the SQL statement in it. Chapter 5: Making Changes to Your Data 55 56 Chapter 5: Making Changes to Your Data Line 38 creates a variable named $counter and initializes it to 0.
Try these example programs, and try to change them so that you can get different data and see how it all works. Try things like changing the SELECT * statements so you get only specific fields. Or change the code so that the output from the programs is much nicer. Don't be afraid to change the code and to experiment; you won't break the computer! Although being able to get data from the database is nice, we are ready to move to the next level-manipulating the data in the database. The next section shows you how to add records, delete records, and update existing records.
Perl Database Programming by Brent Michalski
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