Download E-books Learning Perl PDF

By brian d foy, Tom Phoenix

If you are simply getting began with Perl, this can be the ebook you want—whether you are a programmer, process administrator, or net hacker. Nicknamed "the Llama" by way of generations of clients, this bestseller heavily follows the preferred introductory Perl path taught through the authors on account that 1991. This sixth variation covers contemporary alterations to the language as much as model 5.14.

Perl is appropriate for nearly any job on nearly any platform, from brief fixes to accomplish net functions. Learning Perl teaches you the fundamentals and exhibits you ways to write down courses as much as 128 traces long—roughly the dimensions of ninety% of the Perl courses in use this present day. each one bankruptcy comprises routines that will help you perform what you've got simply realized. different books may possibly train you to software in Perl, yet this ebook will flip you right into a Perl programmer.

Topics include:

  • Perl information and variable types
  • Subroutines
  • File operations
  • Regular expressions
  • String manipulation (including Unicode)
  • Lists and sorting
  • Process management
  • Smart matching
  • Use of 3rd occasion modules

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Li( "$param: " . param($param) ); } print ul( $list_items ); print end_html(); Wasn’t that simple? You don’t need to understand how CGI. pm is doing all these items; you simply need to belief that it does it competently. when you permit CGI. pm do all of the exertions, you get to target the attention-grabbing components of your application. The CGI. pm module does much more: it will possibly deal with cookies, redirection, multipage varieties, and much more. We don’t have room to hide it the following, yet you’ll research extra from the examples within the module documentation. * The module has numerous different export tags to choose various teams of features. for example, if you'd like those that care for simply the CGI, you should use :cgi, or in case you simply wish the HTML iteration features, you should use :html4. See the CGI. pm documentation for extra info. 176 | bankruptcy 11: Perl Modules Databases and DBI The DBI (Database Interface) module doesn’t include Perl, yet it’s the most well known modules when you consider that most folks need to connect with a database of a few type. The great thing about DBI is that it permits you to use an identical interface for almost any universal database, from uncomplicated comma-separated worth documents to important database servers like Oracle. It has ODBC drivers, and a few of its drivers are even seller supported. To get the entire information, get Programming the Perl DBI by means of Alligator Descartes and Tim Bunce (O’Reilly). you may as well try out the DBI website at http://dbi. perl. org/. when you set up DBI, you furthermore mght need to set up a DBD (Database Driver). you may get a lengthy record of DBDs from CPAN seek. set up definitely the right one in your database server, and make sure that you get the model that is going with the model of your server. The DBI is an object-oriented module, yet you don’t need to understand every little thing approximately OO programming to exploit it. you simply need to stick with the examples within the documentation. to hook up with a database, you employ the DBI module, then name its attach strategy: use DBI; $dbh = DBI->connect($data_source, $username, $password); The $data_source includes info specific to the DBD that you really want to take advantage of, so you’ll get that from the DBD. For PostgreSQL, the motive force is DBD::Pg, and the $data_source is whatever like: my $data_source = "dbi:Pg:dbname=name_of_database"; when you hook up with the database, you battle through a cycle of getting ready, executing, and analyzing queries. $sth = $dbh->prepare("SELECT * FROM foo the place bla"); $sth->execute(); @row_ary = $sth->fetchrow_array; $sth->finish; if you are entire, you disconnect from the database. $dbh->disconnect(); There are every type of different issues that the DBI can do too. See its documentation for extra information. workout See Appendix A for the reply to the subsequent workout: 1. [15] set up the Module::CoreList module from CPAN. Print an inventory of all the mod- ules that got here with Perl five. 008. to construct a hash whose keys are the names of the modules that got here with a given model of Perl, use this line: my %modules = percent{ $Module::CoreList::version{5. 008} }; workout | 177 bankruptcy 12 dossier assessments past, we confirmed easy methods to open a filehandle for output.

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