The reason that's useful, is because if I write a module for you to use - then all you need to know is how to run the internal code, and don't have to worry about what goes on inside.
The same can be said of any module whether it be object oriented or not e.g File::Find.

Some reasons that objects are useful:

Namespacing

Create an object and you have access to all it's functionality, no need to import various functions as you would with procedural code.

Polymorphism and Encapsulation

This is the ability to hide and swap out different implementations, exemplified by DBI (code copied from it's manual): 
$sth = $dbh->prepare(q{ SELECT region, sales FROM sales_by_region });
$sth->execute;
my ($region, $sales);
 
# Bind Perl variables to columns:
$rv = $sth->bind_columns(\$region, \$sales);
 
# you can also use Perl's \(...) syntax (see perlref docs):
#     $sth->bind_columns(\($region, $sales));
 
# Column binding is the most efficient way to fetch data
while ($sth->fetch) {
    print "$region: $sales\n";
}

[download]
You can write code like that whether your database is MySQL, PostgreSQL or any other supported by DBI. Each DBD::* driver module has methods implementing the familiar DBI interface whilst also encapsulating the details of how to communicate with a specific database.

In reply to Re: Object Oriented Perl - very basic guide by Arunbear
in thread Object Oriented Perl - very basic guide by Preceptor

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.