Dear monks,

In a program I've got two subroutines, one of these initializes a reference to a DB connection, the other wants to use this reference through a parameter hash.

I thought someting like this would work: 
 my %parameterhash;
 my $hashref = \%parameterhash;
 a($hashref);
 b($hashref);
sub a{
 my $hash_ref = @_;
 my $dbconnection= makeDBconnection();
 my $handle = \$dbconnection;
 connect($handle);
 $hash_ref->{dbhandle} = $handle;
}

sub b{
 my $hash_ref = @_;
 my $hand = $hash_ref->{dbhandle};
 connect($hand);
}

[download]
The first connect works fine, the second fails with error message:
Use of uninitialized value in connect at line ##

I started playing with (de)referencing but I don't find what's wrong. Any help would be appreciated

In reply to passing (hash)refs through subroutines by jevaly

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.