I have set up a rather simple "singleton" type class to share a single database connection among several objects (about 20 in all) in a large application. The code I used follows the examples in Damian Conway's excellent book about OO Perl. 

pacakge MyProject::DBH;

use DBI;

my $DBH;    # lexical scope outside the constructor
            # makes it available to all calls to new().

sub get_dbh { 
    if ref($DBH) eq 'DBI::db') { 
        # dbh already created, so return it
        return $DBH;
    } else { 
        # connect to the DB and return the handle
        # (assume $user, $pass and $dsn come from somewhere)
        $DBH = DBI->connect($dsn, $user, $pass);
        return $DBH;
    }
}

[download]

Then, it's just a simple matter of every object calling MyProject::DBH->get_dbh; to get the same database handle.

In reply to Re: Problem managing persistent database connections in modules by mfriedman
in thread Problem managing persistent database connections in modules by mp

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