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  1. or download this
    package External;
sub dbh { $External::dbh ||= DBI->connect( 'DBI:mysql:test','root','' 
+) } #dbh
  2. or download this
    package Foo;
sub new {
...
    bless {},__PACKAGE__.'::'.$driver;
}
sub general { same for all database drivers }
  3. or download this
    package Foo::mysql;
@ISA = qw(Foo);
sub specific { stuff specific to MySQL }
  4. or download this
    $dbh->{Driver}{Name};  # gives "mysql"
$dbh->get_info( 17 );  # gives "MySQL"