#!/usr/bin/perl

# Modules used
use strict;
use warnings;
use DBI;

# Database Definition
our $dbh = &DB_OPEN('db_name','localhost','3306','db_user','db_password');
sub DB_OPEN
{
  my ($db_name,$host_name,$port,$db_user,$db_pass,) = @_;
  my $database = "DBI:mysql:$db_name:$host_name:$port";
  my $dbh = DBI->connect($database,$db_user,$db_pass);
}

# Retreive Database data
sub DB_GET
{
  my ($table,$refkey,$refval) = @_;
  my (%db_data,$sth);
  my $select = "select ";
  $sth = $dbh->prepare("desc " . $table);
  $sth->execute;
  while ( my ( $NAME, $TYPE, $NULL, $KEY, $DEFAULT, $EXTRA ) = $sth->fetchrow ) {
    $select .= "'$NAME',$NAME,";
  } # end-while
  $sth->finish;
  chop($select);
  $select .= " from $table";
  if ($refval) { $select .= " where $refkey=?"; }
  $sth = $dbh->prepare( $select );
  if ($refval) { $sth->execute($refval); }
  else { $sth->execute(); }
  while ( my ( @array ) = $sth->fetchrow_array ) {
    my %tmp_hash;
    my $ref = $array[1];
    for (my$i=0;$i<scalar(@array);$i+=2) {
      if ($array[$i] eq "$refkey") { $ref = "$array[$i+1]" }
      $tmp_hash{$array[$i]} = $array[$i+1];
    } # end-for
    $db_data{$ref} = { %tmp_hash };
  } # end-while
  $sth->finish;
  %db_data;
}

##</code><code>##

my %db_data = &DB_GET('clients', 'client_id', $client_id);