my $ret = $src_drinks->match( { sugar => "no",
                                color => "black" } );

##</code><code>##

SELELCT * FROM drinks WHERE sugar LIKE "no" AND color LIKE "black"; 

##</code><code>##

# sub match
# return all objects that match the requested options
sub match{
  
  my ( $self, $hashref ) = @_; 
  
  my @keys =  keys %{ $hashref };
  
  if ( ( @keys == 1 ) && defined( $self->{ _matched }->{ $keys[0]."@".$hashref->{ $keys[0] } } ) ) {
    return  $self->{ _matched }->{ $keys[0]."@".$hashref->{ $keys[0] } };
  }
  
  # STEP 2: now go through all objects and return ptr to list of matched objects or 0, if none found.
  my @ret;
  
  foreach my $obj ( @{ $self->get_data() } ) {
    
    my $equals = 1;
    
    foreach my $key ( @keys ){
      my $s = "\$obj->get_".$key."()";
      $equals = 0 unless ( $hashref->{ $key } eq eval( $s ) );
    }
    
    push ( @ret, $obj ) if ( $equals == 1 );
  }
  
  if ( @ret == 0 ){ 
    return 0; 
  }
  
  $self->{ _matched }->{ $keys[0]."@".$hashref->{ $keys[0] } } = \@ret if ( @keys == 1 );
  return \@ret;
}