my $stmt = 'INSERT INTO some_table (' . join(',', keys %data_to_insert) . ') VALUES (' . join(',', ('?') x keys %data_to_insert) . ')';
$dbh->do( $stmt, undef, values %data_to_insert); 

##</code><code>##

my $stmt = 'SELECT * FROM some_table WHERE entry_id = ?';
my $row = $dbh->selectrow_hashref($stmt, undef, $entry_id);

my $full_name = $row->{first_name'} . ' ' . $row->{last_name'};