Well done. Some corrections if I may.
(a) bind_columns SHOULD be after execute has been called.
As DBI's manual says, that's for maximum compatibility.
(b) You call bind_columns with four parameters (the first one been undef)
while your execute only returns three (id, name and phone).
While I have never used bind_columns before execute, I beleive that should fail.
My way is similar but not the same (I include just the different part):
my $sth = $dbh->prepare_cached(<<SQL);
select id, name, phone from people
where birth_month = ?
SQL
for my $month (@months) {
print "People born in $month:\n";
my($id, $name, $phone);
# Execute the statement for this $month
$sth->execute($month);
$sth->bind_columns(\$id, \$name, \$phone);
# Also valid: $sth->bind_columns(\($id, $name, $phone));
# Fetch each row and print out the values
while ($sth->fetch) {
print "\t", join("\t", $id, $name, $phone), "\n";
}
}
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