comment on

Don't forget about prepare_cached(). This can really help under mod_perl.

This code will do little more than suck up more memory:

for my $val(@values) {
    $val = $dbh->quote($val);
    my $sth = $dbh->prepare_cached(
       "UPDATE foo SET bar=7 WHERE baz=$val"
    );
    $sth->execute();
}
[download]

This code takes up a little more memory, but also avoids having to re-prepare what is really the same statement with different input:

for my $val(@values) {
    my $sth = $dbh->prepare_cached(
       "UPDATE foo SET bar=7 WHERE baz=?"
    );
    $sth->execute($val);
}
[download]

----
I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

: () { :|:& };:

Note: All code is untested, unless otherwise stated

In reply to Re: Use Placeholders. For SECURITY and (sometimes) for PERFORMANCE by hardburn
in thread Use Placeholders. For SECURITY and (sometimes) for PERFORMANCE by jZed

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