Is MySQL more resistant to SQL injection attack than PostgreSQL (under Perl/DBI)?

Question

I am reviewing a Linux based perl web application that contains a login handler with the ubiquitous

my $sth = $DB->prepare(\"SELECT password from passwords where use

Answer 1

The MySQL client library seems to limit to one statement per call by default (I encountered it with PHP).

But that's shouldn't be a reason to use MySQL over PostgreSQL, since you can still inject by using subqueries.