If youre using this driver then your version of Sybase or the libraries you
use to connect to it do not support placeholders.
You can also enable this driver explicitly using:
my $schema = SchemaClass->clone;
$schema->connect($dsn, $user, $pass, \%opts);
See the discussion in
Using ? Placeholders & bind parameters to $sth->execute in DBD::Sybase
for details on the pros and cons of using placeholders with this particular
One advantage of not using placeholders is that select @@identity will work
for obtaining the last insert id of an IDENTITY column, instead of having to
do select max(col) in a transaction as the base Sybase driver does.
When using this driver, bind variables will be interpolated (properly quoted of
course) into the SQL query itself, without using placeholders.
The caching of prepared statements is also explicitly disabled, as the
interpolation renders it useless.