fetching the primary key of a table

[jagdish eashwar]

Hi,
When I use the following syntax with Oracle, I am able to retrieve the
primary key. But the same syntax doesn't seem to work with MySql.

@primary_key = $dbh->primary_key($catalog,$schema,$table);

With my Oracle database, this translates to:
@primary_key = $dbh->primary_key(undef,'JAGDATA_TRANSFER','ORIG');

With my MySql database, this translates to:
@primary_key = $dbh->primary_key(undef,'jagdata_transfer','orig');

What am I doing wrong?