[fw-db] No adapter found error

I a doing something really simple:

Oracle table is sessiondata

class name Sessiondata.php
class Sessiondata extends Zend_Db_Table_Abstract
{
// table name matches class name
}

In my controller I have:
$t = new Sessiondata();

The error I get is:
Message: No adapter found for Sessiondata

And I am also having the hardest time with table names with underscores.
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