DBI: Is there an "unbind" method?

[BeemerBiker]

I added a temporary column to a database and want to delete it after I am finished with it. However, I cannot remove the column while it is still bound to a variable.

I tried $sth->finish() but that didnt do anything
$dbh->disconnect() works but I have to reconnect before I can remove the column. Google seems to indicate there is no unbind. The following code snippet works. Note: TestSource("NEW ") does a connect to the "new" database and assignes $dbh.

   TestSource("NEW");
   $sth = training::RunSql($dbh, "SELECT [Employee ID],TempDept, TempPrivilege FROM EmployeeInfo;");
   $sth->bind_columns(\$eid, \$dept, \$priv);
   while($sth->fetch())
   {
    ...blah blah blah...
   }
   $dbh->disconnect();
   TestSource("NEW");
   training::RunSql($dbh,"ALTER TABLE EmployeeInfo DROP COLUMN TempDept;");
   training::RunSql($dbh,"ALTER TABLE EmployeeInfo DROP COLUMN TempPrivilege;");

[KevinADC]

The place to look is in the DBI modules documentation. Personally I don't know if there is or isn't.