dba_exists Check whether key exists &reftitle.description; booldba_exists stringkey resourcehandle dba_exists checks whether the specified key exists in the database. &reftitle.parameters; key The key the check is performed for. handle The database handler, returned by dba_open or dba_popen. &reftitle.returnvalues; Returns &true; if the key exists, &false; otherwise. &reftitle.seealso; dba_delete dba_fetch dba_insert dba_replace