dba_exists Check whether key exists booldba_exists stringkey resourcehandle dba_exists checks whether the specified key exists in the database specified by handle. Key is the key the check is performed for. Handle is a database handle returned by dba_open. dba_exists returns &true; or &false;, if the key is found or not found, respectively. See also: dba_fetch, dba_delete, dba_insert, and dba_replace.