how to delete my self connection in firebird before close application?

Question

I want view all conncetions inside in the table "MON$ATTACHMENTS", but can´t delete a especific record. When delete return error : "Operation not supported".

  DELETE FROM mon$attachments
   WHERE mon$attachment_id IN (
                               SELECT mon$attachment_id
                                 FROM mon$attachments
                                WHERE  mon$attachment_id = current_connection
                              )

Result is : "Operation not supported"

Answer 1

This is not supported in Firebird 2.1, terminating connections by deleting from MON$ATTACHMENTS was added in Firebird 2.5 (_{The title says 2.1, but these are the 2.5 releasenotes}). It requires that the database is ODS 11.2 (the database format version of Firebird 2.5).

The query you use is convoluted (why not just DELETE FROM mon$attachments WHERE mon$attachment_id = current_connection), but it also makes no sense: If you want to kill your current connection, then just close the connection (note: I don't know Delphi, but I assume there is way to close a connection)! It is easier, faster and better.