Datafaction = DaAbort still shows the error message?

[alogrep 0]

HI.

I have this scheme (pseudocode)

rery+0
repeat
  starttransaction;
  try
    table1.edit;.
    change table1;
    table1 post;
    commit;
  except
    on E: SysUtils.Exception  do begin
       Rollback;
       table1 cancel
       inc(retry);
      if retry>=3 then 
         showmessage & exit
      else
         sleep(500);
    end;
   end;
until retry>=3;
end;

In table1 OnPostError I have

begin
   ACTION:=DAaBORT;
end;

Why do I get the error message (regarding a conflict with other users)?

That defeats the purpose of the start transaction/commit/rollback setup.

DaAbort should NOT show the message, correct?

My intent is to retry the edit/post operation 3 times, but if a message shows up with

one user, by the time it reads it and closes it, other concurrent users get a timeout error.

 

[eivindbakkestuen 46]

On 9/2/2024 at 4:20 AM, alogrep said:

OnPostError

Notice the "Post" part? I'm guessing the error doesn't occur in .Post, but in .Edit.

[Remy Lebeau 1339]

Your rollback and cancel calls are backwards.  Since the transaction was started first, it should be rolled back last.  Cancel the edit before you rollback.  Consider using a 2nd try..except block to handle this correctly.  You are also not breaking the loop if the transaction is successful.

 

Try this instead:

retry := 0;
repeat
  starttransaction;
  try
    table1.edit;
    try
      change table1;
      table1.post;
    except
      table1.cancel;
      re-raise;
    end;
    commit;
    Break;
  except
    Rollback;
    inc(retry);
    if retry >= 3 then 
      showmessage & exit
    else
      sleep(500);
  end;
until False;