Solved

How to check if record is locked

Posted on 1997-12-04
3
197 Views
Last Modified: 2010-04-04
How can you check to see whether a record that you are about to write to is locked by another user?  If I have to check for an exception, then which one should I check for (EConvertError, E....)?  What I want to do is rollback a Transaction if my write to a table fails.
0
Comment
Question by:tdiamond
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 2

Accepted Solution

by:
Waldek earned 100 total points
ID: 1352908
You must check for exception EDBEngineError and then
test ErrorCode like this
 case Errors[0].ErrorCode of
  DBIERR_LOCKED:{ Action , if lock failed}
  DBIERR_UNLOCKFAILED: { Action , if unlock failed}
 end;
0
 

Author Comment

by:tdiamond
ID: 1352909
What you gave me is a great start but it doesn't seem to compile (unless I'm doing something wrong). The following code works but will report an error when any kind of EDBEngineError occurs.  Can you tell me (or show me) how to modify it to test specifically for a locked record?  It would help me out a lot.

procedure TFRMMain.Button2Click(Sender: TObject);
begin
  try
    ItemsTable.edit;
    ItemsTable['Test']:=1;
  except on EDBEngineError do showmessage('Record is locked !');
  end;
end;
0
 
LVL 2

Expert Comment

by:Waldek
ID: 1352910
check function from unit BDE : DBIIsRecordLocked
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Come and listen to Percona CEO Peter Zaitsev discuss what’s new in Percona open source software, including Percona Server for MySQL (https://www.percona.com/software/mysql-database/percona-server) and MongoDB (https://www.percona.com/software/mongo-…
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question