DELPHI-KYLIX

Briefcase Applications Explained

If you have remote users connecting to your database server who need to make changes to the data, you might want to set up a briefcase application, depending on what exactly they do with the data. This article will help you set one up using Delphi, MySQL, and an XML file.

Author Info:

By: Leidago

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October 10, 2006

TABLE OF CONTENTS:

So far we have covered how to retrieve data from the server, and how to store and make changes to that data. The final thing we need to do is apply those changes back to the server. We do this by simply calling the "applybatch()" function. So, double click on the button with the caption "Apply changes to Server" and add the following code:

procedure TForm2.btnapplyClick(Sender: TObject);
begin
// Connect to MySQL, load savedata.xml and send changes to
MySQL
form1.q.Connection := form1.ADOConnection1;
form1.q.UpdateBatch(arAll);
end;

This code connects to the server:

form1.q.Connection := form1.ADOConnection1;

Then calls the "UpdateBatch(arAll)" command:

form1.q.UpdateBatch(arAll);

Which updates the server with the changes.

Conclusion

There are some things that I have not covered in this article, such as conflict resolution. For example I did not address the question of how to detect if a record has been changed by someone else before you apply your updates. I've not experimented enough to work that out yet. Ultimately, you will have to decide what you want to do in those circumstances, but at the end of the day, the records will be overwritten one way or the other.

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