dbExpress Driver (dBX)

Transaction Processing

sdk\sql.dbx\Tutorial4\Unit1.pas

Now we will discuss transaction processing as it relates to the FairCom DB SQL DBX Component - Delphi.

Transaction processing provides a safe method by which multiple database operations spread across separate tables/files are guaranteed to be atomic. By atomic, we mean that, within a transaction, either all of the operations succeed or none of the operations succeed. This "either all or none" atomicity ensures that the integrity of the data in related tables/files is secure.

Like all other examples in the c-tree tutorial series, this tutorial simplifies the creation and use of a database into four simple steps: Initialize(), Define(), Manage(), and You’re Done()!

Tutorial #4: Transaction Processing

Here we demonstrate transaction control.

Initialize() - Connects to the FairCom Database Engine.
Define() - Defines and creates our four tables/files.
Manage() - Adds rows/records to multiple tables/files under transaction control.
Done() - Disconnects from FairCom Database Engine.

Note our simple mainline:

procedure TForm1.FormShow(Sender: TObject);

begin

Initialize;

Define;

Manage;

end;

procedure TForm1.BtnCloseClick(Sender: TObject);

begin

Done;

Close;

end;