sdk\ctree.vcl.delphi\tutorials\Tutorial2.pas
Now we will build some table/file relationships using the FairCom DB CodeGear VCL ISAM Component Framework - Delphi.
This tutorial will advance the concepts introduced in the first tutorial by expanding the number of tables. We will define key columns/fields and create specific indexes for each table to form a relational model database.
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 #2: Relational Model and Indexing
Here we add a bit more complexity, introducing multiple tables, with related indices in order to form a simple "relational" database simulating an Order Entry system. Here is an overview of what will be created:
Note our simple logic:
procedure TForm1.FormShow(Sender: TObject);
begin
Initialize;
Define;
Manage;
end;
procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
CanClose := true;
Done;
end;
We suggest opening the source code with your own editor.
Continue now to review these four steps.