Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Calculated fields

Posted on 1998-05-06
4
Medium Priority
?
474 Views
Last Modified: 2010-04-06
I need to know how to create a calculated field that uses a second calculated field that
is contained in a dbgrid.  What I'm looking for basically is for a sum of a grid column
which is itself a calculated field.
0
Comment
Question by:AllenD
[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
  • 2
4 Comments
 
LVL 8

Accepted Solution

by:
ZifNab earned 50 total points
ID: 1342529
Hi AllenD,

What's the problem? Or am I missing something?

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  DBTables, DB, Grids, DBGrids;

type
  TForm1 = class(TForm)
    Table1: TTable;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    Table1SpeciesNo: TFloatField;
    Table1Category: TStringField;
    Table1Common_Name: TStringField;
    Table1SpeciesName: TStringField;
    Table1Lengthcm: TFloatField;
    Table1Length_In: TFloatField;
    Table1Notes: TMemoField;
    Table1Graphic: TGraphicField;
    Table1Calculate1: TFloatField;
    Table1Calculate2: TFloatField;
    procedure Table1CalcFields(DataSet: TDataSet);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Table1CalcFields(DataSet: TDataSet);
begin
 with Table1 do begin
  FieldByName('Calculate1').AsVariant := 25;
  FieldByName('Calculate2').AsVariant := FieldByName('Calculate1').AsFloat * 2;
  end;
end;

end.

Regards, ZiF.
0
 

Author Comment

by:AllenD
ID: 1342530
Hi Zif!

The problem I'm having is the second calculated field that operates on the first one is in a different table.  What I'm trying to do is make a running grand total of a line total.  ( I know it's kind of confusing)....to give you a general idea...here's a layout of what I want.

Quantity | Part Number | Price | Line total
3           | 1000             | 5.00  | 15.00                  <= in a dbgrid  Table1
3           | 2000             | 10.00| 30.00


                                     Parts Total        45.00      <= outside the grid. Table2


I hope this gives you a better idea of what I want.
Thanks

Al.
0
 

Author Comment

by:AllenD
ID: 1342531
Not QUITE what I was Looking for...but it gave me the ideas to be able to fix my code...thanks
0
 
LVL 8

Expert Comment

by:ZifNab
ID: 1342532
Seems to me you solved it already ....
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
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…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
In response to a need for security and privacy, and to continue fostering an environment members can turn to for support, solutions, and education, Experts Exchange has created anonymous question capabilities. This new feature is available to our Pr…
Suggested Courses

610 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