CODEWITHSUNDEEP
delphiruntimeparentdelphi-2009
Christine Ross
Christine Ross

Reputation: 463

dbctrlgrid delete and populate entries at runtime

I want to load the content of of dbctrlgrid at runtime (from database). So I encountered several challenges:

  1. How to detect if the dbctrlgrid is empty and/or how to clear it.
  2. How to put Tlabel and Tdbtext on the panel. The main problem seems to be to find the right parent. dbctrlgrid doesn't work. There is an object called Tdbctrlpanel which should work, but I don't know how to access it. I could not find it in properties or methods of Tdbctrlgrid.

Any code snipplet is welcome

Upvotes: 1

Views: 1761

Answers (2)

Uwe Raabe
Uwe Raabe

Reputation: 47704

To add controls to a TDBCtrlGrid you have to set the controls parent to the Panel property of the TDBCtrlGrid. The problem is that this property is protected. There are several ways to overcome this limitation. One is shown at Delphi About: Accessing protected members of a component
This is a common technique known to Delphi programmers as the 'protected hack'.

Upvotes: 0

Jan Doggen
Jan Doggen

Reputation: 9096

To answer 1)

You don't query the TDBCtrlGrid, you query the underlying dataset; if it .IsEmpty the grid is empty.

When people start using data aware (grid) components they have the tendency to see that as the 'data container' that you can query and modify, but that is not the case. See it as a view on your underlying data with some built-in editors that modify that data. Then the 'same rules' apply to you as to these editors: update the underlying dataset.

Upvotes: 1

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