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How to Create a DB component with FIELD selector

Posted on 2001-09-16
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Last Modified: 2010-04-06
Hi, I want to create a DB component where I select the Datasource. That works correctly, but when I want to select the FIELD (TFIELD) I get a list of ALL fields. I only want to have the fields from the source I've selected in the object inspector.

Anyone knows How?
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Question by:Avataris
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TOndrej earned 100 total points
ID: 6485749
Have a look in DBReg unit...

RegisterPropertyEditor(TypeInfo(string), TComponent, 'DataField', TDataFieldProperty);

This means that TDataFieldProperty property editor is registered for all string properties called 'DataField' of all TComponent descendants.

I guess your component is a TComponent descendant <g>.
Is your property of type string?
Is it called 'DataField'?

IOW, does the declaration look similar to the following:

property DataField: string read GetDataField write SetDataField;

??

Please be more specific, and show us how the property is declared and any other info you think might be useful.
From the symptoms you describe it seems that your property is of type TField... but I don't want to guess for no good reason.

TOndrej
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Author Comment

by:Avataris
ID: 6485759
Yes the property is declared like that, I want to have a combobox with the fields from the table in the property editor.
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by:Avataris
ID: 6485762
I don't have a DBREG anything :(
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Expert Comment

by:TOndrej
ID: 6485763
Please show me the exact declaration and get/set methods and the internal field declaration.
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Author Comment

by:Avataris
ID: 6485767
But I think i get your point :)
I'll test it now.
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Expert Comment

by:TOndrej
ID: 6485772
I have it in <delphidir>\Source\Property Editors\dbreg.pas
(Delphi 5 Enterprise)
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Author Comment

by:Avataris
ID: 6485776
Thanx, this method :

RegisterPropertyEditor(TypeInfo(string), TComponent, 'DataField', TDataFieldProperty);


Is all I needed :)
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LVL 8

Expert Comment

by:TOndrej
ID: 6485779
It's strange that you needed it.

Anyway... You don't seem to be interested in a complete solution. Good luck.
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Author Comment

by:Avataris
ID: 6486011
Thanx, this method :

RegisterPropertyEditor(TypeInfo(string), TComponent, 'DataField', TDataFieldProperty);


Is all I needed :)
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Author Comment

by:Avataris
ID: 6486016
I don't have Delphi 5, just Delphi 4.
Delphi 4 has no examples about the subject.
Complete solutions take the fun of programming away ;)

But my component works fine now :)
Thanks!
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