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2010-03-26T21:47:40.623
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<p>If you have know your to be calculated fields names at runtime, you can use something like that. </p> <pre><code>var initing:boolean; procedure TSampleForm.dsSampleAfterOpen( DataSet: TDataSet); var i:integer; dmp:tfield; begin if not initing then try initing:=true; dataset.active:=false; dataset.FieldDefs.Update; for i:=0 to dataset.FieldDefs.Count-1 do begin dmp:=DataSet.FieldDefs.Items[i].FieldClass.Create(self); dmp.FieldName:=DataSet.FieldDefs.Items[i].DisplayName; dmp.DataSet:=dataset; if (dmp.fieldname='txtState') or (dmp.FieldName='txtOldState') then begin dmp.Calculated:=true; dmp.DisplayWidth:=255; dmp.size:=255; end; end; dataset.active:=true; finally initing:=false; end; end; procedure TSampleForm.dsSampleAfterClose( DataSet: TDataSet); var i:integer; dmp:TField; begin if not initing then begin for i:=DataSet.FieldCount-1 downto 0 do begin dmp:=pointer(DataSet.Fields.Fields[i]); DataSet.Fields.Fields[i].DataSet:=nil; freeandnil(dmp); end; DataSet.FieldDefs.Clear; end; end; procedure TSampleForm.dsSampleCalcFields( DataSet: TDataSet); var tmpdurum,tmpOldDurum:integer; begin if not initing then begin tmpDurum := dataset.FieldByName( 'state' ).AsInteger; tmpOldDurum:= dataset.FieldByName( 'oldstate' ).AsInteger; dataset.FieldByName( 'txtState' ).AsString := State2Text(tmpDurum); dataset.FieldByName( 'txtOldState' ).AsString := State2Text(tmpOldDurum); end; end; procedure TSampleForm.btnOpenClick(Sender: TObject); begin if dsSample.Active then dsSample.Close; dsSample.SQL.text:='select id,state,oldstate,"" as txtState,"" as txtOldState from states where active=1'; dsSample.Open; end; </code></pre>
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Querying!

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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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