Getting event parameter TDataSet *DataSet

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3 total messages Started by Sandi Wijaya Thu, 05 Apr 2001 13:12

#5520

Author: Sandi Wijaya
Date: Thu, 05 Apr 2001 13:12

35 lines
1760 bytes

Hello everyone !

I have problem like this :

void __fastcall TDatModMaintFinPeriods::QryFinPeriodBeforePost(
      TDataSet *DataSet)
{
  if (FrmMaintFinPeriods -> WriteMode == "Insert")
  {
    Finperiod_up(DataSet);
  }
  else
  {
    Finperiod_up(FrmMaintFinPeriods->old_record, DataSet);
  };
}

void __fastcall TDatModMaintFinPeriods::QryFinPeriodBeforeEdit(
      TDataSet *DataSet)
{
FrmMaintFinPeriods->old_record =  DataSet;

};

I want to save old record before editting record to variable old_record, How
should I do because old_record always have the same value with TDataSet
*DataSet, so I can not access the value before editting.

And I have another Question too,

TDataSet *temp = new TDataSet(NULL);

but it trigs a error that says "Cannot create instance of abstract class
'TDataSet'". Why it can be happens ? and if  I try to create variable from
class TQuery, it's working. Anyone could tell me ,please.

Re: Getting event parameter TDataSet *DataSet

#5524

Author: Alan Lichtenstein
Date: Thu, 05 Apr 2001 14:43

47 lines
2149 bytes

Why are you using TDataSet?  I believe TDataSet is an abstract class with
true virtual methods.
This means it should not be instantiated directly since these virutal
methods have not yet been implemented.
Try using TDBDataSet or TTable instead...


Sandi Wijaya wrote in message <3acc6f36_2@dnews>...
>Hello everyone !
>
>I have problem like this :
>
>void __fastcall TDatModMaintFinPeriods::QryFinPeriodBeforePost(
>      TDataSet *DataSet)
>{
>  if (FrmMaintFinPeriods -> WriteMode == "Insert")
>  {
>    Finperiod_up(DataSet);
>  }
>  else
>  {
>    Finperiod_up(FrmMaintFinPeriods->old_record, DataSet);
>  };
>}
>
>void __fastcall TDatModMaintFinPeriods::QryFinPeriodBeforeEdit(
>      TDataSet *DataSet)
>{
>FrmMaintFinPeriods->old_record =  DataSet;
>
>};
>
>I want to save old record before editting record to variable old_record,
How
>should I do because old_record always have the same value with TDataSet
>*DataSet, so I can not access the value before editting.
>
>And I have another Question too,
>
>TDataSet *temp = new TDataSet(NULL);
>
>but it trigs a error that says "Cannot create instance of abstract class
>'TDataSet'". Why it can be happens ? and if  I try to create variable from
>class TQuery, it's working. Anyone could tell me ,please.
>
>
>

Re: Getting event parameter TDataSet *DataSet

#5529

Author: Mark Cashman
Date: Fri, 06 Apr 2001 04:05

12 lines
1374 bytes

Are these questions about the ADOExpress components or the BDE
components? BDE questions are best asked in
borland.public.cppbuilder.database.desktop.

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