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Thread use local storage temporary
Wed, Jan 15 2014 4:48 AMPermanent Link

Mike

Thank you for the help!

The dataset (dataset1) is put on a separate form (called datamodule), unit datamodule is added to main and child form.

On the main page is a grid which should be pointed to the dataset on the datamodule form.

Tried this but frmDatamodule.dataset1 is not allowed.

Shouldn't this work this way?
Wed, Jan 15 2014 6:07 AMPermanent Link

Matthew Jones

I would expect it to work, but what is the error?
I presume the unit is included. Is the datamodule dataset public?
Or perhaps it needs to be wired up at runtime if the IDE doesn't allow it to be
connected. I don't know about this aspect of EWB.

/Matthew Jones/
Wed, Jan 15 2014 12:27 PMPermanent Link

Tim Young [Elevate Software]

Elevate Software, Inc.

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Email timyoung@elevatesoft.com

Mike,

<< Is it not possible to save the fields to a dataset (defined at design
time) via

LocalStorage.Set(dsDocuments.DataSetName, dsDocuments.GetRows);

and load them via

dsDocuments.LoadRows(LocalStorage.Items[dsDocuments.DataSetName]); ? >>

Yes, it's possible.  That's exactly what the DataSetClient example
demonstrates:

procedure TDataSetForm.SaveDatabaseButtonClick(Sender: TObject);
begin
  LocalStorage.Set(Biolife.DataSetName,Biolife.GetRows);
  LocalStorage.Set('Transactions',Database.GetTransactions);
end;

procedure TDataSetForm.LoadDatabaseButtonClick(Sender: TObject);
begin
  if LocalStorage.Exists('Transactions') then
     Database.LoadTransactions(LocalStorage.Items['Transactions'])
  else
     ShowMessage('Transaction operations not found in local storage');
  UpdateButtons;
  if LocalStorage.Exists(Biolife.DataSetName) then
     Biolife.LoadRows(LocalStorage.Items[Biolife.DataSetName])
  else
     ShowMessage('Biolife dataset not found in local storage');
end;

What *specific* problems are you seeing when you try to do the above ?

Tim Young
Elevate Software
www.elevatesoft.com
Wed, Jan 15 2014 12:29 PMPermanent Link

Tim Young [Elevate Software]

Elevate Software, Inc.

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Email timyoung@elevatesoft.com

Mike,

<< Is it always necessary to connect to a database when using a dataset? >>

No, in fact the TDataSet never really knows where the JSON is coming from,
and has no knowledge of the back-end database(s).

<< When I use the following code: >>

Don't use the native HTML5 DOM objects, use the wrappers instead:

http://www.elevatesoft.com/manual?action=viewcomp&id=ewb1&comp=TPersistentStorage

Tim Young
Elevate Software
www.elevatesoft.com
Wed, Jan 15 2014 3:10 PMPermanent Link

Mike

@Matthew
I got it working. After removing the grid and adding a new grid it could connect to the dataset.

@Tim
Thanks for the hint. I will try this.
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