sasha wrote:
> I have yet two questions:
>
> 1) DataModules. In delphi there is some kind of units, similar to forms,
> which i can use for placing non visual components such as connections,
> transactions, datasets and datasources. So i can place all my datasets
> inside this datamodule and use it where i need. It's very convenient.
> Than a few forms can use same datasource + dataset and all controls
> synchronize automatically by delphi.
>
> Imagine you have two forms: Goods and Sales.
> When you insert or edit sales you should select a good to sale, so Grid
> in table Goods and DropDownList in form Sales linked with same
> datasource/dataset which placed in datamodule.
> So grid on Goods form and DropDownList on sales form always show same
> records.
> Than if i open both forms Goods and Sales and change goods in goods form
> than this changes immediately shows in sales drop down list because of
> delphi synchronize it.
>
> What i can use in ADO.NET instead of that?
For example, binding to the same object created for this is your friend. :)
> 2) Datasets in delphi are clever. When i call DataSet.Open() than
> dataset fetch only records which need controls for display (or 1 record
> if no controls linked).
> For example i have form Goods with datagrid. In table Goods in database
> there are 1000 records, but on form Goods i can see only 100 records
> without scrolling. Then delphi fetches only first 100 records and it
> will fetch other 900 records only in case when i make client sorting or
> scrolling in grid or something else.
>
> How can i do the same in ADO.NET ?
>
Cause DS in ADO.NET is complete offline image of data, it's filled always
with all data from select.
But you can create/download layers with work i.e. with DataReader, which are
able to do this.
BTW: DataSet's TableAdapter is using DataReader internally so you can (I
hope) download also TableAdapters & DataSets with this functionality.
--
Jiri {x2} Cincura
http://blog.vyvojar.cz/jirka/ | http://www.ID3renamer.com
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