MasterDataPipeline changed after Preview

rbuser

Hello,

i have three DataSources with Pipelines:
PipeA -> SourceA
PipeB -> SourceB
PipeC -> SourceC

SourceB has MasterSource SourceA and SourceC has also MasterSource SourceA.
PipeB has MasterDataPipeline PipeA and PipeC has MasterDataPipeline PipeB,
so different from the sources to achive a "visual" grouping.

After Startup of the Designer everything looks fine. PipeA has a subpipeline
PipeB, PipeB has a subpipeline PipeC.
After switching to Preview and Back, the Pipelines have a new order: PipeA
has two direkt subpipelines PipeB and PipeC, corresponding to their
Datasources.
So why does this behave differently? I thought, the
MasterDataPipeline-Property is only for visual purposes with DBSources? How
can I achive a different visual grouping for the Pipelines as for the
Datasources?

Kind regards,
Wolfgang Hanke

nicocizik

Hi Wolfgang,

I'm sorry but I'm a bit unclear about what you are trying to accomplish.

When creating a Master-Detail report, you have two options, you can
either use manual Delphi linking (using parameteres and the
MasterSource) or use Datapipeline linking using the MasterDataPipeline
property and the link dialog. You cannot use both.

See the following article on the subject as well as take a look at demos
61 and 64 which highlight the difference between the types of linking.

http://www.digital-metaphors.com/rbWiki/Data_Access/Fundamentals/Data_Traversal


Regards,

Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com

rbuser

Hi Nico,

were you able to reproduce the different behaviour after switching to
Preview and back?

I dont want to use the MasterDataPipeline for data traversal, but only for
visual purposes (which is pointed out in your source code: "Setting this
property causes the data pipeline to be represented within the Data Tree of
the Report Designer as nested within the data pipeline specified in master
data pipeline")

My DataSets are linked with MasterSource and Masterfields set and everything
works fine with data traversal. Only the visual appearance in the data tree
of the report designer is my problem. On startup it works,after preview its
broken (data traversal still works fine, its only a visual problem)

If its just "you cannot use both" i think i have to look for a different
solution, but my confusion began with the different behavior...

Wolfgang

nicocizik

Hi Wolfgang,

As I mentioned before, you can either use one method or the other to
link your datasets. If you link your datasets using pipeline linking,
you will enjoy faster reports and the relationships will be shown
visually in the Data Tree.

Is there a reason you do not want to use pipeline linking? The demos I
suggested you have a look at highlight the benefits of using this feature.