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How to link two datapipeline as master/detail relationship?

edited September 2002 in Datapipelines
and How to Set the MasterFieldlinks property

at run time?

thank you .

Comments

  • edited September 2002
    Are you using master field links to perform master detail linking as it is
    done in DADE by using a single query for all detail records, instead of
    letting Delphi fire a detail query every time the master record changes?
    Here is a demo of this approach:

    http://www.digital-metaphors.com/tips/MagicMasterDetail.zip

    ---------------------------------------------------------
    Tech Tip: Define Master/Detail DataPipeline Links in Code
    ---------------------------------------------------------

    Defining a Master/Detail relationship for a DataPipeline
    requires that the detail pipeline have the
    following properties defined:

    1. MasterDataPipeline

    2. MasterFieldLinks


    At Delphi design-time you can use the object inspector
    and the DataPipeline's FieldLinks editor to define
    the master/detail relationship.


    The following example illustrates how to define the
    master/detail relationship dynamically at run-time.


    var
    lFieldLink: TppMasterFieldLink;


    begin

    {define the master/detail pipeline relationship}
    plDetail.MasterDataPipeline := plMaster;

    {create a new field link }
    lFieldLink := TppMasterFieldLink.Create(nil);

    lFieldLink.Parent := plDetail;

    {assign the detail field name}
    lFieldLink.DetailFieldName := 'CustNo';

    {assign the master field name}
    lFieldLink.MasterFieldName := 'CustNo';


    end;


    Note: The DataPipeline linking requires the records in the detail dataset to
    be ordered by the linking fields. In the above example, the detail data must
    be ordered by CustNo.


    --
    Tech Support mailto:support@digital-metaphors.com
    Digital Metaphors http://www.digital-metaphors.com



    Cheers,

    Jim Bennett
    Digital Metaphors

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