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Drill down reports using one dataset

edited September 2004 in General

I am trying to convert a drill down report that uses two datasets and a
sub report to use only one dataset (joined query). Is this possible?

Thanks,

J. Michael Eubanks

Comments

  • edited September 2004
    Hi Michael,

    A drill down report requires a master detail relationship between two
    separate datasets in order to function correctly. In a master detail
    report, the subreport will use the linking key field to determine where to
    break to the next record in the master dataset. This cannot be done with
    one dataset in ReportBuilder. Please see the article below for more
    information on how data traversal works in ReportBuilder.

    ------------------------------------------------
    TECH TIP: Fundamentals of Report Data Traversal
    ------------------------------------------------


    1. Single Table Listing Report

    Assign the Report.DataPipeline property and leave the
    DetailBand.Pipeline unassigned.

    The report will traverse the data from start to end (based on the
    datapipeline range settings and honoring any filters you've placed on
    the datset etc.)


    2. Master/Detail Report:

    A. Assign the Report.DataPipeline property to the master. Create a
    subreport in the detail band and assign the childreport.DataPipeline to
    the detail datapipeline.

    Use either the visual linking features available from the Report
    Designer's Data tab, or Use standard Delphi dataset linking to define
    the relationships between the datasets.

    The Report will traverse the master records and for each, the subreport
    will traverse the detail data related to the master.


    3. Master with 2 Details

    Configure as in 2 above. Add an additional subreport to the detailband.
    Set subreport.ShiftRelativeTo property to the point to the first
    subreport. Connect the ChildReport's DataPipeline to the detail data.


    4. Report connected to no datapipelines.

    When Report.AutoStop is set to True, the Report will print a single
    detail band.

    When Report.AutoStop is set to False, the Report will print detail bands
    until instructed
    to stop. You can control when the report stops by setting the
    Report.PageLimit property or by calling Report.DataTraversalCompleted
    method. Otherwise the report will never stop.


    Additional Notes:
    ----------------

    1. SubReports have a Report property that is of type TppChildReport.
    Thus, programmatically you can code SubReport.Report.DataPipeline :=
    myDataPipeline.

    2. ChildReport's traverse data following the same rules as above. A
    ChildReport prints in its entirety each time it gets a turn to print.

    3. For a Child style SubReport use the Title/Summary band rather than
    the Header/Footer (or use a GroupHeader/GroupFooter combo). A standard
    Header/Footer will not work because these always print at the very
    top/bottom of the page.

    4. Do not filter the dataset of modify it any way once the report.Print
    command is issued. If you need to do master/detail and cannot use
    linked datasets, then use the master DataPipeline.OnRecordPositionChange
    event to filter the detail dataset.

    5. The reports and datapipelines use dataset bookmarking. Make sure
    the dataset can support bi-directional navigation.



    Check out the RBuilder\Demos\Reports\Demo.dpr project. Reports 0071,
    0072, 0073 show examples of master w/mutliple detail style reports.
    Number 0072 has two detail reports.

    --
    Best Regards,

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