Subreport Problem

rbuser

Hi I am having a real problem.

I have a subreport that does not print unless I select the record. If I do
not disable the controls I get and error when I try to print all the records
which is Invalid Parameter and report generation stops.
When I disable the controls then the subreport does not print the data and
the report is not correct.

Thanks In Advance
Jefferson Chase

nardmoseley

Use separate datasets for the report. Do not share datasets between the
visual controls on your form and the report.

Each time a subreport generates it will traverse all of the records in the
datapipeline to which it is assigned. You can define a master/detail
relationship for the data using one of two data linking options supported by
ReportBuilder. See article below...


------------------------------------------------------
Tech Tip: Linking SQL Queries for Master/Detail Data
------------------------------------------------------

The following example shows two options for linking SQL queries to create a
master/detail relationship.

In this example, we are using Delphi's DBDemos data to create a
Customer/Order relationship. Thus we wish to link the Orders detail to the
Customer master.

I. Delphi Query Linking
------------------------

a. Set the detail TQuery.DataSource property to point to the master
query's TDataSource component.

b. In the SQL "Where" clause for the detail query use a ':' followed by
the linking field name from the master:

example
select *
from orders
where orders.CustNo = :CustNo

Now each time the master record position changes, the detail query will
automatically be refreshed with the correct result set.


II. RB DataPipeline Linking
-----------------------------

a. Set the detail DataPipeline.MasterDataPipeline to point to the master
DataPipeline.

b. Use the detail DataPipeline.MasterFieldLinks property to define the
linking relationship

c. In the SQL for the detail, retrieve all records and sort them by the
linking master field:

select *
from Orders
order by CustNo


Notes:

1. Using RB DataPipeline, each query is executed only a single time - thus
performance is much faster.

2. RB Professional and Enterprise Editions include a visual Data environment
for creating SQL queries, defining linking relationships, and creating
Ask-At-Runtime parameters. Using the RB tools you could create the above
linked queries in about 10 seconds.


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--
Nard Moseley
Digital Metaphors
http://www.digital-metaphors.com