问题
It has been a long time since I have worked with MS Access and am not sure if I am doing this right.
I have a Report bound to a query of single list of user names. The report groups on the user name and has a sub-report in the detail that is a chart.
The sub-report/chart is based on a query that accepts a parameter of the user name. Since the sub report is not bound I need to pass the user name parameter from the main report detail onload event down to the sub-report and thus into the underlying query.
I am not understanding how to make that happen or even if my approach is sound.
(p.s. i originally posted on "Super User" but see not many people use that site.)
Thanks for the help
回答1:
To get the full benefit of subreports they should be bound to a recordsource (table or query) and use the Link Master Fields and Link Child Fields properties of the Subform/Subreport control to "sync" the subreport data with the parent record.
Say you have a [Users] table
userID
------
Gord
Tim
and a [UserTraffic] table
userID trafficDate downloadMB
------ ----------- ----------
Gord 2013-04-26 366
Gord 2013-04-25 442
Tim 2013-04-26 890
Tim 2013-04-25 212
Your main report [UserReport] is bound to [Users] and contains a subreport control based on the report [UserTraffic_subreport]
When you use that report in your Subform/Subreport control on your main form...
...be sure to set the Link Master Fields and Link Child Fields properties...
...so your report will come out like this:
Note that this example required no VBA code at all.
Edit
The same principles apply when adding a chart to a report. The following report displays user traffic by date, so the Record Source for the main report is
SELECT DISTINCT trafficDate FROM UserTraffic ORDER BY trafficDate;
The report uses a Chart control instead of the Subform/Subreport control...
...and the properties of the Chart control are...
The resulting report looks like this
来源：https://stackoverflow.com/questions/16242899/passing-query-parameter-to-sub-report