I have two tables, let's just say Master and Details. The Master is the
parent table, Details the child table.
What I want is to create a row filter on the children. But I also want to
create a row filter on the master table such that only master records that
have children that meet the criteria in the children table filter, will be
included.
That is, only master records with one or more qualifying children.
Can this be done with row filters? I mean, I could go through the child
table to get a list of all the unique foreign keys and do an IN operation on
them. I'd rather not go this way on several grounds including, we could be
talking about thousands of records and then you could end up with a really
huge filter string which would be undesirable. I guess what I'm looking for
is something more automatic that won't have to be modified if the child data
set is modified. I suspect there's not a way to do SQL style relational
filters, but thought it was worth asking just in case.
Pete
18  2809 
"Cor Ligthert [MVP]" <no************ @planet.nl> wrote in message
news:O1******** *****@TK2MSFTNG P10.phx.gbl... Pete,
Reading your text I am in doubt if the select can help you.
http://msdn.microsoft.com/library/de...electtopic.asp
Otherwise I would go for the getchildrows and see if that is zero.
http://msdn.microsoft.com/library/de...drowstopic.asp
I hope this helps something
Cor
Thanks, but that's not going to do it. I guess what I neglected to mention
is this has to be done as a RowFilter since it's a DataViewManager which is
bound to a grid control. I want the grid to only show the parent rows for
parents that have children and the children which meet the row filter
criteria.
I know, this is probably some where in the land of obscurity. I mean, just
figuring out how to bind a grid to a DataViewManager and apply filters took
a bit of digging. MS didn't really go out of their way to document this
stuff.
Pete
If your tables/database is properly normalized (4th normal form) then
iterate through the associate table.. MasterDetail which you would have
built to resolve the many to many relationships between the tables.
Cheers
Denis
"Pete Davis" <pdavis68@[nospam]hotmail.com> wrote in message
news:o7******** ************@gi ganews.com... I have two tables, let's just say Master and Details. The Master is the
parent table, Details the child table.
What I want is to create a row filter on the children. But I also want to
create a row filter on the master table such that only master records that
have children that meet the criteria in the children table filter, will be
included.
That is, only master records with one or more qualifying children.
Can this be done with row filters? I mean, I could go through the child
table to get a list of all the unique foreign keys and do an IN operation
on them. I'd rather not go this way on several grounds including, we could be
talking about thousands of records and then you could end up with a really
huge filter string which would be undesirable. I guess what I'm looking
for is something more automatic that won't have to be modified if the child
data set is modified. I suspect there's not a way to do SQL style relational
filters, but thought it was worth asking just in case.
Pete
"Denis Dougall" <De***********@ moh.gov.on.ca> wrote in message
news:Oh******** ******@TK2MSFTN GP14.phx.gbl... If your tables/database is properly normalized (4th normal form) then
iterate through the associate table.. MasterDetail which you would have
built to resolve the many to many relationships between the tables.
Cheers
Denis
It's not many to many. It's one to many and there is no associate table.
I think you're misunderstandin g the question. The question is more in
regards to how to implement my requirements via a RowFilter.
Pete
Hi,
When filling the Master data, set your SQL to pull the data only if
they have the related child rows
i.e Select m.a,m.b,m.c from master m where m.a in (select distinct
child.a from child)
It might be in-efficient. But can definitely be looked at & query can
be optimized
Does it help ?
Kalpesh
> Hi,
When filling the Master data, set your SQL to pull the data only if
they have the related child rows
i.e Select m.a,m.b,m.c from master m where m.a in (select distinct
child.a from child)
It might be in-efficient. But can definitely be looked at & query can
be optimized
Does it help ?
Again, I need this to be done via RowFilters, not via the SQL. Basically,
here's how it works:
I have a DataViewManager bound to a grid control. The grid is hierarchical
and shows Master and Detail records. Above that, I have a Filter control
that lets the user select columns and values. When they set a value, I then
apply a RowFilter along the lines of:
dvm.DataViewSet tings[detailsDataTabl e].RowFilter = "Department ID = 4"
This will filter all detail records showing only those for DepartmentID = 4.
Now, I only want the Master records that have children that have
DepartmentID=4.
I don't want to have to reget the data from the data source as this wouldn't
be feasible from a performance standpoint.
Pete
Can you clone a table and populate the clone with the "matching" entries?
similiar to http://www.codeproject.com/csharp/Pr...DataGrids4.asp
5.5 Cloning?
"Pete Davis" <pdavis68@[nospam]hotmail.com> wrote in message
news:Is******** ************@gi ganews.com...
"Denis Dougall" <De***********@ moh.gov.on.ca> wrote in message
news:Oh******** ******@TK2MSFTN GP14.phx.gbl... If your tables/database is properly normalized (4th normal form) then
iterate through the associate table.. MasterDetail which you would have
built to resolve the many to many relationships between the tables.
Cheers
Denis
It's not many to many. It's one to many and there is no associate table.
I think you're misunderstandin g the question. The question is more in
regards to how to implement my requirements via a RowFilter.
Pete
> Can you clone a table and populate the clone with the "matching" entries? similiar to http://www.codeproject.com/csharp/Pr...DataGrids4.asp
5.5 Cloning?
No, this isn't feasible. I don't want to rebind the grid to a new datatable.
I don't want to create a new dataset. I need this to be done via the
RowFilter in the DataViewManager , if possible. If it's not possible then I
have plenty of other ways I can do it that are really not desirable. My
question is, can it be done with a RowFilter and if so, how?
Pete
Pete,
In my opinion can you not create this using a filter in SQL and as well will
you not be able to do that in a dataset. Because there is nothing to filter,
it is matching.
The same as in SQL you can use the getchildrows to make a seperate table.
I hope this helps,
Cor
"Pete Davis" <pdavis68@[nospam]hotmail.com> schreef in bericht
news:4N******** ************@gi ganews.com... "Cor Ligthert [MVP]" <no************ @planet.nl> wrote in message
news:O1******** *****@TK2MSFTNG P10.phx.gbl... Pete,
Reading your text I am in doubt if the select can help you.
http://msdn.microsoft.com/library/de...electtopic.asp
Otherwise I would go for the getchildrows and see if that is zero.
http://msdn.microsoft.com/library/de...drowstopic.asp
I hope this helps something
Cor
Thanks, but that's not going to do it. I guess what I neglected to mention
is this has to be done as a RowFilter since it's a DataViewManager which
is bound to a grid control. I want the grid to only show the parent rows
for parents that have children and the children which meet the row filter
criteria.
I know, this is probably some where in the land of obscurity. I mean, just
figuring out how to bind a grid to a DataViewManager and apply filters
took a bit of digging. MS didn't really go out of their way to document
this stuff.
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