Question

VB 2008 EXPRESS & SqlServer Compact - Create a relation between tables

Asked by: ljcor

I have a table, EvalItems, which has a primary indexed key, ProjID.

I also have some other tables, Tbl1, Tbl2, Tbl3, etc. which also have the same primary indexed key, ProjID with the same data type, etc. as that in EvalItems.  I created these separately at different times so I did not relate them in any way.

Now I want to make EvalItems a parent table and the others Child tables.  None of the tables take or give or report information from one or the other.  However, I do want to be able to Delete all of the Child tables in a cascade when the parent, EvalItems is deleted.

Unfortunately I do not know how to make those relations now that they have been created.  Is there a way to do this without programming the relations, in other words by utilizing a tool rather than code?  If so, how do I get at the tool?  And use it?

The MSDN tutorial says, essentially, to use:: ...Relations property of the DataSet, and the ChildRelations and ParentRelations properties of the DataTable.   But I don't see how to get at those properties now.

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Asked On
2009-06-21 at 23:38:14ID24510334
Topic

Microsoft Visual Basic.Net

Participating Experts
1
Points
500
Comments
9

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Answers

 

by: emoreauPosted on 2009-06-22 at 04:08:05ID: 24681213

do you have the DataSource window in the Express edition?

 

by: ljcorPosted on 2009-06-22 at 04:12:30ID: 24681227

Yes.  It does display the EvalDataSet.xsd and its tables.

 

by: ljcorPosted on 2009-06-22 at 04:14:10ID: 24681235

You might also look at another associated .xsd problem I just posted about 2 minutes ago.

 

by: ljcorPosted on 2009-06-22 at 04:16:14ID: 24681246

The ID of that newer question is   ID: 24510760

 

by: emoreauPosted on 2009-06-22 at 04:36:14ID: 24681386

From the "Server Explorer", create a new Data Connections to your .sdf file. From there create a new database diagrams and draw relations between your tables.

 

by: ljcorPosted on 2009-06-22 at 04:41:51ID: 24681416

I do not have a Server Explorer since I am working on this on a Local basis.  If I use Database Explorer to Configure a new connection that will create a duplicate of the .xsd DataSet.  Is that what I should do?

 

by: emoreauPosted on 2009-06-22 at 05:04:27ID: 24681545

The Server Explorer is available even if you work locally. If you don't have it it may be a restriction of the Express edition.

 

by: ljcorPosted on 2009-06-22 at 17:07:36ID: 24687809

Until now I never had a reason to look up the Server Explorer.  The MS Library has this explation:

"In the Visual Studio Express products, this window is named Database Explorer. In all other Visual Studio products, this window is named Server Explorer. "

So apparently they are both the same but with different names.  It may also be that the Database Explorer has fewer features than does the Server Explorer.  I just don't know.

Still, I don't have a clue of how to create relations in spite of the modicum of help attempted above.  I only need to establish the relationships to cascade Deletions and I can do that with code if need be.

 

by: ljcorPosted on 2009-07-05 at 03:49:23ID: 31594954

I finally got back to this, hacked around, and think I figured it all out.  Not really very tough at all - if I'm right.  Thanks for your help and sorry for the delay.
Jack

20120131-EE-VQP-002

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