TadSter
asked on
How do I update constraints in a dataset
Hello, here is a question that is bugging me. There has got to be a good solution for it, but I couldn't find it. I am using Vb.Net in Visual Studio 2005 accessing data from Sql Server 2005.
Here is what I did that caused a problem:
1. I created a database in Sql Server 2005 with constraints
2. I created a dataset in Visual Studio
3. In Sql Server I changed the field definition, deleted the constraint, changed the data, and created a new constraint that was incompatible with the old one.
4. Now I tried to fill the dataset in Visual Studio, but it produced an error: "Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints." It appears that the dataset has a copy of the old constraint.
My question is this: How can I update the dataset with the new constraint without deleting the dataset and starting over? It doesn't matter to me whether I do it manually somehow or do it via code; it only needs to be done once.
Thanks for your consideration
Here is what I did that caused a problem:
1. I created a database in Sql Server 2005 with constraints
2. I created a dataset in Visual Studio
3. In Sql Server I changed the field definition, deleted the constraint, changed the data, and created a new constraint that was incompatible with the old one.
4. Now I tried to fill the dataset in Visual Studio, but it produced an error: "Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints." It appears that the dataset has a copy of the old constraint.
My question is this: How can I update the dataset with the new constraint without deleting the dataset and starting over? It doesn't matter to me whether I do it manually somehow or do it via code; it only needs to be done once.
Thanks for your consideration
spprivate
Can you post your code please
ASKER
Most of this is done without code, but here is the line that generates the error:
Dim da As New W2_Process.PayrollW2DataTableAdapters.W2DataTableAdapter
da.Fill(dsAll.tbW2Data, Main.DataYear)
This blog should give you some insight (if you have not read it early)
ASKER
That is all good information, but doesn't address how to change constraints in a dataset.
I found this: http://msdn.microsoft.com/en-us/magazine/cc163877.aspx
It says: You can regenerate the class file by right-clicking in the XSD's designer view and selecting Generate DataSet
I couldn't find that in Visual Studio's designer view; anyway, I'm not sure if that would recreate constraints without recreating the dataset.
I found this: http://msdn.microsoft.com/en-us/magazine/cc163877.aspx
It says: You can regenerate the class file by right-clicking in the XSD's designer view and selecting Generate DataSet
I couldn't find that in Visual Studio's designer view; anyway, I'm not sure if that would recreate constraints without recreating the dataset.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
Great! I appreciate your help a lot. I did what you suggested with MSDataSetGenerator. It still did not work; It still threw the constraint exception.
I then checked the troubleshooting tips. I noted this one: "Clear datasets before loading them from view state. If there is data in the dataset when you load it, this exception may be thrown."
So I added Me.DataSet.Clear before the Fill statement and now it works fine. Whenever I disable the clear statement the exception returns. Apparently it clears the constraints as well. So I got my problem solved.
Grateful!
Thanks a lot!
I then checked the troubleshooting tips. I noted this one: "Clear datasets before loading them from view state. If there is data in the dataset when you load it, this exception may be thrown."
So I added Me.DataSet.Clear before the Fill statement and now it works fine. Whenever I disable the clear statement the exception returns. Apparently it clears the constraints as well. So I got my problem solved.
Grateful!
Thanks a lot!