It has a DefiningQuery element but no InsertFunction... err

asp.net entity-framework

Question

This thing is driving me crazy, and the error is quite meaningless to me:

Unable to update the EntitySet 'TableB' because it has a DefiningQuery and no element exists in the element to support the current operation.

My tables are put like this:

TableA
int idA (identity, primary key)
...

TableB
int idA (FK for TableA.idA)
int val

TableB has no defined primary key in the SQL server. The Entity Framework has imported the table and the association and set both fields as key. But it will output that error when I try to do an insert into the table!

What's wrong??


Edit: As suggested by Alex, the solution was this:

  1. Right click on the edmx file, select Open with, XML editor
  2. Locate the entity in the edmx:StorageModels element
  3. Remove the DefiningQuery entirely
  4. Rename the store:Schema="dbo" to Schema="dbo" (otherwise, the code will generate an error saying the name is invalid)
  5. Remove the store:Name property

I left the key as it was, since it was OK to me that both the columns are part of the key.

1
123
10/20/2009 7:11:50 AM

Accepted Answer

Well when a table is encountered without a PrimaryKey it is treated as a View.

And views show up in the EDMX file (open in an XML editor to see) in the StorageModel\EntitySet[n]\DefiningQuery element.

When you have a DefiningQuery the Entity becomes readonly unless you add modification functions. You need 3 modifications functions (aka Stored Procedures) one for each of Insert, Update and Delete.

But you have two options:

Change the key definion:

  1. And convince the EF that what it thinks is a view is really a table
  2. Or add the appropriate modification functions

In your case I recommend (1).

141
1/17/2012 7:24:31 PM

Popular Answer

Just Add a primary key to the table. That's it. Problem solved.

ALTER TABLE <TABLE_NAME>
ADD CONSTRAINT <CONSTRAINT_NAME> PRIMARY KEY(<COLUMN_NAME>)


Related Questions





Related

Licensed under: CC-BY-SA with attribution
Not affiliated with Stack Overflow
Licensed under: CC-BY-SA with attribution
Not affiliated with Stack Overflow