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Tuesday, August 23, 2016

Issuing Direct SQL from MVC5

Recently I needed to add a quick updater that added a value to Table1
when someone copied data from Table2.

Now, the normal way to do this with Entity Framework is to load the
Entity, and change the value, then save the changed entity.

But I am a SQL guy from way back, and rather than fetch the entire
record and write it all back through Entity Framework, I figured it
would be Way more efficient if I just sent the database an update
directly. Turns out that for us old SQL developers, it's terribly easy
to do just that.

Here is my example subroutine, for your dining pleasure.

        /// Updates a Toolkit with the number of the Assignment ID Created from it. If you are trying to remove an assignment id from a toolkit, use RemoveAssignmentFromToolkit()
        /// The toolkit ID to be updated
        /// The AssignmentID to attach
        public static void UpdateToolkitWithAssignmentID(int ToolkitID, int AssignmentID)
            using (ORM db = new ORM())
                        "UPDATE [dbo].[ToolkitRequests] SET[AssignmentID] = @AID Where[UniqueId] = @ID",
                        new SqlParameter("@AID", AssignmentID),
                        new SqlParameter("@ID", ToolkitID)

That's it! It's super fast, and there is no mucking about in Entity
Framework. NOTE that all the EF validity checking is skipped when you
do this, so use it in cases where it's a simple SQL and you can ensure
data integrity yourself. In my case, there is no way to get in this
routine without valid values in both params, so I know I won't get
surprised with a stray NULL.

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