An error occurred while updating the entries. See the inner exception for details. - Linq to Entity

Question

been looking around and i just cant seem to figure out what is wrong.

Currently i'm trying to update my database with a new highscore when ever the player dies. But it keeps throwing that exception at me, no matter what i choose to try and save.

Code:

 HighScore hs = new HighScore();
            var id = from i in db.HighScores
                     orderby i.ID descending
                     select i;
            int newId = 0;

            if (id.Count() == 0)
            {
                newId = 1;
            }
            else
            {
                newId = id.First().ID + 1;
            }
        hs.ID = 6; //I just hardcoded in 6 to make sure i wasent because of the newId      //thing, and i have checked if theres already something on the sixths spot as well.
            hs.UserHighscore = 100;
            hs.HighscoreUsername = "test";
            hs.GameID = 1;
            db.HighScores.AddObject(hs);
            db.SaveChanges();

I've checked, again and again, and i just cant seem to figure out what the problem is.

Any help would be appriciated.

The exception:

System.Data.UpdateException was unhandled
  Message=An error occurred while updating the entries. See the inner exception for details.
  Source=System.Data.Entity
  StackTrace:
       at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
       at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
       at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
       at System.Data.Objects.ObjectContext.SaveChanges()
       at MatematikSpilMenu.SaveBunniesSceen.SaveHighscore() in MatematikSpilMenu\SaveBunniesSceen.cs:line 173
       at MatematikSpilMenu.SaveBunniesSceen.Update(GameTime gameTime, Boolean otherScreenIsActive, Boolean coveredByOtherScreens) in C:\Users\Etarnalazure-Alien\documents\visual studio 2010\Projects\MatematikSpilMenu\MatematikSpilMenu\MatematikSpilMenu\SaveBunniesSceen.cs:line 110
       at MatematikSpilMenu.ScreenManager.Update(GameTime gameTime) in MatematikSpilMenu\ScreenManager.cs:line 101
       at Microsoft.Xna.Framework.Game.Update(GameTime gameTime)
       at Microsoft.Xna.Framework.Game.Tick()
       at Microsoft.Xna.Framework.Game.HostIdle(Object sender, EventArgs e)
       at Microsoft.Xna.Framework.GameHost.OnIdle()
       at Microsoft.Xna.Framework.WindowsGameHost.RunOneFrame()
       at Microsoft.Xna.Framework.WindowsGameHost.ApplicationIdle(Object sender, EventArgs e)
       at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at Microsoft.Xna.Framework.WindowsGameHost.Run()
       at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
       at Microsoft.Xna.Framework.Game.Run()
       at MatematikSpilMenu.Program.Main() in MatematikSpilMenu\Game1.cs:line 120
  InnerException: System.Data.EntityCommandCompilationException
       Message=An error occurred while preparing the command definition. See the inner exception for details.
       Source=System.Data.Entity
       StackTrace:
            at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree)
            at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(UpdateTranslator translator, Dictionary`2 identifierValues)
            at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues)
            at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
       InnerException: System.NotSupportedException
            Message=Server-generated keys and server-generated values are not supported by SQL Server Compact.
            Source=System.Data.SqlServerCe.Entity
            StackTrace:
                 at System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateReturningSql(StringBuilder commandText, DbModificationCommandTree tree, ExpressionTranslator translator, DbExpression returning)
                 at System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateInsertSql(DbInsertCommandTree tree, List`1& parameters, Boolean isLocalProvider)
                 at System.Data.SqlServerCe.SqlGen.SqlGenerator.GenerateSql(DbCommandTree tree, List`1& parameters, CommandType& commandType, Boolean isLocalProvider)
                 at System.Data.SqlServerCe.SqlCeProviderServices.CreateCommand(DbProviderManifest providerManifest, DbCommandTree commandTree)
                 at System.Data.SqlServerCe.SqlCeProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree)
                 at System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree)
                 at System.Data.Common.DbProviderServices.CreateCommand(DbCommandTree commandTree)
                 at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree)
            InnerException: 

Answer 1

Well from my experience that is usually triggered by a db error, in my case it was a trigger associated with the table that was failing and throwing the root exception. In your case however it seems that you are mistakenly trying to define the id manually when using an auto-numbered (identity) field.

Answer 2

It seems to me that the root of the problems resides on the SQL server you use:

Server-generated keys and server-generated values are not supported by SQL Server Compact.

Are you trying to use an auto increment ID on SQL server Compact version? I'm not remember well, but maybe that is not possible with that SQL version. I suggest you to check that first.

Answer 3

Found the solution, it seems that its the database that can bug if in use too many places (This is just me guessing). Either way, creating a new table and then adding stuff to there seemed to fix it (Did not use Identity.)

Answer 4

In my case after switching on the table database the primary key to an auto_ink column the problem gone.