Question

I’m using .NET 3.5 SP1.

I have a stored procedure returning a result of a transaction as shown below:

---

Create PROCEDURE SetPrice
     @itemId int,
     @price int
AS
DECLARE @myERROR int -- Local @@ERROR
       , @myRowCount int -- Local @@ROWCOUNT
SET NOCOUNT ON
 BEGIN TRAN1 

 UPDATE item_price_table SET price=@price   WHERE itemid=@itemId 
 UPDATE order_table SET price=@price   WHERE itemid=@itemId 
 SELECT @myERROR = @@ERROR, @myRowCount = @@ROWCOUNT
 IF @myERROR != 0 GOTO HANDLE_ERROR  
 COMMIT TRAN1 -- No Errors, so go ahead
 RETURN 0
HANDLE_ERROR:
    ROLLBACK TRAN1
    RETURN @myERROR

---

I’m trying to get @@ERROR status code returned. In EF v1, I created FunctionImport ‘SetPrice’ and called it by creating method in ‘mycontext’ class as shown below:

---

public int SetPrice(int itemId, int price) {       
 Int32 result = -1;
 EntityCommand cmd = ((EntityConnection)this.Connection).CreateCommand();
 cmd.CommandType = System.Data.CommandType.StoredProcedure;
 cmd.CommandText = "myContext.SetPrice";
 cmd.Parameters.AddWithValue("itemId", itemId);
 cmd.Parameters.AddWithValue("price", price);
 EntityParameter retParameter = new EntityParameter(); 
 retParameter.Direction = System.Data.ParameterDirection.ReturnValue;
 cmd.Parameters.Add(retParameter);
 cmd.Connection.Open();
 cmd.ExecuteNonQuery();
 result = Convert.ToInt32(retParameter.Value);
 cmd.Connection.Close();
 return result;
} 

---

This resulted in following error:

The data reader returned by the store data provider does not have enough columns for the query requested. at System.Data.EntityClient.EntityCommandDefinition.ConstantColumnMapGenerator.System.Data.EntityClient.EntityCommandDefinition.IColumnMapGenerator.CreateColumnMap(DbDataReader reader) at System.Data.EntityClient.EntityCommandDefinition.Execute(EntityCommand entityCommand, CommandBehavior behavior) at System.Data.EntityClient.EntityCommand.ExecuteReader(CommandBehavior behavior) at System.Data.EntityClient.EntityCommand.ExecuteScalar[T_Result](Func`2 resultSelector) at System.Data.EntityClient.EntityCommand.ExecuteScalar()

Please tell how to resolve the issue.

Thank You.

Answer 1

EF v1 has a problem returning scalar values from a stored proc. This thread has more information.