Question

I’m trying to do the following transaction using Linq to sql.

but the id Field is not retrieved so an exception occurs

The INSERT statement conflicted with the FOREIGN KEY constraint

so what to do?

my code:

System.Data.Common.DbTransaction transaction = null;
            DBDataContext db = new DBDataContext();
            db.Connection.Open();
            transaction = db.Connection.BeginTransaction();
            db.Transaction = transaction;

            Table1 = new Table1();
            obj.objName = "some name";
            db.Table1s.InsertOnSubmit(obj);

            Table2 obj_info = new Table2();
            obj_info.Info = "some info";
            obj_info.Id = obj.Id;
            db.Table2s.InsertOnSubmit(obj_info);
            try
            {
                db.SubmitChanges();
                transaction.Commit();
            }
            catch (Exception)
            {
                transaction.Rollback();
            }
            finally
            {
                transaction.Dispose();
                db.Dispose();
            }

Edit:maybe i the code wasn’t clear enough
the obj variable has the primary key Id so obj.Id is the auto-generated identity
and i need to insert it into obj_info.Id which is foreign key

Answer 1

it seems like i need to use SubmitChanges after evert insert

        System.Data.Common.DbTransaction transaction = null;
        DBDataContext db = new DBDataContext();
        db.Connection.Open();
        transaction = db.Connection.BeginTransaction();
        db.Transaction = transaction;

        Table1 = new Table1();
        obj.objName = "some name";
        db.Table1s.InsertOnSubmit(obj);
        db.SubmitChanges();

        Table2 obj_info = new Table2();
        obj_info.Info = "some info";
        obj_info.Id = obj.Id;
        db.Table2s.InsertOnSubmit(obj_info);
        db.SubmitChanges();
        try
        {
            db.SubmitChanges();
            transaction.Commit();
        }
        catch (Exception)
        {
            transaction.Rollback();
        }
        finally
        {
            transaction.Dispose();
            db.Dispose();
        }

I’m not totally sure about this but it worked

if any one can confirm it please tell me