private static void HandleDbConcurrencyException <T>(AutoReservationEntities context, T original) where T : class
{
var databaseValue = context.Entry(original).GetDatabaseValues();
context.Entry(original).CurrentValues.SetValues(databaseValue);
throw new LocalOptimisticConcurrencyException <T>($"Update {typeof (T).Name}: Concurrency-Fehler", original);
}
public void UpdateKunde(Kunde modified, Kunde original)
{
using (AutoReservationEntities context = new AutoReservationEntities())
{
try
{
context.Kunde.Attach(original);
context.Entry(original).CurrentValues.SetValues(modified);
context.SaveChanges();
}
catch (DbUpdateConcurrencyException e)
{
HandleDbConcurrencyException(context, original);
}
}
}
public virtual void UpdateReservation(Reservation original, Reservation modified)
{
using (var context = new AutoReservationEntities())
{
try
{
context.Reservationen.Attach(original);
context.Entry(original).CurrentValues.SetValues(modified);
context.SaveChanges();
}
catch (DbUpdateConcurrencyException)
{
HandleDbConcurrencyException(context, original);
}
}
}
//Kunde Update(Kunde modified, Kunde original)
public Kunde Update(Kunde modified, Kunde original)
{
using (var context = new AutoReservationEntities())
{
try
{
context.Kunden.Attach(original);
context.Entry(original).CurrentValues.SetValues(modified);
return(modified);
}
catch (DbUpdateConcurrencyException e)
{
HandleDbConcurrencyException <Kunde>(context, original);
return(null);
}
}
}
public Reservation UpdateReservation(Reservation modified, Reservation original)
{
using (var context = new AutoReservationEntities())
{
try {
context.Reservationen.Attach(original);
context.Entry(original).CurrentValues.SetValues(modified);
context.SaveChanges();
return(modified);
}
catch (DbUpdateConcurrencyException e)
{
HandleDbConcurrencyException <Reservation>(context, original);
return(null);
}
}
}
public Auto UpdateAuto(Auto modified, Auto original)
{
using (var context = new AutoReservationEntities())
{
try
{
context.Autos.Attach(original);
context.Entry(original).CurrentValues.SetValues(modified);
context.SaveChanges();
return(modified);
}
catch (DbUpdateConcurrencyException e)
{
HandleDbConcurrencyException <Auto>(context, original);
return(null);
}
}
}
public void UpdateAuto(Auto original, Auto modified)
{
context.Autos.Attach(original);
context.Entry(original).CurrentValues.SetValues(modified);
try
{
context.SaveChanges();
}
catch (DbUpdateConcurrencyException)
{
HandleDbConcurrencyException(context, original);
}
context.Entry(original).State = EntityState.Detached;
}
