public static IObservable <List <T> > mapToList <T>(this SQLiteCursor cursor, Func <SQLiteCursor, T> mapper)
{
return(Observable.Create((IObserver <List <T> > x) =>
{
List <T> items = new List <T>();
try
{
while (cursor.MoveNext())
{
items.Add(mapper(cursor));
}
x.OnNext(items);
}
catch (Exception e)
{
x.OnError(e);
}
finally
{
cursor.Dispose();
x.OnCompleted();
}
return Disposable.Create(() => Trace.WriteLine($"Query Completed...Record Count {items.Count}"));
}));
}
public static IObservable <T> asRow <T>(this SQLiteCursor cursor, Func <SQLiteCursor, T> mapper)
{
return(Observable.Create <T>((IObserver <T> x) =>
{
int affectedRecord = 0;
if (cursor != null)
{
try
{
while (cursor.MoveNext())
{
x.OnNext(mapper(cursor));
affectedRecord++;
}
}
catch (Exception e)
{
x.OnError(e);
}
finally
{
cursor.Dispose();
x.OnCompleted();
}
}
return Disposable.Create(() => Trace.WriteLine($"Query Completed...Record Count {affectedRecord}"));
}));
}
public static IObservable <T> mapToOne <T>(this SQLiteCursor cursor, Func <SQLiteCursor, T> mapper)
{
return(Observable.Create((IObserver <T> x) =>
{
if (cursor != null)
{
if (cursor.MoveNext())
{
x.OnNext(mapper(cursor));
if (cursor.MoveNext())
{
x.OnError(new InvalidOperationException("Cursor returned more than 1 row"));
}
cursor.Dispose();
x.OnCompleted();
}
}
return Disposable.Create(() => Trace.WriteLine("Query Completed"));
}));
}
