/// <summary>Return a range of keys</summary>
/// <param name="query">Source database query</param>
/// <param name="range">Pair of key selectors</param>
/// <returns>Query that will return the keys from the specified <paramref name="range"/></returns>
public static IFdbAsyncSequenceQueryable <KeyValuePair <Slice, Slice> > Range(this IFdbDatabaseQueryable query, KeySelectorPair range)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
var expr = FdbQueryExpressions.Range(range);
return(query.Provider.CreateSequenceQuery(expr));
}
public void Test_FdbQueryRangeExpression()
{
var expr = FdbQueryExpressions.Range(
KeySelectorPair.Create(TuPack.ToKeyRange("Foo"))
);
Log(expr);
Assert.That(expr, Is.Not.Null);
Assert.That(expr.Range.Begin.Key.ToString(), Is.EqualTo("<02>Foo<00><00>"));
Assert.That(expr.Range.End.Key.ToString(), Is.EqualTo("<02>Foo<00><FF>"));
Assert.That(expr.Type, Is.EqualTo(typeof(IAsyncEnumerable <KeyValuePair <Slice, Slice> >)));
Assert.That(expr.ElementType, Is.EqualTo(typeof(KeyValuePair <Slice, Slice>)));
Log(FdbQueryExpressions.ExplainSequence(expr));
}
public void Test_FdbQueryRangeExpression()
{
var expr = FdbQueryExpressions.Range(
FdbTuple.Create("Foo").ToSelectorPair()
);
Console.WriteLine(expr);
Assert.That(expr, Is.Not.Null);
Assert.That(expr.Range.Begin.Key.ToString(), Is.EqualTo("<02>Foo<00>"));
Assert.That(expr.Range.End.Key.ToString(), Is.EqualTo("<02>Foo<01>"));
Assert.That(expr.Type, Is.EqualTo(typeof(IFdbAsyncEnumerable <KeyValuePair <Slice, Slice> >)));
Assert.That(expr.ElementType, Is.EqualTo(typeof(KeyValuePair <Slice, Slice>)));
Console.WriteLine(FdbQueryExpressions.ExplainSequence(expr));
}