private void DoDistinct(FdoIConnection conn)
{
FdoISelectAggregates selectCmd = conn.CreateCommand((int)FdoCommandType.FdoCommandType_SelectAggregates) as FdoISelectAggregates;
Assert.NotNull(selectCmd);
selectCmd.SetFeatureClassName("World_Countries");
selectCmd.Distinct = true;
FdoIdentifierCollection propNames = selectCmd.GetPropertyNames();
FdoIdentifier ident = FdoIdentifier.Create("NAME");
propNames.Add(ident);
FdoIDataReader rdr = selectCmd.Execute();
HashSet <string> values = new HashSet <string>();
int count = 0;
while (rdr.ReadNext())
{
values.Add(rdr.GetString("NAME"));
count++;
}
rdr.Close();
Assert.Equal(values.Count, count);
}
private static void ValidateIdentifier(FdoIdentifier expr, ClassDefinition cls)
{
string name = expr.Name;
if (cls.FindProperty(name) == null)
{
throw new FdoExpressionValidationException(string.Format(Strings.InvalidExpressionPropertyNotFound, name), name);
}
}
protected abstract string TryTranslateIdentifier(FdoIdentifier ident, string featureVar);
protected override string TryTranslateIdentifier(FdoIdentifier ident, string featureVar)
=> $"({featureVar}.get('{ident.Name}'))";
protected override string TryTranslateIdentifier(FdoIdentifier ident, string featureVar)
=> $"({featureVar}.properties.{ident.Name})";
