protected override DbDataReader ExecuteDbDataReader(CommandBehavior behavior)
{
if (behavior != CommandBehavior.Default)
throw new NotSupportedException();
Notation notation = new Notation();
YYParser parser = new YYParser(notation);
object result = parser.yyparseSafe(new Tokenizer(_commandText));
QueryContext context = new QueryContext(DatabaseDictionary);
context.DatabaseDictionary.SearchPath = _searchPath;
Optimizer optimizer = new Optimizer(context);
optimizer.Process(notation);
QueryBinder binder = new QueryBinder();
binder.IsServerQuery = optimizer.IsServerQuery;
binder.Process(notation);
optimizer.PostProcess(notation);
if (BeforeExecute != null)
BeforeExecute(this, notation, optimizer, context);
Notation.Record[] recs = notation.Select(Descriptor.Root, 1);
Object[] raw_parameters = null;
if (recs.Length > 0)
{
Notation.Record[] recsd = notation.Select(recs[0].Arg0, Descriptor.Binding, 1);
if (recsd.Length > 0)
{
Symbol[] bindings = Lisp.ToArray<Symbol>(recsd[0].args[0]);
raw_parameters = new object[bindings.Length];
for (int k = 0; k < bindings.Length; k++)
{
recsd = notation.Select(bindings[k], Descriptor.Link, 1);
if (recsd.Length > 0)
{
DataEngine.Parameter p = (DataEngine.Parameter)recsd[0].Arg0;
raw_parameters[k] = _parameters[p.ParameterName].Value;
}
}
}
}
Translator translator = new Translator(context);
QueryNode rootNode = translator.Process(notation);
Resultset rs = rootNode.Get(context, raw_parameters);
optimizer.ProcessResults(rs);
return new DataReader(rs, context);
}