public void Guid_Arg() { // Oracle has no Guid parameter support, Massive maps Guid to string in Oracle var db = new MightyOrm(string.Format(TestConstants.ReadWriteTestConnection, ProviderName)); var guid = Guid.NewGuid(); var inParams = new { inval = guid }; var outParams = new { val = new Guid() }; dynamic item; using (var command = db.CreateCommandWithParams("begin :val := :inval; end;", inParams: inParams, outParams: outParams)) { Assert.AreEqual(DbType.String, command.Parameters[0].DbType); db.Execute(command); item = db.ResultsAsExpando(command); } Assert.AreEqual(typeof(string), item.val.GetType()); Assert.AreEqual(guid, new Guid(item.val)); }