Feature 'nested external environment calls' not implemented

Question

Hi.
I've created a .Net 3.5 DLL which is called by a stored procedure using CLR in a trigger.
Inside one of the functions I've got an update-statement against the same table as the trigger which calls the CLR code.
That update results in a SAExeption:
30.04.2014 14:19:55 (ConnID. 89) - W747lnr=4000996, Error: Feature 'nested external environment calls' not implemented
iAnywhere.Data.SQLAnywhere.SAException: Feature 'nested external environment calls' not implemented
   at iAnywhere.Data.SQLAnywhere.SACommand.ExecuteReader()
   at CLRKalkyle.Exts.Execute(SAConnection conn, String sql, Object[] args)
   at CLRKalkyle.CalculusFunctions.DivInnfrakt(SAConnection conn, Pallet palle, Decimal totkvant)
   at CLRKalkyle.CalculusFunctions.GetInnfrakt(SAConnection conn, Int32 klientnr, String uttakstype, Int32 uttaksnr, Int32 w722lnr)
   at CLRKalkyle.Exts.DivKalkyle(SAConnection conn, Int32 klientnr, String uttakstype, Int32 uttaksnr, Int32 w722lnr, Int32 w747lnr)
   at CLRKalkyle.CLRKalkyle.GenKalkyle(Int32 klientnr, Int32 w747lnr)
I'm using SAServerSideConnection without transaction (the CLR is called per row in the database).
Is it possible to run the update in a new thread, or perhaps a new connection?
Or do I have to run the update after all the other code is finished?
Hope you understand my problem.
Regards,
Bjarne Anker

Answer 1

This is the trigger:
ALTER TRIGGER "wau_w747_maaoppdat_on" after update of MaaOppdateres
order 2 on MTS.W747KalkyleData
referencing old as old_name new as new_name
for each row when(old_name.MaaOppdateres = 0 and new_name.MaaOppdateres = 1)
begin
    call spw_GenKalkyle_w747lnr(new_name.klientnr,new_name.w747lnr)
end
Stored procedure:
ALTER PROCEDURE "MTS"."spw_GenKalkyle_w747lnr"( in p1 integer,in p2 integer )
external name 'D:\\SVN\\Trading\\CLRKalkyle\\CLRKalkyle\\bin\\Release\\CLRKalkyle.dll::CLRKalkyle.CLRKalkyle.GenKalkyle(int,int)' language clr
This is where the exception occurs in the program:
sql = @"update w747kalkyledata w747
set w747.maaoppdateres = 1
from w722fakturalinje w722
where w722.KlientNr = ?
and w722.TilgangsType = ?
and w722.TilgangsNr = ?
and w722.tilgangsnr > 0
and w722.klientnr = w747.klientnr
and w722.uttakstype = w747.uttakstype
and w722.uttaksnr = w747.uttaksnr
and w722.w722lnr = w747.w722lnr
and w722.uttakstype = 'DF'
and w747.maaoppdateres = 0";
SAServerSideConnection.Connection.Execute(sql, palle.klientnr, palle.tilgangstype, palle.tilgangsnr);
In short, the trigger is at the table W747 and the code fails when running the update against the same table.
I guess it would be best to send the sourcecode via email if you need to look at the whole picture.
Regards,
Bjarne Anker