update generated-key before insert

["rcolmegna@tiscali.it" <rc...@tiscali.it>]

hi,

I need to determinate the value of an auto-generated PK before the 
INSERT statement. I'm  trying to use
this SQLs:

1) LOCK TABLE sys.
columns FOR EXCLUSIVE READ
2) SELECT referenceid,
autoincrementvalue+autoincrementinc FROM sys.syscolumns AS sc INNER 
JOIN sys.systables AS st ON sc.referenceid=st.tableid WHERE 
tablename='EMAIL2FOLDER' AND columnname='ID';
3) UPDATE sys.syscolumns 
SET autoincrementvalue=autoincrementvalue+autoincrementinc WHERE 
tableid='f91a0030-0129-e07e-88ec-0000016e72a0' AND idColumnName='ID';

4) use autoinc value, from step-4 select, in my INSERT on the 
destination table

but I obtain an error due to the insufficient 
permission of the connected user (derby is used in embedded mode)
for 
the statement 1 and 3.

Is there any way to escale privileges or to 
create a special permission user-function?

TIA



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