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OVRDBF and SECURE() keyword in an ILE environment
Question:
Does anyone know what the SECURE() keyword is supposed to do on the OVRDBF?
It seems to have no effect at all.
Also, is it true that OVR's are not scoped to the call level in a native
ILE application but rather they are scoped to an activation group name?
IOW, if I have programs A, B, and C all compiled to run in activation group
FUNNY, and program A calls, B calls C, and C does an override to file PF,
and then returns to B which in turn returns to A which performs an OPEN on
file PF -- will program A use this OVR?
Did you get that?
Answer(s):
The ILE program must be running in an ILE activation group for activation
group level scoping to take effect. If it is running in the default
activation group, call level scoping will be in effect.
Thanks for the tip! I'll go back and re-read your News/400 article, and
perhaps we will change our OVR commands to use *CALLLVL. Actually, I'm not
even sure this will work.
You see, we are creating a proecdure called CRTHUBDDM() that the user will
call from their programs. This procedure will create a DMM to the "hub"
machine Db, and override the "F" spec to use this DDM file. The problem
is, trying to determine if there are any outstanding overrides in effect
already against this file that the tool will OVR() unbeknownst to the
programmer.
If you do the following:
PGMA issues OVRDBF FILE(FUNNY) TOFILE(*LIBL/FUNNY) SECURE(*YES)
This then calls PGMB which calls PGMC
PGMC issues OVRDBF FILE(FUNNY) TOFILE(QGPL/FUNNY) SECURE(*NO) <--the default value PGMC then tries to OPEN file FUNNY. The original override will be the one in effect. If the second OVRDBF also specified SECURE(*YES) then the second override would be in effect. If an ILE program issues an OVRDBF command and the OVRSCOPE parameter is left at *ACTGRPDFN, then the scenario you describe will be true. If you specify OVRSCOPE(*CALLLVL), then it will work the "old" way. We were severely burned by this when we converted everything to ILE. I had a tech tip published in News/400 about this a year ago or so. We just went through all of our CL and specified the OVRSCOPE(*CALLLVL) to make the application work as before. Back to the SECURE issue, one interesting situtation I bet that comes up, is that after PGMC goes out of scope, the OVRDBF command that it issued would still be in effect, negating the original OVRDBF. If *CALLLVL were used, then the original OVRDBF would come back into the picture.
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