Re: mib2c usage on tables (bad tables!)

Got it.

I thought min_column and max_column were indexes for the rows and not
for the columns.

Now it is clear. Thanks

jmf



On Tue, 2007-03-27 at 14:38 +0100, Dave Shield wrote:
> On 07/03/07, Joao Miguel Ferreira <[email protected]> wrote:
> > About this piece of code generated by mib2c what is the usage/meaning of
> > min_column and max_column ??
> 
> 'min_column' is the column number of the first (accessible) column in the
> table, and 'max_column' is the column number of the last column.
> 
> For example, sysORTable (in SNMPv2-MIB) is defined as:
> 
> SysOREntry ::= SEQUENCE {
>     sysORIndex     INTEGER,
>     sysORID        OBJECT IDENTIFIER,
>     sysORDescr     DisplayString,
>     sysORUpTime    TimeStamp
> }
> 
> with
>     sysORID OBJECT-TYPE....  ::= { sysOREntry 2 }
> &
>     sysORUpTime OBJECT-TYPE....  ::= { sysOREntry 4 }
> 
> so   min_column=2 and max_column=4
> 
> (Note that sysORIndex is defined as "not-accessible", which
> is why min_column isn't 1)
> 
> 
> > This is part of the table initialization code.... Am I compromising the
> > future possible growth of the table or this is only for initialization
> > purposes ?
> 
> This doesn't affect the number of *rows* in the table - just the
> number of columns.   If the definition of the table changes, then
> you'd have to update these values.  But you'd need to add code
> to handle the new columns anyway.
> 
> 
> > Put it another way: if I simply do not initialize it (ex: max=0, min=0)
> > would the subsequent procedures work ?
> 
> No.
> The agent wouldn't know which columns were valid.
> 
> Dave


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