Re: [Objectbridge-developers] Object Bridge Newbie

[Thomas M. <tho...@ho...>]

Hi Charles,

Right now the XML FieldDescriptors MUST be in the same sequence as the
COLUMNS of the underlying table. AND their ids must match the
column-number.
I.e. the first descriptor must map on column one and have the id 1.
The nth descriptor must map on column n and must have id n.

But you have discovered a little inconsistency: for inserts the exact
numbering is currently not checked.

I will fix this inconsistency. After this fix the descriptors must only
have an ID matching the column number.

HTH,

Thomas


Charles Anthony wrote:
> 
> Hi All,
> 
> I'm beginning to play about using OJB with some of my own classes and
> tables, and I seem to be getting some bizarre behaviour; it seems that
> setting an attribute on a class tries to modify a different column on the
> database than is specified in the mapping file. This only seems to happen on
> an update, not on an insert.
> 
> It seems that the order of FieldDescriptors in the file is significant; and
> possibly the id attribute of the FieldDesciptor.
> 
> I think perhaps I might be able to dig a little more out about whats going
> on if I understood how OJB uses the mapping file; does it cross-reference
> the column in the file with the field on the class by
> a) name ?
> b) position of the FieldDescriptor in the file with the position of the
> field in the class (e.g. the first FieldDescriptor->first declared field in
> the class) ?
> c) id of the FieldDescriptor in the file with the position of the field in
> the class (e.g. <FieldDescriptor id="1"> ->first declared field in the
> class) ?
> d) Something else ?
> 
> a) would seem to me to be the best way of doing it, but I don't think this
> is the way it is done.
> 
> Any help would be welcomed,
> 
> With thanks,
> 
> Charles
> 
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