Re: [bdbxml] peculiar behavior in modification

For the benefit of the list, this turned out to be a bug
in BDB XML that can occur if a single XmlModify::execute()
call has steps that both remove and add an attribute to the
same node.  The symptom is a double-delete of memory
that can lead to a crash, depending on your platform.

If anyone thinks they have this problem, the fix is a simple,
one-line change.

Regards,

George


> greetings;
>
> We have been testing DBXML with PHP for quite some time. We noticed  
> the following behavior that
> might be of interest to you:
>
> Given a simple xml doc with ONE attribute only ( e.g., <x      
> id="1"   />) we can do
>   1) addRemoveStep
>   2) addAppendStep
>
> on attribute "id" with one "modify" object.
>
> However, as soon as the doc has more than one attributes (e.g.,  
> <y     id="1"    id2="99" />)
>   the modify()->execute() function crashes during the removal and  
> appeding operations.
>
> It took us a while to track the probelm to this level. I hope you  
> can follow it up further.
>
> I am including two samples programs that can produce the above  
> outcomes.
>
> program "x.php"  works w/ ONE attribute , and program "y.php"
> works w/ TWO attributes, otherwise they are identicial in logic.
>
> regards,
>
> /Farhad
>
>
>


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