Re: [dotNetRDF-bugs] Problems with SPARQL update

[Rob V. <rv...@do...>]

Thanks for spotting this, tracked and fixed as CORE-300 [1]

The NPE from MultiDictionary is a weird one and was previously discussed
as CORE-292 [2]

It's a one time check that the MultiDictionary does to determine whether
it should support null keys and is handled so VS should not really report
it as unhanded (though it may report it if you have break on thrown set).
Since a standard Graph has 7 MultiDictionaries in it you can get a lot of
these when running stuff in debug mode.  As it's a one time initialization
thing it should have minimal effect on performance.

Weirdly enough if the PDBs for VDS.Common are present VS will not break on
this error (unless you have break on thrown set), this was the resolution
for that bug and based on feedback I decided to start including the PDBs
in the NuGet packages to aid end user debugging of issues (mean they get
more detailed stack traces with line numbers etc.)

Rob

[1] http://dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=300
[2] http://dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=292

On 1/5/13 5:51 PM, "Tomasz Pluskiewicz" <tom...@gm...>
wrote:

>Hi Rob
>
>I am having additional issues with running my update query.
>
>An equivalent select (without graph ?g {}) returns some data. However
>when I try to create new graphs nothing happens.
>
>I started debugging and discovered that when evaluating the insert
>command, all the results are skipped at InserCommand.cs.
>
>The problem is that VDS.RDF.Query.Algebra.Set holds variable names
>without the question mark and in the insert command they are prefixed.
>
>The quick fix is to add a Substring(1) call when looking for graph
>variablt in the set. Will similar change be required elsewhere in the
>code?
>
>Regards,
>Tom
>
>PS
>When I went into debugger I and enable breaking on exceptions thrown I
>seem to be getting a lot of Null pointer exceptions in
>MultiDictionary. This doesn't seem to be the cause as I had though
>initially but definitiely will have adverse effects on performance.
>
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