Re: [Virtuoso-users] Unable to drop graph from isql-vt

[Rumi]

Hi Alex,

On 06-Dec-13 1:12 PM, Alex Bondo Andersen wrote:

Thank you for your reply.

I have also tried CLEAR GRAPH and DROP SILENT GRAPH (sorry for not
stating that before), none of these displays the error, yet the graph
is not dropped (when I go look at the graphs through conductor).

Also I have noticed that we sometimes construct the graph as:

alter quad storage virtrdf:DefaultQuadStorage
   from ...
{
   create qs:fields as
       graph iri ("http://172.25.11.87:8890/data/agriculture";)
   {
...

I realize that this may cause problems and I will work toward one
convention. Is there a different way to drop GRAPH IRIs than GRAPHs?
Which one is the 'right' way to go?

Alright, so the graph is used in a quad map is good to know.
DROP GRAPH works for physical quads but not for mapping.

What you need to do is to drop first the mapping, and then drop the graph.

Best Regards,
Rumi Kocis

That is also an reason for you getting the error -- because the graph is used as a constant graph of some quad map.

2013/12/6 Rumi <rtsek...@openlinksw.com>:

Hi Alex,


On 03-Dec-13 2:59 PM, Alex Bondo Andersen wrote:

Hi,

Some graphs I cannot drop from the isql-vt interface using "sparql
DROP GRAPH <http://extbi.cs.aau.dk/data/agriculture>;", I get the
following error:

*** Error 22023: [Virtuoso Driver][Virtuoso Server]SPARUL_DROP()
failed: graph <http://extbi.cs.aau.dk/data/agriculture> has not been
explicitly created

Yes. The error is correct, since your graph was not explicitly created.
DROP GRAPH is equivalent of CLEAR GRAPH. It requires initially the graph to
be created explicitly.

CREATE GRAPH <mygraph>

is an example of a graph created explicitly.


We recommend in cases of you are not sure whether the graph is created
explicitly or not, to use:

DROP SILENT GRAPH <graph>


Hope this helps.


More documentation info: --
"Example for delete graph equivalence":
http://docs.openlinksw.com/virtuoso/sparqlextensions.html#rdfsparulexamples2


Best Regards,
Rumi

However I can easily drop it from the webpage interface under Linked
Data -> Graphs, where it is showing up.

Is there any way to be "more insistent" that the graph is dropped
through isql-vt?

I should mention that the graph is built inside a quad storage as follows:

alter quad storage virtrdf:DefaultQuadStorage
    from Linked_data.agri.field as field_tbl
    from ...
{
    create qs:fields as
        graph <http://extbi.cs.aau.dk/data/agriculture>
...

smime.p7s
Description: S/MIME Cryptographic Signature

------------------------------------------------------------------------------
Sponsored by Intel(R) XDK 
Develop, test and display web and hybrid apps with a single code base.
Download it for free now!
http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk
_______________________________________________
Virtuoso-users mailing list
Virtuoso-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/virtuoso-users