Jeff,
Please make sure "Overwrite existing database content/Initialize tables"
button is checked. This button is used to both reset or initialize your
database.
Gokhan
On 4/12/2010 7:43 AM, Schmitz, Jeffrey A wrote:
Hmmm, there must be something I'm just not getting. I've tried starting from
scratch. I know I've got a named graph in my SDB database with a URI of:
http://www.boeing.com/IVHM/Golden_StandardNeutralInst.owl
Here is what I'm putting in the Create Jena SDB Database dialogue:
File name: Golden_StandardSDB
Base URI: http://www.boeing.com/IVHM/Golden_StandardNeutralInst.owl
SDB Named Graph URI: http://www.boeing.com/IVHM/Golden_StandardNeutralInst.owl
Database type: MySQL
Service URL: jdbc:mysql://localhost:3306/ivhm
User name:<database username>
Password:<database password>
Overwrite existing database content/Initialize tables is NOT checked
Right now, when I hit Finish I'm getting the following error (I don't think
I've seen this before, but am stuck nonetheless):
Operation failed
Reason: Could not create database
Details: Failed to read prefix ()
Any ideas?
Thanks,
Jeff
-----Original Message-----
From: [email protected] [mailto:topbraid-
[email protected]] On Behalf Of Gokhan Soydan
Sent: Friday, April 09, 2010 7:34 PM
To: [email protected]
Subject: Re: [topbraid-users] Named graphs in SDB
Jeff,
I tried in the SPARQL editor. I can run a simple SPARQL query (with no
need of GRAPH keyword) against an SDB named graph in TBC. The base URI
is not a special base URI, it is just the same as the named graph URI.
The execution of the query also returns results from the imported
non-SDB ontologies.
Gokhan
On 4/6/2010 2:08 PM, Gokhan Soydan wrote:
Jeff,
The base URI is the unique identifier of the ontology in TBC
environment. The SDB named graph URI is used for internal access to
SDB. So they are independent of each other, but they could be the
same
value. I believe that at some point we might make the same URI
automatically, but I would need to discuss more with Holger or Jeremy
on that.
I am trying to understand what doesn't work for you here. Are you
trying to access the triples only in a particular named graph, or are
you trying to access all triples across all named graphs?
Gokhan
On 4/6/2010 7:51 AM, Schmitz, Jeffrey A wrote:
I would suggest using the same graph name and base URI at the
wizard
although as I understand you have different goals here.
Yes, that's what is a little confusing to me, For looking at named
graphs, what is the base URI field supposed to represent?
Anyway, I did try putting the Named Graph URI in both and that
didn't
work either.
Jeff
-----Original Message-----
From: [email protected] [mailto:topbraid-
[email protected]] On Behalf Of Gokhan Soydan
Sent: Tuesday, April 06, 2010 3:19 AM
To: [email protected]
Subject: Re: [topbraid-users] Named graphs in SDB
Jeff,
The default graph and named graphs are stored in separate tables in
the
database. The default graph is stored in a triples table whereas
the
named graphs are all stored in a quad table. The extra column in
the
quad table is for the graph name. The layout is described here:
http://openjena.org/wiki/SDB/Database_Layouts
So, using "urn:x-arg:DefaultGraph" in the SPARQL query or anywhere
else
like base URI should not return anything, if you just have named
graphs
in SDB. As far as I understand from
http://openjena.org/wiki/SDB/Configuration , "urn:x-arq:UnionGraph"
only
works on the union of all SDB named graphs. I am not sure if it
should
support imported ontologies.
The "more than one owl:Ontology" error would be caused by the
contents
of the current ontology. If there is more than one
?x a owl:Ontology
triple, then you would get that error. If you have
"urn:x-arq:UnionGraph" as the base URI, then I assume that triples
are
loaded from all named graphs into the current ontology, which would
contain more than one owl:Ontology triple, i.e. normally one per
named
graph.
I would suggest using the same graph name and base URI at the
wizard
although as I understand you have different goals here. The URIs
"urn:x-arq:DefaultGraph" and "urn:x-arq:UnionGraph" are "safe" to
use
in
SPARQL query datasets as a value of the GRAPH keyword. Their role
in
SDB
querying is described here:
http://openjena.org/wiki/SDB/Configuration
Gokhan
On 4/5/2010 8:36 AM, Schmitz, Jeffrey A wrote:
I'm trying to open a specific named graph using the new feature,
but
can't seem to get it to view it correctly. I know the model is in
there because using java/jena I can write it to file using:
_sdbStore = SDBFactory.connectStore("sdb.ttl");
_baseModel = SDBFactory.connectNamedModel(_sdbStore,
graphURI);
writer.write(baseModel, os, null);
and it works great. I can also submit sparql queries against the
model, run spin inferencing on it, etc. and it seems to work
correctly.
I've tried connecting from TBC using a Base URI of:
urn:x-arq:DefaultGraph
And the URI of my named model (stored in the graphURI variable in
the
above code) as the Named Graph. When I try to connect I'm not
getting
an error or anything, but I can't see any triples either.
I have also tried using for the base URI:
urn:x-arq:UnionGraph
And for that I can see all the triples, but it doesn't process any
of
the import triples in my named graph like it used to for RDB based
models. Should it? Also, I get the "more than one owl:Ontology"
error
when doing it this way.
Thanks,
Jeff
-----Original Message-----
From: [email protected] [mailto:topbraid-
[email protected]] On Behalf Of Scott Henninger
Sent: Thursday, April 01, 2010 11:13 AM
To: TopBraid Suite Users
Subject: [topbraid-users] Named graphs in SDB
Jeff; Yes you can open named graphs in SDB within TopBraid. The
wizards now allow you to specify the name.
Noticed this:
- Feature: Added named graph support to SDB import/export
wizards
Does this include viewing in place, individual SDB named graphs
within topbraid? Sounds like this is only for
importing and exporting named graphs.
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