I have my data in more than one model in TDB and I am trying to write a query
that spans across them.
I did try using the following FROM clause.
FROM <urn:x-arq:UnionGraph>
This worked, but there was a long delay in producing results (as compared to
running against one named graph).
So I am guessing that what took so long was that a union was literally being
created before the query was executed.
My hope was that this would just do the query across all the graphs in the
database.
Something else I am trying to get working is using the following in my Ant
script that runs tdbquery.
<target name="tdb.query" >
<java classname="tdb.tdbquery" fork="true" >
<classpath refid="tdb.classpath" />
<arg value="--tdb=${assembler.file}" />
<arg value="--set tdb:unionDefaultGraph=true" />
<arg value="--query=${query}" />
</java>
</target>
Executing 'C:\Program Files\Java\jdk1.6.0_21\jre\bin\java.exe' with arguments:
'-classpath'
'C:\Documents and Settings\davjor\My Documents\Jena\TDB-0.8.11-SNAPSHOT\lib\arq-
Documents\Jena\TDB-0.8.11-SNAPSHOT\lib\jena-2.6.4.jar;C:\Documents and
Settings\ I cut this off, too long.
b\tdb-0.8.11-SNAPSHOT.jar;C:\Documents and Settings\davjor\My Documents\Jena\TDB
'tdb.tdbquery'
'--tdb=db.ttl'
'--set tdb:unionDefaultGraph=true'
'--query=query/haslungcancer.rq'
The ' characters around the executable and arguments are not part of the
command.
Unknown argument: set tdb
The documentation was not clear at all whether there was a particular value to
set unionDefaultGraph to. Is this correct?
Also, any ideas why tdbquery is having a problem with the : ?
I really want to avoid having a union computed up front of the graphs that I
need.
When I directly use named graphs in the query, things don’t work right when I
use a variable spanning across multiple graphs.
David Jordan
Software Developer
SAS Institute Inc.
Health & Life Sciences, Research & Development
Bldg R ▪ Office 4467
600 Research Drive ▪ Cary, NC 27513
Tel: 919 531 1233 ▪ [email protected]<mailto:[email protected]>
www.sas.com<http://www.sas.com>
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