[redland-dev] json serialization (again)

Fri Oct 6 02:20:39 UTC 2006

Woohoo!  Figured it out.  So Ubuntu comes with an older version of
librdf and such already installed, so it was finding those first as they
reside in /usr/lib, and I'd installed to /usr/local/lib.  Changed to
./configure --prefix=/usr/lib and everything worked great!

Eric

Eric Hanson wrote:
> I had this working at one point [1] but now I reinstalled Linux and
> can't get it working anymore:
> 
> 1. install redland-1.0.4 from source
> 2. download & install latest ruby bindings from the svn repository which
> contain patches that make json-serialization possible
> 3. do the following:
> 
> ---
> eric at vector:~$ cat redland.rb
> require 'rdf/redland.rb'
> queryStr = 'select ?s ?p ?o where {?s ?p ?o}'
> store = Redland::HashStore.read_store('test', '/usr/local/redland-data',
> false)
> model = Redland::Model.new(store)
> query = Redland::Query.new(queryStr, 'sparql')
> results = query.execute(model)
> # print
> results.to_string(Redland::Uri.new("http://www.w3.org/TR/2004/WD-rdf-sparql-XMLres-20041221/"),
> nil)
> print
> results.to_string(Redland::Uri.new("http://www.w3.org/2001/sw/DataAccess/json-sparql/"),
> nil)
> 
> print 'store:',store,"\n"
> print 'model:',model,"\n"
> print 'query:',query,"\n"
> print 'results:',results,"\n"
> eric at vector:~$ ruby redland.rb
> store:#<Redland::HashStore:0xb7c52db8>
> model:#<Redland::Model:0xb7c52bd8>
> query:#<Redland::Query:0xb7c52afc>
> results:#<Redland::QueryResults:0xb7c52a20>
> eric at vector:~$
> ---
> 
> It prints nothing.
> 
> Now if I uncomment the rdf-sparql-XMLres line, it prints XML results
> just fine:
> 
> ---
> eric at vector:~$ cat redland.rb
> require 'rdf/redland.rb'
> queryStr = 'select ?s ?p ?o where {?s ?p ?o}'
> store = Redland::HashStore.read_store('test', '/usr/local/redland-data',
> false)
> model = Redland::Model.new(store)
> query = Redland::Query.new(queryStr, 'sparql')
> results = query.execute(model)
> print
> results.to_string(Redland::Uri.new("http://www.w3.org/TR/2004/WD-rdf-sparql-XMLres-20041221/"),
> nil)
> # print
> results.to_string(Redland::Uri.new("http://www.w3.org/2001/sw/DataAccess/json-sparql/"),
> nil)
> 
> print 'store:',store,"\n"
> print 'model:',model,"\n"
> print 'query:',query,"\n"
> print 'results:',results,"\n"
> eric at vector:~$ ruby redland.rb
> <?xml version="1.0" encoding="utf-8"?>
> <?xml version="1.0"?>
> <sparql xmlns="http://www.w3.org/2001/sw/DataAccess/rf1/result">
>   <head>
>     <variable name="s"/>
>     <variable name="p"/>
>     <variable name="o"/>
>   </head>
>   <results>
>     <result>
>       <s uri="a"/>
>       <p uri="b"/>
>       <o>c</o>
>     </result>
>     <result>
>       <s uri="a"/>
>       <p uri="b"/>
>       <o>cd</o>
>     </result>
>     <result>
>       <s uri="a"/>
>       <p uri="b"/>
>       <o>cde</o>
>     </result>
>     <result>
>       <s uri="a"/>
>       <p uri="b"/>
>       <o>cdef</o>
>     </result>
>   </results>
> </sparql>
> store:#<Redland::HashStore:0xb7cf0db8>
> model:#<Redland::Model:0xb7cf0bd8>
> query:#<Redland::Query:0xb7cf0afc>
> results:#<Redland::QueryResults:0xb7cf0a20>
> eric at vector:~$
> ---
> 
> With the URL I'm using, it behaves the same as if I used a totally
> random URL.  I had the JSON serialization working at one point, I'm
> wondering what changed in my environment to make it break.  I thought it
> was working with 1.0.4 without any patches, but an afternoon later and
> I'm still spinning my wheels.  Any ideas would be greatly appreciated!
> 
> Thanks,
> Eric
> 
> [1]http://lists.gnomehack.com/pipermail/redland-dev/2006-July/001373.html
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