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Posted to users@jena.apache.org by Arthur Keen <ar...@gmail.com> on 2016/04/06 20:06:50 UTC

Fuseki2: Is it possible to set Default to UnionGraph when creating a dataset.

I create Fuseki 2 Datasets by passing {“dbType” : “mem”, “dbName” : “myDsName”} in the POST request.  However this sets up a dataset with default graph as an individual graph and I would like the behavior of the default graph to be unionDefaultGraph.

I was wondering if it is possible to pass “unionDefaultGraph” : “true” as an additional parameter to cause the dataset’s default graph to be configured to be the unionGraph.

I have added the parameter to my code to test, and it has no effect on the created dataset, so either it is not allowed in the call, or I am using the wrong key, or?

Any help would be appreciated.

-Arthur

protected Response createInstance(Invocation.Builder request, String instanceName) {
    //Fuseki-specific begin
    List<NameValuePair> nvps = new ArrayList<>();
    nvps.add(new BasicNameValuePair("dbType", "mem")); //instance.getInstanceType()));
    nvps.add(new BasicNameValuePair("dbName", "/" + instanceName));
    nvps.add(new BasicNameValuePair("unionDefaultGraph", "true"));
    String entity = URLEncodedUtils.format(nvps, HTTP.DEF_CONTENT_CHARSET.name());
    log.debug(entity);
    return request.post(Entity.entity(entity, MediaType.APPLICATION_FORM_URLENCODED_TYPE));
    // Fuseki-specific end
}

Re: Fuseki2: Is it possible to set Default to UnionGraph when creating a dataset.

Posted by Arthur Keen <ar...@gmail.com>.
Andy

Thanks for your help. 

A

Sent from my iPhone

> On Apr 9, 2016, at 11:01 AM, Andy Seaborne <an...@apache.org> wrote:
> 
>> On 06/04/16 19:06, Arthur Keen wrote:
>> I create Fuseki 2 Datasets by passing {“dbType” : “mem”, “dbName” : “myDsName”} in the POST request.  However this sets up a dataset with default graph as an individual graph and I would like the behavior of the default graph to be unionDefaultGraph.
>> 
>> I was wondering if it is possible to pass “unionDefaultGraph” : “true” as an additional parameter to cause the dataset’s default graph to be configured to be the unionGraph.
>> 
>> I have added the parameter to my code to test, and it has no effect on the created dataset, so either it is not allowed in the call, or I am using the wrong key, or?
>> 
>> Any help would be appreciated.
>> 
>> -Arthur
> 
> Hi Arthur,
> 
> It's not possible at the moment.
> 
> "Provide unionDefaultGraph for all graphs"
> https://issues.apache.org/jira/browse/JENA-1158
> + wiring into Fuseki.
> 
> (I hope there isn't any documentation that promises it at the moment)
> 
> For small amounts of data, using in-memory TDB + unionDefaultGraph in an assembler will work.
> 
>    Andy
> 
>> 
>> protected Response createInstance(Invocation.Builder request, String instanceName) {
>>     //Fuseki-specific begin
>>     List<NameValuePair> nvps = new ArrayList<>();
>>     nvps.add(new BasicNameValuePair("dbType", "mem")); //instance.getInstanceType()));
>>     nvps.add(new BasicNameValuePair("dbName", "/" + instanceName));
>>     nvps.add(new BasicNameValuePair("unionDefaultGraph", "true"));
>>     String entity = URLEncodedUtils.format(nvps, HTTP.DEF_CONTENT_CHARSET.name());
>>     log.debug(entity);
>>     return request.post(Entity.entity(entity, MediaType.APPLICATION_FORM_URLENCODED_TYPE));
>>     // Fuseki-specific end
>> }
>

Re: Fuseki2: Is it possible to set Default to UnionGraph when creating a dataset.

Posted by Andy Seaborne <an...@apache.org>.
On 06/04/16 19:06, Arthur Keen wrote:
> I create Fuseki 2 Datasets by passing {“dbType” : “mem”, “dbName” : “myDsName”} in the POST request.  However this sets up a dataset with default graph as an individual graph and I would like the behavior of the default graph to be unionDefaultGraph.
>
> I was wondering if it is possible to pass “unionDefaultGraph” : “true” as an additional parameter to cause the dataset’s default graph to be configured to be the unionGraph.
>
> I have added the parameter to my code to test, and it has no effect on the created dataset, so either it is not allowed in the call, or I am using the wrong key, or?
>
> Any help would be appreciated.
>
> -Arthur

Hi Arthur,

It's not possible at the moment.

"Provide unionDefaultGraph for all graphs"
https://issues.apache.org/jira/browse/JENA-1158
+ wiring into Fuseki.

(I hope there isn't any documentation that promises it at the moment)

For small amounts of data, using in-memory TDB + unionDefaultGraph in an 
assembler will work.

	Andy

>
> protected Response createInstance(Invocation.Builder request, String instanceName) {
>      //Fuseki-specific begin
>      List<NameValuePair> nvps = new ArrayList<>();
>      nvps.add(new BasicNameValuePair("dbType", "mem")); //instance.getInstanceType()));
>      nvps.add(new BasicNameValuePair("dbName", "/" + instanceName));
>      nvps.add(new BasicNameValuePair("unionDefaultGraph", "true"));
>      String entity = URLEncodedUtils.format(nvps, HTTP.DEF_CONTENT_CHARSET.name());
>      log.debug(entity);
>      return request.post(Entity.entity(entity, MediaType.APPLICATION_FORM_URLENCODED_TYPE));
>      // Fuseki-specific end
> }
>
>