# Query (select and paths) named graphs via pystardog **URL:** \ **Category:** Support\ **Created:** [December 6, 2023, 4:29pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748 "2023-12-06T16:29:52Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![Thomas](https://avatars.discourse-cdn.com/v4/letter/t/e36b37/32.png) [@Thomas](https://community.stardog.com/u/Thomas)\ **Post date:** [December 6, 2023, 4:29pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/1 "2023-12-06T16:29:52Z")
Hi everbody, I try to send **select** and **paths** -queries via pystardog. Example python-code: \*with stardog.Connection(self.stardog\_database, \*_self.conn\_details) as conn:_ - ``` sparql_res_dict = conn.select(sparql_query,* ``` - ``` content_type=stardog.content_types.CSV,* ``` - ``` default_graph_uri=["urn:named_graph/me/tco/plant_0780_year_2023"])* ``` The triples are stored in the named graph "urn:named\_graph/me/tco/plant\_0780\_year\_2023". To clarify the data structure in the db see the result from stardog studio: query: SELECT \* WHERE { GRAPH ?g { {?s ?p ?o} } } Result: | urn:named\_graph/me/tco/plant\_0780\_year\_2023 | [http://www.semantic.bosch.com/ae-testing/2022/8/product\_costing\_01](http://www.semantic.bosch.com/ae-testing/2022/8/product_costing_01) | rdf:type | owl:Ontology | | --- | --- | --- | --- | | urn:named\_graph/me/tco/plant\_0780\_year\_2023 | pco:Costcenter\_1234567 | rdf:type | pco:CostCenter | | ... | | | | | The above python code returns no results. | | | | | If I add | | | | | FROM urn:named\_graph/me/tco/plant\_0780\_year\_2023 | | | | | to the query in the python code, it does return results. | | | | | To my understanding the parameter | | | | | default\_graph\_uri=["urn:named\_graph/me/tco/plant\_0780\_year\_2023"] | | | | | should work like the FROM ... in the query - but it does not. | | | | The above is also true for a paths-query issued by stardog (see above) and stardog studio. As a workaround I can insert the FROM statement into the select query. But for a path query this workaround is not possible - there i need the parameter default\_graph\_uri=["urn:named\_graph/me/tco/plant\_0780\_year\_2023"] Where is the error in using the default\_graph\_uri - parameter? Thanks, Thomas ---
**Author:** ![Lars\_Heling](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/lars_heling/32/1657_2.png) [@Lars\_Heling](https://community.stardog.com/u/Lars_Heling)\ **Post date:** [December 7, 2023, 2:21pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/2 "2023-12-07T14:21:01Z")
Hi Thomas, I am not sure if I follow your code example since it is a bit difficult to read due to the formatting. You should be able to retrieve the from the named graph using the `default_graph_uri `. For example, if you insert data in the DB as follows ```auto INSERT DATA { GRAPH { :a :b :c . } } ``` you should be able to retrieve the data from the named graph with ```auto results = conn.select('select * { ?s ?p ?o }', default_graph_uri=["urn:myNamedGraph"]) ``` I hope this clarifies your problem. If not, it would be helpful if you could share some details on the query you are trying to execute. Best regards Lars ---
**Author:** ![Thomas](https://avatars.discourse-cdn.com/v4/letter/t/e36b37/32.png) [@Thomas](https://community.stardog.com/u/Thomas)\ **Post date:** [December 7, 2023, 3:31pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/3 "2023-12-07T15:31:22Z")
Hi Lars, thanks for the quick reply. Actually, what you write is exactly what i do - with one difference: I do write the triples to the db using the following code: ```auto def write_file_to_graph(self, graph_uri: str, file_name: str): with stardog.Connection(self.stardog_database, **self.conn_details) as conn: conn.begin() file_path = path.join(loadEnvVar('DAYDIR'), f'{file_name}_{date.today()}.ttl') conn.add(content=stardog.content.File(file_path), graph_uri=graph_uri) conn.commit() ``` where: graph\_uri = 'urn:named\_graph/me/tco/plant\_0780\_year\_2023' I will try to insert test data using your insert-Data-query and see, if that makes a difference ... Regards, Thomas ---
**Author:** ![Thomas](https://avatars.discourse-cdn.com/v4/letter/t/e36b37/32.png) [@Thomas](https://community.stardog.com/u/Thomas)\ **Post date:** [December 8, 2023, 9:59am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/4 "2023-12-08T09:59:25Z")
Hi Lars, i tried your solution but have to say, that it does not work. I added the data to a db where there are already some data in the default graph. So using stardog studio, i can differentiate between querying the default graph and the named graph "urn:myNamedGraph". Trying the same via the pystardog api always returns the data from the default graph. It seems that the parameter "default\_graph\_uri" is not effective. Can you confirm that your solution does actually work (try-out done)? Or might there be an implementation error in the pystardog module? Thanks, Thomas ---
**Author:** ![Lars\_Heling](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/lars_heling/32/1657_2.png) [@Lars\_Heling](https://community.stardog.com/u/Lars_Heling)\ **Post date:** [December 8, 2023, 10:33am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/5 "2023-12-08T10:33:18Z")
Hi Thomas, I can confirm that the `default_graph_uri` parameter works as expected for pystardog. For example, when I execute the following example script: ```python import stardog import stardog.content_types conn_details = { 'endpoint': 'http://localhost:5820', 'username': 'user', 'password': 'pw' } data_dg = """ [] rdfs:label "Default Graph" . """ data_ng = """ [] rdfs:label "Named Graph" . """ with stardog.Connection('testing', **conn_details) as conn: # Clear the data in the DB and add data to the default and named graph conn.begin() conn.clear() conn.add(content=stardog.content.Raw(data_dg, 'text/turtle', name='dg.ttl')) conn.add(content=stardog.content.Raw(data_ng, 'text/turtle', name='ng.ttl'), graph_uri="urn:ng") conn.commit() # Query the data results = conn.select('select ?o { ?a ?p ?o }', content_type=stardog.content_types.CSV) print(f"Default Graph: {results}") results = conn.select('select ?o { ?a ?p ?o }', default_graph_uri=["urn:ng"], content_type=stardog.content_types.CSV) print(f"Named Graph: {results}") results = conn.select('select ?o from { ?a ?p ?o }', content_type=stardog.content_types.CSV) print(f"Named Graph (FROM): {results}") results = conn.select('select ?o from named { graph ?g { ?a ?p ?o } }', content_type=stardog.content_types.CSV) print(f"Named Graph (FROM NAMED): {results}") results = conn.select('select ?o from stardog:context:local { ?a ?p ?o }', content_type=stardog.content_types.CSV) print(f"All local graphs: {results}") ``` I get the expected results: ```stdout Default Graph: b'o\nDefault Graph\n' Named Graph: b'o\nNamed Graph\n' Named Graph (FROM): b'o\nNamed Graph\n' Named Graph (FROM NAMED): b'o\nNamed Graph\n' All local graphs: b'o\nDefault Graph\nNamed Graph\n' ``` You should be able to reproduce these results on a simple DB for testing. Maybe one thing to check in your code is that the provided graph URIs are not encoded in `<...>`, that is in SPARQL you would use `FROM ` but in the `default_graph_uri ` parameter takes `urn:graph` instead. Best regards Lars ---
**Author:** ![Thomas](https://avatars.discourse-cdn.com/v4/letter/t/e36b37/32.png) [@Thomas](https://community.stardog.com/u/Thomas)\ **Post date:** [December 8, 2023, 11:09am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/6 "2023-12-08T11:09:02Z")
Hello Lars, again thanks a lot for this precise help. I run your script with one change - i used an already existing database. And my output corresponds to my former results (see line 2): ```auto Default Graph: b'o\nDefault Graph\n' Named Graph: b'o\nDefault Graph\n' Named Graph (FROM): b'o\nNamed Graph\n' Named Graph (FROM NAMED): b'o\nNamed Graph\n' All local graphs: b'o\nDefault Graph\nNamed Graph\n' ``` So the problem seems not to be in the code but maybe in the database configuration? Regards, Thomas ---
**Author:** ![Lars\_Heling](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/lars_heling/32/1657_2.png) [@Lars\_Heling](https://community.stardog.com/u/Lars_Heling)\ **Post date:** [December 8, 2023, 1:51pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/7 "2023-12-08T13:51:12Z")
Hi Thomas, could you check which version of `pystardog` you are using? The feature was just recently added to version 0.17.0. Best regards Lars ---
**Author:** ![elegerpurecycle](https://avatars.discourse-cdn.com/v4/letter/e/7ea924/32.png) [@elegerpurecycle](https://community.stardog.com/u/elegerpurecycle)\ **Post date:** [December 8, 2023, 2:13pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/8 "2023-12-08T14:13:41Z")
This was not intended for me. ---
**Author:** ![Thomas](https://avatars.discourse-cdn.com/v4/letter/t/e36b37/32.png) [@Thomas](https://community.stardog.com/u/Thomas)\ **Post date:** [December 8, 2023, 2:22pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/9 "2023-12-08T14:22:37Z")
Hi Lars, you saved my week 🙂 I had the version 0.12.0. running. After upgrading to 0.17.0 I finally get results from my named graphs! Thanks a lot! Best regards, Thomas ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/e/ed66b48a616f505106a4acde3c9cee7e6da9bc67.svg) [@system](https://community.stardog.com/u/system)\ **Post date:** [January 29, 2024, 8:45pm UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/10 "2024-01-29T20:45:55Z")
---
**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/e/ed66b48a616f505106a4acde3c9cee7e6da9bc67.svg) [@system](https://community.stardog.com/u/system)\ **Post date:** [March 26, 2024, 10:19am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/11 "2024-03-26T10:19:01Z")
---
**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/e/ed66b48a616f505106a4acde3c9cee7e6da9bc67.svg) [@system](https://community.stardog.com/u/system)\ **Post date:** [June 14, 2024, 9:03am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/12 "2024-06-14T09:03:17Z")
---
**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/e/ed66b48a616f505106a4acde3c9cee7e6da9bc67.svg) [@system](https://community.stardog.com/u/system)\ **Post date:** [December 17, 2024, 6:52am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/13 "2024-12-17T06:52:35Z")
---
**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/e/ed66b48a616f505106a4acde3c9cee7e6da9bc67.svg) [@system](https://community.stardog.com/u/system)\ **Post date:** [July 19, 2025, 9:23am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/14 "2025-07-19T09:23:41Z")
---
**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/e/ed66b48a616f505106a4acde3c9cee7e6da9bc67.svg) [@system](https://community.stardog.com/u/system)\ **Post date:** [March 10, 2026, 11:58am UTC](https://community.stardog.com/t/query-select-and-paths-named-graphs-via-pystardog/4748/15 "2026-03-10T11:58:21Z")