Another question in that order: Now:
SELECT count(*) FROM <http://ao.com/namedGraph/aaa> { { ?s ?p ?o } } returns the number of the triples in aaa, correctly, but: SELECT count(*) FROM NAMED <http://ao.com/namedGraph/aaa> { { ?s ?p ?o } } returns zero. The explanation (in the docs) of the difference between FROM and FROM NAMED is a bit confusing and it’s not enough (for me) to understand, why the first is working and the second is not … S. On 4/10/17, 5:09 PM, "Dimov, Stefan" <[email protected]> wrote: Got it - it’s gotta be a real URI, with http and everything: http://ao.com/aaa The simple names, like: aaa don’t work … S. On 4/10/17, 4:22 PM, "Dimov, Stefan" <[email protected]> wrote: I (almost) got it. Apparently, the data was loaded correctly. Now I can query the names of all the graphs: SELECT DISTINCT $g { GRAPH ?g { ?s ?p ?o } } returns: { "head": { "vars": [ "g" ] } , "results": { "bindings": [ { "g": { "type": "uri" , "value": "aaa" } } , { "g": { "type": "uri" , "value": "bbb" } } , { "g": { "type": "uri" , "value": "ccc" } } , { "g": { "type": "uri" , "value": "ddd" } } , … or the data: SELECT count(*) { GRAPH ?g { ?s ?p ?o } } returns: { "head": { "vars": [ ".1" ] } , "results": { "bindings": [ { ".1": { "type": "literal" , "datatype": "http://www.w3.org/2001/XMLSchema#integer"; , "value": "395721" } } ] } } but I still can’t figure out how to query specific named graph. This: SELECT count(*) { GRAPH <aaa> { ?s ?p ?o } } should work. But actually it returns zero results: { "head": { "vars": [ ".1" ] } , "results": { "bindings": [ { ".1": { "type": "literal" , "datatype": "http://www.w3.org/2001/XMLSchema#integer"; , "value": "0" } } ] } } Any idea? S. On 4/10/17, 2:06 PM, "Dimov, Stefan" <[email protected]> wrote: Hi, I’m using in-mem base and loading multiple named graphs in one data set, iterating thru : private static boolean loadGraphT(Dataset ds) { … String filename = … String graphName = … … Model model = ds.getNamedModel(graphName); ds.begin(ReadWrite.WRITE); FileManager.get().readModel(model, fileName); ds.commit(); ds.end(); return true; } At start, after everything is read and data set is committed, I’m printing out the graph names and their sizes, to check, if everything was loaded: 2017-04-10 13:50:50 INFO Ontology:50 - Named graph aaa - 7855 triples 2017-04-10 13:50:50 INFO Ontology:50 - Named graph bbb - 26 triples 2017-04-10 13:50:50 INFO Ontology:50 - Named graph ccc - 4 triples 2017-04-10 13:50:50 INFO Ontology:50 - Named graph ddd - 20000 triples … After that I’m trying to query some data from a named graph: SELECT count ($s) FROM NAMED <aaa> { { ?s ?p ?o } } or trying to query it without specifying graph: SELECT count ($s) { { ?s ?p ?o } } The result is empty: { "head": { "vars": [ ".1" ] } , "results": { "bindings": [ { ".1": { "type": "literal" , "datatype": "http://www.w3.org/2001/XMLSchema#integer"; , "value": "0" } } ] } } What am I doing wrong? S.
