e13954sql挂起

XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
1SQL,XQuery,andSPARQLWhat'sWrongWithThisPictureXQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
2JimMelton,OracleCorp.
Editor:allpartsofSQLstandardEditor:XQueryF&O,XQueryXCo-chair:W3CXMLQueryWGAuthor:5SQLbooks,forthcoming"QueryingXML"fromMorganKaufmannXQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
3QueryLanguages:SQL(SQLQueryLanguage)Alanguageforqueryingcollectionsoftuples:SELECTSALARY,HIRE_DATEFROMEMPSWHEREEMP_ID=13954EMP_IDNAMEHIRE_DATESALARY13954Joe2000-04-144800010335Mary1998-11-2352000…………04182Bob2005-02-1021750XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
4QueryLanguages:XQuery(XMLQuery)AlanguageforqueryingtreesofXDMnodes:for$eindocument(my_employees.
xml)where$emp/emp/@emp-id=13954return$emp/emp/salaryemp-id=13954Joe2000-04-1448000.
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XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
5CrossingDataModelBoundariesSQL/XMLEMP_IDNAMEHIRE_DATESALARY13954Joe2000-04-144800010335Mary1998-11-2352000…………04182Bob2005-02-1021750PublishingFunctionsXMLTableemp-id=13954Joe2000-04-1448000.
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XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
6RDF:CollectionsofTuples(ResourceDescriptionFramework)3-tuples:subject,predicate,objectemps:e13954HR:name'Joe'emps:e13954HR:hire-date2000-04-14emps:e13954HR:salary48000RDFinatable:TrivialSQLstatement:SELECTobjectFROMRDFtableWHEREsubject="emps:e13954"SubjectPredicateObjectemps:e13954HR:name'Joe'emps:e13954HR:hire-date2000-04-14emps:e13954HR:salary48000XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
7RDF:NotQuiteThatSimpleRDFcanindicatemembershipinclasses(emps:e13954rdf:typeHR:employee)RDFprefixesareshorthandforfullURIsRDFisagraphdatamodelHR:empemps:e13954emps:e10335dept:salesrdf:typerdf:typeHR:supervisesHR:managesHR:worksInHR:emprdf:typeXQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
8OWL(WebOntologyLanguage)AparticularvocabularyofRDFRepresentsmeaningsoftermsandrelationshipsbetweenterms:anontologyOWLaddstoRDF:–Relationsbetweenclasses–Cardinality–Equality–Moretypingofandcharacteristicsofproperties–EnumeratedclassesXQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
9RDFvsTheRelationalModelRelational–Flat,tabular,implicittyping(columndefinition)–Joinsusedtocombineinformationfromtables–Foreignkeys:semanticsandgraph-likestructure–Eachtable:manycolumns=manyattributesofobjectRDF–Maybeviewedasflat;explicittypingcommon–Explicitrelationshipsviapredicates–Inherentgraphstructureviolates"flatness"–TriplesformE-Rmodel(similartoatablew/2columns)XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
10RDFvsXDMXDM–Tree-structuredplussequencesofitems–Nosupportforexplicitrelationships(references)–Notuples,notlimitedbytuplesRDF–Networkofobjects;moregeneralthantrees–Relationships/referencesarethepointofRDF–TriplenaturecreatesplethoraoftinydataXQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
11QueryLanguages:SPARQL(SPARQLProtocolAndRDFQueryLanguage)Designedtoquerycollectionsoftriples……andtoeasilytraverserelationshipsVaguelySQL-likesyntax(SELECT,WHERE)"Matchesgraphpatterns"SELECTsalWHERE{emps:e13954HR:salarysal.
}XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
12SPARQLvsSQLSPARQLSELECTsalWHERE{emps:e13954HR:salarysal.
}SQLSELECTsalaryFROMemployeesWHEREemp_id='e13954'XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
13SPARQLvsSQLSPARQLSELECTid,salWHERE{idHR:salarysal}SQLSELECTemp_id,salaryFROMemployeesXQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
14SPARQLvsSQLSPARQLSELECThdateWHERE{idHR:salarysal.
idHR:hire_datehdate.
FILTERsal>=21750}SQLSELECThire_dateFROMemployeesWHEREsalary>=21750XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
15SPARQLvsSQLSPARQLSELECThdateWHERE{idHR:salarysal.
idHR:hire_datehdate.
FILTERsal>=21750}SQLSELECTv.
hire_dateFROMemp_varsASv,emp_constsAScWHEREv.
salary>=21750ANDv.
emp_id=c.
emp_idXQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
16ConclusionsSQL:Greatforfindingdatafromtabularrepresentations,cangetcomplexwhenmanytablesareinvolvedinagivenqueryXQuery:Greatforfindingdataintreerepresentations,cangetcomplexwhenmanyrelationshipshavetobetraversedSPARQL:Goodpatternmatchingparadigm,especiallywhenrelationshipshavetobeusedtoansweraquerySurprisingconclusion:SPARQLcanbetranslatedtoSQLandpossiblytoXQuery!
XQuerySPARQLSQL2005-11-16Copyright2005OracleCorp.
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