我想使用R2RML和Virtuoso映射MySql源中的某些表。 我有一個表「Things」,我希望它們的謂詞不是URI,而是來自通過thingID連接的表「Values」中的名稱列。 我可以通過「Thing」的ID將表「Values」映射到「Values」的thingId - 但通過此映射,我只能獲取各個「Values」條目的URI。我想要的是存儲在「Value」列中的字符串。R2RML映射與另一個表中的值
預期所得三重應該是例如:
ID thingId Value
1 1 VMware Virtual Platform
即到目前爲止我的映射::
<#TriplesMapThings> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "exdb" ; rr:tableOwner "ex" ; rr:tableName "Things" ];
rr:subjectMap [ rr:termType rr:IRI ; rr:template "http://localhost:8890/ex/things/{id}"; rr:class ex:Things; rr:graph <http://localhost:8890/ex_test#> ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:id ] ; rr:objectMap [ rr:column "id" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:typeid ] ; rr:objectMap [ rr:column "typeId" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant rdf:type ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapTypes>; rr:joinCondition [rr:child "typeId"; rr:parent "id";]; ];] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:hasValue ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapValues>; rr:joinCondition [rr:child "id"; rr:parent "thingId";]; ];] .
<#TriplesMapTypes> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "exdb" ; rr:tableOwner "ex" ; rr:tableName "Types" ];
rr:subjectMap [ rr:termType rr:IRI ; rr:template "http://localhost:8890/ex/types/{nameUri}"; rr:class owl:Class; rr:graph <http://localhost:8890/ex_test#> ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:id ] ; rr:objectMap [ rr:column "id" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:name ] ; rr:objectMap [ rr:column "name" ]; ] .
<#TriplesMapValues> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "exdb" ; rr:tableOwner "ex" ; rr:tableName "Values" ];
rr:subjectMap [ rr:termType rr:IRI ; rr:template "http://localhost:8890/ex/values/{id}"; rr:class ex:Values; rr:graph <http://localhost:8890/ex_test#> ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant rdf:type ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapAttributes>; rr:joinCondition [rr:child "attributeId"; rr:parent "id";]; ];] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:hasThing ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapThings>; rr:joinCondition [rr:child "thingId"; rr:parent "id";]; ];] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:id ] ; rr:objectMap [ rr:column "id" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:thingid ] ; rr:objectMap [ rr:column "thingId" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant ex:value ] ; rr:objectMap [ rr:column "value" ]; ] .
所述值表的
<http://localhost:8890/ex/things/1> rdf:type <http://localhost:8890/ex/types/vmware> ;
ex:hasValue "Name from the table Values" .
Example of Things table:
ID typeId
1 3
Example of the Types table:
ID Name
3 vmware
實施例