我想使用 R2RML 和 Virtuoso 从 MySql 源映射一些表。我有一个带有“事物”的表,我希望它们具有不是 URI 而是来自通过 thingID 连接的表“值”的名称列的谓词。我可以通过“Thing”的 ID 将表“Values”映射到“Values”的 thingId - 但是通过这种映射,我只能获得相应“Values”条目的 URI。我想要的是存储在“值”列中的字符串。
预期的三元组应该是例如:
<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
值表示例:
ID thingId Value
1 1 VMware Virtual Platform
到目前为止,这是我的映射:
<#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" ]; ] .