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16.7.7. Generate Transient and/or Persistent Linked Data Views atop Remote Relational Data Sources Using Conductor

This section describes how you can generate R2RML Scripts from Linked Data Views, using the Virtuoso Conductor ODBC or JDBC accessible.

  1. Ensure you have installed Conductor conductor_dav.vad VAD package with version 1.32.38 or higher.

  2. Go to http://<cname>[:<port>]/conductor.

  3. Enter dba credentials.

  4. Go to Linked Data -> Views:

    Figure 16.74. Generating Transient and/or Persistent Linked Data Views

    Generating Transient and/or Persistent Linked Data Views

  5. Select Qualifier Demo:

    Figure 16.75. Generating Transient and/or Persistent Linked Data Views

    Generating Transient and/or Persistent Linked Data Views

  6. Select table(s) by hatching the check-box to the left of the table name; for example, select the following tables from the Northwind DB: Categories, Customers, Employees, Order_Details, Orders, Products .

    Figure 16.76. Generating Transient and/or Persistent Linked Data Views

    Generating Transient and/or Persistent Linked Data Views

  7. Click Generate via Wizard:

    Figure 16.77. Generating Transient and/or Persistent Linked Data Views

    Generating Transient and/or Persistent Linked Data Views

  8. Click Prepare to Execute.

  9. The R2RML script for the selected table(s) will be generated and displayed in the R2RML Graph text-area:

    Figure 16.78. Generating Transient and/or Persistent Linked Data Views

    Generating Transient and/or Persistent Linked Data Views

    Figure 16.79. Generating Transient and/or Persistent Linked Data Views

    Generating Transient and/or Persistent Linked Data Views

    Figure 16.80. Generating Transient and/or Persistent Linked Data Views

    Generating Transient and/or Persistent Linked Data Views

  10. As result the following R2RML script should be generated for the Northwind DB collection: 

    @prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix Demo: <http://demo.openlinksw.com/schemas/Demo/> .
@prefix demo-stat: <http://demo.openlinksw.com/Demo/stat#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix void: <http://rdfs.org/ns/void#> .
@prefix scovo: <http://purl.org/NET/scovo#> .
@prefix aowl: <http://bblfish.net/work/atom-owl/2006-06-06/> .

<#TriplesMapCategories> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "Demo" ; rr:tableOwner "demo" ; rr:tableName "Categories" ];
rr:subjectMap [ rr:termtype "IRI"  ; rr:template "http://demo.openlinksw.com/Demo/categories/{CategoryID}"; rr:class Demo:Categories; ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:categoryid ] ; rr:objectMap [ rr:column "CategoryID" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:categoryname ] ; rr:objectMap [ rr:column "CategoryName" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:description ] ; rr:objectMap [ rr:column "Description" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:picture ] ; rr:objectMap [ rr:column "Picture" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:categories_of_products ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapProducts>;  rr:joinCondition [ rr:child "CategoryID" ; rr:parent "CategoryID" ] ; ]; ] .

<#TriplesMapCustomers> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "Demo" ; rr:tableOwner "demo" ; rr:tableName "Customers" ];
rr:subjectMap [ rr:termtype "IRI"  ; rr:template "http://demo.openlinksw.com/Demo/customers/{CustomerID}"; rr:class Demo:Customers; ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:customerid ] ; rr:objectMap [ rr:column "CustomerID" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:companyname ] ; rr:objectMap [ rr:column "CompanyName" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:contactname ] ; rr:objectMap [ rr:column "ContactName" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:contacttitle ] ; rr:objectMap [ rr:column "ContactTitle" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:address ] ; rr:objectMap [ rr:column "Address" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:city ] ; rr:objectMap [ rr:column "City" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:region ] ; rr:objectMap [ rr:column "Region" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:postalcode ] ; rr:objectMap [ rr:column "PostalCode" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:country ] ; rr:objectMap [ rr:column "Country" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:countrycode ] ; rr:objectMap [ rr:column "CountryCode" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:phone ] ; rr:objectMap [ rr:column "Phone" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:fax ] ; rr:objectMap [ rr:column "Fax" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:customers_of_orders ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapOrders>;  rr:joinCondition [ rr:child "CustomerID" ; rr:parent "CustomerID" ] ; ]; ] .

<#TriplesMapEmployees> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "Demo" ; rr:tableOwner "demo" ; rr:tableName "Employees" ];
rr:subjectMap [ rr:termtype "IRI"  ; rr:template "http://demo.openlinksw.com/Demo/employees/{EmployeeID}"; rr:class Demo:Employees; ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:employeeid ] ; rr:objectMap [ rr:column "EmployeeID" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:lastname ] ; rr:objectMap [ rr:column "LastName" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:firstname ] ; rr:objectMap [ rr:column "FirstName" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:title ] ; rr:objectMap [ rr:column "Title" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:titleofcourtesy ] ; rr:objectMap [ rr:column "TitleOfCourtesy" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:birthdate ] ; rr:objectMap [ rr:column "BirthDate" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:hiredate ] ; rr:objectMap [ rr:column "HireDate" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:address ] ; rr:objectMap [ rr:column "Address" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:city ] ; rr:objectMap [ rr:column "City" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:region ] ; rr:objectMap [ rr:column "Region" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:postalcode ] ; rr:objectMap [ rr:column "PostalCode" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:country ] ; rr:objectMap [ rr:column "Country" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:countrycode ] ; rr:objectMap [ rr:column "CountryCode" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:homephone ] ; rr:objectMap [ rr:column "HomePhone" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:extension ] ; rr:objectMap [ rr:column "Extension" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:photo ] ; rr:objectMap [ rr:column "Photo" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:notes ] ; rr:objectMap [ rr:column "Notes" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:reportsto ] ; rr:objectMap [ rr:column "ReportsTo" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:employees_of_orders ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapOrders>;  rr:joinCondition [ rr:child "EmployeeID" ; rr:parent "EmployeeID" ] ; ]; ] .

<#TriplesMapOrder_Details> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "Demo" ; rr:tableOwner "demo" ; rr:tableName "Order_Details" ];
rr:subjectMap [ rr:termtype "IRI"  ; rr:template "http://demo.openlinksw.com/Demo/order_details/{OrderID}/{ProductID}"; rr:class Demo:Order_Details; ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:unitprice ] ; rr:objectMap [ rr:column "UnitPrice" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:quantity ] ; rr:objectMap [ rr:column "Quantity" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:discount ] ; rr:objectMap [ rr:column "Discount" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:order_details_has_orders ] ; rr:objectMap [ rr:termtype "IRI" ; rr:template "http://demo.openlinksw.com/Demo/orders/{OrderID}" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:order_details_has_products ] ; rr:objectMap [ rr:termtype "IRI" ; rr:template "http://demo.openlinksw.com/Demo/products/{ProductID}" ]; ] .

<#TriplesMapOrders> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "Demo" ; rr:tableOwner "demo" ; rr:tableName "Orders" ];
rr:subjectMap [ rr:termtype "IRI"  ; rr:template "http://demo.openlinksw.com/Demo/orders/{OrderID}"; rr:class Demo:Orders; ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:orderid ] ; rr:objectMap [ rr:column "OrderID" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:orderdate ] ; rr:objectMap [ rr:column "OrderDate" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:requireddate ] ; rr:objectMap [ rr:column "RequiredDate" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shippeddate ] ; rr:objectMap [ rr:column "ShippedDate" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:freight ] ; rr:objectMap [ rr:column "Freight" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shipname ] ; rr:objectMap [ rr:column "ShipName" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shipaddress ] ; rr:objectMap [ rr:column "ShipAddress" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shipcity ] ; rr:objectMap [ rr:column "ShipCity" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shipregion ] ; rr:objectMap [ rr:column "ShipRegion" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shippostalcode ] ; rr:objectMap [ rr:column "ShipPostalCode" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shipcountry ] ; rr:objectMap [ rr:column "ShipCountry" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:shipcountrycode ] ; rr:objectMap [ rr:column "ShipCountryCode" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:rowguid ] ; rr:objectMap [ rr:column "ROWGUID" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:orders_has_customers ] ; rr:objectMap [ rr:termtype "IRI" ; rr:template "http://demo.openlinksw.com/Demo/customers/{CustomerID}" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:orders_has_employees ] ; rr:objectMap [ rr:termtype "IRI" ; rr:template "http://demo.openlinksw.com/Demo/employees/{EmployeeID}" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:orders_has_shippers ] ; rr:objectMap [ rr:termtype "IRI" ; rr:template "http://demo.openlinksw.com/Demo/shippers/{ShipVia}" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:orders_of_order_details ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapOrder_Details>;  rr:joinCondition [ rr:child "OrderID" ; rr:parent "OrderID" ] ; ]; ] .

<#TriplesMapProducts> a rr:TriplesMap; rr:logicalTable [ rr:tableSchema "Demo" ; rr:tableOwner "demo" ; rr:tableName "Products" ];
rr:subjectMap [ rr:termtype "IRI"  ; rr:template "http://demo.openlinksw.com/Demo/products/{ProductID}"; rr:class Demo:Products; ];
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:productid ] ; rr:objectMap [ rr:column "ProductID" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:productname ] ; rr:objectMap [ rr:column "ProductName" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:quantityperunit ] ; rr:objectMap [ rr:column "QuantityPerUnit" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:unitprice ] ; rr:objectMap [ rr:column "UnitPrice" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:unitsinstock ] ; rr:objectMap [ rr:column "UnitsInStock" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:unitsonorder ] ; rr:objectMap [ rr:column "UnitsOnOrder" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:reorderlevel ] ; rr:objectMap [ rr:column "ReorderLevel" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:discontinued ] ; rr:objectMap [ rr:column "Discontinued" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:products_has_categories ] ; rr:objectMap [ rr:termtype "IRI" ; rr:template "http://demo.openlinksw.com/Demo/categories/{CategoryID}" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:products_has_suppliers ] ; rr:objectMap [ rr:termtype "IRI" ; rr:template "http://demo.openlinksw.com/Demo/suppliers/{SupplierID}" ]; ] ;
rr:predicateObjectMap [ rr:predicateMap [ rr:constant Demo:products_of_order_details ] ; rr:objectMap [ rr:parentTriplesMap <#TriplesMapOrder_Details>;  rr:joinCondition [ rr:child "ProductID" ; rr:parent "ProductID" ] ; ]; ] .
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