Hi Lorenz, thanks, but wouldn't these methods append VALUES at the end of the query? Which would not be equivalent to having it injected at the beginning?
I don't want to build the whole query with Java -- I already have a query string. Martynas On Mon, Nov 25, 2024 at 7:58 AM Lorenz Buehmann <buehm...@informatik.uni-leipzig.de> wrote: > > Hi, > > you mentioned a query builder, so did you try to use the Jena query > builder already? If so, > > the method addWhereValueVars on the SelectBuilder[1] or directly on the > WhereBuilder[2] would be the way to go. > > > Cheers, > > Lorenz > > [1] > https://jena.apache.org/documentation/javadoc/extras/querybuilder/org.apache.jena.querybuilder/org/apache/jena/arq/querybuilder/SelectBuilder.html#addWhereValueVars(java.util.Map) > > > [2] > https://jena.apache.org/documentation/javadoc/extras/querybuilder/org.apache.jena.querybuilder/org/apache/jena/arq/querybuilder/WhereBuilder.html#addWhereValueVars(java.util.Map) > > > On 25.11.24 01:02, David Habgood wrote: > > Hi Martynas, > > > > Do you know ahead of time which variable(s) you're going to be injecting > > the VALUES clause for? > > > > I've been using a pattern where I add VALUES ?this { UNDEF } in "template" > > queries, then at runtime parse the query and replace "UNDEF" (where all of > > the DataBlockValue <https://www.w3.org/TR/sparql11-query/#rDataBlockValue>s > > in a binding within a InlineDataFull are "UNDEF") with a set of bindings > > supplied at runtime. This has the benefit that if you do not supply a > > binding for ?this, UNDEF means it is left unbound. > > > > Thanks, > > > > On Mon, Nov 25, 2024 at 9:40 AM Martynas Jusevičius <marty...@atomgraph.com> > > wrote: > > > >> Hi, > >> > >> What would be the simplest way to safely (i.e. using query builder or > >> algebra) to inject a VALUES block at the beginning of a query? > >> > >> For example > >> > >> SELECT * > >> { > >> ?this ?p ?o > >> } > >> > >> should become > >> > >> SELECT * > >> { > >> VALUES ?this <http://localhost> > >> ?this ?p ?o > >> } > >> > >> after the injection. > >> > >> Thanks, > >> > >> Martynas > >> > -- > Lorenz Bühmann > Research Associate/Scientific Developer > > Email buehm...@infai.org > > Institute for Applied Informatics e.V. (InfAI) | Goerdelerring 9 | 04109 > Leipzig | Germany >
