Package cz.cvut.kbss.jopa.model.annotations

Annotation Interface VariableResult

@Target({})
@Retention(RUNTIME)
public @interface VariableResult

Used in conjunction with the SparqlResultSetMapping annotation or ConstructorResult annotation to map a column of the SELECT list of a SPARQL query.

The name element references the name of a variable in the SELECT list. Scalar result types can be included in the query result by specifying this annotation in the metadata. If the variable is not bound in the result, null is returned.

Example:

     
 Query q = em.createNativeQuery("SELECT ?uri ?label ?comment WHERE {" +
             "?uri a <http://onto.fel.cvut.cz/ontologies/jopa/Example> ;" +
                  "rdfs:label ?label ;" +
                  "rdfs:comment ?comment ." +
         "}", "ExampleResults");
     
 

     
 @SparqlResultSetMapping(name="ExampleResults",
          classes={
              @ConstructorResult(targetClass=cz.cvut.kbss.jopa.Example, variables={
                  @VariableResult(name="uri"),
                  @VariableResult(name="label"),
                  @VariableResult(name="comment")
              }
          }
      )
     
 

See Also:

• SparqlResultSetMapping

Required Element Summary

Required Elements

Modifier and Type	Required Element	Description
String	name	(Required) The name of a variable in the SELECT clause of a SPARQL query.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
Class<?>	type	(Optional) The Java type to which the variable mapping type is to be mapped.

Element Details

name

String name

(Required) The name of a variable in the SELECT clause of a SPARQL query.

type

Class<?> type

(Optional) The Java type to which the variable mapping type is to be mapped.

If the type element is not specified, the default OntoDriver type mapping for the variable mapping will be used.

Default:

void.class