Examples of com.hp.hpl.jena.query.Query

com.hp.hpl.jena.query.Query
The data structure for a query as presented externally. There are two ways of creating a query - use the parser to turn a string description of the query into the executable form, and the programmatic way (the parser is calling the programmatic operations driven by the quyery string). The declarative approach of passing in a string is preferred. Once a query is built, it can be passed to the QueryFactory to produce a query execution engine. @see QueryExecutionFactory @see ResultSet

   */
  public static void main(String[] args)
  {
    Model config = FileManager.get().loadModel("map.n3");
    
    Query query = QueryFactory.create(
        "prefix rdf:    <http://www.w3.org/1999/02/22-rdf-syntax-ns#> \n" +
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "prefix hp: <http://jena.hpl.hp.com/schemas/hpcorp#> \n" +
        "\n" +
        "select ?n where \n" +

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  }
  
  /* Full SPARQL Query */
  public void test8()
  {
    Query query = QueryFactory.create(
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "prefix hp: <http://jena.hpl.hp.com/schemas/hpcorp#> \n" +
        "\n" +
        "select * where \n" +
        "{\n" +

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  }
  
  /* This will fail -- no lat and long for bristol (?) */
  public void testNegPos()
  {
    Query query = QueryFactory.create(
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "prefix hp: <http://jena.hpl.hp.com/schemas/hpcorp#> \n" +
        "prefix geo: <http://www.w3.org/2003/01/geo/wgs84_pos#> \n" +
        "\n" +
        "select * where \n" +

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  }
  
  /* There is a country, however */
  public void testPosPos()
  {
    Query query = QueryFactory.create(
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "prefix hp: <http://jena.hpl.hp.com/schemas/hpcorp#> \n" +
        "\n" +
        "select * where \n" +
        "{\n" +

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  }
  
  /* As above, but ASK */
  public void testNegAskPos()
  {
    Query query = QueryFactory.create(
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "prefix hp: <http://jena.hpl.hp.com/schemas/hpcorp#> \n" +
        "\n" +
        "ask where \n" +
        "{\n" +

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  }
  
  /* A positive ask */
  public void testPosAskPos()
  {
    Query query = QueryFactory.create(
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "prefix hp: <http://jena.hpl.hp.com/schemas/hpcorp#> \n" +
        "\n" +
        "ask where \n" +
        "{\n" +

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  }
  
  /* Very simple, but possibly tricky... */
  public void testTripleExists()
  {
    Query query = QueryFactory.create(
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "\n" +
        "select * where \n" +
        "{\n" +
        " <ldap://ldap.hp.com/uid=damian.steer@hp.com,%20ou=people,%20o=hp.com> \n" +

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  }
  
  /* Very simple, but possibly tricky... -- negative version of above */
  public void testTripleNotExists()
  {
    Query query = QueryFactory.create(
        "prefix foaf: <http://xmlns.com/foaf/0.1/> \n" +
        "\n" +
        "select * where \n" +
        "{\n" +
        " <ldap://ldap.hp.com/uid=damian.steer@hp.com,%20ou=people,%20o=hp.com> \n" +

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        query("SELECT DISTINCT ?o { ?s ?p ?o }", storeDesc, jdbc) ;
    }
    
    public static void query(String queryString, StoreDesc storeDesc, Connection jdbcConnection)
    {
        Query query = QueryFactory.create(queryString) ;


        SDBConnection conn = new SDBConnection(jdbcConnection) ;
        
        Store store = StoreFactory.create(storeDesc, conn) ;

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    }


    private static void example(Dataset ds, String qs, Filter<Tuple<NodeId>> filter)
    {
        System.out.println() ;
        Query query = QueryFactory.create(qs) ;
        System.out.println(qs) ;
        QueryExecution qExec = QueryExecutionFactory.create(query, ds) ;
        // Install filter for this query only.
        if ( filter != null )
        {

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