Examples of org.exolab.castor.jdo.Query

org.exolab.castor.jdo.Query
A query object. Obtained from the database and used to construct and execute a query on that database. All query operations are bound to the database transaction. Closing the database or the transaction will effectively close the query.
If the query specified parameters these parameters must be set (bound) before executing the query. Execution of the query will result in an enumeration of all the objects found by the query. The query can be re-executed by binding new parameters and calling the {@link #execute()} method a second time. A query can bere-execute while objects are still retrieved from a previous execution. @author Assaf Arkin @version $Revision: 7121 $ $Date: 2006-03-16 16:04:24 -0700 (Thu, 16 Mar 2006) $ @see OQLQuery @see Database#getQuery


        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        Date loadDate = df.parse("2004-04-26");


        String oql = "select t from " + Entity.class.getName() + " t " + " where t.loadDate=$1";
        Query qry = db.getOQLQuery(oql);
        qry.bind(loadDate);
        QueryResults qrs = qry.execute(AccessMode.ReadOnly);
        while (qrs.hasMore()) {
            Entity entity = (Entity) qrs.next();
            if (LOG.isTraceEnabled()) { LOG.trace(entity); }
        }

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        if (_parentId != null) {
            _parent = (PersistentEntity) _db.load(
                    PersistentEntity.class, _parentId, accessMode);
        }


        Query qry = _db.getOQLQuery("SELECT p FROM " + PersistentEntity.class.getName()
                + " p WHERE parentId=$1");
        qry.bind(_id);
        QueryResults res = qry.execute();
        while (res.hasMore()) { _children.addElement(res.next()); }
        _origChildren = (Vector) _children.clone();
        _origRelated = _related;
        return null;
    }

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        if (_parentId != null) {
            _parent = (PersistentObject) _db.load(PersistentObject.class,
                                                _parentId, accessMode);
        }


        Query qry = _db.getOQLQuery("SELECT p FROM "
                + PersistentObject.class.getName() + " p WHERE parentId=$1");
        qry.bind(_id);
        QueryResults res = qry.execute();
        while (res.hasMore()) {
            _children.addElement(res.next());
        }
        
        _origChildren = (Vector) _children.clone();

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        if (_parentId != null) {
            _parent = (PersistentEntity) _db.load(
                    PersistentEntity.class, _parentId, accessMode);
        }


        Query qry = _db.getOQLQuery("SELECT p FROM " + PersistentEntity.class.getName()
                + " p WHERE parentId=$1");
        qry.bind(_id);
        QueryResults res = qry.execute();
        while (res.hasMore()) { _children.addElement((PersistentEntity) res.next()); }
        _origChildren = new Vector < PersistentEntity > (_children);
        _origRelated = _related;
        return null;
    }

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    public Collection getProducts()
        throws PersistenceException
    {
        Query        qry;
        QueryResults res;


        if ( _products == null ) {
            _products = new ArrayList();
            qry = _db.getOQLQuery( "SELECT p FROM Product p WHERE p.category=$1" );
            qry.bind( _categoryId );
            res = qry.execute();
            while ( res.hasMore() )
                _products.add( res.next() );
        }
        return _products;
    }

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