public void where(String classPath, ICriterion criterio){
        IQuery query = null;
        Objects<Person> object = null;
        
        try{
            dbc.openConnection();
            
            query = new CriteriaQuery(Class.forName(classPath),criterio);           
            object = dbc.odb.getObjects(query);
            
            while(object.hasNext()){
                Person p = object.next();
                System.out.println(p.getName() + " "+ p.getJob()+ " "+ p.getAge());
            }
            
         } catch (ClassNotFoundException e) {
            error.getError(101, e);
        } finally{
            dbc.closeConnection();
        }
    /* Examples:
     * In Main.class:
     *      DatabaseImplemantation db = new DatabaseImplementation();
     *      ICriterion criterio = null;
     * -------------------------------------------------------------------------
     * camp - int
     *      criterio = Where.equal("age", 25);
     *      db.where(DatabaseConstants.Person, criterio);
     * -------------------------------------------------------------------------
     * camp - String
     *      criterio = Where.equal("name", "Emilio");
     *      db.where(DatabaseConstants.Person, criterio);
     * -------------------------------------------------------------------------
     * logical expression AND
     *      criterio = new And().add(Where.equal("name","Roberto")).add(Where.equal("job", "Matemático"));
     *      db.where(DatabaseConstants.Person, criterio);
     * -------------------------------------------------------------------------
     * logical expression OR
     *      criterio = new Or().add(Where.equal("name","Emilio")).add(Where.equal("job", "Matemático"));
     *      db.where(DatabaseConstants.Person, criterio);
     * -------------------------------------------------------------------------
     * 
     * all clauses WHERE:
     * 
     * Where.equal
     * Where.like 
     * Where.gt 
     * Where.lt 
     * Where.le 
     * Where.isNull 
     * Where.isNotNull
     */
    }