public Object throwQuery(String query, int callback) {
        try { 
            resultset   = statement.executeQuery(query);
            metadata    = resultset.getMetaData();
            
            switch(callback){
                case 0:
                    return true;
                case 1:
                    return repay();
                case 2:
                    print();
                    return true;
                default:
                    System.out.println("Error: callback codification not exists.");
                    return false;
            }
        } catch (SQLException ex) { System.out.println(errors.getError(102, ex)); }
        return false;
        /*
        *   Use example:
        *       db.throwQuery("SELECT * FROM table");
        *       db.throwQuery("CREATE TABLE table VALUES (?,?,?)", param1, param2, param3);
        */
    }