My DbUtils Class based on Apache Commons DbUtils

import org.apache.commons.dbcp2.BasicDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.ArrayListHandler;
import javax.sql.DataSource;
import java.sql.*;
import java.util.List;

public class DbUtils {
// this class is my modification of Apache DbUtils

    private String driver;
    private String user;
    private String password;
    private String db;
    private String host;
    private String url;

    public DataSource ds;
    private QueryRunner qr;
    private ResultSetHandler<List<Object[]>> rsh = new ArrayListHandler();

    public DbUtils(String host, String db,
                   String driver, String user, String password) {
        this.driver = driver;
        this.user = user;
        this.password = password;
        this.db = db;
        this.host = host;
        this.url = host + db;
        ds = createDataSource();
        qr = new QueryRunner(ds);
    }

    private DataSource createDataSource() {
        BasicDataSource d = new BasicDataSource();
        d.setDriverClassName(driver);
        d.setUsername(user);
        d.setPassword(password);
        d.setUrl(url);
        return d;
    }

    public List<Object[]> select(String sql, Object... args) {
    // This function is used for selecting from database
        // It returns resultList - list of entries (rows). Each entry is an Object []
        // for example, if entry consists of id, username, product, then id is Object[0], username - Object[1], etc.
        // String sql is a query, e.g: "select id, username from mytable where id = ?"
        // args are values that replace ? in a query (just like PreparedStatement)
        List<Object[]> resultList = null;
        try {
            resultList = qr.query(sql, rsh, args);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return resultList;
    }

    public void printResultSet(List<Object[]> resultList) {
        // output this complicated List<Object[]>
        for (Object[] ob : resultList) {
            for (Object obj : ob) {
                System.out.print(obj);
                System.out.print(' ');
            }
            System.out.println();
        }
    }

    public int query(String sql, Object... args) {
        // result indicates, how manu rows affected by this operation
        // String sql is a query ( insert, update or delete )
        // args replace ? in String sql (just like PreparedStatement)
        int result = 0;
        try {
            result = qr.update(sql, args);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
}