jdbc连接mariadb

package connectionsql;import java.sql.*;public class ConnectionSql {    String url;//="jdbc:mariadb://<IP>:<port>/<database>?user=<>&password=<>";    Connection conn;    org.mariadb.jdbc.Driver driver;    public ConnectionSql(String url,Connection conn,org.mariadb.jdbc.Driver driver){        this.url=url;        this.conn=conn;        this.driver=new org.mariadb.jdbc.Driver();    }    public Connection connectSql(){        try{            conn=DriverManager.getConnection(url);            System.out.println("连接成功");        }catch (SQLException e){            System.out.println("连接错误");            e.printStackTrace();        }        return conn;    }}