一,REGISTER
package JDBC;
import com.mysql.jdbc.Driver;
import java.sql.*;
/**
* Created by dllo on 17/6/1.
*/
public class jdbc2Register {
public static void main(String[] args) throws SQLException, ClassNotFoundException {
// 1 注册驱动
//驱动是分厂家的,
//有重复性的操作,
DriverManager.registerDriver(new Driver());
//类对象
//以下是推荐写法
//Class