com.mysql.jdbc.Driver和org.gjt.mm.mysql.Driver区别

package com.dada.conn;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class TestMysql {

    public static void main(String[] args) throws Exception {
        //实际上两种加载驱动的方式都是一样的，最后（源码里面）都是调用的com.mysql.jdbc.Driver驱动
        //之所以还存在加载org.gjt.mm.mysql.Driver驱动，原因是为了向下兼容，其实这个类里面就只是
        //返回了一个对于com.mysql.jdbc.Driver一个引用而已
        // getConnByJdbcDriver();
        getConnByOrgDriver();
        PreparedStatement psmt = conn.prepareStatement("select * from student");
        ResultSet rs = psmt.executeQuery();
        while (rs.next()) {
            System.out.println("编号：" + rs.getInt(1) + "	" + "姓名："
                    + rs.getString(2));
        }
    }

    private static Connection conn;

    /**通过加载com.mysql.jdbc.Driver驱动类来获取连接
     * @throws Exception
     */
    public static void getConnByJdbcDriver() throws Exception {
        String url = "jdbc:mysql://localhost/dadasport?user=root&password=hdx&characterEncoding=utf-8";
        // 加载驱动
        Class clazz = Class.forName("com.mysql.jdbc.Driver");
        System.out.println("驱动名称" + clazz.getName());
        // 建立连接
        conn = DriverManager.getConnection(url);
    }

    /**通过加载org.gjt.mm.mysql.Driver驱动类来获取连接
     * @throws Exception
     */
    public static void getConnByOrgDriver() throws Exception {
        String url = "jdbc:mysql://localhost/dadasport?user=root&password=hdx&characterEncoding=utf-8";
        // 加载驱动
        Class clazz = Class.forName("org.gjt.mm.mysql.Driver");
        System.out.println("驱动名称" + clazz.getName());
        // 建立连接
        conn = DriverManager.getConnection(url);
    }


}