JDBC连接mysql编程

package jdbc;

import java.sql.Statement;
import java.util.Scanner;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;

public class test {

    public static void main(String[] args) throws Exception {
         String url = "jdbc:mysql://localhost:3306/usedb" ;  //下面几行都是模板    
         String user = "root" ;   
         String password = "" ;
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn=DriverManager.getConnection(url, user, password);
        Statement stmt=conn.createStatement(); 


        String sql="select * from myuser";   //sql语句
        ResultSet re=stmt.executeQuery(sql); //传入sql语句获得结果集
        
  

        while(re.next()){  //next函数
            
            System.out.println(re.getString("name")); //得到特定字段对应的值
            String s1=re.getString(1); //得到第几个字段对应的值，不一定是String 类型
            String s2=re.getString(2);
            System.out.println(s1+"  "+s2);
            
        }
        sql="insert into myuser values(‘4‘,‘lihua‘,‘122222‘)"; //修改语句
        int i=stmt.executeUpdate(sql);//可实现添加删除修改,返回int值，代表影响几条记录
        if(i==1) System.out.println("添加成功");
        else System.out.println("添加失败");
        re.close();    
        stmt.close();   
        conn.close();
    }

}