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();    }}