JDBC的配置与使用

package com.imooc.db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/** * */public class DBUtil {    private  final static String URL="jdbc:mysql://127.0.0.1:3306/imooc?useUnicode=true&characterEncoding=utf-8";    private final static String PASSWORD="1234";    private final static String USER="root";    public static void main(String[] args) throws ClassNotFoundException, SQLException {        //1.加载驱动        Class.forName("com.mysql.jdbc.Driver");        //2.获得数据库驱动        Connection con  =  DriverManager.getConnection(URL,USER,PASSWORD);        //3.通过数据库连接操纵数据库,实现增删该查        Statement stmt=con.createStatement();        ResultSet rs=stmt.executeQuery("select user_name,age from imooc_goddess");

while(rs.next()){            System.out.println(rs.getString("user_name")+","+rs.getInt("age"));        }

}}

刚开始遇到了Access denied for user ‘1234‘@‘localhost‘ (using password: YES)的问题，仔细一检查才发现密码和用户名写反了，改过来立马能运行了，要注意的是

Connection，Statement，ResultSet三个要导入的包是java.sql.*下的，而不是com.mysql.jdbc.*下的。