登记、登录、查询功能

注册、登录、查询功能
参见附件：
1、DataConnector

   

package com.yuanzheng.database;public abstract class DataConstants {public static final String driver="com.mysql.jdbc.Driver";public static final String database_name="root";public static final String database_pwd="root";public static final String jdbc_url="jdbc:mysql://localhost:3306/yuanzheng";}