login.java

是一个网上手机超市

package hall;
/**
 * Project:    NWPU online shop
 * JDK version used: jdk1.5.0
 * Version: 	1.01
 * class login 用来处理关于用户的登陆问题
 */

import java.sql.*;

public class login{
        private String username;	//登录用户名
        private String passwd;		//登录密码
        private DBWrapper myConnection = null;//数据库连接和操作
        private String sqlStr;
        public login() throws Exception{
                username = "";
                passwd = "";
                myConnection = DBWrapper.Instance();
                sqlStr = "";
        }
        public String getUsername() {
                return username;
        }
        public void setUsername(String newusername) {
                username = newusername;
        }
        public String getPasswd() {
                return passwd;
        }
        public void setPasswd(String newpasswd) {
                passwd = newpasswd;
        }
        
        /**
         * int excute()
         * 执行查询，1代表此用户名是管理员在使用的，2代表此用户名是顾客在使用的，3代表此用户名没有被使用
         * @return int 
         * @throws java.lang.Exception
         */
        public int excute() throws Exception {
                int flag = 3;//1 represents admin,2 represents customer,3 represents that the use isn't exsited
                sqlStr = "select * from administrators where username = '" +
                username + "' and password = '" +
                passwd + "'";
                ResultSet rs = myConnection.runQuery(sqlStr);
                
                if (rs.next()){
                        
                	flag = 1;
                }
                else{
                	sqlStr = "select * from customers where name = '" +
                    username + "' and password = '" +
                    passwd + "'";
                    rs = myConnection.runQuery(sqlStr);
                    if(rs.next()){
                    	flag = 2;
                    }
                    else{
                    	flag = 3;
                    }
                }
                rs.close();
                return flag;
        }
};