读者账号的连接数据库操作，登录验证，注册，修改账号，修改密码

package com.rain.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import com.rain.bean.AdminBean;
import com.rain.bean.BookBean;
import com.rain.util.DBUtil;
/**
 * 有关读者账号的连接数据库操作，登录验证，注册，修改账号，修改密码
 */
public class AdminDao {
   
   /**
    * 登录验证功能，传入用户名和密码，在数据库中查找，如果找到了，返回true，没找到则返回false
    * @param username
    * @param password
    * @return
    */
   public boolean Login_verify(String username,String password){
      Connection conn = DBUtil.getConnectDb();
      String sql = "select * from admin where username='"+username+"' and password='"+password+"'";
      PreparedStatement stm = null;
      ResultSet rs = null;
      try {
         stm = conn.prepareStatement(sql);
         rs = stm.executeQuery();
         if(rs.next()){
            return true;
         }
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }finally{
         DBUtil.CloseDB(rs, stm, conn);
      }
      return false;
   }
   /**
    * 注册账号的函数，传入账号，密码，姓名，邮箱，手机号，借阅天数，可借阅数
    * @param username
    * @param password
    * @param name
    * @param email
    * @param phone
    * @param lend_num
    * @param max_num
    */
   public void Register(String username, String password, String name, String email, String phone,int lend_num,int max_num) {
      // TODO Auto-generated method stub
            Connection conn = DBUtil.getConnectDb();
            String sql = "insert  into admin(status,username,password,name,email,phone,lend_num,max_num) values(?,?,?,?,?,?,?,?)";
            int rs = 0;
            PreparedStatement stm = null;
            try {
               stm = conn.prepareStatement(sql);
               stm.setInt(1, 1);
               stm.setString(2, username);
               stm.setString(3, password);
               stm.setString(4, name);
               stm.setString(5, email);
               stm.setString(6, phone);
               stm.setInt(7, lend_num);
               stm.setInt(8, max_num);
               rs = stm.executeUpdate();
            } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
            }
   }
   /**
    * 根据传入的账号，密码，来查找对应的读者信息，返回一个AdminBean类型，
    * @param username
    * @param password
    * @return
    */
   public AdminBean getAdminInfo(String username, String password) {
      // TODO Auto-generated method stub
      AdminBean adminbean = new AdminBean();
      Connection conn = DBUtil.getConnectDb();
      String sql = "select * from admin where username='"+username+"' and password='"+password+"'";
      PreparedStatement stm = null;
      ResultSet rs = null;
      try {
         stm = conn.prepareStatement(sql);
//       stm.setString(1,name);
         rs = stm.executeQuery();
         if(rs.next()){
            adminbean.setAid(rs.getInt("aid"));
            adminbean.setUsername(rs.getString("username"));
            adminbean.setName(rs.getString("name"));
            adminbean.setPassword(rs.getString("password"));
            adminbean.setEmail(rs.getString("email"));
            adminbean.setPhone(rs.getString("phone"));
            adminbean.setStatus(rs.getInt("status"));
            adminbean.setLend_num(rs.getInt("lend_num"));
            adminbean.setMax_num(rs.getInt("max_num"));
         }
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }finally{
         DBUtil.CloseDB(rs, stm, conn);
      }
      return adminbean;
   }
   /**
    * 获取全部用户的信息，其中sql语句中的status=1，表示只查找读者，不显示管理员的
    * @return
    */
   public ArrayList<AdminBean> get_ListInfo(){
      ArrayList<AdminBean> tag_Array = new ArrayList<AdminBean>();
      Connection conn = DBUtil.getConnectDb();
      String sql = "select * from admin where status=1";
      PreparedStatement stm = null;
      ResultSet rs = null;
      try {
         stm = conn.prepareStatement(sql);
         rs = stm.executeQuery();
         while(rs.next()){
            AdminBean adminbean = new AdminBean();
            adminbean.setAid(rs.getInt("aid"));
            adminbean.setUsername(rs.getString("username"));
            adminbean.setName(rs.getString("name"));
            adminbean.setPassword(rs.getString("password"));
            adminbean.setEmail(rs.getString("email"));
            adminbean.setPhone(rs.getString("phone"));
            adminbean.setStatus(rs.getInt("status"));
            adminbean.setLend_num(rs.getInt("lend_num"));
            adminbean.setMax_num(rs.getInt("max_num"));
            tag_Array.add(adminbean);
         }
         
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }finally{
         DBUtil.CloseDB(rs, stm, conn);
      }
      return tag_Array;
   }
   /**
    * 根据传入的aid，查找到对应的读者的全部信息，返回一个AdminBean类型的数据
    * @param aid
    * @return
    */
   public AdminBean get_AidInfo(int aid){
      AdminBean adminbean = new AdminBean();
      Connection conn = DBUtil.getConnectDb();
      String sql = "select * from admin where aid="+aid;
      PreparedStatement stm = null;
      ResultSet rs = null;
      try {
         stm = conn.prepareStatement(sql);
         rs = stm.executeQuery();
         if(rs.next()){
            adminbean.setAid(rs.getInt("aid"));
            adminbean.setUsername(rs.getString("username"));
            adminbean.setName(rs.getString("name"));
            adminbean.setPassword(rs.getString("password"));
            adminbean.setEmail(rs.getString("email"));
            adminbean.setPhone(rs.getString("phone"));
            adminbean.setStatus(rs.getInt("status"));
            adminbean.setLend_num(rs.getInt("lend_num"));
            adminbean.setMax_num(rs.getInt("max_num"));
         }
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }finally{
         DBUtil.CloseDB(rs, stm, conn);
      }
      return adminbean;
   }
   /**
    * 根据传入的aid，查找到对应的读者的全部信息，返回一个AdminBean类型的数据，与上一个相似，只是aid的类型为String，
    * @param aid
    * @return
    */
   public AdminBean get_AidInfo2(String aid){
      AdminBean adminbean = new AdminBean();
      Connection conn = DBUtil.getConnectDb();
      String sql = "select * from admin where aid="+aid;
      PreparedStatement stm = null;
      ResultSet rs = null;
      try {
         stm = conn.prepareStatement(sql);
         rs = stm.executeQuery();
         if(rs.next()){
            adminbean.setAid(rs.getInt("aid"));
            adminbean.setUsername(rs.getString("username"));
            adminbean.setName(rs.getString("name"));
            adminbean.setPassword(rs.getString("password"));
            adminbean.setEmail(rs.getString("email"));
            adminbean.setPhone(rs.getString("phone"));
            adminbean.setStatus(rs.getInt("status"));
            adminbean.setLend_num(rs.getInt("lend_num"));
            adminbean.setMax_num(rs.getInt("max_num"));
         }
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }finally{
         DBUtil.CloseDB(rs, stm, conn);
      }
      return adminbean;
   }
   /**
    * 修改读者的信息，
    */
   public void updateUser(int aid, String username, String password, String name, String email, String phone,
         int lend_num, int max_num) {
      // TODO Auto-generated method stub
      Connection conn = DBUtil.getConnectDb();
      String sql = "update admin set username=?,name=?,email=?,phone=?,password=?,lend_num=?,max_num=? where aid=?";
      PreparedStatement stm = null;
      try {
         stm = conn.prepareStatement(sql);
         stm.setString(1, username);
         stm.setString(2, name);
         stm.setString(3, email);
         stm.setString(4, phone);
         stm.setString(5, password);
         stm.setInt(6, lend_num);
         stm.setInt(7, max_num);
         stm.setInt(8, aid);
         stm.executeUpdate();
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
   /**
    * 删除用户的信息，根据传入的aid作为条件
    * @param aid
    */
   public void deleteUser(int aid) {
      // TODO Auto-generated method stub
            Connection conn = DBUtil.getConnectDb();
            String sql = "delete from admin where aid=?";
            PreparedStatement stm = null;
            try {
               stm = conn.prepareStatement(sql);
               stm.setInt(1, aid);
               stm.executeUpdate();
            } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
            }  
   }
}