jdbc实现图书馆借阅系统

/**
 * 
 * 对数据库的操作进行单独处理，更多的逻辑更改在更高的逻辑层编写。降低耦合
 *
 */
public class libararydao {

  /**
   * 注册图书
   * @param user 注册图书信息
   * @return
   */
  public boolean addbook(bookinfo bookinfo){

    try {
      connection con =jdbcutil.creatconnection();
      string sql = "insert into bookinfo (bookname,zuozhe,shuliang,shengyushuliang,date)"
          + " values (?,?,?,?,?) ";
      preparedstatement pre =con.preparestatement(sql);
      pre.setstring(1, bookinfo.getbookname());
      pre.setstring(2, bookinfo.getzuozhe());
      pre.setint(3, bookinfo.getshuliang());
      pre.setint(4, bookinfo.getshuliang());
      pre.setdate(5, new java.sql.date(bookinfo.getdata().gettime()));
      pre.execute();

    } catch (sqlexception e) {
      system.out.println("图书注册失败");
      e.printstacktrace();
      return false;
    }
    return true;
  }

  /**
   * 注册账号
   * @param user 注册信息
   * @return
   */
  public boolean adduser(user user){

    try {
      connection con =jdbcutil.creatconnection();
      string sql = "insert into userinfo (username,password,books) values (?,?,0) ";
      preparedstatement pre =con.preparestatement(sql);
      pre.setstring(1, user.getusername());
      pre.setstring(2, user.getpassword());
      pre.execute();

    } catch (sqlexception e) {
      system.out.println("注册失败");
      e.printstacktrace();
      return false;
    }
    return true;
  }


  /**
   * 查询用户
   * @param user 信息
   * @return
   */
  public resultset queryuser(user user){

    try {
      connection con =jdbcutil.creatconnection();
      string sql = "select * from userinfo where username = ? ";
      preparedstatement pre;
      pre = con.preparestatement(sql);
      pre.setstring(1, user.getusername());
      resultset r =pre.executequery();
      return r;
    } catch (sqlexception e) {
      system.out.println("查询失败");
      e.printstacktrace();
      return null;
    }
  }


  /**
   * 更新持有书
   * @param user 信息
   * @return
   */
  public boolean updateuserbooks(user user){

    try {
      connection con =jdbcutil.creatconnection();
      string sql = "update userinfo set books = ? where username = ? ";
      preparedstatement pre;
      pre = con.preparestatement(sql);
      pre.setint(1, user.getbooks());
      pre.setstring(2, user.getusername());
      int r =pre.executeupdate();
      if(r>0){
        return true;
      }else{
        return false;
      }
    } catch (sqlexception e) {
      system.out.println("查询失败");
      e.printstacktrace();
      return false;
    }
  }

  /**
   * 借书表中插入
   * @param username 借书人
   * @param bookname 书名
   * @return
   */
  public boolean addborrowinfo(string username,string bookname){
    try {
      connection con =jdbcutil.creatconnection();
      string sql = "insert into borrowinfo (username,bookname,borrowdate,returndate)"
          + " values (?,?,?,?) ";
      preparedstatement pre;
      pre = con.preparestatement(sql);
      pre.setstring(1, username);
      pre.setstring(2, bookname);
      pre.setdate(3, new java.sql.date(new date().gettime()));
      pre.setdate(4, new java.sql.date(dateutil.addmonth(new date()).gettime()));
      pre.execute();

    } catch (sqlexception e) {
      system.out.println("借书失败");
      e.printstacktrace();
      return false;
    }
    return true;
  }

  /**
   * 查书
   * @param bookname 书名
   * @return
   */
  public resultset querybook(string bookname){
    try {
      connection con =jdbcutil.creatconnection();
      string sql = "select * from bookinfo where bookname ='"+bookname+"'";
      preparedstatement pre;
      pre = con.preparestatement(sql);
      resultset r =pre.executequery();
      return r;
    }
    catch (sqlexception e) {
      system.out.println("借书失败");
      e.printstacktrace();
      return null;
    }}
  /**
   * 查询所有的书籍
   * @return
   */
  public resultset queryallbook(){
    try {
      connection con =jdbcutil.creatconnection();
      string sql = "select * from bookinfo ";
      preparedstatement pre;
      pre = con.preparestatement(sql);
      resultset r =pre.executequery();
      return r;
    }
    catch (sqlexception e) {
      system.out.println("借书失败");
      e.printstacktrace();
      return null;
    }
  }
  /**
   * 分页 
   * @param page
   * @return
   */
    public resultset querysubbookinfo(int page){
      try {

        connection con =jdbcutil.creatconnection();
        preparedstatement pre;
        string sql = "select * from bookinfo limit ?,5 ";

        pre = con.preparestatement(sql);
        pre.setint(1, page);
        resultset r =pre.executequery();

        return r;
      }
      catch (sqlexception e) {
        system.out.println("借书失败");
        e.printstacktrace();
        return null;
      }


  }
  /**
   * 数据页数 五条数据为一组
   * @return
   */
  public int querypageinfo(){

    try {
      int zongshu = 0;
      connection con =jdbcutil.creatconnection();
      string sql1 = "select count(id) as cou from bookinfo ";

      statement sta =con.createstatement();
      resultset res =sta.executequery(sql1);
      if(res.next())
      {
        zongshu = res.getint("cou");
        if(zongshu == 0)return 0;
      }
      int a =0;
      if(zongshu%5==0){
        a = zongshu/5;
      }else{
        a = zongshu/5+1;
      }

      return a;
    }
    catch (sqlexception e) {
      system.out.println("借书失败");
      e.printstacktrace();
      return -1;
    }

  }


  /**
   * 更新剩余数量
   * @param bookname 书名
   * @param sysl 数量
   * @return
   */
  public boolean updatebookinfo(string bookname,int sysl){
    try {
      connection con =jdbcutil.creatconnection();

      string sql = "update bookinfo set shengyushuliang = ? where bookname = ?";
      preparedstatement pre;
      pre = con.preparestatement(sql);
      pre.setint(1,sysl);
      pre.setstring(2, bookname);

      int r =pre.executeupdate();

      if(r>0){
        return true;
      }else{
        return false;
      }
    } catch (sqlexception e) {
      system.out.println("借书失败");
      e.printstacktrace();
      return false;
    }
    }



    /*public boolean querybook(string...strings){
      try {
        connection con =jdbcutil.creatconnection();
        string sql = "select bookname from bookinfo where 1=1 ";

        preparedstatement pre;
        pre = con.preparestatement(sql);
        resultset r =pre.executequery();
        if(r.next()){
          return true;
        }else{
          return false;
        }
      } catch (sqlexception e) {
        system.out.println("借书失败");
        e.printstacktrace();
        return false;
      }*/
    /**
     * 查询用户的所有的借阅信息 
     * @param username
     * @return
     */
  public resultset queryborrowinfo(string username){

    try {
      connection con =jdbcutil.creatconnection();
      string sql = "select * from borrowinfo where username = '"+username+"'";
      preparedstatement pre = con.preparestatement(sql);
      resultset r =pre.executequery();
      return r;
    } catch (sqlexception e) {
      system.out.println("查询失败");
      e.printstacktrace();
      return null;
    }
  }
  /**
   * 查询借阅信息
   * @param username
   * @return
   */
  public resultset queryborrowinfo(string username,string bookname){

    try {
      connection con =jdbcutil.creatconnection();
      string sql = "select * from borrowinfo where username = ? and bookname = ?";
      preparedstatement pre = con.preparestatement(sql);
      pre.setstring(1, username);
      pre.setstring(2, bookname);
      resultset r =pre.executequery();
      return r;
    } catch (sqlexception e) {
      system.out.println("查询失败");
      e.printstacktrace();
      return null;
    }

  }
  /**
   * 删除借书
   * @param username 人名
   * @param bookname 书名
   * @return
   */
  public boolean deleteborrowinfo(string username,string bookname){

    try {
      connection con =jdbcutil.creatconnection();
      string sql = "delete from borrowinfo where username = ? and bookname = ? ";
      preparedstatement pre = con.preparestatement(sql);
      pre.setstring(1, username);
      pre.setstring(2, bookname);
      pre.execute();
      return true;
    } catch (sqlexception e) {
      system.out.println("查询失败");
      e.printstacktrace();
      return false;
    }
  }

}

/**
 * asdfasd 发斯蒂芬
 * 
 */

package library.controller;

import java.sql.resultset;
import java.sql.sqlexception;
import java.util.arraylist;
import java.util.list;
import java.util.scanner;

import library.dao.libararydao;
import library.po.bookinfo;
import library.po.borrowinfo;
import library.po.user;

public class bookcontroller {
  private static libararydao bookdao;
  private borrowinfo b;
  public bookcontroller() {
    if(bookdao == null) bookdao = new libararydao();
  }

  public static void main(string[] args) {
  //system.out.println(new bookcontroller().adduser(new user("123", "dvdf")));
      //system.out.println(new bookcontroller().borrowbook("123", new user("123", "dvdf")));
  // new bookcontroller().fenyeinfo(2);


  }

  /**
   * 用户登录
   * @param user 传过来的账号密码
   * @return 返回1为登陆成功 2为不存在 3异常
   */
  public int loginuser(user user){

    resultset rs =bookdao.queryuser(user);//验证用户是否存在
    try {
      if(rs!=null&&rs.next()){
        boolean b =rs.getstring("password").equals(user.getpassword());
        if(b){
          return 1;
        }
      }
      return 2;
    } catch (sqlexception e) {
      e.printstacktrace();
      return 3;
    }  

  }

  /**
   * 管理员登陆
   * @param user 传过来的账号密码
   * @return 返回1为登陆成功 2为不存在 3异常
   */
  public int loginguanli(user user){

    resultset rs =bookdao.queryuser(user);//验证管理员是否存在
    try {
      if(rs!=null&&rs.next()){
        boolean b =rs.getstring("password").equals(user.getpassword());
        int b1 = rs.getint("isguanli");//管理员标志位1
        if(b&&b1==1){
          return 1;
        }
      }return 2;
    } catch (sqlexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
      return 3;
    }  

  }
  /**
   * 查询书籍列表
   * @return 返回1为查询成功并已经输出 2为失败或其他
   */
  public int querybookinfo(){

    try {
      resultset r =bookdao.queryallbook();
      while(r!=null&&r.next()){
        system.out.println("书名"+r.getstring("bookname")+"作者"+
            r.getstring("zuozhe")+"总数"+r.getint("shuliang")+"剩余数量"+r.getint("shengyushuliang"));
      }
      if(r==null)return 2;
      return 1;
    } catch (sqlexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
      return 2;
    }



  }
  /**
   * 查询书籍数量和剩余数量
   * @return 返回1为查询成功并已经输出 2为失败或其他
   */
  public resultset querybookk(string bookname){

      resultset r =bookdao.querybook(bookname);
      return r;

  }
  /**
   * 查询书籍
   * @return 返回1为查询成功并已经输出 2为失败或其他
   */
  public int querybook(string bookname){
    try {
      resultset r =bookdao.querybook(bookname);
      while(r!=null&&r.next()){
        system.out.println("书名"+r.getstring("bookname")+"作者"+
            r.getstring("zuozhe")+"总数"+r.getint("shuliang")+"剩余数量"+r.getint("shengyushuliang"));
      }
      if(r==null)return 2;
      return 1;
    } catch (sqlexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
      return 2;
    }

  }

  /**
   * 加入新的图书信息
   * @param bookinfo 书籍的详细信息
   * @return 1成功 2失败
   */
  public int addbookinfo(bookinfo bookinfo){
    boolean b = bookdao.addbook(bookinfo);
    if(b)return 1;
    return 2;
  }




  /**
   * 注册用户
   * @param user
   * @return
   */
  public int adduser(user user){
    resultset rs =bookdao.queryuser(user);
    try {

      if(rs!=null&&!rs.next()){
        boolean b =bookdao.adduser(user);
        if(b)return 1; 
      }
    } catch (sqlexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
      return 3;
    }  
    return 2;
  }

  /**
   * 查询用户所有信息
   * @param user
   * @return
   */
  public int queryuser(user user){
    resultset r = bookdao.queryuser(user);
    try {
      if(r.next()){
        user.setbooks(r.getint("books"));
        system.out.println(user);
        return 1;
      }
        return 2;

    } catch (sqlexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
      return 2;
    }


  }


  /**
   * 借书 先检查书是否存在，再检查书籍是否有库存，然后检查是否已结借此书
   * 最后以上检查没有错误，就可以借书。 用户持有数量增加，借书信息详解录入，库存更新
   * 
   * 注意事项 
   * 1 resultset 默认指向数据前一个位置 必须 用 next 
   * 2 需要加入事务 防止出现错误造成数据表更新不一致
   * @param bookname 书名
   * @return
   */
  public string borrowbook(string bookname,user user){
    try {
      if(!bookdao.querybook(bookname).next()){
        return "借书失败-书籍不存在";}

      resultset querybookrs = bookdao.querybook(bookname);
      while(querybookrs.next()){
        int t = querybookrs.getint("shengyushuliang");
        if(t<1){return "库存不足";}

        resultset rs =bookdao.queryborrowinfo(user.getusername());

        if(rs!=null&&!rs.next()){


          //加入借阅详细信息
          boolean b1 =bookdao.addborrowinfo(user.getusername(), bookname);


          //更新借书数量
          resultset rs1 = bookdao.queryuser(user);
          rs1.next();
          user.setbooks(rs1.getint("books")+1);
          bookdao.updateuserbooks(user);


          //更新库存
          boolean b2 =bookdao.updatebookinfo(bookname, t-1);
          //system.out.println(b1+" "+b2);

          return b1?(b2?"借书成功":"借书失败"):("借书失败");

        }
       }

      return null;

    } catch (sqlexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
      return "借书失败-其他错误";
    }


  }
  /**还书
   * 更新用户持有数，归还书的库存，删除借书信息表中信息
   * @param user 更新数据数 
   * @param bookinfo 更新库存后的数
   * @return
   */
  public int returnbook(user user,string bookname){

    boolean b1 = bookdao.deleteborrowinfo(user.getusername(),bookname);
    boolean b2 = false;
    boolean b3 = false;
    try {
      //更新库存
      resultset r = bookdao.querybook(bookname);
      if(r.next()){
        int i = r.getint("shengyushuliang");
        b2 = bookdao.updatebookinfo(bookname,i+1);
      }

      //更新持有书数
      r = bookdao.queryuser(user);
      if(r.next()){
        int i = r.getint("books");
        user.setbooks(i-1);
        b3 =bookdao.updateuserbooks(user);
      }

      if(!b1||!b2||!b3){
        return 2;
      }
      return 1;
    } catch (sqlexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
      return 2;
    }

  }



  /**
   * 查询用户的借书情况
   * @param user 用户
   * @return 返回借阅信息
   */
  public list<borrowinfo> queryborrowinfo(user user){


    resultset r =  bookdao.queryborrowinfo(user.getusername());
    list<borrowinfo> l = new arraylist<borrowinfo>();
    try {
      while(r!=null&&r.next()){

        b = new borrowinfo();
        b.setusername(r.getstring("username"));
        b.setbookname(r.getstring("bookname"));
        b.setborrowdate(r.getdate("borrowdate"));
        b.setreturndate(r.getdate("returndate"));
        l.add(b);

      }
      return l;
    } catch (sqlexception e) {

      e.printstacktrace();
      return null;
    }
  }
  /**
   * 指定页码
   * @param age
   */
  public void fenyeinfo(int age){
    int i =bookdao.querypageinfo();
    system.out.println("总页数："+i);
    try {
      if(i>0){
        resultset r = bookdao.querysubbookinfo((age-1)*5);
        while(r!=null&&r.next()){
          system.out.println("书名"+r.getstring("bookname")+"作者"+
          r.getstring("zuozhe")+"总数"+r.getint("shuliang")+"剩余数量"+r.getint("shengyushuliang"));  
          }
      }  

    } catch (sqlexception e) {
      e.printstacktrace();
    }

  }
  /**
   * 指定上下页
   * @param age
   */
  public void fenyeinfo(string age){


  }

  /**
   * 更新图书信息
   * 更新作者，库存，剩余数量，不更新日期，书名（不就是添加了新的书籍了吗）
   * 可更新任务可以多选
   * 
   * 书名进行判断是否存在
   * 库存和剩余数量进行逻辑上的验证
   */
  public void updatebookinfo(string bookname){
    scanner scan = new scanner(system.in);

    system.out.println("更新作者输入:1，跳过11");
    int i =scan.nextint();
    list<list<string>> list = new arraylist<list<string>>();
    list<string> list1 = null;
    if(i==1){
      string newbookname = scan.next();
      list1 = new arraylist<string>();
      list1.add("zuozhe");
      list1.add("'"+newbookname+"'");
      list.add(list1);
    }
    //如果更新了库存，剩余数量也会跟着更新 需要判断库存逻辑的正确性
    system.out.println("更新数量输入2，跳过22");
    int ii = scan.nextint();
    if(ii==2){
      system.out.println("请更新库存数量");
      int newsum = scan.nextint();
      //判断数量逻辑的正确性
      resultset r = querybookk(bookname);
      int oldsum=0;int sykc=0;//旧库存和剩余数量
      try {
        while(r.next()){
          oldsum = r.getint("shuliang");
          sykc = r.getint("shengyushuliang");
        }
        if(newsum>oldsum){
          sykc+=newsum-oldsum;//记录更新后的剩余数量
          //system.out.println("根据已有库存，库存总量为---"+newsum);
        }
        else if(newsum<oldsum&&newsum>=sykc){//如何新的库存少于就库存。判断新库存与剩余数量的关系
          sykc-=newsum;
        }else{
          system.out.println("输入错误");
          return ;
        }



      } catch (sqlexception e) {
        // todo auto-generated catch block
        e.printstacktrace();
      }



      list1 = new arraylist<string>();
      list1.add("shuliang");
      list1.add(string.valueof(newsum));
      list.add(list1);
      list1 = new arraylist<string>();
      list1.add("shengyushuliang");
      list1.add(string.valueof(sykc));
      list.add(list1);
    }
    bookdao.updatebookinfo(list, bookname);
  }

}

package library.view;

import java.sql.resultset;
import java.sql.sqlexception;
import java.util.arraylist;
import java.util.date;
import java.util.inputmismatchexception;
import java.util.list;
import java.util.scanner;

import library.controller.bookcontroller;
import library.po.bookinfo;
import library.po.borrowinfo;
import library.po.user;

/**
 * 视图类，也是界面的显示层。程序运行的入口
 * 想说的话：
 * 如果使用web作为v层，只需要把bookrun方法拆开就可以了。对应会话跟踪，把 private static user user 存入session对象就可以了
 * 框架的话用springmvc 。对于dao加入orm框架（hibernate ，mybatis）。整合起来也就是常见的ssm体系或ssh体系
 * 数据库的选择更是随你心情。mysql sqlserver 等等。
 * 项目bug仔细看的话很多。本意想给入门的同学一个思路方向。对于一些变量的命名请不要学我（偷懒），养成一个良好的
 * 习惯。祝你在编程的道路上越走越远！！
 */
public class view {
  //controller 业务控制类
  private static bookcontroller bookc = new bookcontroller();
  //登陆后的用户跟踪类似session
  private static user user;
  //控制主界面的循环
  private static boolean flag = true;
  //接受控制台输入
  private static scanner scan = new scanner(system.in);

  public static void main(string[] args) {
   bookrun();
  }



  //主界面  应该考虑其他输入的限定 （当输入字符时，系统停止运行）
  public static void bookrun(){
      try{
        do{
          system.out.println("欢迎来到图书借阅系统\n登陆输入: 1\n注册输入: 2\n管理员管理:3");
          int i1 = scan.nextint();

          switch (i1) {
          case 1://登陆逻辑
            system.out.println("输入账号");
            string username = scan.next();
            system.out.println("密码");
            string password = scan.next();

            int i =bookc.loginuser(new user(username, password));

            if(i==1){

              system.out.println("登陆成功");
              user = new user(username, password);
              loginsuccess(user);

            }else if(i!=1){
              system.out.println("登陆失败，检查密码或者账号");
              }
            break;

          case 2:
            //注册逻辑 可以添加验证密码 进行密码的确定  java api有把明文进行处理的方法，请自行搜索
            //还可以加入正则表达式进行账号的限定（对于特殊字符输入的处理等）
            system.out.println("输入申请账号");
            string username1 = scan.next();
            system.out.println("密码");
            string password1 = scan.next();
            //此处可以再次确认密码的逻辑
            system.out.println(adduser(new user(username1, password1)));
            system.out.println("返回上一层");

            break;

          case 3://管理员逻辑
            system.out.println("输入管理员账号");
            string username2 = scan.next();
            system.out.println("密码");
            string password2 = scan.next();
            user = new user(username2, password2);
            int i2 =bookc.loginguanli(user);
            if(i2==1){
              loginguanlisuccess();
            }else{
              system.out.println("登陆失败，检查密码或者账号");
            }

            break;

          default :
            system.out.println("输入序号不正确");
            break;
          }

        }while(flag);


      }catch(inputmismatchexception e){
        system.out.println("输入异常，请重启系统");
      }


  }

  //此处可以添加新的功能而不影响已有功能 （可以改为switch语句）
  private static void loginguanlisuccess() {
    while(true){
      system.out.println("添加图书：1\n更改图书信息：2\n返回：3");
      int i = scan.nextint();
      if(i==1){
        addbook();
      }else if(i==2){
        updatebookinfo();
      }else if(i==3){
        return;
      }
    }

  }

//更新图书
/**
 * 更新图书 只有管理员权限可以操作
 */
  private static void updatebookinfo() {



    //应该判断书名是否存在 contro层设计
    system.out.println("请输入书名");
    string bookname = scan.next();
    int a = bookc.querybook(bookname);
    if(a!=1){
      system.out.println("不存在，已返回上一层");
      return;
    }

/*   system.out.println("更新作者输入1，跳过11");
    int i =scan.nextint();
    list<list<string>> list = new arraylist<list<string>>();
    list<string> list1 = null;
    if(i==1){
      string newbookname = scan.next();
      list1 = new arraylist<string>();
      list1.add("zuozhe");
      list1.add("'"+newbookname+"'");
      list.add(list1);
    }
    //如果更新了库存，剩余数量也会跟着更新 需要判断库存逻辑的正确性
    system.out.println("更新数量输入2，跳过22");
    int ii = scan.nextint();
    if(ii==2){
      //判断数量逻辑的正确性
      resultset r =bookc.querybookk(bookname);
      try {
        int i1=0;int i2=0;
        while(r.next()){
          i1 = r.getint("shuliang");
          i2 = r.getint("shengyushuliang");
        }
        if(ii>i1){
          i2+=ii-i1;
        }
        if(ii<i1&&ii>=i2){

        }
        system.out.println("更新后的数量错误");
        return;



      } catch (sqlexception e) {
        // todo auto-generated catch block
        e.printstacktrace();
      }




      string newkucun= scan.next();
      list1 = new arraylist<string>();
      list1.add("shuliang");
      list1.add(newkucun);
      list.add(list1);
    }*/

    bookc.updatebookinfo(bookname);
  }


//添加图书 需要保证名字唯一性
  private static void addbook() {
    system.out.println("图名");
    string bookname = scan.next();
    system.out.println("作者");
    string zuozhe = scan.next();
    system.out.println("数量");
    int  shuliang = scan.nextint();
    bookinfo bookinfo = new bookinfo(bookname, zuozhe, shuliang, shuliang,new date());
    int i =bookc.addbookinfo(bookinfo);
    if(i==1){
      system.out.println("添加成功");

    }else{
      system.out.println("错误");
    }

  }

  //注册界面的实现
  private static string adduser(user user){
    switch (bookc.adduser(user)) {
    case 1:
      return "注册成功";

    case 2:
      return "用户已注册";

    case 3:
      return "其他错误，重试";
    }

    return "其他错误，重试";

  }
  //登陆功能实现
  private static void loginsuccess(user user ){
    while (true){
      system.out.println("查看借阅信息请输入：1，借书：2，还书：3，账号信息：4,退出：5"
          + "查询图书：6修改密码：7\n");
      int i = scan.nextint();
      switch (i) {
      case 1:
        borrowinfo(user);
        break;
      case 2:
        borrowbook(user);
        break;
      case 3:
        returnbook(user);
        break;
      case 4:
        queryuser(user);
        break;
      case 5:
        return ;
      case 6:
        system.out.println("请输入书名");

        querybook(scan.next());
        break;
      case 7: break;
      default:
        system.out.println("输入错误");
        break;
      }
    }


  }
  //查询借阅信息
  private static void borrowinfo(user user ){
    list<borrowinfo> l=bookc.queryborrowinfo(user);
    if(l==null||l.isempty()){
      system.out.println("没有借阅信息");
      return;
    }
    for (borrowinfo borrowinfo : l) {
      system.out.println(borrowinfo);
    }

  }
  //借书
  private static void borrowbook(user user){
    system.out.println("请输入借阅的书籍名称");
    string bookname =scan.next();
    string flog = bookc.borrowbook(bookname, user);
    system.out.println(flog);
    system.out.println("是否继续借书：y|n");
    string flog1 = scan.next();
    if(flog1.equalsignorecase("y")){
      borrowbook(user);
    }
  }
  //还书
  private static void returnbook(user user1 ){
    list<borrowinfo> l=bookc.queryborrowinfo(user1);
    if(l==null||l.isempty()){
      system.out.println("没有借阅信息");
      return;
    }
    for (borrowinfo borrowinfo : l) {
      system.out.println(borrowinfo);
    }
    system.out.println("请输入要还书籍的名字");
    string bookname = scan.next();
    int flog =bookc.returnbook(user1, bookname);
    if(flog==1){
      system.out.println("还书成功");
    }else{
      system.out.println("失败");
    }
    system.out.println("是否继续还书：y|n");
    string flog1 = scan.next();
    if(flog1.equalsignorecase("y")){
      returnbook(user1);
    }  

  }
  //用户信息
  private static void queryuser(user user){
    int i =bookc.queryuser(user);
    if( i!=1){
      system.out.println("失败");
    }
  }

  private static void querybook(string bookname){
    int i = bookc.querybook(bookname);
    if(i!=1)system.out.println("书籍不存在");
  }

  private static void guanliface(){
    while(true){
      system.out.println("查询书籍列表请输入 ：1；添加图书：2；使用分页查看书籍列表");
      int i =scan.nextint();
      switch (i) {
      case 1:
        int i1= bookc.querybookinfo();
        if(i1==2)system.out.println("错误");
        break;
      case 2:
        system.out.println("书名");
        string booknname1 = scan.next();
        system.out.println("作者");
        string zuozhe1 = scan.next();
        system.out.println("数量");
        int shuliang1 = scan.nextint();
        date date = new date();
        int i3 = bookc.addbookinfo(new bookinfo(booknname1, zuozhe1, shuliang1, shuliang1, date));
        if(i3==2)system.out.println("错误");
        break;
      case 3:
      default:
        system.out.println("错");
        break;
      }
    }

  }

  private static void fenyeinfo(){

  }


}

/用户表
create table `userinfo` (
 `id` int(10) not null auto_increment,
 `username` varchar(20) collate utf8_bin default null,
 `password` varchar(20) collate utf8_bin default null,
 `books` int(10) default null,
 `isguanli` int(10) not null default '0',
 primary key (`id`)
) engine=innodb auto_increment=21 default charset=utf8 collate=utf8_bin;


/借书信息
create table `borrowinfo` (
 `id` int(10) not null auto_increment,
 `username` varchar(20) collate utf8_unicode_ci default null,
 `bookname` varchar(20) collate utf8_unicode_ci default null,
 `borrowdate` date default null,
 `returndate` date default null,
 primary key (`id`)
) engine=innodb auto_increment=9 default charset=utf8 collate=utf8_unicode_ci;

/书籍信息 字段用的拼音:-d
create table `bookinfo` (
 `id` int(10) not null auto_increment,
 `bookname` varchar(20) collate utf8_unicode_ci not null,
 `zuozhe` varchar(20) collate utf8_unicode_ci default null,
 `shuliang` varchar(20) collate utf8_unicode_ci default null,
 `shengyushuliang` varchar(20) collate utf8_unicode_ci default null,
 `date` date default null,
 primary key (`id`)
) engine=innodb auto_increment=13 default charset=utf8 collate=utf8_unicode_ci;