jdbc实现图书馆借阅系统
前言
每位在学校学java的同学在期末会有java课程设计,而选题很可能就是图书管理系统,此篇文章可以帮助到你。能力有限,代码有bug可以下方的评论区指明
简介
图书馆管理系统分为用户登录和管理员登录,整个系统的控制是在控制台下进行操作的。
用户层
用户可以进行注册,登录,借书,查书,密码修改,还书等功能。
管理员层
管理员可以进行对管理书籍包括新书上架,修改库存信息等功能。
系统本身
系统本身可以根据用户是否逾期进行锁定禁止借书的功能等。
需要掌握的java知识
java基础语法,容器(list),jdbc,sql语句。
po层代码
/** * * 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; } } }
control层代码
/** * 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); } }
view层
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(){ } }
数据库
/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;
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