设计并实现一个多线程图书馆管理系统，涉及数据库操作

没有实现全部功能，希望路过的大佬，可以实现全部功能，在评论区聊聊

创建数据库library-demo

CREATE DATABASE `library-demo`

创建图书表book

CREATE TABLE `book` (
  `bookId` int(11) NOT NULL AUTO_INCREMENT COMMENT '图书ID',
  `bookName` varchar(15) DEFAULT NULL COMMENT '书名',
  `author` varchar(10) DEFAULT NULL COMMENT '作者',
  `publish` varchar(100) DEFAULT NULL COMMENT '出版社',
  `isbn` varchar(30) DEFAULT NULL COMMENT 'ISBN',
  `introduction` varchar(50) DEFAULT NULL COMMENT '简介',
  `language` varchar(10) DEFAULT NULL COMMENT '语言',
  `price` varchar(10) DEFAULT NULL COMMENT '价格',
  `bookStatus` tinyint(4) DEFAULT NULL COMMENT '图书状态',
  `bookImage` varchar(30) DEFAULT NULL COMMENT '封面',
  `bookCount` int(11) DEFAULT NULL COMMENT '存有量',
  `borrowDate` date DEFAULT NULL COMMENT '借阅日期',
  `returnDate` date DEFAULT NULL COMMENT '返还日期',
  `borrowTime` int(11) DEFAULT NULL COMMENT '借阅时长',
  PRIMARY KEY (`bookId`)
) ENGINE=InnoDB AUTO_INCREMENT=33 DEFAULT CHARSET=utf8 COMMENT='图书表';

创建用户表user

CREATE TABLE `user` (
  `userId` int(11) NOT NULL AUTO_INCREMENT COMMENT '用户ID',
  `userName` varchar(10) DEFAULT NULL COMMENT '用户名字',
  `password` varchar(10) DEFAULT NULL COMMENT '密码',
  `email` varchar(10) DEFAULT NULL COMMENT '邮箱',
  `phone` varchar(15) DEFAULT NULL COMMENT '电话',
  `address` varchar(20) DEFAULT NULL COMMENT '地址',
  PRIMARY KEY (`userId`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 COMMENT='用户表';

创建用户图书关联表bookuser

CREATE TABLE `bookuser` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '关系id',
  `book_id` int(11) DEFAULT NULL COMMENT '图书id',
  `user_id` int(11) DEFAULT NULL COMMENT '用户id',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户图书关系表';

创建借阅记录表borrowslog

CREATE TABLE `borrowslog` (
  `logId` int(11) NOT NULL AUTO_INCREMENT COMMENT '日志id',
  `borrowsFlag` varchar(10) DEFAULT NULL COMMENT '借阅标志',
  `bookId` varchar(10) DEFAULT NULL COMMENT '书籍Id',
  `userId` varchar(10) DEFAULT NULL COMMENT '用户Id',
  `borrowsDate` date DEFAULT NULL COMMENT '借阅日期',
  `returnFlag` varchar(10) DEFAULT NULL COMMENT '归还标志',
  `returnDate` date DEFAULT NULL COMMENT '归还日期',
  `borrowsTime` int(11) DEFAULT NULL COMMENT '借阅时长',
  `realityBorrowsTime` int(11) DEFAULT NULL COMMENT '实际借阅时长',
  `borrowNumber` varchar(20) DEFAULT NULL COMMENT '借阅单号',
  PRIMARY KEY (`logId`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT='借阅记录表';

到此数据库创建完成
下边是Demo的结构

book.java

package com.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

/**
 * @program: LibraryDemo
 * @description: 图书实体
 * @author: Casey Hu
 * @create: 2023-12-06 11:52
 **/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Book {

    private Integer BookId;

    private String BookName;

    private String Author;

    private String Publish;

    private String ISBN;

    private String Introduction;

    private String Language;

    private String Price;

    private Integer bookStatus;

    private String bookImage;

    private Integer bookCount;

    private Date borrowDate;

    private Date returnDate;

    private Integer borrowTime;
}

BorrowsLog.java

package com.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

/**
 * @program: LibraryDemo
 * @description:
 * @author: Casey Hu
 * @create: 2023-12-07 14:15
 **/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class BorrowsLog {
    private Integer logId;
    private String borrowsFlag;
    private String bookId;
    private String userId;
    private Date borrowsDate;
    private String returnFlag;
    private Date returnDate;
    private String borrowsTime;
    private String realityBorrowsTime;
    private String borrowNumber;

}

User.java

package com.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @program: LibraryDemo
 * @description: 用户
 * @author: Casey Hu
 * @create: 2023-12-06 14:17
 **/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {

    private Integer UserId;

    private String UserName;

    private String Password;

    private String Email;

    private String Phone;

    private String Address;

}

LibraryService.java

package com.service;

import com.domain.Book;
import com.domain.BorrowsLog;
import com.domain.User;
import com.util.JDBCUtil;

import java.sql.ResultSet;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * @program: LibraryDemo
 * @description:
 * @author: Casey Hu
 * @create: 2023-12-06 16:25
 **/

public class LibraryService {
    //添加图书
    public synchronized void addBook(Book book) {
        JDBCUtil jdbcUtil = new JDBCUtil();
        int i = jdbcUtil.executeUpdate("INSERT INTO book (bookName, author, publish, isbn, introduction, `language`, price, bookStatus, bookImage, bookCount)" +
                " VALUES('" + book.getBookName() + "', '" + book.getAuthor() + "', '" + book.getPublish() + "', '" + book.getISBN() + "', '" + book.getIntroduction() + "', '" + book.getLanguage() + "', '" + book.getPrice() + "', " + book.getBookStatus() + ", '" + book.getBookImage() + "', " + book.getBookCount() + ");");
        if (i==1) {
            System.out.println("插入成功");
        }else {
            System.out.println("插入失败");
        }
        jdbcUtil.closeConnection();
    }
    //删除图书
    public synchronized void deleteBook(Book book) {
        JDBCUtil jdbcUtil = new JDBCUtil();
        jdbcUtil.executeUpdate("update book set bookStatus = 0 where bookName = " + book.getBookName() + ";");
        jdbcUtil.closeConnection();
    }
    //搜索图书
    public synchronized List<Book> queryBookList(Book book) {
        List<Book> bookList =new ArrayList<>();
        JDBCUtil jdbcUtil = new JDBCUtil();
        ResultSet resultSet=jdbcUtil.executeQuery("select * from book where bookName = " + book.getBookName() + " and bookStatus = 1;");
        try {
            while (resultSet.next()) {
                Book bookRes=new Book();
                bookRes.setBookName(resultSet.getString("bookName"));
                bookRes.setAuthor(resultSet.getString("author"));
                bookRes.setPublish(resultSet.getString("publish"));
                bookRes.setISBN(resultSet.getString("isbn"));
                bookRes.setIntroduction(resultSet.getString("introduction"));
                bookRes.setLanguage(resultSet.getString("language"));
                bookRes.setPrice(resultSet.getString("price"));
                bookRes.setBookStatus(resultSet.getInt("bookStatus"));
                bookRes.setBookImage(resultSet.getString("bookImage"));
                bookRes.setBookCount(resultSet.getInt("bookCount"));
                bookRes.setBorrowDate(resultSet.getDate("borrowDate"));
                bookRes.setReturnDate(resultSet.getDate("returnDate"));
                bookRes.setBorrowTime(resultSet.getInt("borrowTime"));
                bookList.add(bookRes);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        jdbcUtil.closeConnection();
        return bookList;
    }

    public synchronized Book queryBook(Book book) {
        JDBCUtil jdbcUtil = new JDBCUtil();
        Book bookRes=new Book();
        ResultSet resultSet=jdbcUtil.executeQuery("select * from book where isbn = '" + book.getISBN() + "' and bookStatus = 1;");
        try {
            while (resultSet.next()) {
                bookRes.setBookName(resultSet.getString("bookName"));
                bookRes.setAuthor(resultSet.getString("author"));
                bookRes.setPublish(resultSet.getString("publish"));
                bookRes.setISBN(resultSet.getString("isbn"));
                bookRes.setIntroduction(resultSet.getString("introduction"));
                bookRes.setLanguage(resultSet.getString("language"));
                bookRes.setPrice(resultSet.getString("price"));
                bookRes.setBookStatus(resultSet.getInt("bookStatus"));
                bookRes.setBookImage(resultSet.getString("bookImage"));
                bookRes.setBookCount(resultSet.getInt("bookCount"));
                bookRes.setBorrowDate(resultSet.getDate("borrowDate"));
                bookRes.setReturnDate(resultSet.getDate("returnDate"));
                bookRes.setBorrowTime(resultSet.getInt("borrowTime"));
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        jdbcUtil.closeConnection();
        return bookRes;
    }

    //借阅图书
    public synchronized void borrowBook(Book book, User user,Integer days) {
        //根据图书ISBN查询 图书是否可以借阅，且查看库存量是否有，
        JDBCUtil jdbcUtil = new JDBCUtil();
        ResultSet resultSet = jdbcUtil.executeQuery("select bookStatus,bookCount,bookName,bookId from book where isbn='"+book.getISBN()+"' ;");
        Instant instant = Instant.now();
        long timestamp = instant.toEpochMilli();
        try {
            while (resultSet.next()) {
            Integer bookStatus = resultSet.getInt("bookStatus");
            if(bookStatus==1){
                Integer bookCount = resultSet.getInt("bookCount");
                if(bookCount>0){
                    //借阅 减少库存
                    int i = jdbcUtil.executeUpdate("update book set bookCount = bookCount - 1 where isbn='" + book.getISBN() + "' ;");
                    if(i==1){
                        //新增借阅日志
                        i = jdbcUtil.executeUpdate("INSERT INTO borrowslog (borrowsFlag, bookId, userId, borrowsDate,  borrowsTime, borrowNumber) " +
                                "VALUES('1', '" + resultSet.getInt("bookId") + "', '" + user.getUserId() + "', NOW(), '" + days + "', '" + timestamp + "');");
                        if(i==1){
                            System.out.println("借阅成功！借阅单号："+timestamp);
                        }else {
                            System.out.println("借阅异常，请联系管理员");
                        }
                    }
                }else {
                    System.out.println("此书 "+resultSet.getInt("bookName")+"库存不足");
                }
            }else {
                System.out.println("此书 "+resultSet.getInt("bookName")+"已下架");
            }
            }
        }catch (Exception e){
            System.out.println("查不到此书");
            e.printStackTrace();
        }
        jdbcUtil.closeConnection();
    }

    public synchronized void returnBook(String borrowNumber) {
        JDBCUtil jdbcUtil = new JDBCUtil();
        //通过借阅单号， 更新借阅标志和时间
        ResultSet resultSet = jdbcUtil.executeQuery("SELECT logId, borrowsFlag, bookId, userId, borrowsDate, returnFlag, returnDate, \n" +
                "borrowsTime, realityBorrowsTime, borrowNumber FROM borrowslog where borrowNumber='"+borrowNumber+"';");
        BorrowsLog borrowsLog = new BorrowsLog();
        try {
            while (resultSet.next()) {
                borrowsLog.setLogId(resultSet.getInt("logId"));
                borrowsLog.setUserId(resultSet.getString("userId"));
                borrowsLog.setBookId(resultSet.getString("bookId"));
                //计算实际时间
                Date  borrowsDate= resultSet.getDate("borrowsDate");
                long differenceInMilliseconds = new Date().getTime() - borrowsDate.getTime();
                // 转换毫秒差值为天数
                Integer differenceInDays = (int) TimeUnit.MILLISECONDS.toDays(differenceInMilliseconds);
                //更新
                jdbcUtil.executeUpdate("UPDATE borrowslog SET  returnFlag='1', returnDate=NOW(), realityBorrowsTime="+differenceInDays+" WHERE logId="+borrowsLog.getLogId()+" and borrowNumber='"+borrowNumber+"';");
                int i = jdbcUtil.executeUpdate("update book set bookCount = bookCount + 1 where bookId=" + borrowsLog.getBookId() + " ;");
                if(i==1){
                    System.out.println("此书归还成功");
                }
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        jdbcUtil.closeConnection();
    }




}

UserService.java(没有实现)

package com.service;

/**
 * @program: LibraryDemo
 * @description:
 * @author: Casey Hu
 * @create: 2023-12-06 16:49
 **/

public class UserService {
}

JDBCUtil.java

package com.util;

import javax.sql.DataSource;
import java.sql.*;

/**
 * @program: LibraryDemo
 * @description: JDBC工具类
 * @author: Casey Hu
 * @create: 2023-12-06 14:31
 **/

public class JDBCUtil {
    public static Connection connection;
    public static String url="jdbc:mysql://localhost:3306/library-demo?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai";

    public static String user="root";

    public static String password="123456";


    public static Connection getConnection(){
        try {
            connection = DriverManager.getConnection(url,user,password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return connection;
    }

    //执行查询
    public static ResultSet executeQuery(String sql) {
        System.out.println("执行SQL："+sql);
        Connection conn=getConnection();
        ResultSet resultSet=null;
        try {
            Statement stmt=conn.createStatement();
            resultSet=stmt.executeQuery(sql);
        }catch (Exception e){
            e.printStackTrace();
        }
        return resultSet;
    }

    // 执行更新操作（插入、更新、删除）
    public static int executeUpdate(String sql) {
        System.out.println("执行SQL："+sql);
        Connection conn = getConnection();
        int result = 0;
        try {
            // 开始事务
            conn.setAutoCommit(false);
            Statement statement = conn.createStatement();
            result = statement.executeUpdate(sql);
            conn.commit();
        } catch (SQLException e) {
            // 回滚事务
            if (conn != null) {
                try {
                    conn.rollback();
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }
            }
            e.printStackTrace();
        }
        return result;
    }


    // 关闭数据库连接
    public static void closeConnection() {
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}

StatementTest.java

package com.util;


import com.service.LibraryService;

import java.sql.*;

/**
 * @program: LibraryDemo
 * @description:
 * @author: Casey Hu
 * @create: 2023-12-06 14:45
 **/

public class StatementTest {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
//        //加载驱动
//        Class.forName("com.mysql.cj.jdbc.Driver");
//        //输入url、用户名、密码创建连接
//        //jdbc:mysql:是固定的写法，后面跟主机名localhost，3306是默认的MySQL端口号demo是数据库名称
//        //useUnicode=true是指是否使用Unicode字符集，赋值为true
//        //serverTimezone=UTC是指定时区时间为世界统一时间
//        //characterEncoding=utf-8是指定字符编码格式为UTF8
//        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/library-demo?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai", "root", "123456");
//        //sql查询语句
//        String sql = "select * from user";
//        Statement statement = connection.createStatement();
//        //执行查询语句
//        ResultSet resultSet = statement.executeQuery(sql);
//        //结果遍历
//        while (resultSet.next()) {
//            Object id = resultSet.getObject("userId");
//            Object name = resultSet.getObject("userName");
//            Object password = resultSet.getObject("password");
//            Object phone = resultSet.getObject("phone");
//            System.out.println(id + "-" + name + "-" + password + "-" + phone);
//        }
//        //关闭资源
//        resultSet.close();
//        statement.close();
//        connection.close();
//        JDBCUtil jdbcUtil = new JDBCUtil();
//        User user=new User();
//        user.setUserName("李四");
//        user.setPassword("123456");
//        user.setEmail("XXXXXXXXXX");
//        user.setPhone("1235586865");
//        jdbcUtil.executeUpdate("INSERT INTO `user` (userName, password, email, phone, address) " +
//                "VALUES('"+user.getUserName()+"', '"+user.getPassword()+"', '"+user.getEmail()+"', '"+user.getPhone()+"', '"+user.getAddress()+"');");
//        ResultSet resultSet = jdbcUtil.executeQuery("select * from user");
//        //结果遍历
//        while (resultSet.next()) {
//            Object id = resultSet.getObject("userId");
//            Object name = resultSet.getObject("userName");
//            Object password = resultSet.getObject("password");
//            Object phone = resultSet.getObject("phone");
//            System.out.println(id + "-" + name + "-" + password + "-" + phone);
//        }
//        jdbcUtil.closeConnection();
//        Book book=new Book();
//        book.setBookName("晚熟的人");
//        book.setAuthor("莫言");
//        book.setPrice("100");
//        book.setBookImage("1111111");
//        book.setIntroduction("《晚熟的人》是中国当代作家莫言创作的中短篇小说集");
//        book.setISBN("978-7020-164-776");
//        book.setBookStatus(1);
//        book.setBookCount(10);
        LibraryService libraryService=new LibraryService();
//        libraryService.addBook(book);
//        Book book1 = libraryService.queryBook(book);
//        System.out.println(book1.toString());
//        User user=new User();
//        user.setUserId(1);
        //借阅图书
//        libraryService.borrowBook(book1,user,30);
        //归还
        libraryService.returnBook("1701968793273");
    }
}

结束

写个总结吧，有的功能，比如登录，多线程的那部分没有实现，因为不会啊。我整体做完最后特别大的感受就是，对于持久层的框架是非常有必要的，如果没有mybatis，这样一点一点的封装是非常麻烦的