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