做一个图书管理系统java sqlserver

好的，下面是一个简单的图书管理系统的Java代码，使用的数据库是SQL Server。

首先，我们需要创建一个数据库，并在其中创建两个表：`book` 和 `borrow`。

CREATE DATABASE library;
USE library;

CREATE TABLE book (
    id INT PRIMARY KEY,
    title VARCHAR(50),
    author VARCHAR(50),
    publisher VARCHAR(50),
    publish_date DATE,
    price FLOAT,
    quantity INT
);

CREATE TABLE borrow (
    id INT PRIMARY KEY,
    book_id INT,
    user_id INT,
    borrow_date DATE,
    return_date DATE
);

然后，我们可以创建一个Java类 `Book` 来表示图书信息。

public class Book {
    private int id;
    private String title;
    private String author;
    private String publisher;
    private Date publishDate;
    private float price;
    private int quantity;

    // 构造器和 getter/setter 略
}

接下来，我们可以创建一个 `Library` 类来实现图书管理系统的功能。

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

public class Library {
    private Connection conn;

    public Library(String url, String username, String password) throws SQLException {
        conn = DriverManager.getConnection(url, username, password);
    }

    public List<Book> searchBooks(String keyword) throws SQLException {
        List<Book> books = new ArrayList<>();
        String sql = "SELECT * FROM book WHERE title LIKE ? OR author LIKE ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, "%" + keyword + "%");
        pstmt.setString(2, "%" + keyword + "%");
        ResultSet rs = pstmt.executeQuery();
        while (rs.next()) {
            Book book = new Book();
            book.setId(rs.getInt("id"));
            book.setTitle(rs.getString("title"));
            book.setAuthor(rs.getString("author"));
            book.setPublisher(rs.getString("publisher"));
            book.setPublishDate(rs.getDate("publish_date"));
            book.setPrice(rs.getFloat("price"));
            book.setQuantity(rs.getInt("quantity"));
            books.add(book);
        }
        return books;
    }

    public void borrowBook(int bookId, int userId, Date borrowDate, Date returnDate) throws SQLException {
        String sql = "INSERT INTO borrow (book_id, user_id, borrow_date, return_date) VALUES (?, ?, ?, ?)";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, bookId);
        pstmt.setInt(2, userId);
        pstmt.setDate(3, borrowDate);
        pstmt.setDate(4, returnDate);
        pstmt.executeUpdate();
        sql = "UPDATE book SET quantity = quantity - 1 WHERE id = ?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, bookId);
        pstmt.executeUpdate();
    }

    public void returnBook(int bookId, int userId) throws SQLException {
        String sql = "UPDATE borrow SET return_date = GETDATE() WHERE book_id = ? AND user_id = ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, bookId);
        pstmt.setInt(2, userId);
        pstmt.executeUpdate();
        sql = "UPDATE book SET quantity = quantity + 1 WHERE id = ?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, bookId);
        pstmt.executeUpdate();
    }

    public void close() throws SQLException {
        conn.close();
    }
}

在 `Library` 类中，我们实现了三个方法：

- `searchBooks()`：根据关键字搜索图书信息。
- `borrowBook()`：借阅图书并更新数据库中的数据。
- `returnBook()`：归还图书并更新数据库中的数据。

最后，我们可以编写一个主程序来测试图书管理系统。

import java.sql.*;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        String url = "jdbc:sqlserver://localhost:1433;databaseName=library";
        String username = "sa";
        String password = "123456";
        try (Library library = new Library(url, username, password)) {
            Scanner scanner = new Scanner(System.in);
            while (true) {
                System.out.println("请选择操作：");
                System.out.println("1. 搜索图书");
                System.out.println("2. 借阅图书");
                System.out.println("3. 归还图书");
                System.out.println("4. 退出");
                int choice = scanner.nextInt();
                switch (choice) {
                    case 1:
                        System.out.print("请输入关键字：");
                        String keyword = scanner.next();
                        List<Book> books = library.searchBooks(keyword);
                        for (Book book : books) {
                            System.out.println(book.getTitle() + "  " + book.getAuthor() + "  " + book.getQuantity());
                        }
                        break;
                    case 2:
                        System.out.print("请输入图书编号：");
                        int bookId = scanner.nextInt();
                        System.out.print("请输入用户编号：");
                        int userId = scanner.nextInt();
                        System.out.print("请输入借阅日期（yyyy-MM-dd）：");
                        String borrowDateStr = scanner.next();
                        Date borrowDate = Date.valueOf(borrowDateStr);
                        System.out.print("请输入归还日期（yyyy-MM-dd）：");
                        String returnDateStr = scanner.next();
                        Date returnDate = Date.valueOf(returnDateStr);
                        library.borrowBook(bookId, userId, borrowDate, returnDate);
                        System.out.println("借阅成功！");
                        break;
                    case 3:
                        System.out.print("请输入图书编号：");
                        bookId = scanner.nextInt();
                        System.out.print("请输入用户编号：");
                        userId = scanner.nextInt();
                        library.returnBook(bookId, userId);
                        System.out.println("归还成功！");
                        break;
                    case 4:
                        return;
                    default:
                        System.out.println("无效操作，请重新选择！");
                        break;
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

这样，我们就完成了一个简单的图书管理系统。当然，这只是一个示例，实际的系统需要考虑更多的功能和异常情况。