代码生成一个图书管理系统

好的，这里是一个简单的图书管理系统的代码示例，使用Python和SQLite数据库：

import sqlite3

# 连接数据库
conn = sqlite3.connect('library.db')
c = conn.cursor()

# 创建图书表
c.execute('''CREATE TABLE IF NOT EXISTS books
             (id INTEGER PRIMARY KEY AUTOINCREMENT,
              title TEXT,
              author TEXT,
              year INTEGER,
              isbn TEXT)''')

# 添加图书
def add_book(title, author, year, isbn):
    c.execute("INSERT INTO books (title, author, year, isbn) VALUES (?, ?, ?, ?)",
              (title, author, year, isbn))
    conn.commit()

# 更新图书
def update_book(id, title, author, year, isbn):
    c.execute("UPDATE books SET title=?, author=?, year=?, isbn=? WHERE id=?",
              (title, author, year, isbn, id))
    conn.commit()

# 删除图书
def delete_book(id):
    c.execute("DELETE FROM books WHERE id=?", (id,))
    conn.commit()

# 搜索图书
def search_book(title="", author="", year="", isbn=""):
    c.execute("SELECT * FROM books WHERE title=? OR author=? OR year=? OR isbn=?",
              (title, author, year, isbn))
    return c.fetchall()

# 显示所有图书
def view_all_books():
    c.execute("SELECT * FROM books")
    return c.fetchall()

# 关闭数据库连接
def close_db():
    conn.close()

这个简单的图书管理系统包含了添加图书、更新图书、删除图书、搜索图书、显示所有图书等功能。你可以根据自己的需求进行修改和调整。