帮我用mysql+python写一个图书管理数据库系统

好的，这是一个比较复杂的项目，需要涉及到MySQL数据库的设计和Python编程。以下是一个简单的实现过程示例。

1. 数据库设计

首先，我们需要设计一个数据库，以存储图书信息和借阅记录。以下是一个简单的数据库设计：

- 图书表(Book)
- id: 图书编号
- title: 标题
- author: 作者
- publisher: 出版社
- pub_date: 出版日期
- price: 价格
- total: 总数量
- current: 当前数量
- 借阅记录表(Borrow)
- id: 记录编号
- book_id: 图书编号
- user_id: 用户编号
- borrow_date: 借阅日期
- return_date: 归还日期

2. Python程序实现

接下来，我们可以使用Python编写一个简单的程序，以与数据库交互。

首先，我们需要安装MySQL Python驱动程序。你可以使用以下命令：

pip install mysql-connector-python

然后，我们需要编写Python程序，以实现以下功能：

- 添加图书信息
- 修改图书信息
- 删除图书信息
- 查询图书信息
- 借阅图书
- 归还图书
- 查询借阅记录

以下是一个简单的Python程序示例：

import mysql.connector

# 连接数据库
db = mysql.connector.connect(
    host="localhost",
    user="yourusername",
    password="yourpassword",
    database="yourdatabase"
)

# 创建游标对象
cursor = db.cursor()

# 添加图书信息
def add_book(title, author, publisher, pub_date, price, total, current):
    sql = "INSERT INTO Book (title, author, publisher, pub_date, price, total, current) VALUES (%s, %s, %s, %s, %s, %s, %s)"
    val = (title, author, publisher, pub_date, price, total, current)
    cursor.execute(sql, val)
    db.commit()

# 修改图书信息
def update_book(id, title, author, publisher, pub_date, price, total, current):
    sql = "UPDATE Book SET title = %s, author = %s, publisher = %s, pub_date = %s, price = %s, total = %s, current = %s WHERE id = %s"
    val = (title, author, publisher, pub_date, price, total, current, id)
    cursor.execute(sql, val)
    db.commit()

# 删除图书信息
def delete_book(id):
    sql = "DELETE FROM Book WHERE id = %s"
    val = (id,)
    cursor.execute(sql, val)
    db.commit()

# 查询图书信息
def search_book(title=None, author=None, publisher=None, pub_date=None):
    sql = "SELECT * FROM Book WHERE 1=1"
    if title:
        sql += " AND title = %s"
        val = (title,)
    if author:
        sql += " AND author = %s"
        val = (author,)
    if publisher:
        sql += " AND publisher = %s"
        val = (publisher,)
    if pub_date:
        sql += " AND pub_date = %s"
        val = (pub_date,)
    cursor.execute(sql, val)
    result = cursor.fetchall()
    for row in result:
        print(row)

# 借阅图书
def borrow_book(book_id, user_id, borrow_date):
    sql = "INSERT INTO Borrow (book_id, user_id, borrow_date) VALUES (%s, %s, %s)"
    val = (book_id, user_id, borrow_date)
    cursor.execute(sql, val)
    db.commit()
    sql = "UPDATE Book SET current = current - 1 WHERE id = %s"
    val = (book_id,)
    cursor.execute(sql, val)
    db.commit()

# 归还图书
def return_book(id, return_date):
    sql = "UPDATE Borrow SET return_date = %s WHERE id = %s"
    val = (return_date, id)
    cursor.execute(sql, val)
    db.commit()
    sql = "SELECT book_id FROM Borrow WHERE id = %s"
    val = (id,)
    cursor.execute(sql, val)
    result = cursor.fetchone()
    book_id = result[0]
    sql = "UPDATE Book SET current = current + 1 WHERE id = %s"
    val = (book_id,)
    cursor.execute(sql, val)
    db.commit()

# 查询借阅记录
def search_borrow(user_id=None, book_id=None):
    sql = "SELECT * FROM Borrow WHERE 1=1"
    if user_id:
        sql += " AND user_id = %s"
        val = (user_id,)
    if book_id:
        sql += " AND book_id = %s"
        val = (book_id,)
    cursor.execute(sql, val)
    result = cursor.fetchall()
    for row in result:
        print(row)

# 测试代码
add_book("Python编程从入门到实践", "Eric Matthes", "人民邮电出版社", "2016-11-01", 98.0, 10, 10)
add_book("流浪地球", "刘慈欣", "重庆出版社", "2010-10-01", 42.0, 5, 5)
search_book(author="刘慈欣")
borrow_book(1, 1, "2021-01-01")
search_borrow()
return_book(1, "2021-01-10")
search_borrow()

以上代码是一个简单的图书管理系统示例，您可以根据自己的需求进行修改和扩展。