Python使用UUID确保数据唯一性的实践指南

import uuid

uuid1 = uuid.uuid1()
print(f"UUID1: {uuid1}")

namespace = uuid.NAMESPACE_DNS
name = 'example.com'
uuid3 = uuid.uuid3(namespace, name)
print(f"UUID3: {uuid3}")

uuid4 = uuid.uuid4()
print(f"UUID4: {uuid4}")

namespace = uuid.NAMESPACE_DNS
name = 'example.com'
uuid5 = uuid.uuid5(namespace, name)
print(f"UUID5: {uuid5}")

uuid_example = uuid.uuid4()
print(f"UUID: {uuid_example}")
print(f"UUID的版本: {uuid_example.version}")
print(f"UUID的字段: {uuid_example.fields}")
print(f"UUID的整数表示: {uuid_example.int}")
print(f"UUID的字节表示: {uuid_example.bytes}")

import sqlite3

# 创建数据库连接和表
conn = sqlite3.connect(':memory:')
cursor = conn.cursor()
cursor.execute('''
CREATE TABLE users (
    id TEXT PRIMARY KEY,
    name TEXT
)
''')

# 插入数据
user_id = str(uuid.uuid4())
cursor.execute('INSERT INTO users (id, name) VALUES (?, ?)', (user_id, 'Alice'))
conn.commit()

# 查询数据
cursor.execute('SELECT * FROM users')
rows = cursor.fetchall()
print(rows)

# 关闭连接
conn.close()

import os

def save_file(content, directory='files'):
    if not os.path.exists(directory):
        os.makedirs(directory)
    file_name = f"{uuid.uuid4()}.txt"
    file_path = os.path.join(directory, file_name)
    with open(file_path, 'w') as file:
        file.write(content)
    print(f"文件已保存: {file_path}")

save_file("Hello, World!")

import flask
from flask import Flask, session

app = Flask(__name__)
app.secret_key = 'supersecretkey'

@app.route('/')
def index():
    if 'session_id' not in session:
        session['session_id'] = str(uuid.uuid4())
    return f"会话ID: {session['session_id']}"

if __name__ == "__main__":
    app.run(debug=True)

custom_namespace = uuid.UUID('12345678-1234-5678-1234-567812345678')
name = 'example'
uuid_custom = uuid.uuid5(custom_namespace, name)
print(f"自定义命名空间的UUID5: {uuid_custom}")

import uuid
import sqlite3
import os

def create_database():
    conn = sqlite3.connect(':memory:')
    cursor = conn.cursor()
    cursor.execute('''
    CREATE TABLE users (
        id TEXT PRIMARY KEY,
        name TEXT
    )
    ''')
    return conn, cursor

def add_user(cursor, name):
    user_id = str(uuid.uuid4())
    cursor.execute('INSERT INTO users (id, name) VALUES (?, ?)', (user_id, name))

def list_users(cursor):
    cursor.execute('SELECT * FROM users')
    rows = cursor.fetchall()
    for row in rows:
        print(row)

def save_file(content, directory='files'):
    if not os.path.exists(directory):
        os.makedirs(directory)
    file_name = f"{uuid.uuid4()}.txt"
    file_path = os.path.join(directory, file_name)
    with open(file_path, 'w') as file:
        file.write(content)
    print(f"文件已保存: {file_path}")

def main():
    # 数据库操作
    conn, cursor = create_database()
    add_user(cursor, 'Alice')
    add_user(cursor, 'Bob')
    list_users(cursor)
    conn.close()

    # 文件保存
    save_file("Hello, World!")

if __name__ == "__main__":
    main()