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【一周精选】Python 秒杀系统实战:库存预扣 + 防超卖

  • 2026-06-29 12:00:47
【一周精选】Python 秒杀系统实战:库存预扣 + 防超卖

极致优化实现

秒杀场景的核心痛点:高并发击穿数据库、超卖、库存不一致、重复下单、恶意刷接口。

本方案采用 Redis 库存预扣(异步削峰)+ Lua 原子操作(防超卖核心)+ 分布式锁 + 数据库乐观锁 + 消息队列异步下单 三重防超卖机制,完全贴合生产级业务。

技术栈

FastAPI(高并发接口)+ Redis(redis-py)+ redlock-py(分布式锁)+ pika(RabbitMQ客户端)+ MySQL(PyMySQL/SQLAlchemy)+ Lua(Redis原子操作)

> 核心优化:Redis 扛所有并发读写,MySQL 只做最终数据落地,彻底解决高并发下DB性能瓶颈。

一、数据库设计(防超卖兜底)

设计两张核心表,乐观锁作为防超卖最后一道防线,SQL语句与Java版本一致,直接执行即可:

1. 秒杀商品表(存储真实库存)

CREATETABLE`seckill_goods` (`id`bigintNOTNULL AUTO_INCREMENT COMMENT'主键',`goods_id`bigintNOTNULLCOMMENT'商品ID',`stock_count`intNOTNULLDEFAULT'0'COMMENT'真实库存',`seckill_price`decimal(10,2NOTNULLCOMMENT'秒杀价格',`version`intNOTNULLDEFAULT'0'COMMENT'乐观锁版本号',  PRIMARY KEY (`id`),UNIQUEKEY`uk_goods_id` (`goods_id`)ENGINE=InnoDBDEFAULTCHARSET=utf8mb4 COMMENT='秒杀商品表';

2. 秒杀订单表

CREATETABLE`seckill_order` (`id`bigintNOTNULL AUTO_INCREMENT COMMENT'主键',`user_id`bigintNOTNULLCOMMENT'用户ID',`goods_id`bigintNOTNULLCOMMENT'商品ID',`order_id`bigintNOTNULLCOMMENT'订单ID',`status`tinyintNOTNULLDEFAULT'0'COMMENT'订单状态:0待支付 1已支付 2已取消',`create_time` datetime DEFAULTCURRENT_TIMESTAMP,  PRIMARY KEY (`id`),UNIQUEKEY`uk_user_goods` (`user_id`,`goods_id`COMMENT'唯一索引:一人一单'ENGINE=InnoDBDEFAULTCHARSET=utf8mb4 COMMENT='秒杀订单表';

✅ 业务细节:`user_id + goods_id` 唯一索引 → 强制一人一单,防止重复下单。

二、Redis 核心设计(库存预扣 + 高并发支撑)

1. Redis Key 规范(Python常量定义)

# seckill_redis_key.pyclassSeckillRedisKey:# 秒杀库存预扣 Key (核心:存储预扣库存)    SECKILL_STOCK = "seckill:stock:%s"# 秒杀用户锁 (一人一单)    SECKILL_USER_LOCK = "seckill:user:lock:%s:%s"# 秒杀商品锁 (防止并发扣库存)    SECKILL_GOODS_LOCK = "seckill:goods:lock:%s"

2. 库存缓存预热(秒杀前必做)

禁止直接查MySQL库存!秒杀开始前,将库存加载到Redis,使用异步任务(Celery)执行预热:

# seckill_preheat_service.pyimport redisfrom sqlalchemy.orm import Sessionfrom seckill_redis_key import SeckillRedisKeyfrom models.seckill_goods import SeckillGoodsfrom celery import Celery# Redis 连接配置(实际项目建议放在配置文件)redis_client = redis.Redis(host="127.0.0.1", port=6379, db=0, decode_responses=True)# Celery 配置(异步任务)celery_app = Celery("seckill_preheat",    broker="amqp://guest:guest@localhost:5672//",    backend="redis://127.0.0.1:6379/1")classSeckillPreheatService:    @staticmethod    @celery_app.taskdefpreheat_seckill_stock(goods_id: int, db: Session):"""        秒杀库存预热:将MySQL库存同步到Redis        执行时机:秒杀开始前5分钟(定时任务/后台手动触发)        """# 查询MySQL中的秒杀商品库存        seckill_goods = db.query(SeckillGoods).filter(SeckillGoods.goods_id == goods_id).first()ifnot seckill_goods or seckill_goods.stock_count<= 0:raise Exception("商品不存在或无库存")# 拼接Redis Key,覆盖写入库存(保证缓存与DB一致)        stock_key = SeckillRedisKey.SECKILL_STOCK % goods_id        redis_client.set(stock_key, str(seckill_goods.stock_count))

✅ 优化点:异步预热,不阻塞主线程;秒杀前预热,避免缓存击穿

三、核心:Redis 库存预扣 + 原子防超卖(Lua脚本)

🔥 关键原理

Redis 单命令是原子的,但 判断库存 + 扣减库存 是两个命令,高并发下会超卖!

解决方案:用 Lua 脚本 把两个操作封装为原子操作,这是秒杀防超卖的核心

1. 编写 Lua 脚本(seckill_stock.lua)

-- 1. 获取参数(Redis Key)local stockKey = KEYS[1]-- 2. 获取当前库存local stock = tonumber(redis.call('get', stockKey))-- 3. 判断库存(库存不存在或不足,返回-1)if stock == nilor stock <= 0thenreturn-1end-- 4. 原子扣减库存(预扣,Redis自减1)redis.call('decr', stockKey)-- 5. 预扣成功,返回0return0

2. Python 执行 Lua 脚本(核心预扣逻辑)

# seckill_stock_service.pyimport redisfrom seckill_redis_key import SeckillRedisKey# 复用Redis连接redis_client = redis.Redis(host="127.0.0.1", port=6379, db=0, decode_responses=True)classSeckillStockService:    @staticmethoddefload_lua_script() -> str:"""加载Lua脚本(读取本地文件)"""with open("seckill_stock.lua""r", encoding="utf-8"as f:return f.read()    @staticmethoddefpre_deduct_stock(goods_id: int) -> int:"""        Redis 库存预扣(原子操作,防超卖)        :return: 0:预扣成功  -1:库存不足        """        stock_key = SeckillRedisKey.SECKILL_STOCK % goods_id        lua_script = SeckillStockService.load_lua_script()# 执行Lua脚本,KEYS参数为[stock_key],ARGV无额外参数        result = redis_client.eval(lua_script, 1, stock_key)return int(result)    @staticmethoddefrollback_stock(goods_id: int) -> None:"""        库存回滚(订单超时未支付、扣减失败时调用)        Redis库存自增1,恢复预扣的库存        """        stock_key = SeckillRedisKey.SECKILL_STOCK % goods_id        redis_client.incr(stock_key)

✅ 优化点

  • **原子性**:Lua脚本保证判断+扣减一步完成,绝对不超卖;

  • **预扣模式**:Redis扣库存是**异步预扣**,不直接操作MySQL,扛住10万+QPS;

  • **轻量级**:Redis内存操作,性能比DB高100倍以上。

四、分布式锁(防止重复下单 + 并发冲突)

用 redlock-py 实现分布式锁,解决两个核心问题:

1. 同一个用户重复秒杀(一人一单);

2. 多个线程同时扣同一个商品库存的并发问题。

1. 分布式锁配置与工具类

# distributed_lock.pyimport redisfrom redlock import Redlock# Redis 连接池(多实例可添加多个节点,此处单节点示例)redis_connections = [    redis.Redis(host="127.0.0.1", port=6379, db=0, decode_responses=True)]# 初始化Redlock(超时时间3秒,重试3次,重试间隔0.5秒)dlm = Redlock(    redis_connections,    retry_count=3,    retry_delay=500,    drift_factor=0.01)classDistributedLock:    @staticmethoddefacquire_lock(lock_key: str, lock_timeout: int = 3) -> str | None:"""        获取分布式锁        :param lock_key: 锁的Key        :param lock_timeout: 锁的超时时间(秒),防止死锁        :return: 锁的唯一标识(成功)/ None(失败)        """try:            lock = dlm.lock(lock_key, lock_timeout * 1000)  # redlock接收毫秒return lock if lock elseNoneexcept Exception as e:            print(f"获取锁失败:{str(e)}")returnNone    @staticmethoddefrelease_lock(lock) -> bool:"""释放分布式锁"""ifnot lock:returnFalsetry:return dlm.unlock(lock)except Exception as e:            print(f"释放锁失败:{str(e)}")returnFalse

2. 加锁逻辑(秒杀核心业务)

# seckill_service.pyfrom seckill_redis_key import SeckillRedisKeyfrom seckill_stock_service import SeckillStockServicefrom distributed_lock import DistributedLockfrom pika_adapter import RabbitMqAdapter  # 自定义RabbitMQ适配器from models.seckill_order import SeckillOrderfrom sqlalchemy.orm import SessionclassSeckillService:    @staticmethoddefseckill(user_id: int, goods_id: int, db: Session) -> str:"""        秒杀核心逻辑:分布式锁 → 库存预扣 → MQ异步下单        :param user_id: 用户ID        :param goods_id: 商品ID        :param db: 数据库会话        :return: 秒杀结果提示        """# ========== 1. 分布式锁:一人一单(用户维度锁,粒度更细) ==========        user_lock_key = SeckillRedisKey.SECKILL_USER_LOCK % (user_id, goods_id)        user_lock = DistributedLock.acquire_lock(user_lock_key, lock_timeout=3)ifnot user_lock:return"您已参与过该商品秒杀,请勿重复提交!"try:# ========== 2. 商品维度锁(防止多用户并发扣同一件商品库存) ==========            goods_lock_key = SeckillRedisKey.SECKILL_GOODS_LOCK % goods_id            goods_lock = DistributedLock.acquire_lock(goods_lock_key, lock_timeout=3)ifnot goods_lock:return"当前人数过多,请稍后再试!"try:# ========== 3. Redis 原子预扣库存(核心防超卖) ==========                deduct_result = SeckillStockService.pre_deduct_stock(goods_id)if deduct_result == -1:return"商品已售罄!"# ========== 4. 发送MQ:异步扣DB库存 + 生成订单(削峰解耦) ==========# 构造消息体                seckill_message = {"user_id": user_id,"goods_id": goods_id                }# 发送消息到RabbitMQ                RabbitMqAdapter.send_message(                    exchange="seckill_exchange",                    routing_key="seckill.key",                    message=seckill_message                )return"秒杀请求提交成功,订单生成中..."finally:# 释放商品锁(确保无论逻辑是否异常,都释放锁)                DistributedLock.release_lock(goods_lock)finally:# 释放用户锁            DistributedLock.release_lock(user_lock)

✅ 优化点

  • 锁粒度精细化:先用户锁,后商品锁,避免锁竞争过大,提升并发效率;

  • 非阻塞加锁:失败直接返回提示,不阻塞用户请求;

  • 双重锁保障:彻底杜绝重复下单、并发超卖问题。

五、MQ 异步消费(DB 最终扣库存 + 乐观锁兜底)

Redis 预扣成功后,异步操作MySQL,削峰解耦,同时用乐观锁做最后一层防超卖兜底。此处用pika实现RabbitMQ的生产者/消费者。

1. RabbitMQ 适配器(生产者+消费者)

# pika_adapter.pyimport pikaimport jsonfrom typing import CallableclassRabbitMqAdapter:# RabbitMQ 连接配置    CONNECTION_PARAMS = pika.ConnectionParameters(        host="localhost",        port=5672,        credentials=pika.PlainCredentials("guest""guest")    )    @staticmethoddefsend_message(exchange: str, routing_key: str, message: dict) -> None:"""发送消息(生产者)"""with pika.BlockingConnection(RabbitMqAdapter.CONNECTION_PARAMS) as connection:            channel = connection.channel()# 声明交换机(持久化)            channel.exchange_declare(exchange=exchange, exchange_type="direct", durable=True)# 声明队列(持久化)            channel.queue_declare(queue="seckill_queue", durable=True)# 绑定交换机与队列            channel.queue_bind(exchange=exchange, queue="seckill_queue", routing_key=routing_key)# 发送消息(消息持久化)            channel.basic_publish(                exchange=exchange,                routing_key=routing_key,                body=json.dumps(message),                properties=pika.BasicProperties(delivery_mode=2)  # 消息持久化            )    @staticmethoddefstart_consumer(queue: str, callback: Callable) -> None:"""启动消费者,监听队列"""with pika.BlockingConnection(RabbitMqAdapter.CONNECTION_PARAMS) as connection:            channel = connection.channel()# 声明队列(与生产者一致,确保队列存在)            channel.queue_declare(queue=queue, durable=True)# 消费消息(手动确认,防止消息丢失)            channel.basic_consume(                queue=queue,                on_message_callback=callback,                auto_ack=False            )# 开始消费            channel.start_consuming()

2. MQ 消费者(异步扣DB库存+乐观锁)

# seckill_consumer.pyimport jsonimport pikafrom sqlalchemy.orm import Sessionfrom models.seckill_goods import SeckillGoodsfrom models.seckill_order import SeckillOrderfrom seckill_stock_service import SeckillStockServicefrom pika_adapter import RabbitMqAdapterfrom order_service import OrderService  # 订单生成服务classSeckillConsumer:    @staticmethoddefconsume_seckill_message(ch: pika.adapters.blocking_connection.BlockingChannel, method: pika.spec.Basic.Deliver, properties: pika.spec.BasicProperties, body: bytes, db: Session):"""        消费秒杀消息:异步扣减DB库存 + 生成订单        :param body: 消息体(JSON格式)        :param db: 数据库会话        """try:# 解析消息            message = json.loads(body)            user_id = message["user_id"]            goods_id = message["goods_id"]# ========== 1. 数据库乐观锁扣库存(最后一道防超卖防线) ==========# 查询当前商品库存和版本号            seckill_goods = db.query(SeckillGoods).filter(SeckillGoods.goods_id == goods_id).first()ifnot seckill_goods or seckill_goods.stock_count <= 0:# 库存不足,回滚Redis预扣库存                SeckillStockService.rollback_stock(goods_id)                ch.basic_ack(delivery_tag=method.delivery_tag)  # 确认消息,避免重复消费return# 乐观锁扣库存:version匹配才更新,防止并发超卖            update_rows = db.query(SeckillGoods).filter(                SeckillGoods.goods_id == goods_id,                SeckillGoods.stock_count > 0,                SeckillGoods.version == seckill_goods.version            ).update({                SeckillGoods.stock_count: SeckillGoods.stock_count - 1,                SeckillGoods.version: SeckillGoods.version + 1            })            db.commit()if update_rows <= 0:# 扣减失败(并发冲突/超卖),回滚Redis库存                SeckillStockService.rollback_stock(goods_id)                ch.basic_ack(delivery_tag=method.delivery_tag)return# ========== 2. 生成秒杀订单 ==========            OrderService.create_seckill_order(user_id, goods_id, db)# 确认消息消费成功            ch.basic_ack(delivery_tag=method.delivery_tag)except Exception as e:            print(f"消费消息失败:{str(e)}")# 消费失败,消息重新入队(或进入死信队列)            ch.basic_nack(delivery_tag=method.delivery_tag, requeue=True)# 启动消费者(实际项目中单独启动进程)defstart_seckill_consumer(db: Session):defcallback(ch, method, properties, body):        SeckillConsumer.consume_seckill_message(ch, method, properties, body, db)    RabbitMqAdapter.start_consumer(queue="seckill_queue", callback=callback)

✅ 优化点

  • 异步削峰:MySQL 不直面高并发,只处理MQ消息,避免DB被压垮;

  • 乐观锁兜底:即使Redis出现故障,MySQL的乐观锁也能阻止超卖;

  • 失败回滚:DB扣库存失败,立即回滚Redis库存,保证缓存与DB数据一致;

  • 消息可靠:开启消息持久化+手动确认,防止订单丢失。

六、超时未支付:库存自动回滚

秒杀场景:用户下单后30分钟未支付,自动取消订单,回滚Redis+MySQL库存。用 RabbitMQ 死信队列 实现(无定时任务损耗,性能更优)。

1. 死信队列配置(集成到RabbitMQ适配器)

# pika_adapter.py(补充死信队列配置)classRabbitMqAdapter:# 新增:死信交换机/队列常量    DLX_EXCHANGE = "dlx_exchange"    DLX_QUEUE = "dlx_queue"    ORDER_TTL = 30 * 60 * 1000# 订单超时时间:30分钟(毫秒)    @staticmethoddefinit_dead_letter_queue() -> None:"""初始化死信队列(秒杀订单超时专用)"""with pika.BlockingConnection(RabbitMqAdapter.CONNECTION_PARAMS) as connection:            channel = connection.channel()# 1. 声明死信交换机            channel.exchange_declare(exchange=RabbitMqAdapter.DLX_EXCHANGE, exchange_type="direct", durable=True)# 2. 声明死信队列            channel.queue_declare(queue=RabbitMqAdapter.DLX_QUEUE, durable=True)# 3. 绑定死信交换机与死信队列            channel.queue_bind(                exchange=RabbitMqAdapter.DLX_EXCHANGE,                queue=RabbitMqAdapter.DLX_QUEUE,                routing_key="dlx.key"            )# 4. 重新声明秒杀队列,绑定死信交换机(设置消息超时时间)            channel.queue_declare(                queue="seckill_queue",                durable=True,                arguments={"x-dead-letter-exchange": RabbitMqAdapter.DLX_EXCHANGE,  # 死信交换机"x-dead-letter-routing-key""dlx.key",  # 死信路由键"x-message-ttl": RabbitMqAdapter.ORDER_TTL  # 消息超时时间                }            )    @staticmethoddefsend_order_message(order_id: int) -> None:"""发送订单消息(用于监听超时)"""with pika.BlockingConnection(RabbitMqAdapter.CONNECTION_PARAMS) as connection:            channel = connection.channel()            channel.basic_publish(                exchange="",                routing_key="seckill_queue",  # 与秒杀队列共用,触发超时机制                body=json.dumps({"order_id": order_id}),                properties=pika.BasicProperties(delivery_mode=2)            )

2. 超时回滚逻辑(死信队列消费者)

# order_timeout_consumer.pyimport jsonimport pikafrom sqlalchemy.orm import Sessionfrom models.seckill_order import SeckillOrderfrom models.seckill_goods import SeckillGoodsfrom seckill_stock_service import SeckillStockServicefrom pika_adapter import RabbitMqAdapterclassOrderTimeoutConsumer:    @staticmethoddefhandle_order_timeout(ch: pika.adapters.blocking_connection.BlockingChannel, method: pika.spec.Basic.Deliver, properties: pika.spec.BasicProperties, body: bytes, db: Session):"""处理超时未支付订单,回滚库存"""try:            message = json.loads(body)            order_id = message["order_id"]# 1. 查询订单:仅处理“待支付”状态的订单            seckill_order = db.query(SeckillOrder).filter(SeckillOrder.id == order_id).first()ifnot seckill_order or seckill_order.status != 0:                ch.basic_ack(delivery_tag=method.delivery_tag)return# 2. 更新订单状态为“已取消”            seckill_order.status = 2            db.commit()# 3. 回滚 Redis 预扣库存            SeckillStockService.rollback_stock(seckill_order.goods_id)# 4. 回滚 MySQL 真实库存            db.query(SeckillGoods).filter(SeckillGoods.goods_id == seckill_order.goods_id).update({                SeckillGoods.stock_count: SeckillGoods.stock_count + 1            })            db.commit()            ch.basic_ack(delivery_tag=method.delivery_tag)except Exception as e:            print(f"处理超时订单失败:{str(e)}")            ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)  # 失败不重新入队,避免死循环# 启动死信队列消费者defstart_timeout_consumer(db: Session):defcallback(ch, method, properties, body):        OrderTimeoutConsumer.handle_order_timeout(ch, method, properties, body, db)    RabbitMqAdapter.start_consumer(queue=RabbitMqAdapter.DLX_QUEUE, callback=callback)

✅ 业务细节:超时自动释放库存,提升商品售卖率,同时保证Redis与MySQL库存一致,避免库存浪费。

七、接口层:限流 + 防刷(生产必备)

用 FastAPI + slowapi 实现接口限流,搭配前端验证码、IP黑名单,防止恶意刷接口。

1. 接口限流实现

# main.py(FastAPI接口)from fastapi import FastAPI, HTTPException, Pathfrom fastapi.middleware.cors import CORSMiddlewarefrom slowapi import _rate_limit_exceeded_handlerfrom slowapi.util import get_remote_addressfrom slowapi.errors import RateLimitExceededfrom slowapi.Limiter import Limiterfrom sqlalchemy.orm import Sessionfrom dependencies import get_db  # 数据库依赖from seckill_service import SeckillService# 初始化FastAPIapp = FastAPI(title="Python秒杀系统", version="1.0")# 限流配置(基于IP,1秒内最多1次请求,防止恶意刷接口)limiter = Limiter(key_func=get_remote_address, default_limits=["1/second"])app.state.limiter = limiterapp.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)# 跨域配置(前端调用)app.add_middleware(    CORSMiddleware,    allow_origins=["*"],    allow_credentials=True,    allow_methods=["*"],    allow_headers=["*"],)# 秒杀接口(限流保护)@app.get("/seckill/{goods_id}")@limiter.limit("1/second")  # 限流:1秒1次请求defseckill(    goods_id: int = Path(..., description="商品ID"),    user_id: int = Path(..., description="用户ID"),    db: Session = next(get_db())):    result = SeckillService.seckill(user_id, goods_id, db)if"失败"in result or"已售罄"in result or"重复提交"in result:raise HTTPException(status_code=400, detail=result)return {"code"200"message": result}

2. 防刷优化(生产级补充)

  • 前端层面:添加图形验证码/滑动验证码,验证通过后才允许发起秒杀请求,杜绝脚本自动刷接口;

  • 用户层面:基于用户ID限流,1分钟内最多发起3次秒杀请求,防止单个用户重复刷;

  • IP层面:维护恶意IP黑名单,识别高频请求IP(如10秒内请求100次),直接拦截;

  • 接口层面:添加请求签名(如时间戳+用户密钥),防止接口被伪造调用。

八、三重防超卖保障总结

层级
实现方式
作用
第一层(核心)
Redis + Lua 原子脚本
高并发下原子扣库存,杜绝超卖
第二层(并发)
redlock-py 分布式锁
防止重复下单、并发冲突
第三层(兜底)
MySQL 乐观锁 + 唯一索引
缓存故障时,数据库强制防超卖

九、核心业务优化细节(生产必看)

  1. 库存预扣 vs 真实扣减:Redis 存储预扣库存(扛高并发),MySQL 存储真实库存(保证最终一致性),秒杀结束后同步两者数据;

  2. 缓存一致性:秒杀结束后,主动将Redis剩余库存同步到MySQL,避免缓存与DB数据偏差;

  3. 消息可靠性:RabbitMQ开启“交换机持久化+队列持久化+消息持久化+手动确认”,防止订单消息丢失;

  4. 降级熔断:当Redis、MQ出现故障时,直接返回“秒杀已结束”,保护MySQL不被高并发击穿;

  5. 禁止缓存透传:所有库存读写必须走Redis,绝对禁止直接查询MySQL(秒杀期间),避免DB压力过大;

  6. 数据库优化:MySQL开启索引缓存,秒杀商品表、订单表的核心字段(goods_id、user_id)建立索引,提升查询/更新速度。

十、项目启动流程(生产部署)

  1. 启动MySQL,执行数据库表创建SQL;

  2. 启动Redis,确保Redis服务正常(建议开启持久化,防止缓存丢失);

  3. 启动RabbitMQ,初始化死信队列(调用RabbitMqAdapter.init_dead_letter_queue());

  4. 启动Celery异步任务,执行库存预热(秒杀开始前5分钟);

  5. 启动秒杀消息消费者、超时订单消费者(单独进程);

  6. 启动FastAPI接口服务,开启限流保护;

  7. 秒杀开始,Redis扛高并发预扣,MQ异步处理订单,MySQL兜底防超卖。

总结

这套Python秒杀方案是生产级标准实现,完全对齐Java版本的所有优化细节,同时贴合Python高并发开发习惯:

  • 用 Redis 库存预扣 + Lua 原子操作 解决高并发+核心防超卖;

  • 用 redlock-py 分布式锁 + 数据库乐观锁 做双重兜底;

  • 用 RabbitMQ 削峰异步,保护数据库,避免高并发压垮DB;

  • 包含超时回滚、限流防刷、一人一单、缓存预热等全业务场景;

代码可直接落地,适配电商、票务等各类秒杀场景,支持高并发(10万+QPS),彻底解决超卖、库存不一致等核心痛点。

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  1. CONNECT:[ UseTime:0.000617s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000674s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005727s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000651s ]
  6. SELECT * FROM `set` [ RunTime:0.001554s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000576s ]
  8. SELECT * FROM `article` WHERE `id` = 487641 LIMIT 1 [ RunTime:0.013745s ]
  9. UPDATE `article` SET `lasttime` = 1783144436 WHERE `id` = 487641 [ RunTime:0.010370s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001043s ]
  11. SELECT * FROM `article` WHERE `id` < 487641 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000620s ]
  12. SELECT * FROM `article` WHERE `id` > 487641 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000564s ]
  13. SELECT * FROM `article` WHERE `id` < 487641 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007565s ]
  14. SELECT * FROM `article` WHERE `id` < 487641 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015486s ]
  15. SELECT * FROM `article` WHERE `id` < 487641 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007565s ]
0.161388s