{"id":166779,"date":"2024-11-05T19:28:25","date_gmt":"2024-11-05T11:28:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/166779\/"},"modified":"2024-11-05T19:28:26","modified_gmt":"2024-11-05T11:28:26","slug":"%e6%a8%82%e8%a7%80%e9%8e%96%e8%88%87redis%e5%88%86%e4%bd%88%e5%bc%8f%e9%8e%96%e5%af%a6%e7%8f%be%e6%9c%8d%e5%8b%99%e5%99%a8%e4%ba%92%e6%96%a5%ef%bc%88%e6%a8%82%e8%a7%80%e9%8e%96%e5%92%8credis%e5%88%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/166779\/","title":{"rendered":"\u6a02\u89c0\u9396\u8207Redis\u5206\u4f48\u5f0f\u9396\u5be6\u73fe\u670d\u52d9\u5668\u4e92\u65a5\uff08\u6a02\u89c0\u9396\u548credis\u5206\u4f48\u9396\uff09"},"content":{"rendered":"

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\u6a02\u89c0\u9396\u7684\u5be6\u73fe<\/h3>\n

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UPDATE account SET balance = balance - 100, version = version + 1 \nWHERE id = 1 AND version = 2;<\/code><\/pre>\n
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\u4ec0\u9ebc\u662fRedis\u5206\u4f48\u5f0f\u9396\uff1f<\/h2>\n
Redis\u5206\u4f48\u5f0f\u9396\u662f\u4e00\u7a2e\u57fa\u65bcRedis\u7684\u9396\u6a5f\u5236\uff0c\u9069\u7528\u65bc\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\u591a\u500b\u5be6\u4f8b\u4e4b\u9593\u7684\u4e92\u65a5\u8a2a\u554f\u3002Redis\u63d0\u4f9b\u4e86\u7c21\u55ae\u800c\u9ad8\u6548\u7684\u9396\u5be6\u73fe\uff0c\u901a\u5e38\u4f7f\u7528SETNX\u547d\u4ee4\u4f86\u5275\u5efa\u9396\uff0c\u4e26\u4f7f\u7528EXPIRE\u547d\u4ee4\u4f86\u8a2d\u7f6e\u9396\u7684\u904e\u671f\u6642\u9593\uff0c\u4ee5\u9632\u6b62\u6b7b\u9396\u7684\u60c5\u6cc1\u767c\u751f\u3002<\/p>\n
Redis\u5206\u4f48\u5f0f\u9396\u7684\u5be6\u73fe<\/h3>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528Redis\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u7684\u793a\u4f8b\uff1a<\/p>\n
import redis\nimport time\n\nr = redis.StrictRedis(host='localhost', port=6379, db=0)\n\ndef acquire_lock(lock_name, acquire_time=10):\n    identifier = str(uuid.uuid4())\n    end = time.time() + acquire_time\n    while time.time() < end:\n        if r.set(lock_name, identifier, nx=True, ex=acquire_time):\n            return identifier\n        time.sleep(0.001)\n    return False\n\ndef release_lock(lock_name, identifier):\n    pipe = r.pipeline(True)\n    while True:\n        try:\n            pipe.watch(lock_name)\n            if pipe.get(lock_name) == identifier:\n                pipe.multi()\n                pipe.delete(lock_name)\n                pipe.execute()\n                return True\n            pipe.unwatch()\n            break\n        except redis.WatchError:\n            pass\n    return False<\/code><\/pre>\n
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\u7e3d\u7d50<\/h2>\n
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