{"id":187194,"date":"2024-11-11T12:14:21","date_gmt":"2024-11-11T04:14:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187194\/"},"modified":"2024-11-11T12:14:21","modified_gmt":"2024-11-11T04:14:21","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99%ef%bc%9a%e5%8e%9f%e5%ad%90%e6%80%a7%e3%80%81%e4%b8%80%e8%87%b4%e6%80%a7%e5%92%8c%e9%9a%94%e9%9b%a2%e6%80%a7-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187194\/","title":{"rendered":"\u6578\u64da\u5eab\u4e8b\u52d9\uff1a\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u548c\u9694\u96e2\u6027 (\u6578\u64da\u5eab\u4e8b\u52d9\u4e09\u500b\u5c6c\u6027)"},"content":{"rendered":"

\u6578\u64da\u5eab\u4e8b\u52d9\uff1a\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u548c\u9694\u96e2\u6027 (\u6578\u64da\u5eab\u4e8b\u52d9\u4e09\u500b\u5c6c\u6027)<\/h1>\n

\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u5eab\u4e8b\u52d9\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u53ef\u9760\u6027\u7684\u91cd\u8981\u6982\u5ff5\u3002\u4e8b\u52d9\u662f\u4e00\u7d44\u64cd\u4f5c\u7684\u96c6\u5408\uff0c\u9019\u4e9b\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u5931\u6557\u3002\u9019\u7a2e\u7279\u6027\u88ab\u7a31\u70baACID\u5c6c\u6027\uff0c\u5176\u4e2d\u5305\u62ec\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u548c\u9694\u96e2\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e09\u500b\u5c6c\u6027\u53ca\u5176\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n

\u539f\u5b50\u6027 (Atomicity)<\/h2>\n

\u539f\u5b50\u6027\u662f\u6307\u4e8b\u52d9\u4e2d\u7684\u6240\u6709\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u57f7\u884c\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u4e0d\u57f7\u884c\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u4e8b\u52d9\u4e2d\u7684\u67d0\u4e00\u90e8\u5206\u5931\u6557\uff0c\u6574\u500b\u4e8b\u52d9\u5c07\u88ab\u56de\u6efe\u5230\u4e8b\u52d9\u958b\u59cb\u4e4b\u524d\u7684\u72c0\u614b\u3002\u9019\u6a23\u53ef\u4ee5\u9632\u6b62\u6578\u64da\u5eab\u9032\u5165\u4e0d\u4e00\u81f4\u7684\u72c0\u614b\u3002<\/p>\n

\u4f8b\u5982\uff0c\u8003\u616e\u4e00\u500b\u9280\u884c\u8f49\u8cec\u7684\u4e8b\u52d9\uff0c\u8a72\u4e8b\u52d9\u5305\u62ec\u5f9e\u4e00\u500b\u8cec\u6236\u6263\u6b3e\u548c\u5411\u53e6\u4e00\u500b\u8cec\u6236\u5b58\u6b3e\u3002\u5982\u679c\u5728\u6263\u6b3e\u6210\u529f\u5f8c\uff0c\u5b58\u6b3e\u64cd\u4f5c\u5931\u6557\uff0c\u5247\u6574\u500b\u8f49\u8cec\u4e8b\u52d9\u61c9\u8a72\u88ab\u56de\u6efe\uff0c\u9019\u6a23\u5c31\u4e0d\u6703\u51fa\u73fe\u4e00\u500b\u8cec\u6236\u6263\u6b3e\u800c\u53e6\u4e00\u500b\u8cec\u6236\u672a\u5b58\u6b3e\u7684\u60c5\u6cc1\u3002<\/p>\n

\nBEGIN TRANSACTION;\nUPDATE accounts SET balance = balance - 100 WHERE account_id = 'A';\nUPDATE accounts SET balance = balance + 100 WHERE account_id = 'B';\nCOMMIT; -- \u5982\u679c\u6240\u6709\u64cd\u4f5c\u6210\u529f\nROLLBACK; -- \u5982\u679c\u6709\u4efb\u4f55\u64cd\u4f5c\u5931\u6557\n<\/code><\/pre>\n
\u4e00\u81f4\u6027 (Consistency)<\/h2>\n
\u4e00\u81f4\u6027\u662f\u6307\u4e8b\u52d9\u5728\u57f7\u884c\u524d\u5f8c\uff0c\u6578\u64da\u5eab\u5fc5\u9808\u4fdd\u6301\u4e00\u81f4\u7684\u72c0\u614b\u3002\u9019\u610f\u5473\u8457\u4e8b\u52d9\u7684\u57f7\u884c\u4e0d\u61c9\u9055\u53cd\u6578\u64da\u5eab\u7684\u5b8c\u6574\u6027\u7d04\u675f\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u4e00\u500b\u6578\u64da\u5eab\u4e2d\u6709\u4e00\u500b\u7d04\u675f\u689d\u4ef6\uff0c\u8981\u6c42\u8cec\u6236\u7684\u9918\u984d\u4e0d\u80fd\u70ba\u8ca0\u6578\u3002\u5982\u679c\u4e00\u500b\u4e8b\u52d9\u5c0e\u81f4\u67d0\u500b\u8cec\u6236\u7684\u9918\u984d\u8b8a\u70ba\u8ca0\u6578\uff0c\u90a3\u9ebc\u9019\u500b\u4e8b\u52d9\u5c31\u9055\u53cd\u4e86\u4e00\u81f4\u6027\u539f\u5247\u3002<\/p>\n
\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u6703\u5728\u4e8b\u52d9\u958b\u59cb\u4e4b\u524d\u6aa2\u67e5\u6240\u6709\u7684\u7d04\u675f\u689d\u4ef6\uff0c\u4e26\u5728\u4e8b\u52d9\u7d50\u675f\u5f8c\u518d\u6b21\u6aa2\u67e5\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u5982\u679c\u4e8b\u52d9\u5c0e\u81f4\u4e0d\u4e00\u81f4\uff0c\u5247\u6703\u56de\u6efe\u4e8b\u52d9\u3002<\/p>\n
\nBEGIN TRANSACTION;\nUPDATE accounts SET balance = balance - 100 WHERE account_id = 'A';\nIF (SELECT balance FROM accounts WHERE account_id = 'A') < 0 THEN\n    ROLLBACK; -- \u5982\u679c\u9918\u984d\u70ba\u8ca0\uff0c\u56de\u6efe\u4e8b\u52d9\nELSE\n    COMMIT; -- \u5426\u5247\u63d0\u4ea4\u4e8b\u52d9\nEND IF;\n<\/code><\/pre>\n
\u9694\u96e2\u6027 (Isolation)<\/h2>\n
\u9694\u96e2\u6027\u662f\u6307\u4e8b\u52d9\u7684\u57f7\u884c\u4e0d\u61c9\u53d7\u5230\u5176\u4ed6\u4e8b\u52d9\u7684\u5f71\u97ff\u3002\u9019\u610f\u5473\u8457\u5373\u4f7f\u591a\u500b\u4e8b\u52d9\u540c\u6642\u57f7\u884c\uff0c\u6bcf\u500b\u4e8b\u52d9\u90fd\u61c9\u8a72\u611f\u89ba\u5230\u81ea\u5df1\u662f\u552f\u4e00\u5728\u57f7\u884c\u7684\u4e8b\u52d9\u3002\u9694\u96e2\u6027\u53ef\u4ee5\u901a\u904e\u4e0d\u540c\u7684\u9694\u96e2\u7d1a\u5225\u4f86\u5be6\u73fe\uff0c\u9019\u4e9b\u7d1a\u5225\u5b9a\u7fa9\u4e86\u4e8b\u52d9\u4e4b\u9593\u7684\u53ef\u898b\u6027\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u9ad8\u9694\u96e2\u7d1a\u5225\u4e0b\uff0c\u4e8b\u52d9A\u5728\u57f7\u884c\u6642\uff0c\u4e8b\u52d9B\u7121\u6cd5\u770b\u5230\u4e8b\u52d9A\u7684\u4e2d\u9593\u7d50\u679c\u3002\u9019\u6a23\u53ef\u4ee5\u9632\u6b62\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u767c\u751f\u3002\u7136\u800c\uff0c\u904e\u9ad8\u7684\u9694\u96e2\u7d1a\u5225\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u56e0\u70ba\u4e8b\u52d9\u9700\u8981\u7b49\u5f85\u5176\u4ed6\u4e8b\u52d9\u5b8c\u6210\u3002<\/p>\n
\nSET TRANSACTION ISOLATION LEVEL SERIALIZABLE;\nBEGIN TRANSACTION;\nSELECT * FROM accounts WHERE account_id = 'A';\n-- \u5176\u4ed6\u64cd\u4f5c\nCOMMIT;\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u6578\u64da\u5eab\u4e8b\u52d9\u7684ACID\u5c6c\u6027\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u53ef\u9760\u6027\u7684\u57fa\u77f3\u3002\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u548c\u9694\u96e2\u6027\u5171\u540c\u4f5c\u7528\uff0c\u78ba\u4fdd\u4e86\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\u6578\u64da\u7684\u6b63\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u7406\u89e3\u9019\u4e9b\u5c6c\u6027\u5c0d\u65bc\u8a2d\u8a08\u548c\u5be6\u65bd\u9ad8\u6548\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u4e14\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 \u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u6700\u4f73\u7684\u652f\u6301\u548c\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u6578\u64da\u5eab\u4e8b\u52d9\u7684\u4e09\u500b\u95dc\u9375\u5c6c\u6027\uff1a\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u548c\u9694\u96e2\u6027\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u53ef\u9760\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-187194","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=187194"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187194\/revisions"}],"predecessor-version":[{"id":187195,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187194\/revisions\/187195"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}