{"id":166853,"date":"2024-11-05T20:10:20","date_gmt":"2024-11-05T12:10:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/166853\/"},"modified":"2024-11-05T20:10:21","modified_gmt":"2024-11-05T12:10:21","slug":"%e4%ba%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab-occ%ef%bc%8c%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e4%b8%a6%e7%99%bc%e6%80%a7%e5%92%8c%e6%80%a7%e8%83%bd%e7%ae%a1%e7%90%86-%e6%95%b8%e6%93%9a%e5%ba%ab-occ","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/166853\/","title":{"rendered":"\u4e86\u89e3\u6578\u64da\u5eab OCC\uff0c\u63d0\u9ad8\u6578\u64da\u4e26\u767c\u6027\u548c\u6027\u80fd\u7ba1\u7406 (\u6578\u64da\u5eab occ)"},"content":{"rendered":"<h1 id=\"%e4%ba%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab-occ%ef%bc%8c%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e4%b8%a6%e7%99%bc%e6%80%a7%e5%92%8c%e6%80%a7%e8%83%bd%e7%ae%a1%e7%90%86-%e6%95%b8%e6%93%9a%e5%ba%ab-occ-FYYiDkvRPb\">\u4e86\u89e3\u6578\u64da\u5eab OCC\uff0c\u63d0\u9ad8\u6578\u64da\u4e26\u767c\u6027\u548c\u6027\u80fd\u7ba1\u7406 (\u6578\u64da\u5eab OCC)<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u4e26\u767c\u6027\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6210\u529f\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u7528\u6236\u6578\u91cf\u7684\u589e\u52a0\u548c\u6578\u64da\u91cf\u7684\u64f4\u5927\uff0c\u5982\u4f55\u6709\u6548\u7ba1\u7406\u6578\u64da\u5eab\u7684\u4e26\u767c\u8a2a\u554f\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u7684\u6a02\u89c0\u4e26\u767c\u63a7\u5236\uff08Optimistic Concurrency Control, OCC\uff09\u6280\u8853\uff0c\u4e26\u5206\u6790\u5176\u5728\u63d0\u9ad8\u6578\u64da\u4e26\u767c\u6027\u548c\u6027\u80fd\u7ba1\u7406\u65b9\u9762\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%a8%82%e8%a7%80%e4%b8%a6%e7%99%bc%e6%8e%a7%e5%88%b6%ef%bc%88occ%ef%bc%89%ef%bc%9f-FYYiDkvRPb\">\u4ec0\u9ebc\u662f\u6a02\u89c0\u4e26\u767c\u63a7\u5236\uff08OCC\uff09\uff1f<\/h2>\n<p>\u6a02\u89c0\u4e26\u767c\u63a7\u5236\u662f\u4e00\u7a2e\u6578\u64da\u5eab\u7ba1\u7406\u6280\u8853\uff0c\u65e8\u5728\u89e3\u6c7a\u591a\u7528\u6236\u74b0\u5883\u4e2d\u6578\u64da\u7684\u4e26\u767c\u8a2a\u554f\u554f\u984c\u3002\u8207\u50b3\u7d71\u7684\u60b2\u89c0\u4e26\u767c\u63a7\u5236\uff08Pessimistic Concurrency Control\uff09\u4e0d\u540c\uff0cOCC \u5047\u8a2d\u5728\u5927\u591a\u6578\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u4e0d\u6703\u767c\u751f\u885d\u7a81\uff0c\u56e0\u6b64\u5728\u9032\u884c\u6578\u64da\u64cd\u4f5c\u6642\u4e0d\u6703\u7acb\u5373\u9396\u5b9a\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u5305\u62ec\u4e09\u500b\u4e3b\u8981\u968e\u6bb5\uff1a<\/p>\n<ul>\n<li><strong>\u8b80\u53d6\u968e\u6bb5\uff1a<\/strong>\u7528\u6236\u5f9e\u6578\u64da\u5eab\u4e2d\u8b80\u53d6\u6578\u64da\uff0c\u4e26\u5728\u672c\u5730\u9032\u884c\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u9a57\u8b49\u968e\u6bb5\uff1a<\/strong>\u5728\u63d0\u4ea4\u66f4\u6539\u4e4b\u524d\uff0c\u7cfb\u7d71\u6703\u6aa2\u67e5\u81ea\u8b80\u53d6\u4ee5\u4f86\u6578\u64da\u662f\u5426\u5df2\u88ab\u5176\u4ed6\u7528\u6236\u4fee\u6539\u3002<\/li>\n<li><strong>\u63d0\u4ea4\u968e\u6bb5\uff1a<\/strong>\u5982\u679c\u6578\u64da\u672a\u88ab\u4fee\u6539\uff0c\u5247\u63d0\u4ea4\u66f4\u6539\uff1b\u5426\u5247\uff0c\u64cd\u4f5c\u5c07\u88ab\u62d2\u7d55\uff0c\u4e26\u53ef\u80fd\u9700\u8981\u91cd\u65b0\u8b80\u53d6\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"occ-%e7%9a%84%e5%84%aa%e5%8b%a2-FYYiDkvRPb\">OCC \u7684\u512a\u52e2<\/h2>\n<p>OCC \u7684\u4e3b\u8981\u512a\u52e2\u5728\u65bc\u5176\u9ad8\u6548\u6027\u548c\u9748\u6d3b\u6027\u3002\u7531\u65bc\u4e0d\u9700\u8981\u5728\u8b80\u53d6\u6578\u64da\u6642\u9396\u5b9a\u8cc7\u6e90\uff0cOCC \u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u7cfb\u7d71\u7684\u4e26\u767c\u6027\u3002\u9019\u5c0d\u65bc\u8b80\u53d6\u64cd\u4f5c\u983b\u7e41\u7684\u61c9\u7528\u7a0b\u5e8f\u5c24\u70ba\u91cd\u8981\uff0c\u56e0\u70ba\u5b83\u5011\u53ef\u4ee5\u5728\u4e0d\u5f71\u97ff\u6027\u80fd\u7684\u60c5\u6cc1\u4e0b\u540c\u6642\u8655\u7406\u591a\u500b\u8acb\u6c42\u3002<\/p>\n<p>\u6b64\u5916\uff0cOCC \u9084\u80fd\u6e1b\u5c11\u6b7b\u9396\u7684\u98a8\u96aa\u3002\u5728\u60b2\u89c0\u63a7\u5236\u4e2d\uff0c\u9396\u5b9a\u8cc7\u6e90\u53ef\u80fd\u5c0e\u81f4\u591a\u500b\u7528\u6236\u4e4b\u9593\u7684\u6b7b\u9396\uff0c\u800c OCC \u7684\u8a2d\u8a08\u4f7f\u5f97\u9019\u7a2e\u60c5\u6cc1\u4e0d\u592a\u53ef\u80fd\u767c\u751f\u3002<\/p>\n<h2 id=\"occ-%e7%9a%84%e6%8c%91%e6%88%b0-FYYiDkvRPb\">OCC \u7684\u6311\u6230<\/h2>\n<p>\u5118\u7ba1 OCC \u6709\u8a31\u591a\u512a\u52e2\uff0c\u4f46\u5b83\u4e5f\u9762\u81e8\u4e00\u4e9b\u6311\u6230\u3002\u6700\u4e3b\u8981\u7684\u6311\u6230\u662f\u7576\u6578\u64da\u885d\u7a81\u983b\u7e41\u6642\uff0cOCC \u7684\u6027\u80fd\u53ef\u80fd\u6703\u4e0b\u964d\u3002\u5982\u679c\u7528\u6236\u7d93\u5e38\u5617\u8a66\u63d0\u4ea4\u66f4\u6539\u800c\u9047\u5230\u885d\u7a81\uff0c\u5247\u9700\u8981\u91cd\u8907\u8b80\u53d6\u548c\u63d0\u4ea4\u64cd\u4f5c\uff0c\u9019\u6703\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<p>\u6b64\u5916\uff0cOCC \u9700\u8981\u6709\u6548\u7684\u9a57\u8b49\u6a5f\u5236\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u9019\u610f\u5473\u8457\u7cfb\u7d71\u5fc5\u9808\u80fd\u5920\u5feb\u901f\u6aa2\u67e5\u6578\u64da\u7684\u7248\u672c\uff0c\u9019\u5728\u9ad8\u8ca0\u8f09\u74b0\u5883\u4e2d\u53ef\u80fd\u6703\u6210\u70ba\u4e00\u500b\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<h2 id=\"occ-%e7%9a%84%e5%af%a6%e7%8f%be%e7%a4%ba%e4%be%8b-FYYiDkvRPb\">OCC \u7684\u5be6\u73fe\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 OCC \u5be6\u73fe\u793a\u4f8b\uff0c\u4f7f\u7528\u4f2a\u4ee3\u78bc\u4f86\u8aaa\u660e\u5176\u57fa\u672c\u908f\u8f2f\uff1a<\/p>\n<pre><code>\nfunction updateData(userId, newData) {\n    \/\/ \u8b80\u53d6\u7576\u524d\u6578\u64da\n    currentData = readData(userId);\n    version = currentData.version;\n\n    \/\/ \u5728\u672c\u5730\u9032\u884c\u64cd\u4f5c\n    currentData.value = newData;\n\n    \/\/ \u9a57\u8b49\u968e\u6bb5\n    if (currentData.version == version) {\n        \/\/ \u63d0\u4ea4\u66f4\u6539\n        currentData.version += 1;\n        writeData(userId, currentData);\n    } else {\n        \/\/ \u6578\u64da\u5df2\u88ab\u4fee\u6539\uff0c\u64cd\u4f5c\u5931\u6557\n        throw new Error(\"Data has been modified by another user.\");\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-FYYiDkvRPb\">\u7d50\u8ad6<\/h2>\n<p>\u6a02\u89c0\u4e26\u767c\u63a7\u5236\uff08OCC\uff09\u662f\u4e00\u7a2e\u6709\u6548\u7684\u6578\u64da\u5eab\u7ba1\u7406\u6280\u8853\uff0c\u80fd\u5920\u63d0\u9ad8\u6578\u64da\u7684\u4e26\u767c\u6027\u548c\u6027\u80fd\u7ba1\u7406\u3002\u5118\u7ba1\u5b83\u5728\u9ad8\u885d\u7a81\u74b0\u5883\u4e2d\u53ef\u80fd\u9762\u81e8\u6311\u6230\uff0c\u4f46\u5176\u5728\u5927\u591a\u6578\u61c9\u7528\u5834\u666f\u4e2d\u7684\u512a\u52e2\u4f7f\u5176\u6210\u70ba\u4e00\u500b\u503c\u5f97\u8003\u616e\u7684\u9078\u64c7\u3002\u96a8\u8457\u6578\u64da\u5eab\u6280\u8853\u7684\u767c\u5c55\uff0cOCC \u5c07\u5728\u672a\u4f86\u7684\u6578\u64da\u7ba1\u7406\u4e2d\u626e\u6f14\u8d8a\u4f86\u8d8a\u91cd\u8981\u7684\u89d2\u8272\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u61c9\u7528\u4e2d\u5be6\u65bd\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u6578\u64da\u5eabOCC\uff0c\u63d0\u5347\u6578\u64da\u4e26\u767c\u6027\u8207\u6027\u80fd\u7ba1\u7406\uff0c\u512a\u5316\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u78ba\u4fdd\u9ad8\u6548\u80fd\u8207\u7a69\u5b9a\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-166853","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166853","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=166853"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166853\/revisions"}],"predecessor-version":[{"id":166854,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166853\/revisions\/166854"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=166853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=166853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=166853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}