{"id":152173,"date":"2024-11-01T20:43:22","date_gmt":"2024-11-01T12:43:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152173\/"},"modified":"2024-11-01T20:43:23","modified_gmt":"2024-11-01T12:43:23","slug":"%e4%b8%a6%e7%99%bc%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e4%b8%9f%e5%a4%b1%e4%bf%ae%e6%94%b9%e5%95%8f%e9%a1%8c%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%8e%aa%e6%96%bd%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152173\/","title":{"rendered":"\u4e26\u767c\u6578\u64da\u5eab\u4e2d\u4e1f\u5931\u4fee\u6539\u554f\u984c\u7684\u89e3\u6c7a\u63aa\u65bd\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"%e4%b8%a6%e7%99%bc%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e4%b8%9f%e5%a4%b1%e4%bf%ae%e6%94%b9%e5%95%8f%e9%a1%8c%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%8e%aa%e6%96%bd%e8%a9%b3%e8%a7%a3-gzchfiMyCh\">\u4e26\u767c\u6578\u64da\u5eab\u4e2d\u4e1f\u5931\u4fee\u6539\u554f\u984c\u7684\u89e3\u6c7a\u63aa\u65bd\u8a73\u89e3<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u4e26\u767c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u8d8a\u4f86\u8d8a\u666e\u904d\u3002\u96a8\u8457\u591a\u7528\u6236\u540c\u6642\u8a2a\u554f\u6578\u64da\u5eab\u7684\u9700\u6c42\u589e\u52a0\uff0c\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u554f\u984c\u4e5f\u96a8\u4e4b\u800c\u4f86\u3002\u5176\u4e2d\uff0c\u4e1f\u5931\u4fee\u6539\u554f\u984c\uff08Lost Update Problem\uff09\u662f\u4e00\u500b\u5e38\u898b\u7684\u6311\u6230\uff0c\u7279\u5225\u662f\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e00\u554f\u984c\u7684\u6210\u56e0\u53ca\u5176\u89e3\u6c7a\u63aa\u65bd\u3002<\/p>\n<h2 id=\"%e4%b8%9f%e5%a4%b1%e4%bf%ae%e6%94%b9%e5%95%8f%e9%a1%8c%e7%9a%84%e5%ae%9a%e7%be%a9-gzchfiMyCh\">\u4e1f\u5931\u4fee\u6539\u554f\u984c\u7684\u5b9a\u7fa9<\/h2>\n<p>\u4e1f\u5931\u4fee\u6539\u554f\u984c\u767c\u751f\u5728\u5169\u500b\u6216\u591a\u500b\u4e8b\u52d9\u540c\u6642\u8b80\u53d6\u4e26\u4fee\u6539\u540c\u4e00\u6578\u64da\u9805\u6642\u3002\u7576\u9019\u4e9b\u4e8b\u52d9\u5728\u672a\u80fd\u6b63\u78ba\u5354\u8abf\u7684\u60c5\u6cc1\u4e0b\u63d0\u4ea4\u6642\uff0c\u67d0\u4e9b\u4fee\u6539\u53ef\u80fd\u6703\u88ab\u8986\u84cb\uff0c\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u5169\u500b\u7528\u6236\u540c\u6642\u66f4\u65b0\u540c\u4e00\u500b\u7522\u54c1\u7684\u5eab\u5b58\u6578\u91cf\uff0c\u6700\u7d42\u53ea\u6709\u4e00\u500b\u7528\u6236\u7684\u4fee\u6539\u6703\u88ab\u4fdd\u5b58\uff0c\u53e6\u4e00\u500b\u7528\u6236\u7684\u4fee\u6539\u5c07\u6703\u4e1f\u5931\u3002<\/p>\n<h2 id=\"%e4%b8%9f%e5%a4%b1%e4%bf%ae%e6%94%b9%e5%95%8f%e9%a1%8c%e7%9a%84%e6%88%90%e5%9b%a0-gzchfiMyCh\">\u4e1f\u5931\u4fee\u6539\u554f\u984c\u7684\u6210\u56e0<\/h2>\n<ul>\n<li><strong>\u7f3a\u4e4f\u9396\u5b9a\u6a5f\u5236\uff1a<\/strong>\u5728\u6c92\u6709\u9069\u7576\u9396\u5b9a\u7684\u60c5\u6cc1\u4e0b\uff0c\u4e8b\u52d9\u53ef\u4ee5\u540c\u6642\u8a2a\u554f\u548c\u4fee\u6539\u6578\u64da\uff0c\u9019\u662f\u5c0e\u81f4\u4e1f\u5931\u4fee\u6539\u7684\u4e3b\u8981\u539f\u56e0\u3002<\/li>\n<li><strong>\u4e8b\u52d9\u9694\u96e2\u7d1a\u5225\u4e0d\u7576\uff1a<\/strong>\u6578\u64da\u5eab\u7684\u4e8b\u52d9\u9694\u96e2\u7d1a\u5225\u6c7a\u5b9a\u4e86\u4e8b\u52d9\u4e4b\u9593\u7684\u53ef\u898b\u6027\u3002\u8f03\u4f4e\u7684\u9694\u96e2\u7d1a\u5225\uff08\u5982\u8b80\u53d6\u672a\u63d0\u4ea4\uff09\u53ef\u80fd\u6703\u5c0e\u81f4\u4e1f\u5931\u4fee\u6539\u554f\u984c\u3002<\/li>\n<li><strong>\u61c9\u7528\u7a0b\u5e8f\u908f\u8f2f\u932f\u8aa4\uff1a<\/strong>\u5982\u679c\u61c9\u7528\u7a0b\u5e8f\u672a\u80fd\u6b63\u78ba\u8655\u7406\u6578\u64da\u7684\u8b80\u53d6\u548c\u5beb\u5165\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e4%b8%9f%e5%a4%b1%e4%bf%ae%e6%94%b9%e5%95%8f%e9%a1%8c%e7%9a%84%e6%8e%aa%e6%96%bd-gzchfiMyCh\">\u89e3\u6c7a\u4e1f\u5931\u4fee\u6539\u554f\u984c\u7684\u63aa\u65bd<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e9%8e%96%e5%ae%9a%e6%a9%9f%e5%88%b6-gzchfiMyCh\">1. \u4f7f\u7528\u9396\u5b9a\u6a5f\u5236<\/h3>\n<p>\u9396\u5b9a\u662f\u9632\u6b62\u4e26\u767c\u4e8b\u52d9\u540c\u6642\u4fee\u6539\u540c\u4e00\u6578\u64da\u7684\u6709\u6548\u65b9\u6cd5\u3002\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u901a\u5e38\u63d0\u4f9b\u884c\u7d1a\u9396\u6216\u8868\u7d1a\u9396\u3002\u884c\u7d1a\u9396\u5141\u8a31\u591a\u500b\u4e8b\u52d9\u540c\u6642\u8b80\u53d6\u4e0d\u540c\u7684\u884c\uff0c\u4f46\u5728\u5beb\u5165\u6642\u6703\u9396\u5b9a\u7279\u5b9a\u884c\uff0c\u5f9e\u800c\u907f\u514d\u4e1f\u5931\u4fee\u6539\u3002<\/p>\n<pre><code>BEGIN TRANSACTION;\nSELECT * FROM products WHERE id = 1 FOR UPDATE;\nUPDATE products SET stock = stock - 1 WHERE id = 1;\nCOMMIT;<\/code><\/pre>\n<h3 id=\"2-%e6%8f%90%e9%ab%98%e4%ba%8b%e5%8b%99%e9%9a%94%e9%9b%a2%e7%b4%9a%e5%88%a5-gzchfiMyCh\">2. \u63d0\u9ad8\u4e8b\u52d9\u9694\u96e2\u7d1a\u5225<\/h3>\n<p>\u901a\u904e\u63d0\u9ad8\u4e8b\u52d9\u7684\u9694\u96e2\u7d1a\u5225\uff0c\u53ef\u4ee5\u6e1b\u5c11\u4e1f\u5931\u4fee\u6539\u7684\u98a8\u96aa\u3002\u5e38\u898b\u7684\u9694\u96e2\u7d1a\u5225\u5305\u62ec\u53ef\u5e8f\u5217\u5316\u3001\u8b80\u53d6\u5df2\u63d0\u4ea4\u548c\u8b80\u53d6\u672a\u63d0\u4ea4\u3002\u9078\u64c7\u5408\u9069\u7684\u9694\u96e2\u7d1a\u5225\u53ef\u4ee5\u6839\u64da\u61c9\u7528\u7684\u9700\u6c42\u4f86\u5e73\u8861\u6027\u80fd\u548c\u6578\u64da\u4e00\u81f4\u6027\u3002<\/p>\n<pre><code>SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;<\/code><\/pre>\n<h3 id=\"3-%e5%af%a6%e6%96%bd%e6%a8%82%e8%a7%80%e9%8e%96-gzchfiMyCh\">3. \u5be6\u65bd\u6a02\u89c0\u9396<\/h3>\n<p>\u6a02\u89c0\u9396\u662f\u4e00\u7a2e\u4e0d\u4f7f\u7528\u9396\u5b9a\u7684\u7b56\u7565\uff0c\u9069\u5408\u65bc\u8b80\u53d6\u64cd\u4f5c\u9060\u591a\u65bc\u5beb\u5165\u64cd\u4f5c\u7684\u5834\u666f\u3002\u4e8b\u52d9\u5728\u63d0\u4ea4\u6642\u6aa2\u67e5\u6578\u64da\u662f\u5426\u88ab\u5176\u4ed6\u4e8b\u52d9\u4fee\u6539\uff0c\u5982\u679c\u88ab\u4fee\u6539\u5247\u56de\u6efe\u4e26\u91cd\u65b0\u57f7\u884c\u3002<\/p>\n<pre><code>BEGIN TRANSACTION;\nSELECT version FROM products WHERE id = 1;\nUPDATE products SET stock = stock - 1, version = version + 1 WHERE id = 1 AND version = @oldVersion;\nCOMMIT;<\/code><\/pre>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e6%99%82%e9%96%93%e6%88%b3-gzchfiMyCh\">4. \u4f7f\u7528\u6642\u9593\u6233<\/h3>\n<p>\u6642\u9593\u6233\u53ef\u4ee5\u7528\u4f86\u6a19\u8b58\u6578\u64da\u7684\u7248\u672c\u3002\u6bcf\u6b21\u66f4\u65b0\u6578\u64da\u6642\uff0c\u8a18\u9304\u7576\u524d\u7684\u6642\u9593\u6233\uff0c\u4e26\u5728\u63d0\u4ea4\u6642\u6aa2\u67e5\u6642\u9593\u6233\u662f\u5426\u4e00\u81f4\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u672a\u88ab\u5176\u4ed6\u4e8b\u52d9\u4fee\u6539\u3002<\/p>\n<pre><code>BEGIN TRANSACTION;\nSELECT timestamp FROM products WHERE id = 1;\nUPDATE products SET stock = stock - 1, timestamp = CURRENT_TIMESTAMP WHERE id = 1 AND timestamp = @oldTimestamp;\nCOMMIT;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-gzchfiMyCh\">\u7d50\u8ad6<\/h2>\n<p>\u4e1f\u5931\u4fee\u6539\u554f\u984c\u662f\u4e26\u767c\u6578\u64da\u5eab\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u6311\u6230\uff0c\u7406\u89e3\u5176\u6210\u56e0\u4e26\u63a1\u53d6\u9069\u7576\u7684\u89e3\u6c7a\u63aa\u65bd\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528\u9396\u5b9a\u6a5f\u5236\u3001\u63d0\u9ad8\u4e8b\u52d9\u9694\u96e2\u7d1a\u5225\u3001\u5be6\u65bd\u6a02\u89c0\u9396\u548c\u4f7f\u7528\u6642\u9593\u6233\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u6e1b\u5c11\u6578\u64da\u4e1f\u5931\u7684\u98a8\u96aa\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u53ef\u7528\u6027\u548c\u6578\u64da\u4e00\u81f4\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8a73\u89e3\u4e26\u767c\u6578\u64da\u5eab\u4e2d\u4e1f\u5931\u4fee\u6539\u554f\u984c\u7684\u89e3\u6c7a\u63aa\u65bd\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u7cfb\u7d71\u7a69\u5b9a\u6027\uff0c\u78ba\u4fdd\u6578\u64da\u5b89\u5168\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-152173","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152173","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=152173"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152173\/revisions"}],"predecessor-version":[{"id":152174,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152173\/revisions\/152174"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}