{"id":185956,"date":"2024-11-11T01:54:28","date_gmt":"2024-11-10T17:54:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185956\/"},"modified":"2024-11-11T01:54:29","modified_gmt":"2024-11-10T17:54:29","slug":"%e6%95%b8%e6%93%9a%e5%ba%abdelete%e6%93%8d%e4%bd%9c%e7%9a%84%e5%9b%9e%e6%bb%be%e6%8a%80%e8%a1%93%e8%a9%b3%e8%a7%a3%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%abdelete%e5%9b%9e%e6%bb%be%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185956\/","title":{"rendered":"\u6578\u64da\u5eabdelete\u64cd\u4f5c\u7684\u56de\u6efe\u6280\u8853\u8a73\u89e3\uff08\u6578\u64da\u5eabdelete\u56de\u6efe\uff09"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%abdelete%e6%93%8d%e4%bd%9c%e7%9a%84%e5%9b%9e%e6%bb%be%e6%8a%80%e8%a1%93%e8%a9%b3%e8%a7%a3%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%abdelete%e5%9b%9e%e6%bb%be%ef%bc%89-nMXkuGbsDi\">\u6578\u64da\u5eabdelete\u64cd\u4f5c\u7684\u56de\u6efe\u6280\u8853\u8a73\u89e3\uff08\u6578\u64da\u5eabdelete\u56de\u6efe\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cdelete\u64cd\u4f5c\u662f\u5e38\u898b\u7684\u6578\u64da\u64cd\u4f5c\u4e4b\u4e00\u3002\u5b83\u5141\u8a31\u7528\u6236\u5f9e\u6578\u64da\u5eab\u4e2d\u522a\u9664\u4e0d\u518d\u9700\u8981\u7684\u6578\u64da\u3002\u7136\u800c\uff0c\u9019\u4e00\u64cd\u4f5c\u7684\u4e0d\u53ef\u9006\u6027\u5e38\u5e38\u8b93\u958b\u767c\u8005\u611f\u5230\u64d4\u6182\uff0c\u7279\u5225\u662f\u5728\u8aa4\u522a\u9664\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u4e00\u554f\u984c\uff0c\u6578\u64da\u5eab\u7cfb\u7d71\u63d0\u4f9b\u4e86\u56de\u6efe\u6280\u8853\uff0c\u8b93\u7528\u6236\u80fd\u5920\u5728\u522a\u9664\u64cd\u4f5c\u5f8c\u6062\u5fa9\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eabdelete\u64cd\u4f5c\u7684\u56de\u6efe\u6280\u8853\u53ca\u5176\u5be6\u73fe\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"1-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e4%ba%8b%e5%8b%99%e7%ae%a1%e7%90%86-nMXkuGbsDi\">1. \u6578\u64da\u5eab\u7684\u4e8b\u52d9\u7ba1\u7406<\/h2>\n<p>\u5728\u8a0e\u8ad6delete\u64cd\u4f5c\u7684\u56de\u6efe\u6280\u8853\u4e4b\u524d\uff0c\u6211\u5011\u9996\u5148\u9700\u8981\u4e86\u89e3\u6578\u64da\u5eab\u7684\u4e8b\u52d9\u7ba1\u7406\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\u4e8b\u52d9\u7684\u56db\u500b\u7279\u6027\uff08ACID\uff09\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u539f\u5b50\u6027\uff08Atomicity\uff09<\/strong>\uff1a\u4e8b\u52d9\u4e2d\u7684\u6240\u6709\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u57f7\u884c\uff0c\u8981\u9ebc\u5168\u90e8\u4e0d\u57f7\u884c\u3002<\/li>\n<li><strong>\u4e00\u81f4\u6027\uff08Consistency\uff09<\/strong>\uff1a\u4e8b\u52d9\u57f7\u884c\u524d\u5f8c\uff0c\u6578\u64da\u5eab\u7684\u72c0\u614b\u5fc5\u9808\u4fdd\u6301\u4e00\u81f4\u3002<\/li>\n<li><strong>\u9694\u96e2\u6027\uff08Isolation\uff09<\/strong>\uff1a\u4e8b\u52d9\u7684\u57f7\u884c\u4e0d\u61c9\u53d7\u5230\u5176\u4ed6\u4e8b\u52d9\u7684\u5f71\u97ff\u3002<\/li>\n<li><strong>\u6301\u4e45\u6027\uff08Durability\uff09<\/strong>\uff1a\u4e00\u65e6\u4e8b\u52d9\u63d0\u4ea4\uff0c\u5176\u7d50\u679c\u61c9\u6c38\u4e45\u4fdd\u5b58\u3002<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u7279\u6027\u78ba\u4fdd\u4e86\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u53ef\u9760\u6027\uff0c\u4e26\u70badelete\u64cd\u4f5c\u7684\u56de\u6efe\u63d0\u4f9b\u4e86\u57fa\u790e\u3002<\/p>\n<h2 id=\"2-delete%e6%93%8d%e4%bd%9c%e7%9a%84%e5%9b%9e%e6%bb%be%e6%8a%80%e8%a1%93-nMXkuGbsDi\">2. delete\u64cd\u4f5c\u7684\u56de\u6efe\u6280\u8853<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0cdelete\u64cd\u4f5c\u901a\u5e38\u6703\u7acb\u5373\u522a\u9664\u6307\u5b9a\u7684\u6578\u64da\u884c\u3002\u7136\u800c\uff0c\u70ba\u4e86\u9632\u6b62\u8aa4\u522a\u9664\uff0c\u6578\u64da\u5eab\u7cfb\u7d71\u901a\u5e38\u6703\u4f7f\u7528\u4e8b\u52d9\u4f86\u7ba1\u7406delete\u64cd\u4f5c\u3002\u7576\u4e00\u500bdelete\u64cd\u4f5c\u88ab\u57f7\u884c\u6642\uff0c\u6578\u64da\u5eab\u6703\u5c07\u8a72\u64cd\u4f5c\u8a18\u9304\u5728\u4e8b\u52d9\u65e5\u8a8c\u4e2d\uff0c\u4e26\u5728\u4e8b\u52d9\u63d0\u4ea4\u4e4b\u524d\u4fdd\u6301\u6578\u64da\u7684\u539f\u59cb\u72c0\u614b\u3002<\/p>\n<p>\u4ee5\u4e0b\u662fdelete\u64cd\u4f5c\u7684\u56de\u6efe\u904e\u7a0b\uff1a<\/p>\n<pre><code>BEGIN TRANSACTION;  -- \u958b\u59cb\u4e8b\u52d9\nDELETE FROM users WHERE id = 1;  -- \u57f7\u884c\u522a\u9664\u64cd\u4f5c\nROLLBACK;  -- \u56de\u6efe\u64cd\u4f5c\uff0c\u6062\u5fa9\u6578\u64da\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u7576delete\u64cd\u4f5c\u57f7\u884c\u5f8c\uff0c\u5982\u679c\u767c\u73fe\u522a\u9664\u7684\u6578\u64da\u4e0d\u61c9\u8a72\u88ab\u522a\u9664\uff0c\u53ef\u4ee5\u901a\u904eROLLBACK\u547d\u4ee4\u4f86\u64a4\u92b7\u8a72\u64cd\u4f5c\uff0c\u6062\u5fa9\u6578\u64da\u7684\u539f\u59cb\u72c0\u614b\u3002<\/p>\n<h2 id=\"3-%e5%af%a6%e7%8f%bedelete%e5%9b%9e%e6%bb%be%e7%9a%84%e6%8a%80%e8%a1%93-nMXkuGbsDi\">3. \u5be6\u73fedelete\u56de\u6efe\u7684\u6280\u8853<\/h2>\n<p>\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u53ef\u80fd\u6703\u6709\u4e0d\u540c\u7684\u5be6\u73fe\u65b9\u5f0f\uff0c\u4f46\u5927\u591a\u6578\u73fe\u4ee3\u6578\u64da\u5eab\u7cfb\u7d71\uff08\u5982MySQL\u3001PostgreSQL\u3001Oracle\u7b49\uff09\u90fd\u652f\u6301\u4e8b\u52d9\u7ba1\u7406\u548c\u56de\u6efe\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u5be6\u73fe\u6280\u8853\uff1a<\/p>\n<ul>\n<li><strong>\u4e8b\u52d9\u65e5\u8a8c\uff08Transaction Log\uff09<\/strong>\uff1a\u6578\u64da\u5eab\u7cfb\u7d71\u6703\u8a18\u9304\u6240\u6709\u7684\u4e8b\u52d9\u64cd\u4f5c\uff0c\u5305\u62ecdelete\u64cd\u4f5c\u3002\u9019\u4e9b\u65e5\u8a8c\u53ef\u4ee5\u7528\u65bc\u56de\u6efe\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u5feb\u7167\u6280\u8853\uff08Snapshot Technology\uff09<\/strong>\uff1a\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u4f7f\u7528\u5feb\u7167\u4f86\u4fdd\u5b58\u6578\u64da\u7684\u72c0\u614b\uff0c\u9019\u6a23\u5728\u56de\u6efe\u6642\u53ef\u4ee5\u6062\u5fa9\u5230\u5feb\u7167\u7684\u72c0\u614b\u3002<\/li>\n<li><strong>\u9396\u5b9a\u6a5f\u5236\uff08Locking Mechanism\uff09<\/strong>\uff1a\u5728\u57f7\u884cdelete\u64cd\u4f5c\u6642\uff0c\u6578\u64da\u5eab\u53ef\u80fd\u6703\u9396\u5b9a\u76f8\u95dc\u7684\u6578\u64da\u884c\uff0c\u4ee5\u9632\u6b62\u5176\u4ed6\u4e8b\u52d9\u5c0d\u5176\u9032\u884c\u4fee\u6539\u3002<\/li>\n<\/ul>\n<h2 id=\"4-%e5%af%a6%e9%9a%9b%e6%a1%88%e4%be%8b%e5%88%86%e6%9e%90-nMXkuGbsDi\">4. \u5be6\u969b\u6848\u4f8b\u5206\u6790<\/h2>\n<p>\u5047\u8a2d\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u7684\u6578\u64da\u5eab\u4e2d\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u7576\u7ba1\u7406\u54e1\u9700\u8981\u522a\u9664\u67d0\u500b\u7528\u6236\u7684\u8cec\u865f\u6642\uff0c\u53ef\u80fd\u6703\u57f7\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<pre><code>BEGIN TRANSACTION;\nDELETE FROM users WHERE id = 123;  -- \u522a\u9664\u7528\u6236\n-- \u5047\u8a2d\u5728\u6b64\u904e\u7a0b\u4e2d\u767c\u73fe\u522a\u9664\u932f\u8aa4\nROLLBACK;  -- \u56de\u6efe\u64cd\u4f5c\n<\/code><\/pre>\n<p>\u901a\u904e\u4f7f\u7528\u4e8b\u52d9\uff0c\u7ba1\u7406\u54e1\u53ef\u4ee5\u5728\u767c\u73fe\u932f\u8aa4\u5f8c\u8fc5\u901f\u6062\u5fa9\u88ab\u522a\u9664\u7684\u7528\u6236\u6578\u64da\uff0c\u907f\u514d\u4e86\u6578\u64da\u7684\u6c38\u4e45\u4e1f\u5931\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nMXkuGbsDi\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u7684delete\u64cd\u4f5c\u96d6\u7136\u5f37\u5927\uff0c\u4f46\u5176\u4e0d\u53ef\u9006\u6027\u5e38\u5e38\u8b93\u958b\u767c\u8005\u611f\u5230\u4e0d\u5b89\u3002\u901a\u904e\u4e8b\u52d9\u7ba1\u7406\u548c\u56de\u6efe\u6280\u8853\uff0c\u6578\u64da\u5eab\u7cfb\u7d71\u80fd\u5920\u6709\u6548\u5730\u9632\u6b62\u8aa4\u522a\u9664\u7684\u60c5\u6cc1\u767c\u751f\u3002\u4e86\u89e3\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u5b89\u5168\u6027\uff0c\u9084\u80fd\u589e\u5f37\u958b\u767c\u8005\u5728\u6578\u64da\u64cd\u4f5c\u904e\u7a0b\u4e2d\u7684\u4fe1\u5fc3\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\u3002\u6211\u5011\u63d0\u4f9b\u5404\u7a2e <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u548c\u61c9\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eabdelete\u64cd\u4f5c\u7684\u56de\u6efe\u6280\u8853\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u6062\u5fa9\u522a\u9664\u6578\u64da\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u8207\u5b89\u5168\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-185956","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185956","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=185956"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185956\/revisions"}],"predecessor-version":[{"id":185957,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185956\/revisions\/185957"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185956"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185956"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}