{"id":185750,"date":"2024-11-11T00:11:21","date_gmt":"2024-11-10T16:11:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185750\/"},"modified":"2024-11-11T00:11:22","modified_gmt":"2024-11-10T16:11:22","slug":"%e6%a8%b9%e5%bd%a2%e8%8f%9c%e5%96%ae%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e8%a8%ad%e8%a8%88%e6%94%bb%e7%95%a5%ef%bc%88%e6%a8%b9%e5%bd%a2%e8%8f%9c%e5%96%ae%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e6%80%8e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185750\/","title":{"rendered":"\u6a39\u5f62\u83dc\u55ae\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u653b\u7565\uff08\u6a39\u5f62\u83dc\u55ae\u6578\u64da\u5eab\u8868\u600e\u9ebc\u8a2d\u8a08\uff09"},"content":{"rendered":"<h1 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id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%9a%84%e8%a8%ad%e8%a8%88-zcwAUIlrcl\">\u6578\u64da\u5eab\u8868\u7684\u8a2d\u8a08<\/h2>\n<p>\u8a2d\u8a08\u6a39\u5f62\u83dc\u55ae\u7684\u6578\u64da\u5eab\u8868\u6642\uff0c\u901a\u5e38\u6709\u5e7e\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff0c\u5305\u62ec\u9130\u63a5\u5217\u8868\uff08Adjacency List\uff09\u3001\u8def\u5f91\u679a\u8209\uff08Path Enumeration\uff09\u3001\u5d4c\u5957\u96c6\uff08Nested Set\uff09\u548c\u9589\u5305\u8868\uff08Closure Table\uff09\u3002\u4ee5\u4e0b\u662f\u9019\u4e9b\u65b9\u6cd5\u7684\u7c21\u8981\u4ecb\u7d39\uff1a<\/p>\n<h3 id=\"1-%e9%84%b0%e6%8e%a5%e5%88%97%e8%a1%a8-zcwAUIlrcl\">1. \u9130\u63a5\u5217\u8868<\/h3>\n<p>\u9130\u63a5\u5217\u8868\u662f\u6700\u7c21\u55ae\u7684\u6a39\u5f62\u7d50\u69cb\u8868\u793a\u6cd5\u3002\u6bcf\u500b\u7bc0\u9ede\u90fd\u6709\u4e00\u500b\u6307\u5411\u5176\u7236\u7bc0\u9ede\u7684\u5f15\u7528\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u9ede\u662f\u7c21\u55ae\u6613\u61c2\uff0c\u4f46\u5728\u67e5\u8a62\u6574\u500b\u6a39\u6642\u6548\u7387\u8f03\u4f4e\u3002<\/p>\n<pre><code>CREATE TABLE categories (\n    id INT PRIMARY KEY,\n    name VARCHAR(255) NOT NULL,\n    parent_id INT,\n    FOREIGN KEY (parent_id) REFERENCES categories(id)\n);<\/code><\/pre>\n<h3 id=\"2-%e8%b7%af%e5%be%91%e6%9e%9a%e8%88%89-zcwAUIlrcl\">2. 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\u9589\u5305\u8868<\/h3>\n<p>\u9589\u5305\u8868\u65b9\u6cd5\u4f7f\u7528\u4e00\u500b\u984d\u5916\u7684\u8868\u4f86\u5b58\u5132\u6240\u6709\u7bc0\u9ede\u4e4b\u9593\u7684\u95dc\u4fc2\uff0c\u9019\u6a23\u53ef\u4ee5\u5feb\u901f\u67e5\u8a62\u4efb\u610f\u7bc0\u9ede\u7684\u6240\u6709\u7956\u5148\u548c\u5f8c\u4ee3\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u67e5\u8a62\u548c\u66f4\u65b0\u6642\u90fd\u975e\u5e38\u9748\u6d3b\uff0c\u4f46\u9700\u8981\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\u3002<\/p>\n<pre><code>CREATE TABLE category_closure (\n    ancestor INT,\n    descendant INT,\n    depth INT,\n    PRIMARY KEY (ancestor, descendant)\n);<\/code><\/pre>\n<h2 id=\"%e9%81%b8%e6%93%87%e5%90%88%e9%81%a9%e7%9a%84%e6%96%b9%e6%b3%95-zcwAUIlrcl\">\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5<\/h2>\n<p>\u9078\u64c7\u54ea\u7a2e\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u61c9\u7528\u9700\u6c42\u3002\u5982\u679c\u61c9\u7528\u4e2d\u983b\u7e41\u9032\u884c\u67e5\u8a62\u64cd\u4f5c\uff0c\u5d4c\u5957\u96c6\u6216\u9589\u5305\u8868\u53ef\u80fd\u662f\u66f4\u597d\u7684\u9078\u64c7\uff1b\u5982\u679c\u63d2\u5165\u548c\u522a\u9664\u64cd\u4f5c\u8f03\u591a\uff0c\u5247\u9130\u63a5\u5217\u8868\u53ef\u80fd\u66f4\u70ba\u5408\u9069\u3002\u4e86\u89e3\u6bcf\u7a2e\u65b9\u6cd5\u7684\u512a\u7f3a\u9ede\uff0c\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u505a\u51fa\u66f4\u660e\u667a\u7684\u9078\u64c7\u3002<\/p>\n<h2 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