{"id":65403,"date":"2024-10-14T13:42:18","date_gmt":"2024-10-14T05:42:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/65403\/"},"modified":"2024-10-14T13:42:18","modified_gmt":"2024-10-14T05:42:18","slug":"mssql%e7%b5%90%e6%a7%8b%e6%a8%b9%e7%9a%84%e6%9f%a5%e8%a9%a2%e6%8a%80%e8%a1%93%e5%8f%8a%e6%87%89%e7%94%a8%ef%bc%88mssql%e7%b5%90%e6%a7%8b%e6%a8%b9%e6%9f%a5%e8%a9%a2%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/65403\/","title":{"rendered":"MSSQL\u7d50\u69cb\u6a39\u7684\u67e5\u8a62\u6280\u8853\u53ca\u61c9\u7528\uff08mssql\u7d50\u69cb\u6a39\u67e5\u8a62\uff09"},"content":{"rendered":"<h1 id=\"mssql%e7%b5%90%e6%a7%8b%e6%a8%b9%e7%9a%84%e6%9f%a5%e8%a9%a2%e6%8a%80%e8%a1%93%e5%8f%8a%e6%87%89%e7%94%a8%ef%bc%88mssql%e7%b5%90%e6%a7%8b%e6%a8%b9%e6%9f%a5%e8%a9%a2%ef%bc%89-PizQOiOhUl\">MSSQL\u7d50\u69cb\u6a39\u7684\u67e5\u8a62\u6280\u8853\u53ca\u61c9\u7528\uff08mssql\u7d50\u69cb\u6a39\u67e5\u8a62\uff09<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d50\u69cb\u6a39\uff08Hierarchical Data\uff09\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u6578\u64da\u7d44\u7e54\u65b9\u5f0f\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5177\u6709\u5c64\u6b21\u7d50\u69cb\u7684\u6578\u64da\u6642\u3002Microsoft SQL Server\uff08MSSQL\uff09\u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u8a62\u6280\u8853\u4f86\u6709\u6548\u5730\u8655\u7406\u548c\u67e5\u8a62\u9019\u985e\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0eMSSQL\u7d50\u69cb\u6a39\u7684\u67e5\u8a62\u6280\u8853\u53ca\u5176\u61c9\u7528\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728\u5be6\u969b\u5834\u666f\u4e2d\u904b\u7528\u9019\u4e9b\u6280\u8853\u3002<\/p>\n<h2 id=\"%e7%b5%90%e6%a7%8b%e6%a8%b9%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-PizQOiOhUl\">\u7d50\u69cb\u6a39\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u7d50\u69cb\u6a39\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u901a\u5e38\u7528\u65bc\u8868\u793a\u7236\u5b50\u95dc\u4fc2\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u7d44\u7e54\u67b6\u69cb\u5716\u3001\u7522\u54c1\u5206\u985e\u7b49\u90fd\u53ef\u4ee5\u7528\u7d50\u69cb\u6a39\u4f86\u8868\u793a\u3002\u5728MSSQL\u4e2d\uff0c\u7d50\u69cb\u6a39\u901a\u5e38\u4f7f\u7528\u81ea\u5f15\u7528\u8868\uff08Self-Referencing Table\uff09\u4f86\u5be6\u73fe\u3002\u9019\u7a2e\u8868\u683c\u4e2d\uff0c\u6bcf\u4e00\u884c\u90fd\u5305\u542b\u4e00\u500b\u6307\u5411\u5176\u7236\u9805\u7684\u5916\u9375\u3002<\/p>\n<h3 id=\"%e8%87%aa%e5%bc%95%e7%94%a8%e8%a1%a8%e7%9a%84%e8%a8%ad%e8%a8%88-PizQOiOhUl\">\u81ea\u5f15\u7528\u8868\u7684\u8a2d\u8a08<\/h3>\n<p>\u5728\u8a2d\u8a08\u81ea\u5f15\u7528\u8868\u6642\uff0c\u901a\u5e38\u6703\u5305\u542b\u4ee5\u4e0b\u5e7e\u500b\u6b04\u4f4d\uff1a<\/p>\n<ul>\n<li><strong>ID<\/strong>: \u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u500b\u7bc0\u9ede\u3002<\/li>\n<li><strong>ParentID<\/strong>: \u6307\u5411\u7236\u7bc0\u9ede\u7684ID\u3002<\/li>\n<li><strong>Name<\/strong>: \u7bc0\u9ede\u7684\u540d\u7a31\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u81ea\u5f15\u7528\u8868\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE Categories (\n    ID INT PRIMARY KEY,\n    ParentID INT NULL,\n    Name NVARCHAR(100),\n    FOREIGN KEY (ParentID) REFERENCES Categories(ID)\n);<\/code><\/pre>\n<h2 id=\"mssql%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%a7%8b%e6%a8%b9%e7%9a%84%e6%8a%80%e8%a1%93-PizQOiOhUl\">MSSQL\u67e5\u8a62\u7d50\u69cb\u6a39\u7684\u6280\u8853<\/h2>\n<p>\u5728MSSQL\u4e2d\uff0c\u67e5\u8a62\u7d50\u69cb\u6a39\u7684\u4e3b\u8981\u6280\u8853\u5305\u62ec\u905e\u8ff4\u67e5\u8a62\u548cCTE\uff08Common Table Expressions\uff09\u3002\u9019\u4e9b\u6280\u8853\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u8f15\u9b06\u5730\u7372\u53d6\u6574\u500b\u6a39\u72c0\u7d50\u69cb\u6216\u7279\u5b9a\u5c64\u7d1a\u7684\u6578\u64da\u3002<\/p>\n<h3 id=\"%e9%81%9e%e8%bf%b4%e6%9f%a5%e8%a9%a2-PizQOiOhUl\">\u905e\u8ff4\u67e5\u8a62<\/h3>\n<p>\u905e\u8ff4\u67e5\u8a62\u662f\u4e00\u7a2e\u901a\u904e\u81ea\u6211\u8abf\u7528\u4f86\u7372\u53d6\u6578\u64da\u7684\u67e5\u8a62\u65b9\u5f0f\u3002\u5728MSSQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528CTE\u4f86\u5be6\u73fe\u905e\u8ff4\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528CTE\u67e5\u8a62\u6574\u500b\u7d50\u69cb\u6a39\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>WITH RecursiveCTE AS (\n    SELECT ID, ParentID, Name\n    FROM Categories\n    WHERE ParentID IS NULL\n    UNION ALL\n    SELECT c.ID, c.ParentID, c.Name\n    FROM Categories c\n    INNER JOIN RecursiveCTE r ON c.ParentID = r.ID\n)\nSELECT * FROM RecursiveCTE;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de\u6574\u500b\u7d50\u69cb\u6a39\u7684\u6240\u6709\u7bc0\u9ede\uff0c\u5f9e\u6839\u7bc0\u9ede\u958b\u59cb\uff0c\u9010\u5c64\u5411\u4e0b\u67e5\u8a62\u3002<\/p>\n<h3 id=\"%e6%9f%a5%e8%a9%a2%e7%89%b9%e5%ae%9a%e5%b1%a4%e7%b4%9a%e7%9a%84%e6%95%b8%e6%93%9a-PizQOiOhUl\">\u67e5\u8a62\u7279\u5b9a\u5c64\u7d1a\u7684\u6578\u64da<\/h3>\n<p>\u5982\u679c\u53ea\u60f3\u67e5\u8a62\u7279\u5b9a\u5c64\u7d1a\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u5728CTE\u4e2d\u6dfb\u52a0\u5c64\u7d1a\u8a08\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u8a62\u7b2c\u4e8c\u5c64\u7d1a\u7bc0\u9ede\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>WITH RecursiveCTE AS (\n    SELECT ID, ParentID, Name, 0 AS Level\n    FROM Categories\n    WHERE ParentID IS NULL\n    UNION ALL\n    SELECT c.ID, c.ParentID, c.Name, r.Level + 1\n    FROM Categories c\n    INNER JOIN RecursiveCTE r ON c.ParentID = r.ID\n)\nSELECT * FROM RecursiveCTE WHERE Level = 1;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e6%a7%8b%e6%a8%b9%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-PizQOiOhUl\">\u7d50\u69cb\u6a39\u67e5\u8a62\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>MSSQL\u7d50\u69cb\u6a39\u67e5\u8a62\u6280\u8853\u5728\u591a\u500b\u9818\u57df\u4e2d\u90fd\u6709\u5ee3\u6cdb\u7684\u61c9\u7528\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u7d44\u7e54\u67b6\u69cb\u7ba1\u7406<\/strong>: \u7528\u65bc\u67e5\u8a62\u548c\u7ba1\u7406\u516c\u53f8\u5167\u90e8\u7684\u7d44\u7e54\u7d50\u69cb\u3002<\/li>\n<li><strong>\u7522\u54c1\u5206\u985e<\/strong>: \u5728\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u5e6b\u52a9\u7528\u6236\u67e5\u8a62\u7522\u54c1\u7684\u5206\u985e\u548c\u5b50\u5206\u985e\u3002<\/li>\n<li><strong>\u6587\u4ef6\u7cfb\u7d71<\/strong>: \u6a21\u64ec\u6587\u4ef6\u593e\u548c\u6587\u4ef6\u7684\u5c64\u6b21\u7d50\u69cb\uff0c\u4fbf\u65bc\u67e5\u8a62\u548c\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-PizQOiOhUl\">\u7e3d\u7d50<\/h2>\n<p>MSSQL\u7d50\u69cb\u6a39\u7684\u67e5\u8a62\u6280\u8853\u70ba\u6578\u64da\u7684\u5c64\u6b21\u7d50\u69cb\u7ba1\u7406\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u652f\u6301\u3002\u901a\u904e\u81ea\u5f15\u7528\u8868\u548c\u905e\u8ff4\u67e5\u8a62\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u67e5\u8a62\u548c\u7ba1\u7406\u8907\u96dc\u7684\u6578\u64da\u7d50\u69cb\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u67e5\u8a62\u7684\u6548\u7387\uff0c\u9084\u64f4\u5c55\u4e86\u6578\u64da\u5eab\u7684\u61c9\u7528\u7bc4\u570d\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u63d0\u5347\u696d\u52d9\u904b\u71df\u6548\u7387\u7684\u91cd\u8981\u4e00\u6b65\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MSSQL\u7d50\u69cb\u6a39\u67e5\u8a62\u6280\u8853\u53ca\u5176\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u5be6\u73fe\u9748\u6d3b\u7684\u6578\u64da\u6aa2\u7d22\u8207\u5206\u6790\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-65403","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/65403","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=65403"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/65403\/revisions"}],"predecessor-version":[{"id":65404,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/65403\/revisions\/65404"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=65403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=65403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=65403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}