{"id":188468,"date":"2024-11-11T22:59:23","date_gmt":"2024-11-11T14:59:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188468\/"},"modified":"2024-11-11T22:59:24","modified_gmt":"2024-11-11T14:59:24","slug":"%e6%8e%a2%e7%a9%b6%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a4%96%e9%8d%b5%e7%9a%84%e4%bd%9c%e7%94%a8%e5%92%8c%e5%af%a6%e7%8f%be%e6%96%b9%e5%bc%8f-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a4%96%e9%8d%b5%e6%98%af","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188468\/","title":{"rendered":"\u63a2\u7a76\u6578\u64da\u5eab\u5916\u9375\u7684\u4f5c\u7528\u548c\u5be6\u73fe\u65b9\u5f0f (\u6578\u64da\u5eab\u4e2d\u5916\u9375\u662f\u4ec0\u9ebc)"},"content":{"rendered":"<h1 id=\"%e6%8e%a2%e7%a9%b6%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a4%96%e9%8d%b5%e7%9a%84%e4%bd%9c%e7%94%a8%e5%92%8c%e5%af%a6%e7%8f%be%e6%96%b9%e5%bc%8f-fPlGfMQUmd\">\u63a2\u7a76\u6578\u64da\u5eab\u5916\u9375\u7684\u4f5c\u7528\u548c\u5be6\u73fe\u65b9\u5f0f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u5916\u9375\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u4e0d\u50c5\u6709\u52a9\u65bc\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u80fd\u5920\u4fc3\u9032\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5916\u9375\u7684\u5b9a\u7fa9\u3001\u4f5c\u7528\u4ee5\u53ca\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5be6\u73fe\u5916\u9375\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%a4%96%e9%8d%b5%ef%bc%9f-fPlGfMQUmd\">\u4ec0\u9ebc\u662f\u5916\u9375\uff1f<\/h2>\n<p>\u5916\u9375\uff08Foreign Key\uff09\u662f\u6307\u5728\u4e00\u500b\u6578\u64da\u8868\u4e2d\uff0c\u67d0\u4e00\u5217\u6216\u67d0\u5e7e\u5217\u7684\u503c\u5fc5\u9808\u4f86\u81ea\u53e6\u4e00\u500b\u6578\u64da\u8868\u7684\u4e3b\u9375\uff08Primary Key\uff09\u6216\u552f\u4e00\u9375\uff08Unique Key\uff09\u3002\u9019\u7a2e\u95dc\u806f\u6027\u4f7f\u5f97\u6578\u64da\u5eab\u80fd\u5920\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e4%bd%9c%e7%94%a8-fPlGfMQUmd\">\u5916\u9375\u7684\u4f5c\u7528<\/h2>\n<ul>\n<li><strong>\u7dad\u8b77\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u5916\u9375\u53ef\u4ee5\u9632\u6b62\u5728\u4e3b\u8868\u4e2d\u4e0d\u5b58\u5728\u7684\u6578\u64da\u88ab\u63d2\u5165\u5230\u5b50\u8868\u4e2d\uff0c\u5f9e\u800c\u4fdd\u8b49\u6578\u64da\u7684\u6b63\u78ba\u6027\u3002<\/li>\n<li><strong>\u4fc3\u9032\u6578\u64da\u95dc\u806f\uff1a<\/strong>\u901a\u904e\u5916\u9375\uff0c\u6578\u64da\u5eab\u80fd\u5920\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u9019\u5c0d\u65bc\u9032\u884c\u8907\u96dc\u67e5\u8a62\u548c\u5831\u544a\u81f3\u95dc\u91cd\u8981\u3002<\/li>\n<li><strong>\u652f\u6301\u7d1a\u806f\u64cd\u4f5c\uff1a<\/strong>\u5916\u9375\u53ef\u4ee5\u8a2d\u7f6e\u7d1a\u806f\u522a\u9664\u6216\u66f4\u65b0\uff0c\u9019\u610f\u5473\u8457\u7576\u4e3b\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u76f8\u95dc\u7684\u5b50\u8868\u6578\u64da\u4e5f\u6703\u81ea\u52d5\u66f4\u65b0\u6216\u522a\u9664\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e5%af%a6%e7%8f%be%e6%96%b9%e5%bc%8f-fPlGfMQUmd\">\u5916\u9375\u7684\u5be6\u73fe\u65b9\u5f0f<\/h2>\n<p>\u5728\u5927\u591a\u6578\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08RDBMS\uff09\u4e2d\uff0c\u5be6\u73fe\u5916\u9375\u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 SQL \u8a9e\u8a00\u5275\u5efa\u5916\u9375\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e4%b8%bb%e8%a1%a8-fPlGfMQUmd\">1. \u5275\u5efa\u4e3b\u8868<\/h3>\n<pre><code>\nCREATE TABLE Customers (\n    CustomerID INT PRIMARY KEY,\n    CustomerName VARCHAR(100)\n);\n<\/code><\/pre>\n<h3 id=\"2-%e5%89%b5%e5%bb%ba%e5%ad%90%e8%a1%a8%e4%b8%a6%e8%a8%ad%e7%bd%ae%e5%a4%96%e9%8d%b5-fPlGfMQUmd\">2. \u5275\u5efa\u5b50\u8868\u4e26\u8a2d\u7f6e\u5916\u9375<\/h3>\n<pre><code>\nCREATE TABLE Orders (\n    OrderID INT PRIMARY KEY,\n    OrderDate DATE,\n    CustomerID INT,\n    FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)\n);\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c<code>Customers<\/code> \u8868\u662f\u4e3b\u8868\uff0c<code>Orders<\/code> \u8868\u662f\u5b50\u8868\u3002<code>CustomerID<\/code> \u5217\u5728 <code>Orders<\/code> \u8868\u4e2d\u4f5c\u70ba\u5916\u9375\uff0c\u5f15\u7528\u4e86 <code>Customers<\/code> \u8868\u4e2d\u7684\u4e3b\u9375\u3002<\/p>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6-fPlGfMQUmd\">\u5916\u9375\u7684\u7d04\u675f\u689d\u4ef6<\/h2>\n<p>\u5728\u8a2d\u7f6e\u5916\u9375\u6642\uff0c\u53ef\u4ee5\u6307\u5b9a\u4e00\u4e9b\u7d04\u675f\u689d\u4ef6\uff0c\u4ee5\u9032\u4e00\u6b65\u63a7\u5236\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u5e38\u898b\u7684\u7d04\u675f\u689d\u4ef6\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>ON DELETE CASCADE\uff1a<\/strong>\u7576\u4e3b\u8868\u4e2d\u7684\u8a18\u9304\u88ab\u522a\u9664\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u8a18\u9304\u7684\u5b50\u8868\u8a18\u9304\u4e5f\u6703\u81ea\u52d5\u522a\u9664\u3002<\/li>\n<li><strong>ON UPDATE CASCADE\uff1a<\/strong>\u7576\u4e3b\u8868\u4e2d\u7684\u8a18\u9304\u88ab\u66f4\u65b0\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u8a18\u9304\u7684\u5b50\u8868\u8a18\u9304\u4e5f\u6703\u81ea\u52d5\u66f4\u65b0\u3002<\/li>\n<li><strong>ON DELETE SET NULL\uff1a<\/strong>\u7576\u4e3b\u8868\u4e2d\u7684\u8a18\u9304\u88ab\u522a\u9664\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u8a18\u9304\u7684\u5b50\u8868\u8a18\u9304\u4e2d\u7684\u5916\u9375\u503c\u6703\u88ab\u8a2d\u7f6e\u70ba NULL\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-fPlGfMQUmd\">\u7d50\u8ad6<\/h2>\n<p>\u5916\u9375\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5b83\u4e0d\u50c5\u6709\u52a9\u65bc\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u80fd\u5920\u4fc3\u9032\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\u3002\u901a\u904e\u5408\u7406\u5730\u4f7f\u7528\u5916\u9375\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u4e26\u7c21\u5316\u6578\u64da\u7684\u7ba1\u7406\u548c\u67e5\u8a62\u904e\u7a0b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u8a2d\u8a08\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\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>\u63a2\u7a76\u6578\u64da\u5eab\u5916\u9375\u7684\u4f5c\u7528\u53ca\u5be6\u73fe\u65b9\u5f0f\uff0c\u4e86\u89e3\u5916\u9375\u5728\u6578\u64da\u5eab\u4e2d\u7684\u5b9a\u7fa9\u3001\u529f\u80fd\u53ca\u5176\u5c0d\u6578\u64da\u5b8c\u6574\u6027\u7684\u5f71\u97ff\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-188468","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188468","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=188468"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188468\/revisions"}],"predecessor-version":[{"id":188469,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188468\/revisions\/188469"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188468"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188468"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188468"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}