{"id":162687,"date":"2024-11-04T17:10:18","date_gmt":"2024-11-04T09:10:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162687\/"},"modified":"2024-11-04T17:10:19","modified_gmt":"2024-11-04T09:10:19","slug":"%e5%bb%ba%e7%ab%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b9%8b%e9%96%93%e7%9a%84%e5%a4%96%e9%8d%b5%e9%97%9c%e4%bf%82%ef%bc%9a%e8%a9%b3%e8%a7%a3-%e6%80%8e%e9%ba%bc%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162687\/","title":{"rendered":"\u5efa\u7acb\u6578\u64da\u5eab\u8868\u4e4b\u9593\u7684\u5916\u9375\u95dc\u4fc2\uff1a\u8a73\u89e3 (\u600e\u9ebc\u5728\u6578\u64da\u5eab\u4e2d\u5efa\u7acb\u8868\u7684\u5916\u9375\u95dc\u4fc2)"},"content":{"rendered":"<h1 id=\"%e5%bb%ba%e7%ab%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b9%8b%e9%96%93%e7%9a%84%e5%a4%96%e9%8d%b5%e9%97%9c%e4%bf%82%ef%bc%9a%e8%a9%b3%e8%a7%a3-WRRDrulaKN\">\u5efa\u7acb\u6578\u64da\u5eab\u8868\u4e4b\u9593\u7684\u5916\u9375\u95dc\u4fc2\uff1a\u8a73\u89e3<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u5916\u9375\uff08Foreign Key\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u7528\u65bc\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\u6027\u3002\u5916\u9375\u662f\u4e00\u500b\u8868\u4e2d\u7684\u5b57\u6bb5\uff0c\u5b83\u6307\u5411\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\uff0c\u5f9e\u800c\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5efa\u7acb\u8868\u7684\u5916\u9375\u95dc\u4fc2\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 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id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%a4%96%e9%8d%b5%ef%bc%9f-WRRDrulaKN\">\u70ba\u4ec0\u9ebc\u9700\u8981\u5916\u9375\uff1f<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u5916\u9375\u53ef\u4ee5\u9632\u6b62\u63d2\u5165\u4e0d\u6b63\u78ba\u7684\u6578\u64da\uff0c\u78ba\u4fdd\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u901a\u904e\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u78ba\u4fdd\u5728\u522a\u9664\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u76f8\u95dc\u7684\u6578\u64da\u4e5f\u6703\u81ea\u52d5\u66f4\u65b0\u6216\u522a\u9664\u3002<\/li>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u5916\u9375\u95dc\u4fc2\u4f7f\u5f97\u5728\u67e5\u8a62\u6642\u53ef\u4ee5\u8f15\u9b06\u5730\u806f\u63a5\u591a\u500b\u8868\uff0c\u5f9e\u800c\u7372\u53d6\u66f4\u5168\u9762\u7684\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%bb%ba%e7%ab%8b%e5%a4%96%e9%8d%b5%e9%97%9c%e4%bf%82-WRRDrulaKN\">\u5982\u4f55\u5efa\u7acb\u5916\u9375\u95dc\u4fc2<\/h2>\n<p>\u5728\u5efa\u7acb\u5916\u9375\u95dc\u4fc2\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u6709\u5169\u500b\u8868\uff1a\u4e00\u500b\u4e3b\u8868\uff08Parent Table\uff09\u548c\u4e00\u500b\u5b50\u8868\uff08Child Table\uff09\u3002\u4e3b\u8868\u5305\u542b\u4e3b\u9375\uff0c\u800c\u5b50\u8868\u5247\u5305\u542b\u5916\u9375\u3002\u4ee5\u4e0b\u662f\u5efa\u7acb\u5916\u9375\u95dc\u4fc2\u7684\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f-1%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%bb%e8%a1%a8-WRRDrulaKN\">\u6b65\u9a5f 1\uff1a\u5275\u5efa\u4e3b\u8868<\/h3>\n<pre><code>CREATE TABLE Customers (\n    CustomerID INT PRIMARY KEY,\n    CustomerName VARCHAR(100)\n);<\/code><\/pre>\n<h3 id=\"%e6%ad%a5%e9%a9%9f-2%ef%bc%9a%e5%89%b5%e5%bb%ba%e5%ad%90%e8%a1%a8%e4%b8%a6%e6%b7%bb%e5%8a%a0%e5%a4%96%e9%8d%b5-WRRDrulaKN\">\u6b65\u9a5f 2\uff1a\u5275\u5efa\u5b50\u8868\u4e26\u6dfb\u52a0\u5916\u9375<\/h3>\n<pre><code>CREATE TABLE Orders (\n    OrderID INT PRIMARY KEY,\n    OrderDate DATE,\n    CustomerID INT,\n    FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)\n);<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>Customers<\/code> \u7684\u4e3b\u8868\uff0c\u4e26\u5728 <code>Orders<\/code> \u5b50\u8868\u4e2d\u6dfb\u52a0\u4e86\u4e00\u500b\u5916\u9375 <code>CustomerID<\/code>\uff0c\u8a72\u5916\u9375\u53c3\u8003\u4e86\u4e3b\u8868\u4e2d\u7684 <code>CustomerID<\/code>\u3002<\/p>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f%e7%9a%84%e9%81%b8%e9%a0%85-WRRDrulaKN\">\u5916\u9375\u7d04\u675f\u7684\u9078\u9805<\/h2>\n<p>\u5728\u5b9a\u7fa9\u5916\u9375\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u9078\u9805\u4f86\u63a7\u5236\u5916\u9375\u7684\u884c\u70ba\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\u4e3b\u9375\u88ab\u66f4\u65b0\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u4e3b\u9375\u7684\u5b50\u8868\u8a18\u9304\u4e5f\u6703\u81ea\u52d5\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e4%bd%bf%e7%94%a8%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f%e9%81%b8%e9%a0%85-WRRDrulaKN\">\u793a\u4f8b\uff1a\u4f7f\u7528\u5916\u9375\u7d04\u675f\u9078\u9805<\/h3>\n<pre><code>CREATE TABLE Orders (\n    OrderID INT PRIMARY KEY,\n    OrderDate DATE,\n    CustomerID INT,\n    FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)\n    ON DELETE CASCADE\n    ON UPDATE CASCADE\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u7576 <code>Customers<\/code> \u8868\u4e2d\u7684\u67d0\u500b\u5ba2\u6236\u88ab\u522a\u9664\u6642\uff0c\u6240\u6709\u8207\u8a72\u5ba2\u6236\u76f8\u95dc\u7684\u8a02\u55ae\u4e5f\u6703\u88ab\u81ea\u52d5\u522a\u9664\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-WRRDrulaKN\">\u7d50\u8ad6<\/h2>\n<p>\u5916\u9375\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5b83\u4e0d\u50c5\u80fd\u5920\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\uff0c\u9084\u80fd\u7c21\u5316\u6578\u64da\u67e5\u8a62\u7684\u904e\u7a0b\u3002\u901a\u904e\u6b63\u78ba\u5730\u8a2d\u7f6e\u5916\u9375\u95dc\u4fc2\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u5f9e\u800c\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u5916\u9375\u95dc\u4fc2\uff0c\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u8207\u5b8c\u6574\u6027\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-162687","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162687","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=162687"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162687\/revisions"}],"predecessor-version":[{"id":162688,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162687\/revisions\/162688"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162687"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162687"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162687"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}