{"id":186410,"date":"2024-11-11T05:41:20","date_gmt":"2024-11-10T21:41:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186410\/"},"modified":"2024-11-11T05:41:21","modified_gmt":"2024-11-10T21:41:21","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%a4%96%e7%a2%bc%e6%98%af%e4%bb%80%e9%ba%bc%ef%bc%9f%e5%88%9d%e5%ad%b8%e8%80%85%e5%bf%85%e9%a0%88%e8%a6%81%e7%9f%a5%e9%81%93%e7%9a%84%e7%9f%a5%e8%ad%98%e9%bb%9e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186410\/","title":{"rendered":"\u6578\u64da\u5eab\u7684\u5916\u78bc\u662f\u4ec0\u9ebc\uff1f\u521d\u5b78\u8005\u5fc5\u9808\u8981\u77e5\u9053\u7684\u77e5\u8b58\u9ede\uff08\u6578\u64da\u5eab\u5916\u78bc\u662f\u4ec0\u9ebc\uff09"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%a4%96%e7%a2%bc%e6%98%af%e4%bb%80%e9%ba%bc%ef%bc%9f%e5%88%9d%e5%ad%b8%e8%80%85%e5%bf%85%e9%a0%88%e8%a6%81%e7%9f%a5%e9%81%93%e7%9a%84%e7%9f%a5%e8%ad%98%e9%bb%9e-tcTGqrCFno\">\u6578\u64da\u5eab\u7684\u5916\u78bc\u662f\u4ec0\u9ebc\uff1f\u521d\u5b78\u8005\u5fc5\u9808\u8981\u77e5\u9053\u7684\u77e5\u8b58\u9ede<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u5916\u78bc\uff08Foreign Key\uff09\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5c0d\u65bc\u521d\u5b78\u8005\u4f86\u8aaa\uff0c\u7406\u89e3\u5916\u78bc\u7684\u5b9a\u7fa9\u3001\u529f\u80fd\u53ca\u5176\u5728\u6578\u64da\u5eab\u4e2d\u7684\u61c9\u7528\u662f\u975e\u5e38\u5fc5\u8981\u7684\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5916\u78bc\u7684\u57fa\u672c\u77e5\u8b58\uff0c\u5e6b\u52a9\u8b80\u8005\u5efa\u7acb\u5c0d\u9019\u4e00\u6982\u5ff5\u7684\u5168\u9762\u7406\u89e3\u3002<\/p>\n<h2 id=\"%e5%a4%96%e7%a2%bc%e7%9a%84%e5%ae%9a%e7%be%a9-tcTGqrCFno\">\u5916\u78bc\u7684\u5b9a\u7fa9<\/h2>\n<p>\u5916\u78bc\u662f\u6307\u5728\u4e00\u500b\u6578\u64da\u8868\u4e2d\uff0c\u5f15\u7528\u53e6\u4e00\u500b\u6578\u64da\u8868\u7684\u4e3b\u9375\uff08Primary Key\uff09\u7684\u4e00\u500b\u5b57\u6bb5\u3002\u5916\u78bc\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u5efa\u7acb\u5169\u500b\u8868\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u5f9e\u800c\u5be6\u73fe\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u7576\u4e00\u500b\u8868\u7684\u67d0\u500b\u5b57\u6bb5\u662f\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\u6642\uff0c\u9019\u500b\u5b57\u6bb5\u5c31\u88ab\u7a31\u70ba\u5916\u78bc\u3002<\/p>\n<h2 id=\"%e5%a4%96%e7%a2%bc%e7%9a%84%e5%8a%9f%e8%83%bd-tcTGqrCFno\">\u5916\u78bc\u7684\u529f\u80fd<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u5916\u78bc\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9632\u6b62\u51fa\u73fe\u5b64\u7acb\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u500b\u8a02\u55ae\u8868\u4e2d\u7684\u5ba2\u6236ID\u662f\u5916\u78bc\uff0c\u5247\u8a72ID\u5fc5\u9808\u5728\u5ba2\u6236\u8868\u4e2d\u5b58\u5728\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u8a02\u55ae\u6307\u5411\u4e0d\u5b58\u5728\u7684\u5ba2\u6236\u3002<\/li>\n<li><strong>\u6578\u64da\u95dc\u806f\uff1a<\/strong>\u5916\u78bc\u4f7f\u5f97\u4e0d\u540c\u8868\u4e4b\u9593\u53ef\u4ee5\u5efa\u7acb\u95dc\u806f\uff0c\u4fbf\u65bc\u9032\u884c\u806f\u5408\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u901a\u904e\u5916\u78bc\u67e5\u8a62\u67d0\u500b\u5ba2\u6236\u7684\u6240\u6709\u8a02\u55ae\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u7576\u4e3b\u8868\u4e2d\u7684\u6578\u64da\u767c\u751f\u8b8a\u5316\u6642\uff0c\u5916\u78bc\u53ef\u4ee5\u5e6b\u52a9\u4fdd\u6301\u5f9e\u8868\u4e2d\u7684\u6578\u64da\u4e00\u81f4\u6027\u3002\u4f8b\u5982\uff0c\u82e5\u5ba2\u6236\u7684ID\u66f4\u6539\uff0c\u5247\u6240\u6709\u5f15\u7528\u8a72ID\u7684\u8a02\u55ae\u4e5f\u9700\u8981\u76f8\u61c9\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a4%96%e7%a2%bc%e7%9a%84%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-tcTGqrCFno\">\u5916\u78bc\u7684\u4f7f\u7528\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u6578\u64da\u5eab\u8a2d\u8a08\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u5916\u78bc\u4f86\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002<\/p>\n<pre><code>\n-- \u5275\u5efa\u5ba2\u6236\u8868\nCREATE TABLE Customers (\n    CustomerID INT PRIMARY KEY,\n    CustomerName VARCHAR(100)\n);\n\n-- \u5275\u5efa\u8a02\u55ae\u8868\uff0c\u4e26\u5c07 CustomerID \u8a2d\u7f6e\u70ba\u5916\u78bc\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\u9019\u500b\u793a\u4f8b\u4e2d\uff0c<code>Customers<\/code> \u8868\u7684 <code>CustomerID<\/code> \u662f\u4e3b\u9375\uff0c\u800c <code>Orders<\/code> \u8868\u4e2d\u7684 <code>CustomerID<\/code> \u662f\u5916\u78bc\uff0c\u5f15\u7528\u4e86 <code>Customers<\/code> \u8868\u7684\u4e3b\u9375\u3002\u9019\u6a23\u8a2d\u8a08\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u4e00\u500b\u8a02\u55ae\u90fd\u5fc5\u9808\u5c0d\u61c9\u4e00\u500b\u5b58\u5728\u7684\u5ba2\u6236\u3002<\/p>\n<h2 id=\"%e5%a4%96%e7%a2%bc%e7%9a%84%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6-tcTGqrCFno\">\u5916\u78bc\u7684\u7d04\u675f\u689d\u4ef6<\/h2>\n<p>\u5728\u4f7f\u7528\u5916\u78bc\u6642\uff0c\u901a\u5e38\u6703\u8a2d\u7f6e\u4e00\u4e9b\u7d04\u675f\u689d\u4ef6\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u5e38\u898b\u7684\u7d04\u675f\u689d\u4ef6\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>CASCADE\uff1a<\/strong>\u7576\u4e3b\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u5f9e\u8868\u4e2d\u7684\u76f8\u95dc\u6578\u64da\u4e5f\u6703\u81ea\u52d5\u522a\u9664\u6216\u66f4\u65b0\u3002<\/li>\n<li><strong>SET NULL\uff1a<\/strong>\u7576\u4e3b\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u5f9e\u8868\u4e2d\u7684\u5916\u78bc\u5b57\u6bb5\u6703\u88ab\u8a2d\u7f6e\u70baNULL\u3002<\/li>\n<li><strong>NO ACTION\uff1a<\/strong>\u5982\u679c\u4e3b\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6216\u66f4\u65b0\uff0c\u800c\u5f9e\u8868\u4e2d\u4ecd\u6709\u5f15\u7528\uff0c\u5247\u64cd\u4f5c\u5c07\u88ab\u62d2\u7d55\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-tcTGqrCFno\">\u7e3d\u7d50<\/h2>\n<p>\u5916\u78bc\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\u548c\u4e00\u81f4\u6027\uff0c\u9084\u80fd\u5920\u6709\u6548\u5730\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u5c0d\u65bc\u521d\u5b78\u8005\u4f86\u8aaa\uff0c\u638c\u63e1\u5916\u78bc\u7684\u6982\u5ff5\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u662f\u5b78\u7fd2\u6578\u64da\u5eab\u8a2d\u8a08\u7684\u57fa\u790e\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u904b\u7528\u6709\u66f4\u6df1\u5165\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u9ad8\u6548\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u6578\u64da\u5eab\u5916\u78bc\u7684\u5b9a\u7fa9\u53ca\u5176\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u7684\u91cd\u8981\u6027\uff0c\u5e6b\u52a9\u521d\u5b78\u8005\u638c\u63e1\u95dc\u9375\u77e5\u8b58\u9ede\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-186410","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186410","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=186410"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186410\/revisions"}],"predecessor-version":[{"id":186411,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186410\/revisions\/186411"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}