{"id":187724,"date":"2024-11-11T16:39:20","date_gmt":"2024-11-11T08:39:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187724\/"},"modified":"2024-11-11T16:39:22","modified_gmt":"2024-11-11T08:39:22","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%8f%83%e7%85%a7%e8%a8%ad%e7%bd%ae%e8%a9%b3%e8%a7%a3%ef%bc%8c%e5%8a%a9%e4%bd%a0%e8%bc%95%e9%ac%86%e6%8e%8c%e6%8f%a1%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187724\/","title":{"rendered":"\u6578\u64da\u5eab\u4e2d\u7684\u53c3\u7167\u8a2d\u7f6e\u8a73\u89e3\uff0c\u52a9\u4f60\u8f15\u9b06\u638c\u63e1\u6578\u64da\u8655\u7406\u6280\u5de7\uff01 (\u6578\u64da\u5eab \u53c3\u7167\u8a2d\u7f6e)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%8f%83%e7%85%a7%e8%a8%ad%e7%bd%ae%e8%a9%b3%e8%a7%a3%ef%bc%8c%e5%8a%a9%e4%bd%a0%e8%bc%95%e9%ac%86%e6%8e%8c%e6%8f%a1%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86-GnoKRbiEvN\">\u6578\u64da\u5eab\u4e2d\u7684\u53c3\u7167\u8a2d\u7f6e\u8a73\u89e3\uff0c\u52a9\u4f60\u8f15\u9b06\u638c\u63e1\u6578\u64da\u8655\u7406\u6280\u5de7\uff01<\/h1>\n<p>\u5728\u73fe\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u8207\u7ba1\u7406\u8b8a\u5f97\u6108\u52a0\u91cd\u8981\u3002\u53c3\u7167\u8a2d\u7f6e\uff08Foreign Key Constraints\uff09\u662f\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u7684\u4e00\u500b\u95dc\u9375\u6982\u5ff5\uff0c\u5b83\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u53c3\u7167\u8a2d\u7f6e\u7684\u57fa\u672c\u6982\u5ff5\u3001\u5be6\u73fe\u65b9\u5f0f\u53ca\u5176\u5728\u6578\u64da\u8655\u7406\u4e2d\u7684\u61c9\u7528\u6280\u5de7\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%8f%83%e7%85%a7%e8%a8%ad%e7%bd%ae%ef%bc%9f-GnoKRbiEvN\">\u4ec0\u9ebc\u662f\u53c3\u7167\u8a2d\u7f6e\uff1f<\/h2>\n<p>\u53c3\u7167\u8a2d\u7f6e\u662f\u4e00\u7a2e\u7d04\u675f\u689d\u4ef6\uff0c\u7528\u65bc\u78ba\u4fdd\u6578\u64da\u5eab\u4e2d\u5169\u500b\u8868\u4e4b\u9593\u7684\u95dc\u806f\u6027\u3002\u5177\u9ad4\u4f86\u8aaa\uff0c\u7576\u4e00\u500b\u8868\u4e2d\u7684\u67d0\u500b\u5b57\u6bb5\uff08\u5916\u9375\uff09\u5f15\u7528\u53e6\u4e00\u500b\u8868\u4e2d\u7684\u4e3b\u9375\u6642\uff0c\u9019\u7a2e\u95dc\u806f\u5c31\u7a31\u70ba\u53c3\u7167\u8a2d\u7f6e\u3002\u9019\u6a23\u7684\u8a2d\u7f6e\u53ef\u4ee5\u9632\u6b62\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u767c\u751f\uff0c\u4f8b\u5982\uff0c\u9632\u6b62\u5728\u5b50\u8868\u4e2d\u51fa\u73fe\u4e0d\u5b58\u5728\u65bc\u7236\u8868\u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e5%8f%83%e7%85%a7%e8%a8%ad%e7%bd%ae%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-GnoKRbiEvN\">\u53c3\u7167\u8a2d\u7f6e\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u5275\u5efa\u53c3\u7167\u8a2d\u7f6e\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE \u5b50\u8868 (\n    id INT PRIMARY KEY,\n    \u7236\u8868_id INT,\n    FOREIGN KEY (\u7236\u8868_id) REFERENCES \u7236\u8868(id)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5b50\u8868\u4e2d\u7684 <code>\u7236\u8868_id<\/code> \u5b57\u6bb5\u662f\u5916\u9375\uff0c\u5f15\u7528\u4e86\u7236\u8868\u4e2d\u7684 <code>id<\/code> \u5b57\u6bb5\u3002\u9019\u6a23\u7684\u8a2d\u7f6e\u78ba\u4fdd\u4e86\u5b50\u8868\u4e2d\u7684\u6bcf\u4e00\u689d\u8a18\u9304\u90fd\u5fc5\u9808\u5c0d\u61c9\u5230\u7236\u8868\u4e2d\u7684\u4e00\u689d\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e5%8f%83%e7%85%a7%e8%a8%ad%e7%bd%ae%e7%9a%84%e9%a1%9e%e5%9e%8b-GnoKRbiEvN\">\u53c3\u7167\u8a2d\u7f6e\u7684\u985e\u578b<\/h2>\n<ul>\n<li><strong>CASCADE\uff1a<\/strong>\u7576\u7236\u8868\u4e2d\u7684\u8a18\u9304\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u5b50\u8868\u4e2d\u5c0d\u61c9\u7684\u8a18\u9304\u4e5f\u6703\u81ea\u52d5\u522a\u9664\u6216\u66f4\u65b0\u3002<\/li>\n<li><strong>SET NULL\uff1a<\/strong>\u7576\u7236\u8868\u4e2d\u7684\u8a18\u9304\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u5b50\u8868\u4e2d\u5c0d\u61c9\u7684\u5916\u9375\u5b57\u6bb5\u6703\u88ab\u8a2d\u7f6e\u70ba NULL\u3002<\/li>\n<li><strong>NO ACTION\uff1a<\/strong>\u5982\u679c\u7236\u8868\u4e2d\u7684\u8a18\u9304\u88ab\u522a\u9664\u6216\u66f4\u65b0\uff0c\u800c\u5b50\u8868\u4e2d\u4ecd\u6709\u5c0d\u61c9\u7684\u8a18\u9304\uff0c\u5247\u64cd\u4f5c\u6703\u88ab\u62d2\u7d55\u3002<\/li>\n<li><strong>SET DEFAULT\uff1a<\/strong>\u7576\u7236\u8868\u4e2d\u7684\u8a18\u9304\u88ab\u522a\u9664\u6216\u66f4\u65b0\u6642\uff0c\u5b50\u8868\u4e2d\u5c0d\u61c9\u7684\u5916\u9375\u5b57\u6bb5\u6703\u88ab\u8a2d\u7f6e\u70ba\u9810\u8a2d\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%8f%83%e7%85%a7%e8%a8%ad%e7%bd%ae%e7%9a%84%e5%84%aa%e5%8b%a2-GnoKRbiEvN\">\u53c3\u7167\u8a2d\u7f6e\u7684\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528\u53c3\u7167\u8a2d\u7f6e\u7684\u4e3b\u8981\u512a\u52e2\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u78ba\u4fdd\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\uff0c\u907f\u514d\u5b64\u7acb\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u81ea\u52d5\u5316\u7ba1\u7406\uff1a<\/strong>\u901a\u904e\u8a2d\u7f6e\u81ea\u52d5\u8655\u7406\u522a\u9664\u548c\u66f4\u65b0\u64cd\u4f5c\uff0c\u6e1b\u5c11\u624b\u52d5\u7dad\u8b77\u7684\u5de5\u4f5c\u91cf\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff1a<\/strong>\u901a\u904e\u660e\u78ba\u7684\u95dc\u806f\u6027\uff0c\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e6%a1%88%e4%be%8b-GnoKRbiEvN\">\u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u7cfb\u7d71\uff0c\u5176\u4e2d\u6709\u5169\u500b\u8868\uff1a<code>Customers<\/code>\uff08\u9867\u5ba2\uff09\u548c <code>Orders<\/code>\uff08\u8a02\u55ae\uff09\u3002\u6211\u5011\u5e0c\u671b\u78ba\u4fdd\u6bcf\u4e00\u500b\u8a02\u55ae\u90fd\u5fc5\u9808\u5c0d\u61c9\u5230\u4e00\u4f4d\u9867\u5ba2\u3002\u53ef\u4ee5\u9019\u6a23\u8a2d\u7f6e\u53c3\u7167\uff1a<\/p>\n<pre><code>CREATE TABLE Customers (\n    CustomerID INT PRIMARY KEY,\n    CustomerName VARCHAR(100)\n);\n\nCREATE 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>\u9019\u6a23\u7684\u8a2d\u7f6e\u78ba\u4fdd\u4e86\u6bcf\u4e00\u500b\u8a02\u55ae\u90fd\u5fc5\u9808\u6709\u4e00\u4f4d\u9867\u5ba2\uff0c\u5f9e\u800c\u7dad\u8b77\u4e86\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-GnoKRbiEvN\">\u7e3d\u7d50<\/h2>\n<p>\u53c3\u7167\u8a2d\u7f6e\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5b83\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002\u901a\u904e\u5408\u7406\u7684\u8a2d\u7f6e\uff0c\u6211\u5011\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\uff0c\u5f9e\u800c\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u554f\u984c\u3002\u5c0d\u65bc\u5e0c\u671b\u63d0\u5347\u6578\u64da\u7ba1\u7406\u80fd\u529b\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u638c\u63e1\u53c3\u7167\u8a2d\u7f6e\u7684\u6280\u5de7\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u4f60\u7684\u6578\u64da\u8655\u7406\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u4e86\u89e3\u6578\u64da\u5eab\u4e2d\u7684\u53c3\u7167\u8a2d\u7f6e\uff0c\u638c\u63e1\u6578\u64da\u8655\u7406\u6280\u5de7\uff0c\u63d0\u5347\u4f60\u7684\u6578\u64da\u7ba1\u7406\u80fd\u529b\uff0c\u8b93\u5de5\u4f5c\u66f4\u9ad8\u6548\uff01<\/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-187724","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187724","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=187724"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187724\/revisions"}],"predecessor-version":[{"id":187725,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187724\/revisions\/187725"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187724"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187724"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187724"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}