{"id":166941,"date":"2024-11-05T20:59:19","date_gmt":"2024-11-05T12:59:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/166941\/"},"modified":"2024-11-05T20:59:20","modified_gmt":"2024-11-05T12:59:20","slug":"%e7%90%86%e6%b8%85mysql%e5%a4%96%e9%8f%88%e7%9a%84%e5%90%ab%e7%be%a9%e5%92%8c%e5%91%bd%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/166941\/","title":{"rendered":"\u7406\u6e05mysql\u5916\u93c8\u7684\u542b\u7fa9\u548c\u547d\u4ee4"},"content":{"rendered":"<h1 id=\"%e7%90%86%e6%b8%85mysql%e5%a4%96%e9%8f%88%e7%9a%84%e5%90%ab%e7%be%a9%e5%92%8c%e5%91%bd%e4%bb%a4-hUpyRxXXPP\">\u7406\u6e05MySQL\u5916\u93c8\u7684\u542b\u7fa9\u548c\u547d\u4ee4<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cMySQL\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u7576\u6211\u5011\u8ac7\u8ad6MySQL\u7684\u5916\u93c8\uff08Foreign Key\uff09\u6642\uff0c\u9019\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u56e0\u70ba\u5b83\u6d89\u53ca\u5230\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u95dc\u806f\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u5916\u93c8\u7684\u542b\u7fa9\u3001\u7528\u9014\u4ee5\u53ca\u76f8\u95dc\u547d\u4ee4\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%a4%96%e9%8f%88%ef%bc%9f-hUpyRxXXPP\">\u4ec0\u9ebc\u662f\u5916\u93c8\uff1f<\/h2>\n<p>\u5916\u93c8\u662f\u4e00\u7a2e\u7d04\u675f\uff0c\u7528\u65bc\u5728\u5169\u500b\u8868\u4e4b\u9593\u5efa\u7acb\u95dc\u806f\u3002\u5b83\u78ba\u4fdd\u4e00\u500b\u8868\u4e2d\u7684\u67d0\u500b\u5b57\u6bb5\uff08\u5916\u9375\uff09\u5fc5\u9808\u8207\u53e6\u4e00\u500b\u8868\u4e2d\u7684\u4e3b\u9375\u76f8\u5339\u914d\u3002\u9019\u6a23\u7684\u8a2d\u8a08\u53ef\u4ee5\u9632\u6b62\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u767c\u751f\uff0c\u4e26\u4fdd\u6301\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>users<\/code>\u548c<code>orders<\/code>\u3002\u5728<code>orders<\/code>\u8868\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u8a2d\u7f6e\u4e00\u500b\u5916\u9375\uff0c\u6307\u5411<code>users<\/code>\u8868\u4e2d\u7684\u4e3b\u9375\uff0c\u9019\u6a23\u6bcf\u4e00\u500b\u8a02\u55ae\u90fd\u5fc5\u9808\u8207\u4e00\u500b\u6709\u6548\u7684\u7528\u6236\u76f8\u95dc\u806f\u3002<\/p>\n<h2 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id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e5%a4%96%e9%8f%88-hUpyRxXXPP\">\u5982\u4f55\u5275\u5efa\u5916\u93c8<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u5275\u5efa\u5916\u93c8\u901a\u5e38\u662f\u5728\u5275\u5efa\u8868\u6642\u9032\u884c\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728\u5275\u5efa\u8868\u6642\u8a2d\u7f6e\u5916\u9375\uff1a<\/p>\n<pre><code>\nCREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL\n);\n\nCREATE TABLE orders (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    user_id INT,\n    order_date DATETIME,\n    FOREIGN KEY (user_id) REFERENCES users(id)\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>orders<\/code>\u8868\u4e2d\u7684<code>user_id<\/code>\u5b57\u6bb5\u662f\u5916\u9375\uff0c\u6307\u5411<code>users<\/code>\u8868\u4e2d\u7684<code>id<\/code>\u5b57\u6bb5\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u4e00\u500b\u8a02\u55ae\u90fd\u5fc5\u9808\u8207\u4e00\u500b\u6709\u6548\u7684\u7528\u6236\u76f8\u95dc\u806f\u3002<\/p>\n<h2 id=\"%e6%b7%bb%e5%8a%a0%e5%92%8c%e5%88%aa%e9%99%a4%e5%a4%96%e9%8f%88-hUpyRxXXPP\">\u6dfb\u52a0\u548c\u522a\u9664\u5916\u93c8<\/h2>\n<p>\u5982\u679c\u9700\u8981\u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u6dfb\u52a0\u5916\u9375\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>\nALTER TABLE orders\nADD CONSTRAINT fk_user\nFOREIGN KEY (user_id) REFERENCES users(id);\n<\/code><\/pre>\n<p>\u8981\u522a\u9664\u5916\u9375\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>\nALTER TABLE orders\nDROP FOREIGN KEY fk_user;\n<\/code><\/pre>\n<h2 id=\"%e5%a4%96%e9%8f%88%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-hUpyRxXXPP\">\u5916\u93c8\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u5916\u93c8\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li>\u5916\u9375\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\u5fc5\u9808\u8207\u4e3b\u9375\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\u76f8\u540c\u3002<\/li>\n<li>\u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u5fc5\u9808\u78ba\u4fdd\u5916\u9375\u5b57\u6bb5\u7684\u503c\u5b58\u5728\u65bc\u4e3b\u9375\u5b57\u6bb5\u4e2d\u3002<\/li>\n<li>\u5728\u522a\u9664\u6216\u66f4\u65b0\u4e3b\u9375\u5b57\u6bb5\u7684\u6578\u64da\u6642\uff0c\u5fc5\u9808\u8003\u616e\u5916\u9375\u7684\u7d04\u675f\u884c\u70ba\uff0c\u4ee5\u907f\u514d\u9055\u53cd\u6578\u64da\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-hUpyRxXXPP\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684\u5916\u93c8\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7528\u65bc\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u95dc\u806f\u6027\u3002\u901a\u904e\u6b63\u78ba\u5730\u4f7f\u7528\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u53ef\u9760\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\uff0c\u7406\u89e3\u548c\u4f7f\u7528\u5916\u93c8\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u5916\u94fe\u7684\u5b9a\u4e49\u53ca\u5176\u76f8\u5173\u547d\u4ee4\uff0c\u638c\u63e1\u5982\u4f55\u5728\u6570\u636e\u5e93\u4e2d\u6709\u6548\u7ba1\u7406\u548c\u4f7f\u7528\u5916\u90e8\u94fe\u63a5\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-166941","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166941","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=166941"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166941\/revisions"}],"predecessor-version":[{"id":166942,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166941\/revisions\/166942"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=166941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=166941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=166941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}