{"id":75942,"date":"2024-10-16T02:31:15","date_gmt":"2024-10-15T18:31:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75942\/"},"modified":"2024-10-16T02:31:16","modified_gmt":"2024-10-15T18:31:16","slug":"mysql-%e5%ae%9a%e7%be%a9%e5%a4%96%e9%8d%b5%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75942\/","title":{"rendered":"MySQL \u5b9a\u7fa9\u5916\u9375\u7684\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"mysql-%e5%ae%9a%e7%be%a9%e5%a4%96%e9%8d%b5%e7%9a%84%e6%96%b9%e6%b3%95-UrWtNmndva\">MySQL \u5b9a\u7fa9\u5916\u9375\u7684\u65b9\u6cd5<\/h1>\n<p>\u5728\u95dc\u806f\u578b\u6578\u64da\u5eab\u4e2d\uff0c\u5916\u9375\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u7d04\u675f\u689d\u4ef6\uff0c\u7528\u65bc\u5efa\u7acb\u548c\u5f37\u5316\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002MySQL \u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u65b9\u5f0f\u4f86\u5b9a\u7fa9\u5916\u9375\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728 MySQL \u4e2d\u5b9a\u7fa9\u5916\u9375\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%a4%96%e9%8d%b5%ef%bc%9f-UrWtNmndva\">\u4ec0\u9ebc\u662f\u5916\u9375\uff1f<\/h2>\n<p>\u5916\u9375\u662f\u4e00\u500b\u8868\u4e2d\u7684\u4e00\u5217\u6216\u591a\u5217\uff0c\u5176\u503c\u5fc5\u9808\u5728\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\u4e2d\u5b58\u5728\u3002\u9019\u7a2e\u7d04\u675f\u78ba\u4fdd\u4e86\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9632\u6b62\u4e86\u7121\u6548\u6578\u64da\u7684\u63d2\u5165\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u201c\u8a02\u55ae\u201d\u8868\u548c\u4e00\u500b\u201c\u5ba2\u6236\u201d\u8868\uff0c\u8a02\u55ae\u8868\u4e2d\u7684\u201c\u5ba2\u6236ID\u201d\u53ef\u4ee5\u4f5c\u70ba\u5916\u9375\uff0c\u6307\u5411\u5ba2\u6236\u8868\u4e2d\u7684\u4e3b\u9375\u201cID\u201d\u3002<\/p>\n<h2 id=\"%e5%ae%9a%e7%be%a9%e5%a4%96%e9%8d%b5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-UrWtNmndva\">\u5b9a\u7fa9\u5916\u9375\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u5b9a\u7fa9\u5916\u9375\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE \u8868\u540d (\n    \u5217\u540d \u6578\u64da\u985e\u578b,\n    ...\n    FOREIGN KEY (\u5916\u9375\u5217\u540d) REFERENCES \u53c3\u8003\u8868\u540d (\u53c3\u8003\u5217\u540d)\n);<\/code><\/pre>\n<h2 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e5%b8%b6%e6%9c%89%e5%a4%96%e9%8d%b5%e7%9a%84%e8%a1%a8-UrWtNmndva\">\u793a\u4f8b\uff1a\u5275\u5efa\u5e36\u6709\u5916\u9375\u7684\u8868<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5177\u9ad4\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728 MySQL \u4e2d\u5275\u5efa\u5e36\u6709\u5916\u9375\u7684\u8868\uff1a<\/p>\n<pre><code>CREATE TABLE \u5ba2\u6236 (\n    ID INT AUTO_INCREMENT PRIMARY KEY,\n    \u59d3\u540d VARCHAR(100) NOT NULL\n);\n\nCREATE TABLE \u8a02\u55ae (\n    \u8a02\u55aeID INT AUTO_INCREMENT PRIMARY KEY,\n    \u5ba2\u6236ID INT,\n    \u8a02\u55ae\u65e5\u671f DATE,\n    FOREIGN KEY (\u5ba2\u6236ID) REFERENCES \u5ba2\u6236(ID)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5275\u5efa\u4e86\u4e00\u500b\u201c\u5ba2\u6236\u201d\u8868\uff0c\u7136\u5f8c\u5275\u5efa\u4e86\u4e00\u500b\u201c\u8a02\u55ae\u201d\u8868\uff0c\u5176\u4e2d\u7684\u201c\u5ba2\u6236ID\u201d\u5217\u4f5c\u70ba\u5916\u9375\uff0c\u53c3\u8003\u4e86\u201c\u5ba2\u6236\u201d\u8868\u4e2d\u7684\u201cID\u201d\u5217\u3002<\/p>\n<h2 id=\"%e6%b7%bb%e5%8a%a0%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f-UrWtNmndva\">\u6dfb\u52a0\u5916\u9375\u7d04\u675f<\/h2>\n<p>\u5982\u679c\u60a8\u5df2\u7d93\u5275\u5efa\u4e86\u8868\uff0c\u4f46\u5e0c\u671b\u5728\u5f8c\u671f\u6dfb\u52a0\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nADD CONSTRAINT \u7d04\u675f\u540d\nFOREIGN KEY (\u5916\u9375\u5217\u540d) REFERENCES \u53c3\u8003\u8868\u540d (\u53c3\u8003\u5217\u540d);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u5df2\u7d93\u5275\u5efa\u4e86\u201c\u8a02\u55ae\u201d\u8868\uff0c\u4f46\u6c92\u6709\u5b9a\u7fa9\u5916\u9375\uff0c\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u6dfb\u52a0\u5916\u9375\u7d04\u675f\uff1a<\/p>\n<pre><code>ALTER TABLE \u8a02\u55ae\nADD CONSTRAINT fk_\u5ba2\u6236\nFOREIGN KEY (\u5ba2\u6236ID) REFERENCES \u5ba2\u6236(ID);<\/code><\/pre>\n<h2 id=\"%e5%88%aa%e9%99%a4%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f-UrWtNmndva\">\u522a\u9664\u5916\u9375\u7d04\u675f<\/h2>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nDROP FOREIGN KEY \u7d04\u675f\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u522a\u9664\u201c\u8a02\u55ae\u201d\u8868\u4e2d\u7684\u5916\u9375\u7d04\u675f\uff1a<\/p>\n<pre><code>ALTER TABLE \u8a02\u55ae\nDROP FOREIGN KEY fk_\u5ba2\u6236;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-UrWtNmndva\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5916\u9375\u5217\u7684\u6578\u64da\u985e\u578b\u5fc5\u9808\u8207\u53c3\u8003\u5217\u7684\u6578\u64da\u985e\u578b\u76f8\u540c\u3002<\/li>\n<li>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u5916\u9375\u5217\u7684\u503c\u6642\uff0c\u5fc5\u9808\u78ba\u4fdd\u8a72\u503c\u5728\u53c3\u8003\u8868\u4e2d\u5b58\u5728\u3002<\/li>\n<li>\u5982\u679c\u53c3\u8003\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\uff0c\u5247\u9700\u8981\u8003\u616e\u5982\u4f55\u8655\u7406\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528 ON DELETE CASCADE \u6216 ON DELETE SET NULL \u7b49\u9078\u9805\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-UrWtNmndva\">\u7e3d\u7d50<\/h2>\n<p>\u5728 MySQL \u4e2d\u5b9a\u7fa9\u5916\u9375\u662f\u4e00\u500b\u91cd\u8981\u7684\u6b65\u9a5f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u6b63\u78ba\u5730\u4f7f\u7528\u5916\u9375\u7d04\u675f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\u6027\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u53ef\u9760\u6027\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684 MySQL \u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\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\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728 MySQL \u4e2d\u5b9a\u7fa9\u5916\u9375\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u4e26\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u7c21\u55ae\u6b65\u9a5f\uff0c\u8f15\u9b06\u4e0a\u624b\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-75942","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75942","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=75942"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75942\/revisions"}],"predecessor-version":[{"id":75943,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75942\/revisions\/75943"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75942"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75942"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}