{"id":191338,"date":"2024-11-12T16:35:22","date_gmt":"2024-11-12T08:35:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/191338\/"},"modified":"2024-11-12T16:35:24","modified_gmt":"2024-11-12T08:35:24","slug":"%e8%a9%b3%e8%a7%a3mysql%e5%a4%96%e9%8d%b5%e8%a8%ad%e7%bd%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/191338\/","title":{"rendered":"\u8a73\u89e3MySQL\u5916\u9375\u8a2d\u7f6e"},"content":{"rendered":"<h1 id=\"%e8%a9%b3%e8%a7%a3mysql%e5%a4%96%e9%8d%b5%e8%a8%ad%e7%bd%ae-SzrLsJDMjZ\">\u8a73\u89e3MySQL\u5916\u9375\u8a2d\u7f6e<\/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\u5916\u9375\u8a2d\u7f6e\u529f\u80fd\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u5916\u9375\u7684\u6982\u5ff5\u3001\u8a2d\u7f6e\u65b9\u6cd5\u53ca\u5176\u5728\u6578\u64da\u5b8c\u6574\u6027\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%a4%96%e9%8d%b5%ef%bc%9f-SzrLsJDMjZ\">\u4ec0\u9ebc\u662f\u5916\u9375\uff1f<\/h2>\n<p>\u5916\u9375\u662f\u6307\u4e00\u500b\u8868\u4e2d\u7684\u5b57\u6bb5\uff0c\u5b83\u5f15\u7528\u4e86\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\u3002\u9019\u7a2e\u95dc\u806f\u4f7f\u5f97\u6578\u64da\u5eab\u80fd\u5920\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u5169\u500b\u8868\uff1a<code>customers<\/code>\uff08\u5ba2\u6236\uff09\u548c<code>orders<\/code>\uff08\u8a02\u55ae\uff09\u3002\u5728<code>orders<\/code>\u8868\u4e2d\uff0c\u53ef\u4ee5\u8a2d\u7f6e\u4e00\u500b\u5916\u9375\u4f86\u5f15\u7528<code>customers<\/code>\u8868\u7684\u4e3b\u9375\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u500b\u8a02\u55ae\u90fd\u5c0d\u61c9\u4e00\u500b\u6709\u6548\u7684\u5ba2\u6236\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e4%bd%bf%e7%94%a8%e5%a4%96%e9%8d%b5%ef%bc%9f-SzrLsJDMjZ\">\u70ba\u4ec0\u9ebc\u4f7f\u7528\u5916\u9375\uff1f<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u5916\u9375\u7d04\u675f\u53ef\u4ee5\u9632\u6b62\u63d2\u5165\u4e0d\u5408\u6cd5\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u7121\u6cd5\u5728<code>orders<\/code>\u8868\u4e2d\u63d2\u5165\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u5ba2\u6236ID\u3002<\/li>\n<li><strong>\u81ea\u52d5\u66f4\u65b0\u548c\u522a\u9664\uff1a<\/strong>\u901a\u904e\u8a2d\u7f6e\u5916\u9375\uff0c\u53ef\u4ee5\u81ea\u52d5\u8655\u7406\u76f8\u95dc\u6578\u64da\u7684\u66f4\u65b0\u548c\u522a\u9664\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u624b\u52d5\u7dad\u8b77\u7684\u5de5\u4f5c\u91cf\u3002<\/li>\n<li><strong>\u6578\u64da\u95dc\u806f\u6027\uff1a<\/strong>\u5916\u9375\u5e6b\u52a9\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u4f7f\u5f97\u6578\u64da\u67e5\u8a62\u66f4\u52a0\u9ad8\u6548\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e8%a8%ad%e7%bd%ae%e5%a4%96%e9%8d%b5%ef%bc%9f-SzrLsJDMjZ\">\u5982\u4f55\u8a2d\u7f6e\u5916\u9375\uff1f<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u8a2d\u7f6e\u5916\u9375\u901a\u5e38\u5728\u5275\u5efa\u8868\u6642\u9032\u884c\uff0c\u4e5f\u53ef\u4ee5\u5728\u8868\u5df2\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u9032\u884c\u4fee\u6539\u3002\u4ee5\u4e0b\u662f\u8a2d\u7f6e\u5916\u9375\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e8%a1%a8%e6%99%82%e8%a8%ad%e7%bd%ae%e5%a4%96%e9%8d%b5-SzrLsJDMjZ\">1. \u5275\u5efa\u8868\u6642\u8a2d\u7f6e\u5916\u9375<\/h3>\n<pre><code>CREATE TABLE customers (\n    customer_id INT AUTO_INCREMENT,\n    name VARCHAR(100),\n    PRIMARY KEY (customer_id)\n);\n\nCREATE TABLE orders (\n    order_id INT AUTO_INCREMENT,\n    order_date DATE,\n    customer_id INT,\n    PRIMARY KEY (order_id),\n    FOREIGN KEY (customer_id) REFERENCES customers(customer_id)\n);\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c<code>orders<\/code>\u8868\u4e2d\u7684<code>customer_id<\/code>\u5b57\u6bb5\u4f5c\u70ba\u5916\u9375\uff0c\u5f15\u7528\u4e86<code>customers<\/code>\u8868\u7684<code>customer_id<\/code>\u4e3b\u9375\u3002<\/p>\n<h3 id=\"2-%e5%9c%a8%e5%b7%b2%e5%ad%98%e5%9c%a8%e7%9a%84%e8%a1%a8%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%a4%96%e9%8d%b5-SzrLsJDMjZ\">2. \u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u6dfb\u52a0\u5916\u9375<\/h3>\n<p>\u5982\u679c\u8868\u5df2\u7d93\u5b58\u5728\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\u4f86\u6dfb\u52a0\u5916\u9375\uff1a<\/p>\n<pre><code>ALTER TABLE orders\nADD CONSTRAINT fk_customer\nFOREIGN KEY (customer_id) REFERENCES customers(customer_id);\n<\/code><\/pre>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e9%81%b8%e9%a0%85-SzrLsJDMjZ\">\u5916\u9375\u7684\u9078\u9805<\/h2>\n<p>\u5728\u8a2d\u7f6e\u5916\u9375\u6642\uff0c\u53ef\u4ee5\u6307\u5b9a\u4e00\u4e9b\u9078\u9805\u4f86\u63a7\u5236\u6578\u64da\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\u5916\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\u5916\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-SzrLsJDMjZ\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>CREATE TABLE orders (\n    order_id INT AUTO_INCREMENT,\n    order_date DATE,\n    customer_id INT,\n    PRIMARY KEY (order_id),\n    FOREIGN KEY (customer_id) REFERENCES customers(customer_id)\n    ON DELETE CASCADE\n    ON UPDATE CASCADE\n);\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-SzrLsJDMjZ\">\u7d50\u8ad6<\/h2>\n<p>\u5916\u9375\u5728MySQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u6b63\u78ba\u5730\u8a2d\u7f6e\u5916\u9375\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u4e26\u81ea\u52d5\u8655\u7406\u6578\u64da\u7684\u66f4\u65b0\u548c\u522a\u9664\u3002\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u6578\u64da\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\uff0c\u5916\u9375\u7684\u4f7f\u7528\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u78ba\u4fdd\u60a8\u7684\u6578\u64da\u5b89\u5168\u548c\u9ad8\u6548\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8a73\u7d30\u89e3\u8aacMySQL\u5916\u9375\u8a2d\u7f6e\u306e\u65b9\u6cd5\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3002\u30c7\u30fc\u30bf\u6574\u5408\u6027\u3092\u4fdd\u3064\u305f\u3081\u306e\u91cd\u8981\u306a\u624b\u6cd5\u3092\u5b66\u3073\u307e\u3057\u3087\u3046\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-191338","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191338","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=191338"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191338\/revisions"}],"predecessor-version":[{"id":191339,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191338\/revisions\/191339"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=191338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=191338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=191338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}