{"id":200039,"date":"2025-05-06T09:38:26","date_gmt":"2025-05-06T01:38:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200039\/"},"modified":"2025-05-06T09:38:26","modified_gmt":"2025-05-06T01:38:26","slug":"%e5%ae%9a%e4%b9%89%e5%92%8c%e7%ba%a6%e6%9d%9f%e5%a4%96%e9%94%ae%e5%9c%a8mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200039\/","title":{"rendered":"\u5b9a\u4e49\u548c\u7ea6\u675f\u5916\u952e\u5728MySQL\u6570\u636e\u5e93\u4e2d"},"content":{"rendered":"

<\/b> <\/p>\n

\u5b9a\u4e49\u548c\u7ea6\u675f\u5916\u952e\u5728MySQL\u6570\u636e\u5e93\u4e2d<\/h1>\n

\u76ee\u524d\u4e3b\u673a\u5b9d\u8d1d\u4e0a\u5df2\u7ecf\u6709\u5f88\u591a\u5173\u4e8e\u7684\u6587\u7ae0\u4e86\uff0c\u81ea\u5df1\u5728\u521d\u6b21\u9605\u8bfb\u8fd9\u4e9b\u6587\u7ae0\u4e2d\uff0c\u4e5f\u89c1\u8bc6\u5230\u4e86\u5f88\u591a\u5b66\u4e60\u601d\u8def\uff1b\u90a3\u4e48\u672c\u6587\uff0c\u4e5f\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff0c\u5982\u679c\u9605\u8bfb\u5b8c\u540e\u771f\u7684\u5bf9\u4f60\u5b66\u4e60\u6709\u5e2e\u52a9\uff0c\u6b22\u8fce\u52a8\u52a8\u624b\u6307\uff0c\u8bc4\u8bba\u7559\u8a00\u5e76\u5206\u4eab~<\/p>\n

\u6807\u9898\uff1aMySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u5b9a\u4e49\u548c\u9650\u5236<\/p>\n

\u5728MySQL\u6570\u636e\u5e93\u4e2d\uff0c\u5916\u952e\u662f\u4e00\u79cd\u7528\u4e8e\u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u5173\u7cfb\u7684\u7ea6\u675f\u3002\u5916\u952e\u53ef\u4ee5\u786e\u4fdd\u5728\u4e00\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u4e0e\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u5177\u6709\u4e00\u5b9a\u7684\u5173\u8054\u6027\u3002\u901a\u8fc7\u5b9a\u4e49\u5916\u952e\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u6570\u636e\u4e4b\u95f4\u7684\u53c2\u7167\u5b8c\u6574\u6027\uff0c\u4ece\u800c\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n

1. \u5916\u952e\u7684\u5b9a\u4e49<\/strong><\/p>\n

\u5728MySQL\u4e2d\uff0c\u5916\u952e\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u6cd5\u6765\u5b9a\u4e49\uff1a<\/p>\n

CREATE TABLE \u8868\u540d (\n    \u5217\u540d \u6570\u636e\u7c7b\u578b,\n    \u5916\u952e\u5217\u540d \u6570\u636e\u7c7b\u578b,\n    FOREIGN KEY (\u5916\u952e\u5217\u540d) REFERENCES \u5173\u8054\u8868\u540d(\u5173\u8054\u5217\u540d)\n);<\/pre>\n
\u5176\u4e2d\uff0c\u5916\u952e\u5217\u540d<\/code> \u662f\u5f53\u524d\u8868\u4e2d\u9700\u8981\u5173\u8054\u7684\u5217\u540d\uff0c\u5173\u8054\u8868\u540d<\/code> \u662f\u9700\u8981\u5173\u8054\u7684\u8868\u7684\u8868\u540d\uff0c\u5173\u8054\u5217\u540d<\/code> \u662f\u5173\u8054\u8868\u4e2d\u9700\u8981\u5173\u8054\u7684\u5217\u540d\u3002\u901a\u8fc7\u8fd9\u79cd\u5b9a\u4e49\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8868\u4e4b\u95f4\u5efa\u7acb\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\u3002<\/p>\n
2. \u5916\u952e\u7684\u9650\u5236<\/strong><\/p>\n
\u5728\u5b9a\u4e49\u5916\u952e\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e9b\u9650\u5236\u6761\u4ef6\u6765\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u5916\u952e\u9650\u5236\u6761\u4ef6\uff1a<\/p>\n
    \n
  • ON DELETE CASCADE\uff1a\u5f53\u4e3b\u8868\u4e2d\u7684\u8bb0\u5f55\u88ab\u5220\u9664\u65f6\uff0c\u4ece\u8868\u4e2d\u7684\u76f8\u5173\u8bb0\u5f55\u4e5f\u4f1a\u88ab\u5220\u9664\u3002<\/li>\n
  • ON DELETE SET NULL\uff1a\u5f53\u4e3b\u8868\u4e2d\u7684\u8bb0\u5f55\u88ab\u5220\u9664\u65f6\uff0c\u4ece\u8868\u4e2d\u7684\u76f8\u5173\u8bb0\u5f55\u7684\u5916\u952e\u503c\u4f1a\u88ab\u8bbe\u7f6e\u4e3aNULL\u3002<\/li>\n
  • ON UPDATE CASCADE\uff1a\u5f53\u4e3b\u8868\u4e2d\u7684\u8bb0\u5f55\u4e3b\u952e\u503c\u88ab\u66f4\u65b0\u65f6\uff0c\u4ece\u8868\u4e2d\u7684\u76f8\u5173\u8bb0\u5f55\u7684\u5916\u952e\u503c\u4e5f\u4f1a\u88ab\u66f4\u65b0\u3002<\/li>\n
  • ON UPDATE SET NULL\uff1a\u5f53\u4e3b\u8868\u4e2d\u7684\u8bb0\u5f55\u4e3b\u952e\u503c\u88ab\u66f4\u65b0\u65f6\uff0c\u4ece\u8868\u4e2d\u7684\u76f8\u5173\u8bb0\u5f55\u7684\u5916\u952e\u503c\u4f1a\u88ab\u8bbe\u7f6e\u4e3aNULL\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u5916\u952e\u5b9a\u4e49\u548c\u9650\u5236\u7684\u793a\u4f8b\uff1a<\/p>\n
    CREATE TABLE \u7236\u8868 (\n    id INT PRIMARY KEY,\n    name VARCHAR(50)\n);\n\nCREATE TABLE \u5b50\u8868 (\n    id INT PRIMARY KEY,\n    parent_id INT,\n    FOREIGN KEY (parent_id) REFERENCES \u7236\u8868(id) ON DELETE CASCADE\n);<\/pre>\n
    \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u7236\u8868\u548c\u5b50\u8868\u4e4b\u95f4\u5efa\u7acb\u4e86\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u5f53\u7236\u8868\u4e2d\u7684\u8bb0\u5f55\u88ab\u5220\u9664\u65f6\uff0c\u5b50\u8868\u4e2d\u4e0e\u4e4b\u76f8\u5173\u7684\u8bb0\u5f55\u4e5f\u4f1a\u88ab\u5220\u9664\uff0c\u4ece\u800c\u4fdd\u8bc1\u4e86\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n
    \u901a\u8fc7\u4ee5\u4e0a\u7684\u4ecb\u7ecd\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5728MySQL\u6570\u636e\u5e93\u4e2d\uff0c\u5916\u952e\u7684\u5b9a\u4e49\u548c\u9650\u5236\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u4ece\u800c\u6709\u6548\u5730\u7ba1\u7406\u548c\u7ef4\u62a4\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n
    \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u5b9a\u4e49\u548c\u7ea6\u675f\u5916\u952e\u5728MySQL\u6570\u636e\u5e93\u4e2d\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6570\u636e\u5e93\u77e5\u8bc6\uff01<\/p>\n
    \n
    \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    \u5b9a\u4e49\u548c\u7ea6\u675f\u5916\u952e\u5728MySQL\u6570\u636e\u5e93...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200039","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200039","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200039"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200039\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200039"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200039"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200039"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}