{"id":5777,"date":"2024-11-14T09:32:47","date_gmt":"2024-11-14T01:32:47","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5777\/"},"modified":"2024-11-14T09:32:47","modified_gmt":"2024-11-14T01:32:47","slug":"mysql%e5%a4%96%e9%94%ae%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5777\/","title":{"rendered":"mysql\u5916\u952e\u662f\u4ec0\u4e48\u610f\u601d"},"content":{"rendered":"<blockquote><p>\n  mysql\u5916\u952e\u7528\u4e8e\u8fde\u63a5\u4e24\u4e2a\u8868\uff0c\u786e\u4fdd\u5b50\u8868\u4e2d\u7684\u503c\u5728\u7236\u8868\u4e2d\u5b58\u5728\u3002\u521b\u5efa\u5916\u952e\u9700\u8981\u4f7f\u7528alter table\u8bed\u53e5\uff0c\u6307\u5b9a\u5916\u952e\u5217\u548c\u7236\u8868\u7684\u4e3b\u952e\u5217\u3002\u5916\u952e\u7684\u4f5c\u7528\u5305\u62ec\u7ef4\u62a4\u6570\u636e\u5b8c\u6574\u6027\u3001\u7ea7\u8054\u66f4\u65b0\u548c\u5220\u9664\u3001\u89c4\u8303\u5316\u6570\u636e\u3002\u5916\u952e\u7ea6\u675f\u5305\u62ec\u53c2\u7167\u5b8c\u6574\u6027\u3001\u7ea7\u8054\u66f4\u65b0\u548c\u7ea7\u8054\u5220\u9664\u3002\u5916\u952e\u5173\u7cfb\u53ef\u4ee5\u662f\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u6216\u591a\u5bf9\u591a\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202406\/02\/2024060201130933584.jpg\" class=\"aligncenter\" title=\"mysql\u5916\u952e\u662f\u4ec0\u4e48\u610f\u601d\u63d2\u56fe\" alt=\"mysql\u5916\u952e\u662f\u4ec0\u4e48\u610f\u601d\u63d2\u56fe\" \/><\/p>\n<p><strong>\u4ec0\u4e48\u662f MySQL \u5916\u952e\uff1f<\/strong><\/p>\n<p>MySQL \u5916\u952e\u662f\u4e00\u79cd\u6570\u636e\u5e93\u5173\u7cfb\uff0c\u5b83\u5728\u4e24\u4e2a\u8868\u4e4b\u95f4\u521b\u5efa\u4e86\u903b\u8f91\u8fde\u63a5\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002\u5b83\u6307\u5b9a\u4e00\u4e2a\u8868\u4e2d\u7684\u5217\u4e0e\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e3b\u952e\u5217\u76f8\u5bf9\u5e94\u3002<\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528\u5916\u952e\uff1f<\/strong><\/p>\n<p>\u8981\u521b\u5efa\u5916\u952e\uff0c\u8bf7\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n<pre>ALTER TABLE child_table ADD FOREIGN KEY (foreign_key_column) REFERENCES parent_table (primary_key_column);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li>child_table \u662f\u5305\u542b\u5916\u952e\u7684\u8868\u3002<\/li>\n<li>foreign_key_column \u662f child_table \u4e2d\u7684\u5916\u952e\u5217\u3002<\/li>\n<li>parent_table \u662f\u5916\u952e\u6240\u5f15\u7528\u7684\u8868\u3002<\/li>\n<li>primary_key_column \u662f parent_table \u4e2d\u7684\u4e3b\u952e\u5217\u3002<\/li>\n<\/ul>\n<p><strong>\u5916\u952e\u7684\u4f5c\u7528<\/strong><\/p>\n<p>\u5916\u952e\u7684\u4e3b\u8981\u4f5c\u7528\u662f\uff1a<\/p>\n<ul>\n<li> <strong>\u7ef4\u62a4\u6570\u636e\u5b8c\u6574\u6027\uff1a<\/strong>\u5b83\u9632\u6b62\u5411 child_table \u4e2d\u63d2\u5165\u6216\u66f4\u65b0\u4e0d\u5c5e\u4e8e parent_table \u4e2d\u4efb\u4f55\u884c\u7684\u503c\u3002<\/li>\n<li> <strong>\u7ea7\u8054\u66f4\u65b0\u548c\u5220\u9664\uff1a<\/strong>\u5f53\u5bf9 parent_table \u4e2d\u7684\u4e3b\u952e\u5217\u8fdb\u884c\u66f4\u65b0\u6216\u5220\u9664\u64cd\u4f5c\u65f6\uff0c\u5916\u952e\u53ef\u4ee5\u81ea\u52a8\u66f4\u65b0\u6216\u5220\u9664 child_table \u4e2d\u76f8\u5e94\u7684\u5916\u952e\u503c\u3002<\/li>\n<li> <strong>\u6570\u636e\u89c4\u8303\u5316\uff1a<\/strong>\u5916\u952e\u6709\u52a9\u4e8e\u5c06\u6570\u636e\u5206\u89e3\u6210\u66f4\u5c0f\u7684\u3001\u66f4\u5bb9\u6613\u7ba1\u7406\u7684\u8868\uff0c\u540c\u65f6\u4fdd\u6301\u6570\u636e\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<p><strong>\u5916\u952e\u7ea6\u675f<\/strong><\/p>\n<p>\u5916\u952e\u521b\u5efa\u540e\uff0c\u5b83\u4f1a\u81ea\u52a8\u5b9e\u65bd\u4ee5\u4e0b\u7ea6\u675f\uff1a<\/p>\n<ul>\n<li> <strong>\u53c2\u7167\u5b8c\u6574\u6027\uff1a<\/strong>child_table \u4e2d\u7684\u5916\u952e\u503c\u5fc5\u987b\u5728 parent_table \u4e2d\u7684\u4e3b\u952e\u503c\u5217\u8868\u4e2d\u3002<\/li>\n<li> <strong>\u7ea7\u8054\u66f4\u65b0\uff1a<\/strong>\u5982\u679c parent_table \u4e2d\u7684\u4e3b\u952e\u503c\u88ab\u66f4\u65b0\uff0cchild_table \u4e2d\u76f8\u5e94\u7684\u5916\u952e\u503c\u4e5f\u4f1a\u88ab\u66f4\u65b0\u3002<\/li>\n<li> <strong>\u7ea7\u8054\u5220\u9664\uff1a<\/strong>\u5982\u679c parent_table \u4e2d\u7684\u4e3b\u952e\u503c\u88ab\u5220\u9664\uff0cchild_table \u4e2d\u76f8\u5e94\u7684\u5916\u952e\u503c\u4e5f\u4f1a\u88ab\u5220\u9664\u3002<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>\u5916\u952e\u53ea\u80fd\u5f15\u7528\u4e3b\u952e\u6216\u552f\u4e00\u7d22\u5f15\u5217\u3002<\/li>\n<li>\u5916\u952e\u53ef\u4ee5\u4e3a NULL\uff0c\u4ee5\u5141\u8bb8 child_table \u4e2d\u5b58\u5728\u4e0d\u5c5e\u4e8e\u4efb\u4f55 parent_table \u884c\u7684\u503c\u3002<\/li>\n<li>\u5916\u952e\u5173\u7cfb\u53ef\u4ee5\u662f\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u6216\u591a\u5bf9\u591a\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5916\u952e\u662f\u4ec0\u4e48\u610f\u601d\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>mysql\u5916\u952e\u7528\u4e8e\u8fde\u63a5\u4e24\u4e2a\u8868\uff0c\u786e\u4fdd\u5b50\u8868\u4e2d\u7684\u503c\u5728\u7236\u8868\u4e2d\u5b58\u5728\u3002\u521b\u5efa\u5916\u952e\u9700\u8981\u4f7f\u7528alter table\u8bed\u53e5\uff0c\u6307\u5b9a\u5916\u952e\u5217\u548c\u7236\u8868\u7684\u4e3b\u952e\u5217\u3002\u5916\u952e\u7684\u4f5c\u7528\u5305\u62ec\u7ef4\u62a4\u6570\u636e\u5b8c\u6574\u6027\u3001\u7ea7\u8054\u66f4\u65b0\u548c\u5220\u9664\u3001\u89c4\u8303\u5316\u6570\u636e\u3002\u5916\u952e\u7ea6\u675f\u5305\u62ec\u53c2\u7167\u5b8c\u6574\u6027\u3001\u7ea7\u8054\u66f4\u65b0\u548c\u7ea7\u8054\u5220\u9664\u3002\u5916\u952e\u5173\u7cfb\u53ef\u4ee5\u662f\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u6216\u591a\u5bf9\u591a\u3002 \u4ec0\u4e48\u662f MySQL \u5916\u952e\uff1f MySQL \u5916\u952e\u662f\u4e00\u79cd\u6570\u636e\u5e93\u5173\u7cfb\uff0c\u5b83\u5728\u4e24\u4e2a\u8868\u4e4b\u95f4\u521b\u5efa\u4e86\u903b\u8f91\u8fde\u63a5\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002\u5b83\u6307\u5b9a\u4e00\u4e2a\u8868\u4e2d\u7684\u5217\u4e0e\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e3b\u952e\u5217\u76f8\u5bf9\u5e94\u3002 \u5982\u4f55\u4f7f\u7528\u5916\u952e\uff1f \u8981\u521b\u5efa\u5916\u952e\uff0c\u8bf7\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a ALTER TABLE child_table ADD FOREIGN KEY (foreign_key_column) REFERENCES parent_table (primary_key_column); \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a child_table \u662f\u5305\u542b\u5916\u952e\u7684\u8868\u3002 foreign_key_column \u662f child_table \u4e2d\u7684\u5916\u952e\u5217\u3002 parent_table \u662f\u5916\u952e\u6240\u5f15\u7528\u7684\u8868\u3002 primary_key_column \u662f parent_table \u4e2d\u7684\u4e3b\u952e\u5217\u3002 \u5916\u952e\u7684\u4f5c\u7528 \u5916\u952e\u7684\u4e3b\u8981\u4f5c\u7528\u662f\uff1a \u7ef4\u62a4\u6570\u636e\u5b8c\u6574\u6027\uff1a\u5b83\u9632\u6b62\u5411 child_table \u4e2d\u63d2\u5165\u6216\u66f4\u65b0\u4e0d\u5c5e\u4e8e parent_table \u4e2d\u4efb\u4f55\u884c\u7684\u503c\u3002 \u7ea7\u8054\u66f4\u65b0\u548c\u5220\u9664\uff1a\u5f53\u5bf9 parent_table \u4e2d\u7684\u4e3b\u952e\u5217\u8fdb\u884c\u66f4\u65b0\u6216\u5220\u9664\u64cd\u4f5c\u65f6\uff0c\u5916\u952e\u53ef\u4ee5\u81ea\u52a8\u66f4\u65b0\u6216\u5220\u9664 child_table \u4e2d\u76f8\u5e94\u7684\u5916\u952e\u503c\u3002 \u6570\u636e\u89c4\u8303\u5316\uff1a\u5916\u952e\u6709\u52a9\u4e8e\u5c06\u6570\u636e\u5206\u89e3\u6210\u66f4\u5c0f\u7684\u3001\u66f4\u5bb9\u6613\u7ba1\u7406\u7684\u8868\uff0c\u540c\u65f6\u4fdd\u6301\u6570\u636e\u4e00\u81f4\u6027\u3002 \u5916\u952e\u7ea6\u675f \u5916\u952e\u521b\u5efa\u540e\uff0c\u5b83\u4f1a\u81ea\u52a8\u5b9e\u65bd\u4ee5\u4e0b\u7ea6\u675f\uff1a \u53c2\u7167\u5b8c\u6574\u6027\uff1achild_table \u4e2d\u7684\u5916\u952e\u503c\u5fc5\u987b\u5728 parent_table \u4e2d\u7684\u4e3b\u952e\u503c\u5217\u8868\u4e2d\u3002 \u7ea7\u8054\u66f4\u65b0\uff1a\u5982\u679c parent_table \u4e2d\u7684\u4e3b\u952e\u503c\u88ab\u66f4\u65b0\uff0cchild_table [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5777","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5777"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5777\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}