{"id":5515,"date":"2024-11-14T13:33:39","date_gmt":"2024-11-14T05:33:39","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5515\/"},"modified":"2024-11-14T13:33:39","modified_gmt":"2024-11-14T05:33:39","slug":"mysql%e7%ba%a6%e6%9d%9f%e6%80%8e%e4%b9%88%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5515\/","title":{"rendered":"mysql\u7ea6\u675f\u600e\u4e48\u4f7f\u7528"},"content":{"rendered":"

\n mysql \u7ea6\u675f\u662f\u5f3a\u5236\u6267\u884c\u6570\u636e\u5e93\u8868\u4e2d\u6570\u636e\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u89c4\u5219\u3002\u5b83\u4eec\u5305\u62ec\uff1a\u975e\u7a7a\u7ea6\u675f\uff1a\u786e\u4fdd\u5217\u4e0d\u4e3a\u7a7a\u3002\u552f\u4e00\u7ea6\u675f\uff1a\u786e\u4fdd\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002\u4e3b\u952e\u7ea6\u675f\uff1a\u6807\u8bc6\u8868\u7684\u552f\u4e00\u884c\uff0c\u901a\u5e38\u4e0e\u975e\u7a7a\u548c\u552f\u4e00\u7ea6\u675f\u7ed3\u5408\u4f7f\u7528\u3002\u5916\u952e\u7ea6\u675f\uff1a\u5c06\u8868\u4e2d\u7684\u5217\u4e0e\u53e6\u4e00\u8868\u4e2d\u7684\u4e3b\u952e\u94fe\u63a5\u8d77\u6765\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u3002\u7ea6\u675f\u63d0\u4f9b\u6570\u636e\u5b8c\u6574\u6027\u3001\u4e00\u81f4\u6027\u548c\u6027\u80fd\u4f18\u5316\u7684\u597d\u5904\u3002\u4e0d\u8fc7\uff0c\u5728\u4f7f\u7528\u65f6\u5e94\u8003\u8651\u7ea6\u675f\u5bf9\u6570\u636e\u64cd\u4f5c\u7684\u9650\u5236\uff0c\u5e76\u4ed4\u7ec6\u6743\u8861\u7ea6\u675f\u7684\u7c7b\u578b\u548c\u8303\u56f4\u3002\n<\/p><\/blockquote>\n

\"mysql\u7ea6\u675f\u600e\u4e48\u4f7f\u7528\u63d2\u56fe\"<\/p>\n

MySQL \u7ea6\u675f\u4f7f\u7528\u6307\u5357<\/strong><\/p>\n

\u4ec0\u4e48\u662f\u7ea6\u675f<\/strong><\/p>\n

\u7ea6\u675f\u662f\u5728 MySQL \u6570\u636e\u5e93\u8868\u4e2d\u5f3a\u5236\u6267\u884c\u6570\u636e\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u89c4\u5219\u3002<\/p>\n

\u7c7b\u578b<\/strong><\/p>\n

MySQL \u4e2d\u6709\u4e0d\u540c\u7c7b\u578b\u7684\u7ea6\u675f\uff0c\u5305\u62ec\uff1a<\/p>\n

\u975e\u7a7a\u7ea6\u675f\uff08NOT NULL\uff09<\/strong>\uff1a\u786e\u4fdd\u5217\u4e0d\u5305\u542b\u7a7a\u503c\u3002
\u552f\u4e00\u7ea6\u675f\uff08UNIQUE\uff09<\/strong>\uff1a\u786e\u4fdd\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002
\u4e3b\u952e\u7ea6\u675f\uff08PRIMARY KEY\uff09<\/strong>\uff1a\u6807\u8bc6\u8868\u7684\u552f\u4e00\u884c\uff0c\u901a\u5e38\u4e0e\u975e\u7a7a\u7ea6\u675f\u548c\u552f\u4e00\u7ea6\u675f\u7ed3\u5408\u4f7f\u7528\u3002
\u5916\u952e\u7ea6\u675f\uff08FOREIGN KEY\uff09<\/strong>\uff1a\u5c06\u8868\u4e2d\u7684\u5217\u4e0e\u53e6\u4e00\u8868\u4e2d\u7684\u4e3b\u952e\u94fe\u63a5\u8d77\u6765\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u3002<\/p>\n

\u5982\u4f55\u4f7f\u7528<\/strong><\/p>\n

\u5728 MySQL \u4e2d\u521b\u5efa\u7ea6\u675f\uff1a<\/p>\n

ALTER TABLE table_name ADD CONSTRAINT constraint_name TYPE constraint_type (column_name);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f8b\u5982\uff0c\u4e3a users \u8868\u7684 email \u5217\u6dfb\u52a0\u975e\u7a7a\u7ea6\u675f\uff1a<\/p>\n
ALTER TABLE users ADD CONSTRAINT email_not_null NOT NULL (email);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u597d\u5904<\/strong><\/p>\n
\u4f7f\u7528\u7ea6\u675f\u53ef\u4ee5\u5e26\u6765\u4ee5\u4e0b\u597d\u5904\uff1a<\/p>\n
    \n
  •  \u6570\u636e\u5b8c\u6574\u6027\uff1a<\/strong>\u786e\u4fdd\u6570\u636e\u7b26\u5408\u9884\u671f\u7684\u89c4\u5219\u548c\u89c4\u8303\u3002<\/li>\n
  •  \u6570\u636e\u4e00\u81f4\u6027\uff1a<\/strong>\u9632\u6b62\u7531\u4e8e\u591a\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u800c\u51fa\u73b0\u4e0d\u4e00\u81f4\u7684\u6570\u636e\u3002<\/li>\n
  •  \u6027\u80fd\u4f18\u5316\uff1a<\/strong>\u53ef\u4ee5\u901a\u8fc7\u5728\u7d22\u5f15\u4e2d\u4f7f\u7528\u7ea6\u675f\u6765\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n<\/ul>\n
    \u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n
    \u5728\u4f7f\u7528\u7ea6\u675f\u65f6\u5e94\u6ce8\u610f\u4ee5\u4e0b\u4e8b\u9879\uff1a<\/p>\n
      \n
    • \u7ea6\u675f\u53ef\u80fd\u9650\u5236\u6570\u636e\u63d2\u5165\u548c\u4fee\u6539\u7684\u80fd\u529b\u3002<\/li>\n
    • \u4ed4\u7ec6\u8003\u8651\u7ea6\u675f\u7684\u7c7b\u578b\u548c\u8303\u56f4\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9650\u5236\u3002<\/li>\n
    • \u5728\u5220\u9664\u7ea6\u675f\u4e4b\u524d\uff0c\u8bf7\u786e\u4fdd\u4e0d\u4f1a\u7834\u574f\u6570\u636e\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n
      \u4ee5\u4e0a\u5c31\u662f\u7ea6\u675f\u600e\u4e48\u4f7f\u7528\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":"
      mysql \u7ea6\u675f\u662f\u5f3a\u5236\u6267\u884c\u6570\u636e\u5e93\u8868\u4e2d\u6570\u636e\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u89c4\u5219\u3002\u5b83\u4eec\u5305\u62ec\uff1a\u975e\u7a7a\u7ea6\u675f\uff1a\u786e\u4fdd\u5217\u4e0d\u4e3a\u7a7a\u3002\u552f\u4e00\u7ea6\u675f\uff1a\u786e\u4fdd\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002\u4e3b\u952e\u7ea6\u675f\uff1a\u6807\u8bc6\u8868\u7684\u552f\u4e00\u884c\uff0c\u901a\u5e38\u4e0e\u975e\u7a7a\u548c\u552f\u4e00\u7ea6\u675f\u7ed3\u5408\u4f7f\u7528\u3002\u5916\u952e\u7ea6\u675f\uff1a\u5c06\u8868\u4e2d\u7684\u5217\u4e0e\u53e6\u4e00\u8868\u4e2d\u7684\u4e3b\u952e\u94fe\u63a5\u8d77\u6765\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u3002\u7ea6\u675f\u63d0\u4f9b\u6570\u636e\u5b8c\u6574\u6027\u3001\u4e00\u81f4\u6027\u548c\u6027\u80fd\u4f18\u5316\u7684\u597d\u5904\u3002\u4e0d\u8fc7\uff0c\u5728\u4f7f\u7528\u65f6\u5e94\u8003\u8651\u7ea6\u675f\u5bf9\u6570\u636e\u64cd\u4f5c\u7684\u9650\u5236\uff0c\u5e76\u4ed4\u7ec6\u6743\u8861\u7ea6\u675f\u7684\u7c7b\u578b\u548c\u8303\u56f4\u3002 MySQL \u7ea6\u675f\u4f7f\u7528\u6307\u5357 \u4ec0\u4e48\u662f\u7ea6\u675f \u7ea6\u675f\u662f\u5728 MySQL \u6570\u636e\u5e93\u8868\u4e2d\u5f3a\u5236\u6267\u884c\u6570\u636e\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u89c4\u5219\u3002 \u7c7b\u578b MySQL \u4e2d\u6709\u4e0d\u540c\u7c7b\u578b\u7684\u7ea6\u675f\uff0c\u5305\u62ec\uff1a \u975e\u7a7a\u7ea6\u675f\uff08NOT NULL\uff09\uff1a\u786e\u4fdd\u5217\u4e0d\u5305\u542b\u7a7a\u503c\u3002\u552f\u4e00\u7ea6\u675f\uff08UNIQUE\uff09\uff1a\u786e\u4fdd\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002\u4e3b\u952e\u7ea6\u675f\uff08PRIMARY KEY\uff09\uff1a\u6807\u8bc6\u8868\u7684\u552f\u4e00\u884c\uff0c\u901a\u5e38\u4e0e\u975e\u7a7a\u7ea6\u675f\u548c\u552f\u4e00\u7ea6\u675f\u7ed3\u5408\u4f7f\u7528\u3002\u5916\u952e\u7ea6\u675f\uff08FOREIGN KEY\uff09\uff1a\u5c06\u8868\u4e2d\u7684\u5217\u4e0e\u53e6\u4e00\u8868\u4e2d\u7684\u4e3b\u952e\u94fe\u63a5\u8d77\u6765\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u3002 \u5982\u4f55\u4f7f\u7528 \u5728 MySQL \u4e2d\u521b\u5efa\u7ea6\u675f\uff1a ALTER TABLE table_name ADD CONSTRAINT constraint_name TYPE constraint_type (column_name); \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff0c\u4e3a users \u8868\u7684 email \u5217\u6dfb\u52a0\u975e\u7a7a\u7ea6\u675f\uff1a ALTER TABLE users ADD CONSTRAINT email_not_null NOT NULL (email); \u767b\u5f55\u540e\u590d\u5236 \u597d\u5904 \u4f7f\u7528\u7ea6\u675f\u53ef\u4ee5\u5e26\u6765\u4ee5\u4e0b\u597d\u5904\uff1a \u6570\u636e\u5b8c\u6574\u6027\uff1a\u786e\u4fdd\u6570\u636e\u7b26\u5408\u9884\u671f\u7684\u89c4\u5219\u548c\u89c4\u8303\u3002 \u6570\u636e\u4e00\u81f4\u6027\uff1a\u9632\u6b62\u7531\u4e8e\u591a\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u800c\u51fa\u73b0\u4e0d\u4e00\u81f4\u7684\u6570\u636e\u3002 \u6027\u80fd\u4f18\u5316\uff1a\u53ef\u4ee5\u901a\u8fc7\u5728\u7d22\u5f15\u4e2d\u4f7f\u7528\u7ea6\u675f\u6765\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002 \u6ce8\u610f\u4e8b\u9879 \u5728\u4f7f\u7528\u7ea6\u675f\u65f6\u5e94\u6ce8\u610f\u4ee5\u4e0b\u4e8b\u9879\uff1a \u7ea6\u675f\u53ef\u80fd\u9650\u5236\u6570\u636e\u63d2\u5165\u548c\u4fee\u6539\u7684\u80fd\u529b\u3002 \u4ed4\u7ec6\u8003\u8651\u7ea6\u675f\u7684\u7c7b\u578b\u548c\u8303\u56f4\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9650\u5236\u3002 \u5728\u5220\u9664\u7ea6\u675f\u4e4b\u524d\uff0c\u8bf7\u786e\u4fdd\u4e0d\u4f1a\u7834\u574f\u6570\u636e\u5b8c\u6574\u6027\u3002 \u4ee5\u4e0a\u5c31\u662f\u7ea6\u675f\u600e\u4e48\u4f7f\u7528\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5515","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5515","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=5515"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5515\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5515"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}