{"id":5168,"date":"2024-11-14T12:11:15","date_gmt":"2024-11-14T04:11:15","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5168\/"},"modified":"2024-11-14T12:11:15","modified_gmt":"2024-11-14T04:11:15","slug":"mysql%e8%a1%a8%e7%bb%93%e6%9e%84%e6%80%8e%e4%b9%88%e4%bf%ae%e6%94%b9","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5168\/","title":{"rendered":"mysql\u8868\u7ed3\u6784\u600e\u4e48\u4fee\u6539"},"content":{"rendered":"

\n \u4fee\u6539 mysql \u8868\u7ed3\u6784\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 alter table \u547d\u4ee4\uff0c\u53ef\u7528\u4e8e\u6dfb\u52a0\u3001\u5220\u9664\u6216\u4fee\u6539\u5217\u3001\u7ea6\u675f\u548c\u5176\u4ed6\u5c5e\u6027\u3002\u8be6\u7ec6\u6b65\u9aa4\u5305\u62ec\uff1a\u8fde\u63a5\u5230\u6570\u636e\u5e93\u3002\u6307\u5b9a\u8868\u540d\u3002\u6267\u884c\u4fee\u6539\u64cd\u4f5c\uff08add\u3001drop\u3001modify\u3001change\u3001rename\uff09\u3002\u6307\u5b9a\u5217\u5c5e\u6027\uff08\u5bf9\u4e8e\u6dfb\u52a0\u6216\u4fee\u6539\u5217\uff09\u3002\u6dfb\u52a0\u7ea6\u675f\uff08\u53ef\u9009\uff09\u3002\u6267\u884c\u67e5\u8be2\u3002\n<\/p><\/blockquote>\n

\"mysql\u8868\u7ed3\u6784\u600e\u4e48\u4fee\u6539\u63d2\u56fe\"<\/p>\n

MySQL \u8868\u7ed3\u6784\u4fee\u6539\u6307\u5357<\/strong><\/p>\n

\u5982\u4f55\u4fee\u6539 MySQL \u8868\u7ed3\u6784\uff1f<\/strong><\/p>\n

\u4fee\u6539 MySQL \u8868\u7ed3\u6784\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u4f7f\u7528 ALTER TABLE \u547d\u4ee4\u3002\u8be5\u547d\u4ee4\u5141\u8bb8\u60a8\u6dfb\u52a0\u3001\u5220\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\u3001\u7ea6\u675f\u548c\u5176\u4ed6\u5c5e\u6027\u3002<\/p>\n

\u8be6\u7ec6\u6b65\u9aa4\uff1a<\/strong><\/p>\n

    \n
  1. \u8fde\u63a5\u5230\u6570\u636e\u5e93\uff1a<\/strong>\u4f7f\u7528 SQL \u5ba2\u6237\u7aef\u6216\u547d\u4ee4\u884c\u8fde\u63a5\u5230\u5305\u542b\u8981\u4fee\u6539\u8868\u7684\u6570\u636e\u5e93\u3002<\/li>\n
  2. \u6307\u5b9a\u8868\u540d\uff1a<\/strong>\u5728 ALTER TABLE \u8bed\u53e5\u540e\u6307\u5b9a\u8981\u4fee\u6539\u7684\u8868\u540d\u3002<\/li>\n
  3. \n

    \u6267\u884c\u4fee\u6539\u64cd\u4f5c\uff1a<\/strong>\u4f7f\u7528\u4ee5\u4e0b\u5b50\u53e5\u4e4b\u4e00\u8fdb\u884c\u6240\u9700\u7684\u4fee\u6539\uff1a<\/p>\n

      \n
    • ADD\uff1a\u6dfb\u52a0\u65b0\u5217\u3002<\/li>\n
    • DROP\uff1a\u5220\u9664\u73b0\u6709\u5217\u3002<\/li>\n
    • MODIFY\uff1a\u4fee\u6539\u73b0\u6709\u5217\u7684\u6570\u636e\u7c7b\u578b\u3001\u957f\u5ea6\u6216\u5176\u4ed6\u5c5e\u6027\u3002<\/li>\n
    • CHANGE\uff1a\u5c06\u73b0\u6709\u5217\u91cd\u547d\u540d\u6216\u4fee\u6539\u5176\u5b9a\u4e49\u3002<\/li>\n
    • RENAME\uff1a\u5c06\u8868\u91cd\u547d\u540d\u4e3a\u65b0\u540d\u79f0\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \u6307\u5b9a\u5217\u5c5e\u6027\uff1a<\/strong>\u5bf9\u4e8e\u6dfb\u52a0\u6216\u4fee\u6539\u5217\u7684\u64cd\u4f5c\uff0c\u60a8\u9700\u8981\u6307\u5b9a\u5217\u7684\u540d\u79f0\u3001\u6570\u636e\u7c7b\u578b\u3001\u957f\u5ea6\u548c\u5176\u4ed6\u5c5e\u6027\u3002<\/li>\n
    • \u6dfb\u52a0\u7ea6\u675f\uff1a<\/strong>\u60a8\u53ef\u4ee5\u4f7f\u7528 CONSTRAINT \u5b50\u53e5\u6dfb\u52a0\u8868\u7ea6\u675f\uff0c\u4f8b\u5982\u4e3b\u952e\u3001\u5916\u952e\u6216\u552f\u4e00\u7d22\u5f15\u3002<\/li>\n
    • \u6267\u884c\u67e5\u8be2\uff1a<\/strong>\u8fd0\u884c ALTER TABLE \u67e5\u8be2\u4ee5\u5e94\u7528\u4fee\u6539\u3002<\/li>\n<\/ol>\n

      \u793a\u4f8b\uff1a<\/strong><\/p>\n

      \u4ee5\u4e0b\u793a\u4f8b\u8bf4\u660e\u5982\u4f55\u5411\u540d\u4e3a users \u7684\u8868\u4e2d\u6dfb\u52a0\u540d\u4e3a age \u7684\u65b0\u5217\uff1a<\/p>\n

      ALTER TABLE users ADD age INT NOT NULL;<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n
        \n
      • \u4fee\u6539\u8868\u7ed3\u6784\u53ef\u80fd\u4f1a\u5f71\u54cd\u73b0\u6709\u6570\u636e\u3002<\/li>\n
      • \u5728\u6267\u884c\u4fee\u6539\u4e4b\u524d\uff0c\u5f3a\u70c8\u5efa\u8bae\u5907\u4efd\u8868\u3002<\/li>\n
      • \u60a8\u53ea\u80fd\u4fee\u6539\u5df2\u5b58\u5728\u4e8e\u8868\u4e2d\u7684\u5217\uff0c\u800c\u4e0d\u80fd\u6dfb\u52a0\u4e0d\u5b58\u5728\u7684\u5217\u3002<\/li>\n
      • \u4fee\u6539\u8868\u7ed3\u6784\u53ef\u80fd\u4f1a\u5bf9\u8868\u4e0a\u7684\u7d22\u5f15\u548c\u7ea6\u675f\u4ea7\u751f\u5f71\u54cd\u3002<\/li>\n<\/ul>\n
        \u4ee5\u4e0a\u5c31\u662f\u8868\u7ed3\u6784\u600e\u4e48\u4fee\u6539\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":"
        \u4fee\u6539 mysql \u8868\u7ed3\u6784\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 alter table \u547d\u4ee4\uff0c\u53ef\u7528\u4e8e\u6dfb\u52a0\u3001\u5220\u9664\u6216\u4fee\u6539\u5217\u3001\u7ea6\u675f\u548c\u5176\u4ed6\u5c5e\u6027\u3002\u8be6\u7ec6\u6b65\u9aa4\u5305\u62ec\uff1a\u8fde\u63a5\u5230\u6570\u636e\u5e93\u3002\u6307\u5b9a\u8868\u540d\u3002\u6267\u884c\u4fee\u6539\u64cd\u4f5c\uff08add\u3001drop\u3001modify\u3001change\u3001rename\uff09\u3002\u6307\u5b9a\u5217\u5c5e\u6027\uff08\u5bf9\u4e8e\u6dfb\u52a0\u6216\u4fee\u6539\u5217\uff09\u3002\u6dfb\u52a0\u7ea6\u675f\uff08\u53ef\u9009\uff09\u3002\u6267\u884c\u67e5\u8be2\u3002 MySQL \u8868\u7ed3\u6784\u4fee\u6539\u6307\u5357 \u5982\u4f55\u4fee\u6539 MySQL \u8868\u7ed3\u6784\uff1f \u4fee\u6539 MySQL \u8868\u7ed3\u6784\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u4f7f\u7528 ALTER TABLE \u547d\u4ee4\u3002\u8be5\u547d\u4ee4\u5141\u8bb8\u60a8\u6dfb\u52a0\u3001\u5220\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\u3001\u7ea6\u675f\u548c\u5176\u4ed6\u5c5e\u6027\u3002 \u8be6\u7ec6\u6b65\u9aa4\uff1a \u8fde\u63a5\u5230\u6570\u636e\u5e93\uff1a\u4f7f\u7528 SQL \u5ba2\u6237\u7aef\u6216\u547d\u4ee4\u884c\u8fde\u63a5\u5230\u5305\u542b\u8981\u4fee\u6539\u8868\u7684\u6570\u636e\u5e93\u3002 \u6307\u5b9a\u8868\u540d\uff1a\u5728 ALTER TABLE \u8bed\u53e5\u540e\u6307\u5b9a\u8981\u4fee\u6539\u7684\u8868\u540d\u3002 \u6267\u884c\u4fee\u6539\u64cd\u4f5c\uff1a\u4f7f\u7528\u4ee5\u4e0b\u5b50\u53e5\u4e4b\u4e00\u8fdb\u884c\u6240\u9700\u7684\u4fee\u6539\uff1a ADD\uff1a\u6dfb\u52a0\u65b0\u5217\u3002 DROP\uff1a\u5220\u9664\u73b0\u6709\u5217\u3002 MODIFY\uff1a\u4fee\u6539\u73b0\u6709\u5217\u7684\u6570\u636e\u7c7b\u578b\u3001\u957f\u5ea6\u6216\u5176\u4ed6\u5c5e\u6027\u3002 CHANGE\uff1a\u5c06\u73b0\u6709\u5217\u91cd\u547d\u540d\u6216\u4fee\u6539\u5176\u5b9a\u4e49\u3002 RENAME\uff1a\u5c06\u8868\u91cd\u547d\u540d\u4e3a\u65b0\u540d\u79f0\u3002 \u6307\u5b9a\u5217\u5c5e\u6027\uff1a\u5bf9\u4e8e\u6dfb\u52a0\u6216\u4fee\u6539\u5217\u7684\u64cd\u4f5c\uff0c\u60a8\u9700\u8981\u6307\u5b9a\u5217\u7684\u540d\u79f0\u3001\u6570\u636e\u7c7b\u578b\u3001\u957f\u5ea6\u548c\u5176\u4ed6\u5c5e\u6027\u3002 \u6dfb\u52a0\u7ea6\u675f\uff1a\u60a8\u53ef\u4ee5\u4f7f\u7528 CONSTRAINT \u5b50\u53e5\u6dfb\u52a0\u8868\u7ea6\u675f\uff0c\u4f8b\u5982\u4e3b\u952e\u3001\u5916\u952e\u6216\u552f\u4e00\u7d22\u5f15\u3002 \u6267\u884c\u67e5\u8be2\uff1a\u8fd0\u884c ALTER TABLE \u67e5\u8be2\u4ee5\u5e94\u7528\u4fee\u6539\u3002 \u793a\u4f8b\uff1a \u4ee5\u4e0b\u793a\u4f8b\u8bf4\u660e\u5982\u4f55\u5411\u540d\u4e3a users \u7684\u8868\u4e2d\u6dfb\u52a0\u540d\u4e3a age \u7684\u65b0\u5217\uff1a ALTER TABLE users ADD age INT NOT NULL; \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\u4e8b\u9879\uff1a […]<\/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-5168","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5168","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=5168"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5168\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5168"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5168"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}