{"id":200064,"date":"2025-05-06T11:22:13","date_gmt":"2025-05-06T03:22:13","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200064\/"},"modified":"2025-05-06T11:22:13","modified_gmt":"2025-05-06T03:22:13","slug":"%e8%af%a6%e7%bb%86%e4%bb%8b%e7%bb%8dmysql%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ad%e5%a4%96%e9%94%ae%e7%9a%84%e4%bd%9c%e7%94%a8%e5%92%8c%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200064\/","title":{"rendered":"\u8be6\u7ec6\u4ecb\u7ecdMySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u4f5c\u7528\u548c\u7528\u6cd5"},"content":{"rendered":"

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

\u8be6\u7ec6\u4ecb\u7ecdMySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u4f5c\u7528\u548c\u7528\u6cd5<\/h1>\n

MySQL\u6570\u636e\u5e93\u4e2d\uff0c\u5916\u952e\u662f\u7528\u6765\u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u5173\u8054\u7684\u91cd\u8981\u5de5\u5177\uff0c\u80fd\u591f\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\uff0c\u7ef4\u62a4\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u5916\u952e\u901a\u8fc7\u5b9a\u4e49\u8868\u4e2d\u7684\u5217\u4e0e\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u5217\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u6765\u786e\u4fdd\u5b50\u8868\u4e2d\u7684\u6570\u636e\u5728\u7236\u8868\u4e2d\u5b58\u5728\uff0c\u9632\u6b62\u56e0\u6570\u636e\u4e0d\u4e00\u81f4\u5bfc\u81f4\u7684\u9519\u8bef\u3002<\/p>\n

MySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u4f5c\u7528\u53ca\u7528\u6cd5\u8be6\u89e3<\/p>\n

\u5728MySQL\u6570\u636e\u5e93\u4e2d\uff0c\u5916\u952e\u662f\u7528\u6765\u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u5173\u8054\u7684\u91cd\u8981\u5de5\u5177\uff0c\u5b83\u80fd\u591f\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\uff0c\u5e76\u4e14\u63d0\u4f9b\u4e86\u4e00\u79cd\u65b9\u5f0f\u6765\u7ef4\u62a4\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecdMySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u4f5c\u7528\u548c\u7528\u6cd5\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

\u4e00\u3001\u5916\u952e\u7684\u4f5c\u7528<\/p>\n

    \n
  1. \u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\uff1a\u5916\u952e\u53ef\u4ee5\u786e\u4fdd\u5728\u5b50\u8868\u4e2d\u7684\u6570\u636e\u5fc5\u987b\u5728\u7236\u8868\u4e2d\u5b58\u5728\uff0c\u907f\u514d\u4e86\u56e0\u6570\u636e\u4e0d\u4e00\u81f4\u5bfc\u81f4\u7684\u9519\u8bef\u3002<\/li>\n
  2. \u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a\u5916\u952e\u53ef\u4ee5\u5b9a\u4e49\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u4f7f\u67e5\u8be2\u548c\u64cd\u4f5c\u6570\u636e\u53d8\u5f97\u66f4\u52a0\u65b9\u4fbf\u548c\u9ad8\u6548\u3002<\/li>\n
  3. \u7ea6\u675f\u6570\u636e\u64cd\u4f5c\uff1a\u5916\u952e\u53ef\u4ee5\u9650\u5236\u5bf9\u8868\u6570\u636e\u7684\u64cd\u4f5c\uff0c\u786e\u4fdd\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u6b63\u786e\u6027\u3002<\/li>\n<\/ol>\n

    \u4e8c\u3001\u5916\u952e\u7684\u7528\u6cd5<\/p>\n

      \n
    1. \u521b\u5efa\u8868\u65f6\u5b9a\u4e49\u5916\u952e\uff1a\u5728\u521b\u5efa\u8868\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u5916\u952e\u6765\u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u8054\u5173\u7cfb\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/li>\n<\/ol>\n
      CREATE TABLE \u8868\u540d (\n    \u5217\u540d \u6570\u636e\u7c7b\u578b,\n    ...\n    FOREIGN KEY (\u5916\u952e\u5217\u540d) REFERENCES \u7236\u8868\u540d(\u7236\u8868\u5217\u540d)\n    [ON DELETE CASCADE\/SET NULL\/RESTRICT\/NO ACTION]\n    [ON UPDATE CASCADE\/SET NULL\/RESTRICT\/NO ACTION]\n);<\/pre>\n
      \u5176\u4e2d\uff0cFOREIGN KEY<\/code>\u7528\u6765\u5b9a\u4e49\u5916\u952e\uff0cREFERENCES<\/code>\u6307\u5b9a\u7236\u8868\u548c\u7236\u8868\u5217\uff0cON DELETE<\/code>\u548cON UPDATE<\/code>\u7528\u6765\u6307\u5b9a\u5220\u9664\u548c\u66f4\u65b0\u65f6\u7684\u64cd\u4f5c\u7b56\u7565\u3002<\/p>\n
        \n
      1. \u4fee\u6539\u8868\u7ed3\u6784\u6dfb\u52a0\u5916\u952e\uff1a\u5982\u679c\u5df2\u7ecf\u5b58\u5728\u7684\u8868\u9700\u8981\u6dfb\u52a0\u5916\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE<\/code>\u8bed\u53e5\u6765\u4fee\u6539\u8868\u7ed3\u6784\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/li>\n<\/ol>\n
        ALTER TABLE \u5b50\u8868\u540d\nADD CONSTRAINT \u5916\u952e\u540d\u79f0\nFOREIGN KEY (\u5916\u952e\u5217\u540d) REFERENCES \u7236\u8868\u540d(\u7236\u8868\u5217\u540d);<\/pre>\n
          \n
        1. \u5220\u9664\u5916\u952e\uff1a\u5982\u679c\u9700\u8981\u5220\u9664\u8868\u7684\u5916\u952e\u7ea6\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE<\/code>\u8bed\u53e5\u6765\u5220\u9664\u5916\u952e\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/li>\n<\/ol>\n
          ALTER TABLE \u5b50\u8868\u540d\nDROP FOREIGN KEY \u5916\u952e\u540d\u79f0;<\/pre>\n
            \n
          1. \u4f7f\u7528\u5916\u952e\u7ea6\u675f\uff1a\u5728\u6570\u636e\u64cd\u4f5c\u65f6\uff0cMySQL\u4f1a\u6839\u636e\u5916\u952e\u7684\u5b9a\u4e49\u6765\u68c0\u67e5\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u63d2\u5165\u5b50\u8868\u6570\u636e\u65f6\uff0c\u5982\u679c\u63d2\u5165\u7684\u5916\u952e\u503c\u5728\u7236\u8868\u4e2d\u4e0d\u5b58\u5728\uff0c\u5c06\u4f1a\u5bfc\u81f4\u63d2\u5165\u5931\u8d25\u3002<\/li>\n<\/ol>\n
            \u4e09\u3001\u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/p>\n
            \u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u5177\u4f53\u7684\u793a\u4f8b\u6765\u6f14\u793aMySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u4f7f\u7528\uff1a<\/p>\n
            \u5047\u8bbe\u6211\u4eec\u6709\u4e24\u4e2a\u8868\uff0c\u4e00\u4e2a\u662f\u5b66\u751f\u8868(students<\/code>)\uff0c\u53e6\u4e00\u4e2a\u662f\u6210\u7ee9\u8868(scores<\/code>)\uff0c\u5b83\u4eec\u4e4b\u95f4\u5b58\u5728\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\u3002\u6211\u4eec\u8981\u6c42\u5b66\u751f\u6210\u7ee9\u8868\u4e2d\u7684\u5b66\u751fID\u5fc5\u987b\u5728\u5b66\u751f\u8868\u4e2d\u5b58\u5728\u3002<\/p>\n
              \n
            1. \u521b\u5efa\u5b66\u751f\u8868\uff1a<\/li>\n<\/ol>\n
              CREATE TABLE students (\n    student_id INT PRIMARY KEY,\n    student_name VARCHAR(50)\n);<\/pre>\n
                \n
              1. \u521b\u5efa\u6210\u7ee9\u8868\uff0c\u5e76\u5b9a\u4e49\u5916\u952e\uff1a<\/li>\n<\/ol>\n
                CREATE TABLE scores (\n    score_id INT PRIMARY KEY,\n    student_id INT,\n    score INT,\n    FOREIGN KEY (student_id) REFERENCES students(student_id)\n);<\/pre>\n
                \u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u6210\u7ee9\u8868\u4e2d\u7684student_id<\/code>\u5217\u4f5c\u4e3a\u5916\u952e\uff0c\u5173\u8054\u5230\u5b66\u751f\u8868\u4e2d\u7684student_id<\/code>\u5217\u3002\u8fd9\u6837\uff0c\u63d2\u5165\u6210\u7ee9\u6570\u636e\u65f6\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u68c0\u67e5\u5b66\u751fID\u7684\u6709\u6548\u6027\u3002<\/p>\n
                \u603b\u7ed3\uff1a<\/p>\n
                MySQL\u6570\u636e\u5e93\u4e2d\u7684\u5916\u952e\u662f\u4e00\u79cd\u975e\u5e38\u91cd\u8981\u7684\u6570\u636e\u5173\u7cfb\u5de5\u5177\uff0c\u5b83\u80fd\u591f\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\uff0c\u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u8054\u5173\u7cfb\uff0c\u5e76\u7ea6\u675f\u6570\u636e\u64cd\u4f5c\u3002\u901a\u8fc7\u5408\u7406\u4f7f\u7528\u5916\u952e\uff0c\u80fd\u591f\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u64cd\u4f5c\u6548\u7387\u548c\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u662f\u6570\u636e\u5e93\u8bbe\u8ba1\u4e2d\u5fc5\u4e0d\u53ef\u5c11\u7684\u4e00\u90e8\u5206\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u60a8\u7406\u89e3MySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u4f5c\u7528\u548c\u7528\u6cd5\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
                \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u8be6\u7ec6\u4ecb\u7ecdMySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684\u4f5c\u7528\u548c\u7528\u6cd5\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":"
                \u8be6\u7ec6\u4ecb\u7ecdMySQL\u6570\u636e\u5e93\u4e2d\u5916\u952e\u7684...<\/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-200064","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200064","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=200064"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200064\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200064"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200064"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200064"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}