{"id":44251,"date":"2024-12-01T09:21:58","date_gmt":"2024-12-01T01:21:58","guid":{"rendered":"https:\/\/fwq.ai\/blog\/44251\/"},"modified":"2024-12-01T09:21:58","modified_gmt":"2024-12-01T01:21:58","slug":"mysql-%e5%a6%82%e4%bd%95%e5%ae%9a%e4%b9%89%e5%92%8c%e4%bd%bf%e7%94%a8%e5%a4%8d%e5%90%88%e4%b8%bb%e9%94%ae","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/44251\/","title":{"rendered":"MySQL \u5982\u4f55\u5b9a\u4e49\u548c\u4f7f\u7528\u590d\u5408\u4e3b\u952e"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>MySQL \u5982\u4f55\u5b9a\u4e49\u548c\u4f7f\u7528\u590d\u5408\u4e3b\u952e<\/h1>\n<p>\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n<p>MySQL \u4e2d\u7684\u590d\u5408\u4e3b\u952e\u662f\u6307\u8868\u4e2d\u7531\u591a\u4e2a\u5b57\u6bb5\u7ec4\u5408\u800c\u6210\u7684\u4e3b\u952e\uff0c\u7528\u6765\u552f\u4e00\u6807\u8bc6\u6bcf\u6761\u8bb0\u5f55\u3002\u4e0e\u5355\u4e00\u4e3b\u952e\u4e0d\u540c\u7684\u662f\uff0c\u590d\u5408\u4e3b\u952e\u7531\u591a\u4e2a\u5b57\u6bb5\u7684\u503c\u7ec4\u5408\u5728\u4e00\u8d77\u5f62\u6210\u3002\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u591a\u4e2a\u5b57\u6bb5\u4e3a\u4e3b\u952e\u6765\u5b9a\u4e49\u590d\u5408\u4e3b\u952e\u3002<\/p>\n<p>\u4e3a\u4e86\u6f14\u793a\u590d\u5408\u4e3b\u952e\u7684\u5b9a\u4e49\u4e0e\u4f5c\u7528\uff0c\u6211\u4eec\u5148\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a <code>users<\/code> \u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e86 <code>id<\/code>\u3001<code>username<\/code> \u548c <code>email<\/code> \u8fd9\u4e09\u4e2a\u5b57\u6bb5\uff0c\u5176\u4e2d <code>id<\/code> \u662f\u81ea\u589e\u4e3b\u952e\uff0c<code>username<\/code> \u662f\u7528\u6237\u540d\u79f0\uff0c<code>email<\/code> \u662f\u7528\u6237\u90ae\u7bb1\u3002\u6211\u4eec\u5c06\u901a\u8fc7 <code>username<\/code> \u548c <code>email<\/code> \u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7ec4\u5408\u5728\u4e00\u8d77\u4f5c\u4e3a\u590d\u5408\u4e3b\u952e\u3002<\/p>\n<pre>CREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(50) NOT NULL,\n    PRIMARY KEY(username, email)\n);<\/pre>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u901a\u8fc7\u5728 <code>CREATE TABLE<\/code> \u8bed\u53e5\u4e2d\u4f7f\u7528 <code>PRIMARY KEY(username, email)<\/code> \u6765\u5b9a\u4e49\u4e86\u590d\u5408\u4e3b\u952e\uff0c\u5c06 <code>username<\/code> \u548c <code>email<\/code> \u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7ec4\u5408\u5728\u4e00\u8d77\u4f5c\u4e3a\u552f\u4e00\u6807\u8bc6\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u5411\u8868\u4e2d\u63d2\u5165\u4e00\u4e9b\u6570\u636e\uff0c\u6ce8\u610f\u7531\u4e8e\u590d\u5408\u4e3b\u952e\u7684\u5b58\u5728\uff0c\u6bcf\u6761\u8bb0\u5f55\u7684 <code>username<\/code> \u548c <code>email<\/code> \u7ec4\u5408\u5fc5\u987b\u662f\u552f\u4e00\u7684\u3002<\/p>\n<pre>INSERT INTO users (username, email) VALUES ('alice', 'alice@example.com');\nINSERT INTO users (username, email) VALUES ('bob', 'bob@example.com');<\/pre>\n<p>\u5982\u679c\u6211\u4eec\u518d\u8bd5\u56fe\u63d2\u5165\u4e00\u6761 <code>username<\/code> \u548c <code>email<\/code> \u90fd\u4e0e\u4e4b\u524d\u8bb0\u5f55\u76f8\u540c\u7684\u6570\u636e\uff0c\u5c31\u4f1a\u89e6\u53d1\u552f\u4e00\u6027\u7ea6\u675f\u7684\u9519\u8bef\uff1a<\/p>\n<pre>INSERT INTO users (username, email) VALUES ('alice', 'alice@example.com');\n-- \u8f93\u51fa\u9519\u8bef\uff1aDuplicate entry 'alice@example.com' for key 'PRIMARY'<\/pre>\n<p>\u8fd9\u5c31\u662f\u590d\u5408\u4e3b\u952e\u7684\u4f5c\u7528\u4e4b\u4e00\uff0c\u786e\u4fdd\u8868\u4e2d\u6bcf\u6761\u8bb0\u5f55\u7684\u7ec4\u5408\u5b57\u6bb5\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u907f\u514d\u6570\u636e\u91cd\u590d\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u590d\u5408\u4e3b\u952e\u53ef\u4ee5\u5728\u6570\u636e\u8868\u8bbe\u8ba1\u4e2d\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002\u5f53\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\u9700\u8981\u901a\u8fc7\u591a\u4e2a\u5b57\u6bb5\u6765\u552f\u4e00\u6807\u8bc6\u65f6\uff0c\u590d\u5408\u4e3b\u952e\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6570\u636e\u5b8c\u6574\u6027\u4fdd\u969c\u3002\u540c\u65f6\uff0c\u5728\u4e00\u4e9b\u67e5\u8be2\u4ee5\u53ca\u8868\u5173\u8054\u64cd\u4f5c\u4e2d\uff0c\u590d\u5408\u4e3b\u952e\u4e5f\u6709\u5176\u7279\u6b8a\u7684\u7528\u9014\uff0c\u80fd\u591f\u5e2e\u52a9\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u548c\u51c6\u786e\u6027\u3002<\/p>\n<p>\u603b\u7ed3\u8d77\u6765\uff0cMySQL \u4e2d\u7684\u590d\u5408\u4e3b\u952e\u662f\u7531\u591a\u4e2a\u5b57\u6bb5\u7ec4\u5408\u800c\u6210\u7684\u4e3b\u952e\uff0c\u7528\u6765\u552f\u4e00\u6807\u8bc6\u6bcf\u6761\u8bb0\u5f55\u3002\u901a\u8fc7\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5b9a\u4e49\u590d\u5408\u4e3b\u952e\uff0c\u4ee5\u53ca\u5176\u5728\u6570\u636e\u5b8c\u6574\u6027\u548c\u67e5\u8be2\u6548\u7387\u65b9\u9762\u7684\u4f5c\u7528\uff0c\u5e0c\u671b\u80fd\u5bf9\u7406\u89e3\u590d\u5408\u4e3b\u952e\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aMySQL \u5982\u4f55\u5b9a\u4e49\u548c\u4f7f\u7528\u590d\u5408\u4e3b\u952e\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u5427\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>MySQL \u5982\u4f55\u5b9a\u4e49\u548c\u4f7f\u7528\u590d\u5408\u4e3b\u952e \u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01 MySQL \u4e2d\u7684\u590d\u5408\u4e3b\u952e\u662f\u6307\u8868\u4e2d\u7531\u591a\u4e2a\u5b57\u6bb5\u7ec4\u5408\u800c\u6210\u7684\u4e3b\u952e\uff0c\u7528\u6765\u552f\u4e00\u6807\u8bc6\u6bcf\u6761\u8bb0\u5f55\u3002\u4e0e\u5355\u4e00\u4e3b\u952e\u4e0d\u540c\u7684\u662f\uff0c\u590d\u5408\u4e3b\u952e\u7531\u591a\u4e2a\u5b57\u6bb5\u7684\u503c\u7ec4\u5408\u5728\u4e00\u8d77\u5f62\u6210\u3002\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u591a\u4e2a\u5b57\u6bb5\u4e3a\u4e3b\u952e\u6765\u5b9a\u4e49\u590d\u5408\u4e3b\u952e\u3002 \u4e3a\u4e86\u6f14\u793a\u590d\u5408\u4e3b\u952e\u7684\u5b9a\u4e49\u4e0e\u4f5c\u7528\uff0c\u6211\u4eec\u5148\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a users \u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e86 id\u3001username \u548c email \u8fd9\u4e09\u4e2a\u5b57\u6bb5\uff0c\u5176\u4e2d id \u662f\u81ea\u589e\u4e3b\u952e\uff0cusername \u662f\u7528\u6237\u540d\u79f0\uff0cemail \u662f\u7528\u6237\u90ae\u7bb1\u3002\u6211\u4eec\u5c06\u901a\u8fc7 username \u548c email \u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7ec4\u5408\u5728\u4e00\u8d77\u4f5c\u4e3a\u590d\u5408\u4e3b\u952e\u3002 CREATE TABLE users ( id INT AUTO_INCREMENT PRIMARY KEY, username VARCHAR(50) NOT NULL, email VARCHAR(50) NOT NULL, PRIMARY KEY(username, email) ); \u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u901a\u8fc7\u5728 CREATE TABLE \u8bed\u53e5\u4e2d\u4f7f\u7528 PRIMARY KEY(username, email) \u6765\u5b9a\u4e49\u4e86\u590d\u5408\u4e3b\u952e\uff0c\u5c06 username \u548c email \u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7ec4\u5408\u5728\u4e00\u8d77\u4f5c\u4e3a\u552f\u4e00\u6807\u8bc6\u3002 \u63a5\u4e0b\u6765\u6211\u4eec\u5411\u8868\u4e2d\u63d2\u5165\u4e00\u4e9b\u6570\u636e\uff0c\u6ce8\u610f\u7531\u4e8e\u590d\u5408\u4e3b\u952e\u7684\u5b58\u5728\uff0c\u6bcf\u6761\u8bb0\u5f55\u7684 username [&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-44251","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/44251","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=44251"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/44251\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=44251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=44251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=44251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}