{"id":186268,"date":"2024-11-11T04:30:19","date_gmt":"2024-11-10T20:30:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186268\/"},"modified":"2024-11-11T04:30:20","modified_gmt":"2024-11-10T20:30:20","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e4%b8%ad%e7%9a%84%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6-%e6%95%b8%e6%93%9a%e5%ba%ab-%e6%9f%a5%e8%a9%a2-%e5%94%af%e4%b8%80%e7%b4%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186268\/","title":{"rendered":"\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u7684\u552f\u4e00\u7d04\u675f\u689d\u4ef6 (\u6578\u64da\u5eab \u67e5\u8a62 \u552f\u4e00\u7d04\u675f\u689d\u4ef6)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e4%b8%ad%e7%9a%84%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6-sqdlZirrlR\">\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u7684\u552f\u4e00\u7d04\u675f\u689d\u4ef6<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u552f\u4e00\u7d04\u675f\u689d\u4ef6\uff08Unique Constraint\uff09\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u7d04\u675f\uff0c\u7528\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u662f\u9632\u6b62\u5728\u6578\u64da\u8868\u4e2d\u63d2\u5165\u91cd\u8907\u7684\u6578\u64da\u884c\uff0c\u7279\u5225\u662f\u5728\u67d0\u4e9b\u7279\u5b9a\u7684\u5217\u4e0a\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u7684\u6982\u5ff5\u3001\u7528\u9014\u3001\u5be6\u73fe\u65b9\u5f0f\u4ee5\u53ca\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6%ef%bc%9f-sqdlZirrlR\">\u4ec0\u9ebc\u662f\u552f\u4e00\u7d04\u675f\u689d\u4ef6\uff1f<\/h2>\n<p>\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u662f\u4e00\u7a2e\u6578\u64da\u5eab\u7d04\u675f\uff0c\u7528\u65bc\u78ba\u4fdd\u67d0\u4e00\u5217\u6216\u591a\u5217\u7684\u6578\u64da\u5728\u6574\u500b\u8868\u4e2d\u662f\u552f\u4e00\u7684\u3002\u9019\u610f\u5473\u8457\u5728\u9019\u4e9b\u5217\u4e2d\uff0c\u4e0d\u80fd\u6709\u5169\u884c\u64c1\u6709\u76f8\u540c\u7684\u503c\u3002\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u901a\u5e38\u7528\u65bc\u4e3b\u9375\uff08Primary Key\uff09\u4ee5\u5916\u7684\u5217\uff0c\u9019\u4e9b\u5217\u4e5f\u9700\u8981\u4fdd\u6301\u552f\u4e00\u6027\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u7528\u6236\u8cc7\u6599\u8868\u4e2d\uff0c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u901a\u5e38\u6703\u8a2d\u7f6e\u70ba\u552f\u4e00\u7d04\u675f\uff0c\u4ee5\u9632\u6b62\u591a\u500b\u7528\u6236\u4f7f\u7528\u76f8\u540c\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u8a3b\u518a\u3002<\/p>\n<h2 id=\"%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6%e7%9a%84%e7%94%a8%e9%80%94-sqdlZirrlR\">\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u7684\u7528\u9014<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u5e6b\u52a9\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9632\u6b62\u91cd\u8907\u6578\u64da\u7684\u51fa\u73fe\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff1a<\/strong>\u7531\u65bc\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\u904e\u7a0b\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u7279\u5b9a\u7684\u6578\u64da\u884c\u3002<\/li>\n<li><strong>\u696d\u52d9\u908f\u8f2f\u7684\u5be6\u73fe\uff1a<\/strong>\u5728\u8a31\u591a\u696d\u52d9\u5834\u666f\u4e2d\uff0c\u67d0\u4e9b\u6578\u64da\u5fc5\u9808\u4fdd\u6301\u552f\u4e00\u6027\uff0c\u4f8b\u5982\u7528\u6236\u540d\u3001\u7522\u54c1\u7de8\u865f\u7b49\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%be%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6-sqdlZirrlR\">\u5982\u4f55\u5be6\u73fe\u552f\u4e00\u7d04\u675f\u689d\u4ef6<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\u4f86\u5275\u5efa\u552f\u4e00\u7d04\u675f\u689d\u4ef6\uff1a<\/p>\n<pre><code>CREATE TABLE Users (\n    UserID INT PRIMARY KEY,\n    Email VARCHAR(255) UNIQUE,\n    Username VARCHAR(50) UNIQUE\n);<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c<code>Email<\/code> \u548c <code>Username<\/code> \u5217\u90fd\u8a2d\u7f6e\u4e86\u552f\u4e00\u7d04\u675f\uff0c\u9019\u610f\u5473\u8457\u5728 <code>Users<\/code> \u8868\u4e2d\uff0c\u9019\u5169\u5217\u7684\u503c\u5fc5\u9808\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h2 id=\"%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e4%b8%ad%e7%9a%84%e6%87%89%e7%94%a8-sqdlZirrlR\">\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u7684\u61c9\u7528<\/h2>\n<p>\u7576\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u53ef\u4ee5\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u5feb\u901f\u5b9a\u4f4d\u6578\u64da\u3002\u4f8b\u5982\uff0c\u7576\u67e5\u8a62\u67d0\u500b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u6642\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u5229\u7528\u552f\u4e00\u7d04\u675f\u4f86\u76f4\u63a5\u627e\u5230\u8a72\u7528\u6236\uff0c\u800c\u4e0d\u9700\u8981\u904d\u6b77\u6574\u500b\u8868\u3002<\/p>\n<pre><code>SELECT * FROM Users WHERE Email = 'example@example.com';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u7531\u65bc <code>Email<\/code> \u5217\u8a2d\u7f6e\u4e86\u552f\u4e00\u7d04\u675f\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u8fc5\u901f\u8fd4\u56de\u5c0d\u61c9\u7684\u7528\u6236\u8cc7\u6599\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-sqdlZirrlR\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u5be6\u65bd\u6642\u4e5f\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u5728\u8a2d\u8a08\u6578\u64da\u8868\u6642\uff0c\u61c9\u4ed4\u7d30\u8003\u616e\u54ea\u4e9b\u5217\u9700\u8981\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u958b\u92b7\u3002<\/li>\n<li>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u5fc5\u9808\u78ba\u4fdd\u4e0d\u6703\u9055\u53cd\u552f\u4e00\u7d04\u675f\uff0c\u5426\u5247\u5c07\u6703\u5f15\u767c\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u8907\u5408\u552f\u4e00\u7d04\u675f\uff0c\u5373\u5728\u591a\u500b\u5217\u4e0a\u8a2d\u7f6e\u552f\u4e00\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-sqdlZirrlR\">\u7e3d\u7d50<\/h2>\n<p>\u552f\u4e00\u7d04\u675f\u689d\u4ef6\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u80fd\u5920\u6709\u6548\u5730\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u5408\u7406\u5730\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u4e26\u78ba\u4fdd\u696d\u52d9\u908f\u8f2f\u7684\u6b63\u78ba\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u6216\u5176\u4ed6\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u7684\u552f\u4e00\u7d04\u675f\u689d\u4ef6\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u8207\u5b8c\u6574\u6027\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6578\u64da\u7ba1\u7406\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-186268","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186268","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=186268"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186268\/revisions"}],"predecessor-version":[{"id":186269,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186268\/revisions\/186269"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186268"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186268"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186268"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}