{"id":196804,"date":"2024-11-14T02:39:20","date_gmt":"2024-11-13T18:39:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/196804\/"},"modified":"2024-11-14T02:39:21","modified_gmt":"2024-11-13T18:39:21","slug":"%e9%87%8d%e8%a6%81%e6%80%a7%e5%92%8c%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%8d%e8%83%bd%e9%87%8d%e8%a4%87%e7%9a%84%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/196804\/","title":{"rendered":"\u91cd\u8981\u6027\u548c\u4f7f\u7528\u65b9\u6cd5 (\u6578\u64da\u5eab\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6)"},"content":{"rendered":"<h1 id=\"%e9%87%8d%e8%a6%81%e6%80%a7%e5%92%8c%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%8d%e8%83%bd%e9%87%8d%e8%a4%87%e7%9a%84%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6-KsQLMRrmcX\">\u91cd\u8981\u6027\u548c\u4f7f\u7528\u65b9\u6cd5 (\u6578\u64da\u5eab\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u7d04\u675f\u689d\u4ef6\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002\u5176\u4e2d\uff0c\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6\uff08Unique Constraint\uff09\u662f\u6700\u5e38\u7528\u7684\u7d04\u675f\u4e4b\u4e00\u3002\u9019\u7a2e\u7d04\u675f\u78ba\u4fdd\u4e86\u6578\u64da\u8868\u4e2d\u7684\u67d0\u4e00\u5217\u6216\u591a\u5217\u7684\u503c\u662f\u552f\u4e00\u7684\uff0c\u5f9e\u800c\u9632\u6b62\u4e86\u91cd\u8907\u6578\u64da\u7684\u51fa\u73fe\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6\u7684\u91cd\u8981\u6027\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%b8%8d%e8%83%bd%e9%87%8d%e8%a4%87%e7%9a%84%e7%b4%84%e6%9d%9f%e6%a2%9d%e4%bb%b6%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7-KsQLMRrmcX\">\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6\u7684\u91cd\u8981\u6027<\/h2>\n<p>\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6\u5728\u6578\u64da\u5eab\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u4e3b\u8981\u9ad4\u73fe\u5728\u4ee5\u4e0b\u5e7e\u500b\u65b9\u9762\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u901a\u904e\u78ba\u4fdd\u67d0\u4e9b\u5b57\u6bb5\u7684\u552f\u4e00\u6027\uff0c\u9019\u7a2e\u7d04\u675f\u53ef\u4ee5\u9632\u6b62\u91cd\u8907\u6578\u64da\u7684\u63d2\u5165\uff0c\u5f9e\u800c\u4fdd\u6301\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u5728\u7528\u6236\u4fe1\u606f\u8868\u4e2d\uff0c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u901a\u5e38\u9700\u8981\u662f\u552f\u4e00\u7684\uff0c\u4ee5\u907f\u514d\u591a\u500b\u7528\u6236\u4f7f\u7528\u76f8\u540c\u7684\u96fb\u5b50\u90f5\u4ef6\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u7576\u6578\u64da\u8868\u4e2d\u7684\u67d0\u4e9b\u5b57\u6bb5\u5fc5\u9808\u4fdd\u6301\u552f\u4e00\u6642\uff0c\u9019\u6709\u52a9\u65bc\u7dad\u8b77\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u9019\u5c0d\u65bc\u9700\u8981\u9032\u884c\u67e5\u8a62\u548c\u5831\u544a\u7684\u61c9\u7528\u7a0b\u5e8f\u5c24\u70ba\u91cd\u8981\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff1a<\/strong>\u552f\u4e00\u7d04\u675f\u53ef\u4ee5\u5e6b\u52a9\u6578\u64da\u5eab\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002\u7576\u6578\u64da\u5eab\u77e5\u9053\u67d0\u4e00\u5217\u7684\u503c\u662f\u552f\u4e00\u7684\u6642\uff0c\u67e5\u8a62\u6642\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95-KsQLMRrmcX\">\u4f7f\u7528\u65b9\u6cd5<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u8a2d\u7f6e\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6\u76f8\u5c0d\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4e3b\u8981\u4ee5 SQL \u8a9e\u53e5\u70ba\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e8%a1%a8%e6%99%82%e8%a8%ad%e7%bd%ae%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-KsQLMRrmcX\">1. \u5275\u5efa\u8868\u6642\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f<\/h3>\n<pre><code>\nCREATE TABLE Users (\n    UserID INT PRIMARY KEY,\n    Email VARCHAR(255) UNIQUE,\n    Username VARCHAR(50) UNIQUE\n);\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0c<code>Email<\/code> \u548c <code>Username<\/code> \u5b57\u6bb5\u90fd\u88ab\u8a2d\u7f6e\u70ba\u552f\u4e00\uff0c\u9019\u610f\u5473\u8457\u5728 <code>Users<\/code> \u8868\u4e2d\uff0c\u9019\u5169\u500b\u5b57\u6bb5\u7684\u503c\u4e0d\u80fd\u91cd\u8907\u3002<\/p>\n<h3 id=\"2-%e5%9c%a8%e5%b7%b2%e5%ad%98%e5%9c%a8%e7%9a%84%e8%a1%a8%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-KsQLMRrmcX\">2. \u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u6dfb\u52a0\u552f\u4e00\u7d04\u675f<\/h3>\n<pre><code>\nALTER TABLE Users\nADD CONSTRAINT UC_Email UNIQUE (Email);\n<\/code><\/pre>\n<p>\u5982\u679c\u5728\u5275\u5efa\u8868\u6642\u672a\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u6dfb\u52a0\u7d04\u675f\u3002\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u70ba <code>Email<\/code> \u5b57\u6bb5\u6dfb\u52a0\u4e86\u552f\u4e00\u7d04\u675f\u3002<\/p>\n<h3 id=\"3-%e8%99%95%e7%90%86%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e9%81%95%e8%a6%8f-KsQLMRrmcX\">3. \u8655\u7406\u552f\u4e00\u7d04\u675f\u9055\u898f<\/h3>\n<p>\u7576\u5617\u8a66\u63d2\u5165\u91cd\u8907\u7684\u6578\u64da\u6642\uff0c\u6578\u64da\u5eab\u6703\u8fd4\u56de\u932f\u8aa4\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nINSERT INTO Users (UserID, Email, Username) VALUES (1, 'test@example.com', 'testuser');\nINSERT INTO Users (UserID, Email, Username) VALUES (2, 'test@example.com', 'anotheruser'); -- \u9019\u5c07\u5c0e\u81f4\u932f\u8aa4\n<\/code><\/pre>\n<p>\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u7b2c\u4e8c\u689d\u63d2\u5165\u8a9e\u53e5\u5c07\u56e0\u70ba <code>Email<\/code> \u5b57\u6bb5\u7684\u552f\u4e00\u7d04\u675f\u800c\u5931\u6557\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-KsQLMRrmcX\">\u7d50\u8ad6<\/h2>\n<p>\u4e0d\u80fd\u91cd\u8907\u7684\u7d04\u675f\u689d\u4ef6\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\uff0c\u5b83\u4e0d\u50c5\u80fd\u5920\u4fdd\u8b49\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u901a\u904e\u6b63\u78ba\u5730\u4f7f\u7528\u9019\u4e9b\u7d04\u675f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\uff0c\u907f\u514d\u91cd\u8907\u6578\u64da\u7684\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\uff0c\u7406\u89e3\u548c\u61c9\u7528\u9019\u4e9b\u7d04\u675f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u5176\u4ed6\u6280\u8853\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u6211\u5011\u63d0\u4f9b\u5404\u7a2e <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u548c\u61c9\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u6578\u64da\u5eab\u4e2d\u4e0d\u91cd\u8907\u7d04\u675f\u689d\u4ef6\u7684\u91cd\u8981\u6027\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\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-196804","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196804","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=196804"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196804\/revisions"}],"predecessor-version":[{"id":196805,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196804\/revisions\/196805"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=196804"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=196804"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=196804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}