{"id":4059,"date":"2025-05-29T11:04:34","date_gmt":"2025-06-05T04:04:34","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4059"},"modified":"2025-06-05T11:04:34","modified_gmt":"2025-06-05T04:04:34","slug":"%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8swift%e4%b8%ad%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8swift%e4%b8%ad%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88\/","title":{"rendered":"\u5168\u9762\u638c\u63e1 Swift \u4e2d\u7684\u6578\u64da\u5eab\u8a2d\u8a08\uff1a2025 \u6700\u65b0\u6559\u5b78\u8207\u5be6\u4f5c\u7bc4\u4f8b"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Swift, \u6570\u636e\u5e93\u8bbe\u8ba1, \u6570\u636e\u5e93\u8303\u5f0f, \u6570\u636e\u5e93\u7ea6\u675f, \u6570\u636e\u5e93\u7d22\u5f15, \u6570\u636e\u5e93\u89c6\u56fe, Swift \u6570\u636e\u5e93\u6559\u7a0b, Swift 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UNIQUE\n);\n<\/pre>\n<p>\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86 <code>id<\/code> \u5b57\u6bb5\u4f5c\u70ba\u4e3b\u9375\uff0c\u4e26\u78ba\u4fdd <code>name<\/code> \u548c <code>email<\/code> \u5b57\u6bb5\u4e0d\u70ba\u7a7a\uff0c<code>email<\/code> \u5b57\u6bb5\u540c\u6642\u8a2d\u7f6e\u70ba\u552f\u4e00\u503c\u3002<\/p>\n<h2>\u4f7f\u7528\u6578\u64da\u5eab\u7d04\u675f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027<\/h2>\n<p>\u6578\u64da\u5eab\u7d04\u675f\u662f\u4e00\u7a2e\u6a5f\u5236\uff0c\u7528\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u4f8b\u5982\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u70ba <code>users<\/code> \u8868\u6dfb\u52a0\u7d04\u675f\uff0c\u4fdd\u8b49 <code>email<\/code> \u6b04\u4f4d\u7684\u552f\u4e00\u6027\uff1a<\/p>\n<pre class=\"brush: swift\">\nALTER TABLE users\nADD CONSTRAINT unique_email UNIQUE (email);\n<\/pre>\n<p>\u901a\u904e\u6b64\u7d04\u675f\uff0c\u6211\u5011\u53ef\u4ee5\u9632\u6b62\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u3002<\/p>\n<h2>\u5229\u7528\u6578\u64da\u5eab\u7d22\u5f15\u63d0\u5347\u67e5\u8a62\u6548\u7387<\/h2>\n<p>\u6578\u64da\u5eab\u7d22\u5f15\u662f\u4e00\u7a2e\u63d0\u5347\u67e5\u8a62\u6548\u7387\u7684\u6a5f\u5236\u3002\u4f7f\u7528 Swift \u6642\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>CREATE INDEX<\/code> \u8a9e\u53e5\u4f86\u5275\u5efa\u7d22\u5f15\uff0c\u4ee5\u4e0b\u662f\u5275\u5efa\u4e00\u500b\u540d\u70ba <code>email_index<\/code> \u7684\u7d22\u5f15\u7684\u793a\u4f8b\uff1a<\/p>\n<pre class=\"brush: swift\">\nCREATE INDEX email_index ON users (email);\n<\/pre>\n<p>\u9019\u6a23\u4e00\u4f86\uff0c\u67e5\u8a62 <code>email<\/code> 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month');\n<\/pre>\n<p>\u6b64\u67e5\u8a62\u5c07\u8fd4\u56de\u5728\u6700\u8fd1\u4e00\u500b\u6708\u5167\u6709\u904e\u767b\u9304\u7684\u6240\u6709\u7528\u6236\uff0c\u5c0d\u65bc\u5206\u6790\u6d3b\u8e8d\u7528\u6236\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u672c\u6587\u4ecb\u7d39\u4e86\u5728 Swift \u4e2d\u5982\u4f55\u9032\u884c\u6578\u64da\u5eab\u8a2d\u8a08\uff0c\u6db5\u84cb\u4e86\u6578\u64da\u5eab\u8303\u5f0f\u3001\u7d04\u675f\u3001\u7d22\u5f15\u548c\u8996\u5716\u7684\u4f7f\u7528\u3002\u901a\u904e\u9019\u4e9b\u6280\u8853\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\uff0c\u63d0\u5347\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002<\/p>\n<h2>Q&#038;A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n<h3>Q1: Swift \u4e2d\u5982\u4f55\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\uff1f<\/h3>\n<p>A1: \u6839\u64da\u61c9\u7528\u9700\u6c42\u9078\u64c7\u6578\u64da\u5eab\uff0c\u4f8b\u5982\u4f7f\u7528 SQLite 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