{"id":187826,"date":"2024-11-11T17:30:20","date_gmt":"2024-11-11T09:30:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187826\/"},"modified":"2024-11-11T17:30:21","modified_gmt":"2024-11-11T09:30:21","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%96%ae%e4%bd%8d%e7%9a%84%e6%8a%80%e5%b7%a7-%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%b5%a6%e6%95%b8%e6%93%9a%e6%b7%bb","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187826\/","title":{"rendered":"\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u55ae\u4f4d\u7684\u6280\u5de7 (\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u7d66\u6578\u64da\u6dfb\u52a0\u55ae\u4f4d)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%96%ae%e4%bd%8d%e7%9a%84%e6%8a%80%e5%b7%a7-%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%b5%a6%e6%95%b8%e6%93%9a%e6%b7%bb-udgWKHDDFU\">\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u55ae\u4f4d\u7684\u6280\u5de7 (\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u7d66\u6578\u64da\u6dfb\u52a0\u55ae\u4f4d)<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u548c\u7ba1\u7406\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u7576\u6211\u5011\u8655\u7406\u6578\u64da\u6642\uff0c\u5c24\u5176\u662f\u6d89\u53ca\u5230\u6e2c\u91cf\u548c\u8a08\u91cf\u7684\u6578\u64da\uff0c\u70ba\u6578\u64da\u6dfb\u52a0\u55ae\u4f4d\u662f\u975e\u5e38\u5fc5\u8981\u7684\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u6578\u64da\u7684\u6e05\u6670\u6027\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u7528\u6027\u548c\u6e96\u78ba\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728\u6578\u64da\u5eab\u4e2d\u7d66\u6578\u64da\u6dfb\u52a0\u55ae\u4f4d\u7684\u6280\u5de7\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%96%ae%e4%bd%8d-udgWKHDDFU\">\u70ba\u4ec0\u9ebc\u9700\u8981\u5728\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u55ae\u4f4d<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u55ae\u4f4d\u7684\u4e3b\u8981\u539f\u56e0\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u7684\u53ef\u8b80\u6027\uff1a<\/strong>\u7576\u6578\u64da\u5305\u542b\u55ae\u4f4d\u6642\uff0c\u4f7f\u7528\u8005\u80fd\u5920\u66f4\u5bb9\u6613\u7406\u89e3\u6578\u64da\u7684\u610f\u7fa9\u3002\u4f8b\u5982\uff0c\u5c07\u201c100\u201d\u8207\u201c100\u7c73\u201d\u76f8\u6bd4\uff0c\u5f8c\u8005\u66f4\u5177\u9ad4\u4e14\u6613\u65bc\u7406\u89e3\u3002<\/li>\n<li><strong>\u6578\u64da\u7684\u6e96\u78ba\u6027\uff1a<\/strong>\u5728\u9032\u884c\u8a08\u7b97\u6642\uff0c\u55ae\u4f4d\u7684\u6b63\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002\u932f\u8aa4\u7684\u55ae\u4f4d\u53ef\u80fd\u5c0e\u81f4\u932f\u8aa4\u7684\u7d50\u679c\uff0c\u9032\u800c\u5f71\u97ff\u6c7a\u7b56\u3002<\/li>\n<li><strong>\u8de8\u7cfb\u7d71\u7684\u517c\u5bb9\u6027\uff1a<\/strong>\u4e0d\u540c\u7684\u7cfb\u7d71\u53ef\u80fd\u4f7f\u7528\u4e0d\u540c\u7684\u55ae\u4f4d\uff0c\u70ba\u6578\u64da\u6dfb\u52a0\u55ae\u4f4d\u53ef\u4ee5\u5e6b\u52a9\u5728\u4e0d\u540c\u7cfb\u7d71\u4e4b\u9593\u9032\u884c\u6578\u64da\u4ea4\u63db\u6642\u4fdd\u6301\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%96%ae%e4%bd%8d-udgWKHDDFU\">\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u55ae\u4f4d<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u55ae\u4f4d\u7684\u65b9\u6cd5\u6709\u591a\u7a2e\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6280\u5de7\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e5%96%ae%e4%bd%8d%e5%ad%97%e6%ae%b5-udgWKHDDFU\">1. \u4f7f\u7528\u55ae\u4f4d\u5b57\u6bb5<\/h3>\n<p>\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u5728\u6578\u64da\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u55ae\u4f4d\u5b57\u6bb5\u3002\u9019\u6a23\uff0c\u6bcf\u689d\u6578\u64da\u90fd\u53ef\u4ee5\u6709\u5176\u5c0d\u61c9\u7684\u55ae\u4f4d\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u4e00\u500b\u5b58\u5132\u9577\u5ea6\u7684\u6578\u64da\u8868\uff0c\u53ef\u4ee5\u8a2d\u8a08\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE measurements (\n    id INT PRIMARY KEY,\n    value DECIMAL(10, 2),\n    unit VARCHAR(10)\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c`value`\u5b57\u6bb5\u5b58\u5132\u6578\u503c\uff0c\u800c`unit`\u5b57\u6bb5\u5247\u5b58\u5132\u76f8\u61c9\u7684\u55ae\u4f4d\uff0c\u5982\u201c\u7c73\u201d\u3001\u201c\u516c\u91cc\u201d\u7b49\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e6%9e%9a%e8%88%89%e9%a1%9e%e5%9e%8b-udgWKHDDFU\">2. \u4f7f\u7528\u679a\u8209\u985e\u578b<\/h3>\n<p>\u5982\u679c\u6578\u64da\u7684\u55ae\u4f4d\u662f\u6709\u9650\u7684\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u679a\u8209\u985e\u578b\u4f86\u9650\u5236\u55ae\u4f4d\u7684\u9078\u64c7\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE measurements (\n    id INT PRIMARY KEY,\n    value DECIMAL(10, 2),\n    unit ENUM('\u7c73', '\u516c\u91cc', '\u82f1\u91cc')\n);\n<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u907f\u514d\u56e0\u70ba\u62fc\u5beb\u932f\u8aa4\u6216\u4e0d\u4e00\u81f4\u7684\u55ae\u4f4d\u800c\u5c0e\u81f4\u7684\u554f\u984c\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e5%96%ae%e4%bd%8d%e8%bd%89%e6%8f%9b%e8%a1%a8-udgWKHDDFU\">3. \u4f7f\u7528\u55ae\u4f4d\u8f49\u63db\u8868<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5728\u4e0d\u540c\u55ae\u4f4d\u4e4b\u9593\u9032\u884c\u8f49\u63db\u3002\u9019\u6642\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u55ae\u4f4d\u8f49\u63db\u8868\uff0c\u5b58\u5132\u4e0d\u540c\u55ae\u4f4d\u4e4b\u9593\u7684\u8f49\u63db\u56e0\u5b50\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE unit_conversion (\n    from_unit VARCHAR(10),\n    to_unit VARCHAR(10),\n    conversion_factor DECIMAL(10, 5)\n);\n<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u5728\u67e5\u8a62\u6642\u6839\u64da\u9700\u8981\u9032\u884c\u55ae\u4f4d\u8f49\u63db\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e6%9f%a5%e8%a9%a2%e5%92%8c%e8%bd%89%e6%8f%9b%e5%96%ae%e4%bd%8d-udgWKHDDFU\">\u793a\u4f8b\uff1a\u67e5\u8a62\u548c\u8f49\u63db\u55ae\u4f4d<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b`measurements`\u8868\u548c\u4e00\u500b`unit_conversion`\u8868\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u7372\u53d6\u7279\u5b9a\u55ae\u4f4d\u7684\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT m.value * uc.conversion_factor AS converted_value, uc.to_unit\nFROM measurements m\nJOIN unit_conversion uc ON m.unit = uc.from_unit\nWHERE uc.to_unit = '\u516c\u91cc';\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4ee5\u201c\u516c\u91cc\u201d\u70ba\u55ae\u4f4d\u7684\u6e2c\u91cf\u503c\uff0c\u901a\u904e\u8f49\u63db\u56e0\u5b50\u9032\u884c\u8a08\u7b97\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-udgWKHDDFU\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u70ba\u6578\u64da\u6dfb\u52a0\u55ae\u4f4d\u662f\u63d0\u9ad8\u6578\u64da\u53ef\u8b80\u6027\u548c\u6e96\u78ba\u6027\u7684\u6709\u6548\u65b9\u6cd5\u3002\u901a\u904e\u4f7f\u7528\u55ae\u4f4d\u5b57\u6bb5\u3001\u679a\u8209\u985e\u578b\u548c\u55ae\u4f4d\u8f49\u63db\u8868\u7b49\u6280\u5de7\uff0c\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u6e96\u78ba\u6027\u3002\u9019\u4e9b\u65b9\u6cd5\u4e0d\u50c5\u9069\u7528\u65bc\u9577\u5ea6\u3001\u91cd\u91cf\u7b49\u7269\u7406\u91cf\u7684\u6e2c\u91cf\uff0c\u4e5f\u53ef\u4ee5\u64f4\u5c55\u5230\u5176\u4ed6\u985e\u578b\u7684\u6578\u64da\u4e2d\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u64f4\u5c55\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u6709\u6548\u6dfb\u52a0\u55ae\u4f4d\uff0c\u63d0\u5347\u6578\u64da\u7684\u53ef\u8b80\u6027\u8207\u6e96\u78ba\u6027\uff0c\u78ba\u4fdd\u4fe1\u606f\u7684\u6e05\u6670\u50b3\u9054\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-187826","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187826","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=187826"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187826\/revisions"}],"predecessor-version":[{"id":187827,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187826\/revisions\/187827"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187826"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187826"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}