{"id":79400,"date":"2024-10-16T13:00:59","date_gmt":"2024-10-16T05:00:59","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79400\/"},"modified":"2024-10-16T13:00:59","modified_gmt":"2024-10-16T05:00:59","slug":"mysql%e6%8c%87%e4%bb%a4-ord%ef%bc%88ascii%e7%a2%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79400\/","title":{"rendered":"MySQL\u6307\u4ee4: ORD()\uff08ASCII\u78bc\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-ord%ef%bc%88ascii%e7%a2%bc%ef%bc%89-GQwPpDCeko\">MySQL\u6307\u4ee4: ORD()\uff08ASCII\u78bc\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u5f37\u5927\u7684\u6307\u4ee4\u4f86\u8655\u7406\u6578\u64da\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662fORD()\u51fd\u6578\u3002ORD()\u51fd\u6578\u7684\u4e3b\u8981\u7528\u9014\u662f\u8fd4\u56de\u6307\u5b9a\u5b57\u7b26\u7684ASCII\u78bc\uff0c\u9019\u5728\u8655\u7406\u5b57\u7b26\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"ord%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-GQwPpDCeko\">ORD()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>ORD()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ORD(string)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>string<\/code>\u662f\u8981\u67e5\u8a62\u7684\u5b57\u7b26\u6216\u5b57\u7b26\u4e32\u3002ORD()\u51fd\u6578\u5c07\u8fd4\u56de\u8a72\u5b57\u7b26\u7684ASCII\u78bc\u3002\u5982\u679c\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u591a\u500b\u5b57\u7b26\uff0cORD()\u51fd\u6578\u50c5\u8fd4\u56de\u7b2c\u4e00\u500b\u5b57\u7b26\u7684ASCII\u78bc\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-GQwPpDCeko\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528ORD()\u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b1-%e7%8d%b2%e5%8f%96%e5%96%ae%e5%80%8b%e5%ad%97%e7%ac%a6%e7%9a%84ascii%e7%a2%bc-GQwPpDCeko\">\u7bc4\u4f8b1: \u7372\u53d6\u55ae\u500b\u5b57\u7b26\u7684ASCII\u78bc<\/h3>\n<pre><code>SELECT ORD('A') AS ascii_value;<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u7d50\u679c\u5c07\u986f\u793a\uff1a<\/p>\n<pre><code>+-------------+\n| ascii_value |\n+-------------+\n|          65 |\n+-------------+<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5b57\u7b26&#8217;A&#8217;\u7684ASCII\u78bc\u662f65\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b2-%e7%8d%b2%e5%8f%96%e5%ad%97%e7%ac%a6%e4%b8%b2%e4%b8%ad%e7%ac%ac%e4%b8%80%e5%80%8b%e5%ad%97%e7%ac%a6%e7%9a%84ascii%e7%a2%bc-GQwPpDCeko\">\u7bc4\u4f8b2: \u7372\u53d6\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u500b\u5b57\u7b26\u7684ASCII\u78bc<\/h3>\n<pre><code>SELECT ORD('Hello') AS ascii_value;<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\u7684\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n<pre><code>+-------------+\n| ascii_value |\n+-------------+\n|          72 |\n+-------------+<\/code><\/pre>\n<p>\u9019\u88e1\uff0c\u5b57\u7b26\u4e32&#8217;Hello&#8217;\u7684\u7b2c\u4e00\u500b\u5b57\u7b26&#8217;H&#8217;\u7684ASCII\u78bc\u662f72\u3002<\/p>\n<h2 id=\"ord%e5%87%bd%e6%95%b8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-GQwPpDCeko\">ORD()\u51fd\u6578\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>ORD()\u51fd\u6578\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u9a57\u8b49\uff1a<\/strong>\u5728\u8655\u7406\u7528\u6236\u8f38\u5165\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528ORD()\u51fd\u6578\u4f86\u6aa2\u67e5\u5b57\u7b26\u662f\u5426\u5728\u7279\u5b9a\u7bc4\u570d\u5167\uff0c\u4f8b\u5982\u6aa2\u67e5\u662f\u5426\u70ba\u5b57\u6bcd\u6216\u6578\u5b57\u3002<\/li>\n<li><strong>\u5b57\u7b26\u6392\u5e8f\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6839\u64da\u5b57\u7b26\u7684ASCII\u78bc\u9032\u884c\u6392\u5e8f\u53ef\u80fd\u6703\u66f4\u6709\u6548\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u975e\u6a19\u6e96\u5b57\u7b26\u96c6\u6642\u3002<\/li>\n<li><strong>\u52a0\u5bc6\u548c\u89e3\u5bc6\uff1a<\/strong>\u5728\u7c21\u55ae\u7684\u52a0\u5bc6\u7b97\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528ORD()\u51fd\u6578\u4f86\u7372\u53d6\u5b57\u7b26\u7684ASCII\u78bc\uff0c\u7136\u5f8c\u9032\u884c\u6578\u5b78\u904b\u7b97\u4ee5\u751f\u6210\u52a0\u5bc6\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-GQwPpDCeko\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u4f7f\u7528ORD()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>ORD()\u51fd\u6578\u50c5\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u500b\u5b57\u7b26\u7684ASCII\u78bc\uff0c\u5c0d\u65bc\u591a\u5b57\u7b26\u5b57\u7b26\u4e32\uff0c\u50c5\u8003\u616e\u7b2c\u4e00\u500b\u5b57\u7b26\u3002<\/li>\n<li>\u5982\u679c\u50b3\u5165\u7684\u5b57\u7b26\u4e32\u70ba\u7a7a\uff0cORD()\u51fd\u6578\u5c07\u8fd4\u56deNULL\u3002<\/li>\n<li>ORD()\u51fd\u6578\u50c5\u9069\u7528\u65bc\u55ae\u5b57\u7bc0\u5b57\u7b26\uff0c\u5c0d\u65bc\u591a\u5b57\u7bc0\u5b57\u7b26\uff08\u5982\u67d0\u4e9bUnicode\u5b57\u7b26\uff09\uff0c\u53ef\u80fd\u7121\u6cd5\u6b63\u78ba\u8fd4\u56deASCII\u78bc\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-GQwPpDCeko\">\u7e3d\u7d50<\/h2>\n<p>ORD()\u51fd\u6578\u662f\u4e00\u500b\u7c21\u55ae\u800c\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728MySQL\u4e2d\u8655\u7406\u5b57\u7b26\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u9a57\u8b49\u3001\u5b57\u7b26\u6392\u5e8f\u9084\u662f\u52a0\u5bc6\u89e3\u5bc6\u65b9\u9762\uff0cORD()\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u6709\u50f9\u503c\u7684\u652f\u6301\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u4e86\u89e3\u548c\u638c\u63e1ORD()\u51fd\u6578\u7684\u4f7f\u7528\u5c07\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4ORD()\uff0c\u7528\u65bc\u7372\u53d6\u5b57\u5143\u7684ASCII\u78bc\uff0c\u7c21\u5316\u6578\u64da\u8655\u7406\u8207\u5b57\u7b26\u5206\u6790\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-79400","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79400","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=79400"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79400\/revisions"}],"predecessor-version":[{"id":79401,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79400\/revisions\/79401"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}