{"id":77700,"date":"2024-10-16T11:03:17","date_gmt":"2024-10-16T03:03:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77700\/"},"modified":"2024-10-16T11:03:17","modified_gmt":"2024-10-16T03:03:17","slug":"mysql%e6%8c%87%e4%bb%a4-ascii%ef%bc%88ascii%e7%a2%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77700\/","title":{"rendered":"MySQL\u6307\u4ee4: ASCII()\uff08ASCII\u78bc\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-ascii%ef%bc%88ascii%e7%a2%bc%ef%bc%89-hFFpmCRkCC\">MySQL\u6307\u4ee4: ASCII()\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\u662fASCII()\u51fd\u6578\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0eASCII()\u51fd\u6578\u7684\u7528\u9014\u3001\u8a9e\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"ascii%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-hFFpmCRkCC\">ASCII()\u51fd\u6578\u6982\u8ff0<\/h2>\n<p>ASCII()\u51fd\u6578\u7528\u65bc\u8fd4\u56de\u6307\u5b9a\u5b57\u7b26\u7684ASCII\u78bc\u3002ASCII\uff08\u7f8e\u570b\u4fe1\u606f\u4ea4\u63db\u6a19\u6e96\u78bc\uff09\u662f\u4e00\u7a2e\u5b57\u7b26\u7de8\u78bc\u6a19\u6e96\uff0c\u5c07\u5b57\u7b26\u6620\u5c04\u5230\u6578\u5b57\u3002\u9019\u5c0d\u65bc\u9700\u8981\u9032\u884c\u5b57\u7b26\u8655\u7406\u6216\u6578\u64da\u8f49\u63db\u7684\u60c5\u6cc1\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"%e8%aa%9e%e6%b3%95-hFFpmCRkCC\">\u8a9e\u6cd5<\/h2>\n<pre><code>ASCII(str)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>str<\/code>\u662f\u8981\u67e5\u8a62\u7684\u5b57\u7b26\u6216\u5b57\u7b26\u4e32\u3002\u51fd\u6578\u5c07\u8fd4\u56de\u8a72\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u500b\u5b57\u7b26\u7684ASCII\u78bc\u3002\u5982\u679c\u5b57\u7b26\u4e32\u70ba\u7a7a\uff0c\u5247\u8fd4\u56de0\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-hFFpmCRkCC\">\u4f7f\u7528\u793a\u4f8b<\/h2>\n<h3 id=\"%e5%9f%ba%e6%9c%ac%e7%a4%ba%e4%be%8b-hFFpmCRkCC\">\u57fa\u672c\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528ASCII()\u51fd\u6578\u4f86\u7372\u53d6\u5b57\u7b26\u7684ASCII\u78bc\uff1a<\/p>\n<pre><code>SELECT ASCII('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>\u9019\u88e1\uff0c\u5b57\u7b26&#8217;A&#8217;\u7684ASCII\u78bc\u662f65\u3002<\/p>\n<h3 id=\"%e8%99%95%e7%90%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6-hFFpmCRkCC\">\u8655\u7406\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26<\/h3>\n<p>\u5982\u679c\u8981\u7372\u53d6\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u500b\u5b57\u7b26\u7684ASCII\u78bc\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT ASCII('Hello') AS ascii_value;<\/code><\/pre>\n<p>\u7d50\u679c\u5c07\u986f\u793a\uff1a<\/p>\n<pre><code>+-------------+\n| ascii_value |\n+-------------+\n|          72 |\n+-------------+<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5b57\u7b26&#8217;H&#8217;\u7684ASCII\u78bc\u662f72\u3002<\/p>\n<h3 id=\"%e7%a9%ba%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84%e8%99%95%e7%90%86-hFFpmCRkCC\">\u7a7a\u5b57\u7b26\u4e32\u7684\u8655\u7406<\/h3>\n<p>\u7576\u50b3\u905e\u4e00\u500b\u7a7a\u5b57\u7b26\u4e32\u6642\uff0cASCII()\u51fd\u6578\u5c07\u8fd4\u56de0\uff1a<\/p>\n<pre><code>SELECT ASCII('') AS ascii_value;<\/code><\/pre>\n<p>\u7d50\u679c\u5c07\u986f\u793a\uff1a<\/p>\n<pre><code>+-------------+\n| ascii_value |\n+-------------+\n|           0 |\n+-------------+<\/code><\/pre>\n<h2 id=\"%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-hFFpmCRkCC\">\u61c9\u7528\u5834\u666f<\/h2>\n<p>ASCII()\u51fd\u6578\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u9a57\u8b49\uff1a<\/strong>\u53ef\u4ee5\u7528\u4f86\u6aa2\u67e5\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5305\u542b\u975eASCII\u5b57\u7b26\uff0c\u9019\u5728\u8655\u7406\u7528\u6236\u8f38\u5165\u6642\u7279\u5225\u91cd\u8981\u3002<\/li>\n<li><strong>\u5b57\u7b26\u8f49\u63db\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u5b57\u7b26\u8f49\u63db\u70ba\u5176ASCII\u78bc\u4ee5\u9032\u884c\u9032\u4e00\u6b65\u7684\u6578\u64da\u8655\u7406\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u6790\uff1a<\/strong>\u5728\u6578\u64da\u5206\u6790\u4e2d\uff0c\u4e86\u89e3\u5b57\u7b26\u7684ASCII\u78bc\u53ef\u4ee5\u5e6b\u52a9\u9032\u884c\u6392\u5e8f\u6216\u6bd4\u8f03\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-hFFpmCRkCC\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684ASCII()\u51fd\u6578\u662f\u4e00\u500b\u7c21\u55ae\u800c\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5728\u8655\u7406\u5b57\u7b26\u6642\u7372\u53d6\u5176ASCII\u78bc\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u9a57\u8b49\u3001\u5b57\u7b26\u8f49\u63db\u9084\u662f\u6578\u64da\u5206\u6790\u4e2d\uff0cASCII()\u51fd\u6578\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u78ba\u4fdd\u60a8\u7684\u6578\u64da\u5b89\u5168\u4e14\u9ad8\u6548\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684ASCII()\u6307\u4ee4\uff0c\u83b7\u53d6\u5b57\u7b26\u7684ASCII\u7801\u503c\uff0c\u7b80\u5316\u6570\u636e\u5904\u7406\u4e0e\u5b57\u7b26\u7f16\u7801\u8f6c\u6362\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-77700","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77700","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=77700"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77700\/revisions"}],"predecessor-version":[{"id":77701,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77700\/revisions\/77701"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}