{"id":2696,"date":"2020-12-31T14:16:04","date_gmt":"2020-12-31T06:16:04","guid":{"rendered":"https:\/\/www.gbase8.cn\/?p=2696"},"modified":"2020-12-31T14:25:23","modified_gmt":"2020-12-31T06:25:23","slug":"gbase-8a%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b0char%e7%9a%84%e7%94%a8%e6%b3%95%e5%92%8c%e4%bd%bf%e7%94%a8%e4%be%8b%e5%ad%90","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/2696","title":{"rendered":"\u5357\u5927\u901a\u7528GBase 8a\u5b57\u7b26\u4e32\u51fd\u6570char\u7684\u7528\u6cd5\u548c\u4f7f\u7528\u4f8b\u5b50"},"content":{"rendered":"<p>\u672c\u6587\u4ecb\u7ecdGBase 8a\u5b57\u7b26\u4e32\u51fd\u6570char\u7684\u8bed\u6cd5\uff0c\u7528\u6cd5\u8bf4\u660e\u548c\u4f7f\u7528\u4f8b\u5b50\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Directory Navigation<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a2b165ebdd80\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a2b165ebdd80\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#%E8%AF%AD%E6%B3%95\" >\u8bed\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#%E8%AF%B4%E6%98%8E\" >\u8bf4\u660e<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#%E4%BE%8B%E5%AD%90\" >\u4f8b\u5b50<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#ASCII%E5%AD%97%E7%AC%A6\" >ASCII\u5b57\u7b26<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#%E6%B1%89%E5%AD%97\" >\u6c49\u5b57<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#%E7%A9%BA%E5%80%BC\" >\u7a7a\u503c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#NULL%E5%80%BC\" >NULL\u503c<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.gbase8.cn\/en\/2696\/#%E5%8F%82%E8%80%83\" >\u53c2\u8003<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AF%AD%E6%B3%95\"><\/span>\u8bed\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>CHAR(N1,N2...)<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AF%B4%E6%98%8E\"><\/span>\u8bf4\u660e<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>N1,N2\u2026\u4e3a\u6574\u6570\u7c7b\u578b\u53c2\u6570\uff0c\u8fd4\u56de\u76f8\u5e94\u4ee3\u8868\u7684 ASCII \u7801\u503c\u5bf9\u5e94\u7684\u5b57\u7b26\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\uff0c<br>\u5982\u679c\u53c2\u6570\u5217\u8868\u4e2d\u542b\u6709 NULL \u5219\u5ffd\u7565\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BE%8B%E5%AD%90\"><\/span>\u4f8b\u5b50<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ASCII%E5%AD%97%E7%AC%A6\"><\/span>ASCII\u5b57\u7b26<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5bf9\u4e8e\u4e0d\u8d85\u8fc7128\u7684ASCII\u7801\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select char(65,66);\n+-------------+\n| char(65,66) |\n+-------------+\n| AB          |\n+-------------+\n1 row in set (Elapsed: 00:00:00.01)\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%B1%89%E5%AD%97\"><\/span>\u6c49\u5b57<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u672c\u4f8b\u5148\u4f7f\u7528HEX\u62ff\u5230\u6c49\u5b57\u7684\u7f16\u7801\uff0c\u7136\u540e\u7528CHAR\u6765\u53cd\u5411\u6784\u9020\u6c49\u5b57\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select hex('\u5929');\n+------------+\n| hex('\u5929')  |\n+------------+\n| E5A4A9     |\n+------------+\n1 row in set (Elapsed: 00:00:00.01)\ngbase&gt; select char(x'E5',x'A4',x'A9');\n+-------------------------+\n| char(x'E5',x'A4',x'A9') |\n+-------------------------+\n| \u5929                      |\n+-------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%A9%BA%E5%80%BC\"><\/span>\u7a7a\u503c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u7a7a\u503c\u4f1a\u8fd4\u56de\u7a7a\uff0c\u4f46\u6709warnings<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select char('');\n+----------+\n| char('') |\n+----------+\n|          |\n+----------+\n1 row in set, 1 warning (Elapsed: 00:00:00.00)\n\ngbase&gt; show warnings;\n+---------+------+---------------------------------------+\n| Level   | Code | Message                               |\n+---------+------+---------------------------------------+\n| Warning | 1292 | Truncated incorrect INTEGER value: '' |\n+---------+------+---------------------------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"NULL%E5%80%BC\"><\/span>NULL\u503c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>null\u503c\u88ab\u5ffd\u7565\uff0c\u5bf9\u5e94\u4f4d\u7f6e\u8fd4\u56de\u7a7a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase&gt; select char(null);\n+------------+\n| char(null) |\n+------------+\n|            |\n+------------+\n1 row in set (Elapsed: 00:00:00.00)\n\ngbase&gt; select char(51,null,52);\n+------------------+\n| char(51,null,52) |\n+------------------+\n| 34               |\n+------------------+\n1 row in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%82%E8%80%83\"><\/span>\u53c2\u8003<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a class=\"\" href=\"https:\/\/www.gbase8.cn\/en\/2672\/\">GBase 8a\u5b57\u7b26\u4e32\u51fd\u6570\u6c47\u603b\u5217\u8868<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.gbase8.cn\/en\/2527\/\">GBase 8a\u901a\u8fc7hex\u51fd\u6570\u5c0616\u8fdb\u5236\u6570\u8f6c\u5316\u4e3a\u5b57\u7b26\u53ca\u5b57\u7b26\u4e32\u8f6c16\u8fdb\u5236\u6570<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u4ecb\u7ecdGBase 8a\u5b57\u7b26\u4e32\u51fd\u6570char\u7684\u8bed\u6cd5\uff0c\u7528\u6cd5\u8bf4\u660e\u548c\u4f7f\u7528\u4f8b\u5b50\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[36],"class_list":["post-2696","post","type-post","status-publish","format-standard","hentry","category-gbase8a","tag-36"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/2696","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=2696"}],"version-history":[{"count":6,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/2696\/revisions"}],"predecessor-version":[{"id":2708,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/2696\/revisions\/2708"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=2696"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=2696"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=2696"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}