{"id":7432,"date":"2021-07-15T15:51:32","date_gmt":"2021-07-15T07:51:32","guid":{"rendered":"https:\/\/www.gbase8.cn\/?p=7432"},"modified":"2021-07-15T15:51:32","modified_gmt":"2021-07-15T07:51:32","slug":"gbase-8a-%e5%8e%bb%e6%8e%89%e5%bc%80%e5%a4%b4%e5%92%8c%e7%bb%93%e5%b0%be%e7%a9%ba%e6%a0%bc%e6%88%96%e8%87%aa%e5%ae%9a%e5%ad%97%e7%ac%a6%e7%9a%84%e5%87%bd%e6%95%b0trim%e3%80%81ltrim%e3%80%81rtrim","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/7432","title":{"rendered":"\u5357\u5927\u901a\u7528GBase 8a \u53bb\u6389\u5f00\u5934\u548c\u7ed3\u5c3e\u7a7a\u683c\u6216\u81ea\u5b9a\u5b57\u7b26\u7684\u51fd\u6570trim\u3001LTrim\u3001RTrim\u4f7f\u7528"},"content":{"rendered":"<p>\u672c\u6587\u4ecb\u7ecdGBase 8a\u91cc\u5bf9\u5f00\u5934\u548c\u7ed3\u5c3e\u5904\u5b57\u7b26\uff0c\u7279\u522b\u662f\u7a7a\u683c\uff0c\u7684\u5904\u7406\u51fd\u6570trim,ltrim\u548crtrim\u7684\u4f7f\u7528\u65b9\u6cd5\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-6a2ab3d620d61\" 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-6a2ab3d620d61\"  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\/7432\/#%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\/7432\/#%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\/7432\/#%E6%A0%B7%E4%BE%8B\" >\u6837\u4f8b<\/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\/7432\/#%E7%A7%BB%E9%99%A4%E7%A9%BA%E6%A0%BC\" >\u79fb\u9664\u7a7a\u683c<\/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\/7432\/#%E7%A7%BB%E9%99%A4%E6%8C%87%E5%AE%9A%E5%AD%97%E7%AC%A6\" >\u79fb\u9664\u6307\u5b9a\u5b57\u7b26<\/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\/7432\/#%E7%A7%BB%E9%99%A4%E5%A4%9A%E4%B8%AA%E5%AD%97%E7%AC%A6\" >\u79fb\u9664\u591a\u4e2a\u5b57\u7b26<\/a><\/li><\/ul><\/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>TRIM(&#91;{BOTH | LEADING | TRAILING} &#91;trim_char] FROM] str)\u3002\nLTRIM(str)\r\nRTRIM(str)<\/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>\u79fb\u9664\u5b57\u7b26\u4e32 str\u4e2d\u6240\u6709\u7684 trim_char \u524d\u7f00\u6216\u540e\u7f00\uff0c\u7136\u540e\u5c06\u5176\u8fd4\u56de\u3002\u5982\u679c\u6ca1\u6709\u7ed9\u51fa\u4efb\u4f55 BOTH\u3001LEADING \u6216 TRAILING \u4fee\u9970\u7b26\uff0c\u4f1a\u5047\u5b9a\u4e3a BOTH\u3002\u5982\u679c\u6ca1\u6709\u6307\u5b9a trim_char\uff0c\u5c06\u79fb\u9664\u7a7a\u683c\u3002<\/p>\n\n\n\n<p>LTRIM\u548crtrim\u662ftrim\u7684\u5feb\u6377\u5f62\u5f0f,\u79fb\u51fa\u5f00\u5934\u548c\u7ed3\u5c3e\u7684\u7a7a\u683c\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>BOTH \u5f00\u5934\u548c\u7ed3\u5c3e<\/li><li>LEADING \u5f00\u5934\u7684<\/li><li>TRAILING \u7ed3\u5c3e\u7684<\/li><li>trim_char \u8981\u79fb\u9664\u7684\u5b57\u7b26\uff0c\u53ef\u4ee5\u662f\u591a\u4e2a\u3002 \u9ed8\u8ba4\u662f\u7a7a\u683c\u3002<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A0%B7%E4%BE%8B\"><\/span>\u6837\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%A7%BB%E9%99%A4%E7%A9%BA%E6%A0%BC\"><\/span>\u79fb\u9664\u7a7a\u683c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5982\u4e0b\u7684\u5b57\u7b26\u4e32@a,\u524d\u540e\u90fd\u67091\u4e2a\u7a7a\u683c\uff0c\u6837\u4f8b\u5206\u522b\u793a\u4f8b\u4e86\u6ea2\u51fa\u524d\u540e\u7a7a\u683c\uff0c\u79fb\u9664\u5de6\u7a7a\u683c\u548c\u79fb\u9664\u53f3\u7a7a\u683c\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>\u5176\u4e2dltrim\u548crtrim\u53ea\u80fd\u7528\u4e8e\u79fb\u9664\u7a7a\u683c\uff0c\u4e0d\u80fd\u6307\u5b9a\u5b57\u7b26\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase> set @a=' ABC ';\r\nQuery OK, 0 rows affected (Elapsed: 00:00:00.00)\r\n\r\ngbase> select trim(@a),ltrim(@a),rtrim(@a);\r\n+----------+-----------+-----------+\r\n| trim(@a) | ltrim(@a) | rtrim(@a) |\r\n+----------+-----------+-----------+\r\n| ABC      | ABC       |  ABC      |\r\n+----------+-----------+-----------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select trim(@a),length(trim(@a)),ltrim(@a),length(ltrim(@a)),rtrim(@a),length(rtrim(@a));\r\n+----------+------------------+-----------+-------------------+-----------+-------------------+\r\n| trim(@a) | length(trim(@a)) | ltrim(@a) | length(ltrim(@a)) | rtrim(@a) | length(rtrim(@a)) |\r\n+----------+------------------+-----------+-------------------+-----------+-------------------+\r\n| ABC      |                3 | ABC       |                 4 |  ABC      |                 4 |\r\n+----------+------------------+-----------+-------------------+-----------+-------------------+\r\n1 row in set (Elapsed: 00:00:00.00)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%A7%BB%E9%99%A4%E6%8C%87%E5%AE%9A%E5%AD%97%E7%AC%A6\"><\/span>\u79fb\u9664\u6307\u5b9a\u5b57\u7b26<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5982\u4e0b\u4f8b\u5b50\uff0c\u79fb\u9664\u5f00\u5934\u548c\u7ed3\u5c3e\u7684\u524d\u540e\u7684\u5b57\u7b26\u2018A'<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase> set @a='AABBCCBBAA';\r\nQuery OK, 0 rows affected (Elapsed: 00:00:00.00)\r\n\r\ngbase> select trim(both 'A' from @a),trim(leading 'A' from @a),trim(trailing 'A' from @a);\r\n+------------------------+---------------------------+----------------------------+\r\n| trim(both 'A' from @a) | trim(leading 'A' from @a) | trim(trailing 'A' from @a) |\r\n+------------------------+---------------------------+----------------------------+\r\n| BBCCBB                 | BBCCBBAA                  | AABBCCBB                   |\r\n+------------------------+---------------------------+----------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%A7%BB%E9%99%A4%E5%A4%9A%E4%B8%AA%E5%AD%97%E7%AC%A6\"><\/span>\u79fb\u9664\u591a\u4e2a\u5b57\u7b26<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5982\u4e0b\u4f8b\u5b50\u79fb\u9664\u4e86\u591a\u4e2a\u5b57\u7b26\u2019XYZ'<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gbase> set @a='XYZAABBCCBBAAXYZ';\r\nQuery OK, 0 rows affected (Elapsed: 00:00:00.00)\r\n\r\ngbase> select trim(both 'XYZ' from @a),trim(leading 'XYZ' from @a),trim(trailing 'XYZ' from @a);\r\n+--------------------------+-----------------------------+------------------------------+\r\n| trim(both 'XYZ' from @a) | trim(leading 'XYZ' from @a) | trim(trailing 'XYZ' from @a) |\r\n+--------------------------+-----------------------------+------------------------------+\r\n| AABBCCBBAA               | AABBCCBBAAXYZ               | XYZAABBCCBBAA                |\r\n+--------------------------+-----------------------------+------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)<\/code><\/pre>","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u4ecb\u7ecdGBase 8a\u91cc\u5bf9\u5f00\u5934\u548c\u7ed3\u5c3e\u5904\u5b57\u7b26\uff0c\u7279\u522b\u662f\u7a7a\u683c\uff0c\u7684\u5904\u7406\u51fd\u6570trim,ltrim\u548crtrim\u7684\u4f7f\u7528\u65b9\u6cd5\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-7432","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\/7432","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=7432"}],"version-history":[{"count":16,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/7432\/revisions"}],"predecessor-version":[{"id":7448,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/7432\/revisions\/7448"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=7432"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=7432"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=7432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}