{"id":705,"date":"2021-07-23T12:43:28","date_gmt":"2021-07-23T04:43:28","guid":{"rendered":"https:\/\/fireinsect.top\/?p=705"},"modified":"2021-07-25T21:06:42","modified_gmt":"2021-07-25T13:06:42","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e5%9f%ba%e7%a1%80%e2%85%a2%ef%bc%88%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%a4%84%e7%90%86%ef%bc%89","status":"publish","type":"post","link":"https:\/\/fireinsect.top\/index.php\/2021\/07\/23\/%e6%95%b0%e6%8d%ae%e5%ba%93%e5%9f%ba%e7%a1%80%e2%85%a2%ef%bc%88%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%a4%84%e7%90%86%ef%bc%89\/","title":{"rendered":"\u6570\u636e\u5e93\u57fa\u7840\u2162\uff08\u5b57\u7b26\u4e32\u5904\u7406\uff09"},"content":{"rendered":"\n<p>\u5728Java\u8bed\u8a00\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406\uff0c\u5728MySQL\u4e2d\uff0c\u6211\u4eec\u540c\u6837\u4e5f\u6709\u8fd9\u6837\u7684\u51fd\u6570\u6765\u5904\u7406\u5b57\u7b26<br>\u4e32\uff0c\u5373\u4f7f\u7528CONCAT\u51fd\u6570\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"has-large-font-size\">concat\u51fd\u6570<\/p>\n\n\n\n<p>\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\"><strong>SELECT<\/strong> column_name1,CONCAT(column_name2,str,column_name3),column_name4 <strong>FROM<\/strong> table_name;<\/code><\/pre>\n\n\n\n<ul class=\"list1 wp-block-list\"><li>\u9996\u5148\u8fd9\u662f\u4e00\u4e2a\u67e5\u8be2\u8bed\u53e5\uff0c\u6700\u57fa\u672c\u7684\u7ed3\u6784\u662f SELECT \u5217\u540d FROM \u8868\u540d<\/li><li>CONCAT\u51fd\u6570\u53ef\u4ee5\u62fc\u63a5\u5217\u540d\uff0c\u4e5f\u53ef\u4ee5\u62fc\u63a5\u5b57\u7b26\u4e32<\/li><li>\u5728\u4f7f\u7528CONCAT\u51fd\u6570\u7684\u65f6\u5019\u53ef\u4ee5\u540c\u65f6\u67e5\u8be2\u5176\u4ed6\u7684\u5217<\/li><li>CONCAT\u51fd\u6570\u7684\u53c2\u6570\u4e4b\u95f4\u7528\u82f1\u6587<span class=\"has-inline-color has-vivid-red-color\"> <strong>, <\/strong><\/span>\u5206\u9694<\/li><\/ul>\n\n\n\n<p>\u6bd4\u5982\u73b0\u5728\u6211\u4eec\u60f3\u67e5\u8be2timi_adc\u8868\u4e2d\u82f1\u96c4\u7684id\uff0c\u4ee5\u53ca\u540d\u5b57+\u80dc\u7387\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528concat\u51fd\u6570\uff0c\u628a\u7ed3\u679c\u7684\u53ef<br>\u9605\u8bfb\u6027\u53d8\u5f97\u66f4\u597d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\"><strong>SELECT<\/strong>\n  id,\n  concat(hero_name, '\u7684\u80dc\u7387\u662f', win_rate)\n<strong>FROM<\/strong>\n  timi_adc;<\/code><\/pre>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u67e5\u8be2\u7ed3\u679c\u6709\u4e00\u5217CONCAT\uff0c\u8f93\u51fa\u7684\u7b2c\u4e00\u6761\u6570\u636e\u662f\uff0c\u540e\u7fbf\u7684\u80dc\u7387\u662f0.4995\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u62fc\u63a5\u7684\u503c\u4e2d\u6709NULL\uff0c\u5219\u7ed3\u679c\u4e00\u5f8b\u4e3aNULL\uff0c\u8fd9\u662fNULL\u672c\u8eab\u7279\u6027\u51b3\u5b9a\u7684\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u522b\u540d<\/p>\n\n\n\n<p>\u6211\u4eec\u4f18\u5316\u62fc\u63a5\u7684\u7ed3\u679c\uff0c\u7ed9\u4ed6\u8d77\u4e00\u4e2a\u522b\u540d\uff0c\u6bd4\u5982\u6211\u5e0c\u671b\u67e5\u8be2\u7ed3\u679c\u7684\u5217\u540d\u53ebresult\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\"><strong>SELECT<\/strong>\n  concat(hero_name, '\u7684\u80dc\u7387\u662f', win_rate) <strong>as<\/strong> <strong>result<\/strong>\n<strong>FROM<\/strong>\n  timi_adc\n<strong>WHERE<\/strong>\n  id = 3;<\/code><\/pre>\n\n\n\n<p class=\"has-large-font-size\">TRIM\u51fd\u6570<\/p>\n\n\n\n<p>\u6570\u636e\u5e93\u8bb0\u5f55\u7684\u662f\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\uff0c\u7528\u6237\u8f93\u5165\u65f6\u7684\u6570\u636e\u901a\u5e38\u4e0d\u662f\u6211\u4eec\u6240\u9884\u671f\u7684\uff0c\u6709\u65f6\u5019\u5b83\u4f1a\u5305\u542b\u7a7a\u683c\u7b49\u6211<br>\u4eec\u5e76\u4e0d\u9700\u8981\u7684\u5b57\u7b26\uff0c\u4ece\u800c\u4ea7\u751f\u810f\u6570\u636e\uff0c\u4e3a\u4e86\u4fdd\u6301\u6570\u636e\u7684\u683c\u5f0f\u6b63\u786e\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u4f7f\u7528TRIM\u51fd\u6570\u6765\u6e05\u7406\u6570<br>\u636e\u3002<\/p>\n\n\n\n<p>\u5982\u4f7f\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\"><strong>SELECT<\/strong>\n  trim(hero_name),\n  trim(fever)\n<strong>FROM<\/strong>\n  timi_adc\n<strong>WHERE<\/strong>\n  id = 20;<\/code><\/pre>\n\n\n\n<p>\u5219\u5728\u6700\u540e\u67e5\u627e\u51fa\u7684hero_name\u548cfever\u7684\u7ed3\u679c\u4f1a\u81ea\u52a8\u53bb\u6389\u7a7a\u683c<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u8bed\u6cd5\u62d3\u5c55<\/p>\n\n\n\n<p>trim()\u51fd\u6570\u4e5f\u53ef\u4ee5\u7cbe\u51c6\u7684\u53bb\u6389\u524d\u9762\u6216\u8005\u540e\u9762\u7684\u7a7a\u683c\uff0c\u6216\u8005\u5176\u4ed6\u7684\u5b57\u7b26\uff0c\u8bed\u6cd5\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">TRIM( <strong>BOTH<\/strong>|<strong>LEADING<\/strong>|<strong>TRAILING<\/strong> removed_str <strong>FROM<\/strong> str);<\/code><\/pre>\n\n\n\n<ul class=\"list1 wp-block-list\"><li>TRIM\u51fd\u6570\u53ef\u4ee5\u52a0\u4e0aLEADING\u6765\u53ea\u9664\u53bb\u524d\u9762\u7684\u7a7a\u683c\uff0c\u6216\u8005\u52a0\u4e0aTRAILING\u6765\u53ea\u9664\u53bb\u540e\u9762\u7684\u7a7a\u683c\uff0c\u5982\u679c\u90fd\u4e0d\u52a0\uff0c\u5219\u9ed8\u8ba4\u662fBOTH\u3002<\/li><li>TRIM\u51fd\u6570\u53ef\u4ee5\u5220\u9664\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u5185\u5bb9\uff0c\u5982\u679c\u4e0d\u52a0\uff0c\u5219\u9ed8\u8ba4\u5220\u9664\u7a7a\u683c\u3002<\/li><\/ul>\n\n\n\n<p>\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\"><strong>SELECT<\/strong>\n  TRIM(\n    <strong>TRAILING<\/strong> 'Q'\n    <strong>FROM<\/strong>\n      fever\n  )\n<strong>FROM<\/strong>\n  timi_adc<\/code><\/pre>\n\n\n\n<p>\u5373\u53bb\u6389fever\u5c3e\u90e8\u7684Q<\/p>\n\n\n\n<p class=\"has-large-font-size\">REPLACE\u51fd\u6570<\/p>\n\n\n\n<p>TRIM()\u51fd\u6570\u4e0d\u80fd\u53bb\u6389\u5b57\u7b26\u4e32\u4e2d\u95f4\u7684\u503c\uff0c\u5982\u679c\u8981\u4fee\u6539\u4e2d\u95f4\u7684\u503c\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528REPLACE()\u51fd\u6570\uff0c\u5b83\u7684\u8bed\u6cd5<br>\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">UPDATE table_name \n<strong>SET<\/strong> colunm_name = \nREPLACE(column_name,string_find,string_to_replace) \n<strong>WHERE<\/strong> conditions;<\/code><\/pre>\n\n\n\n<p>\u5927\u5bb6\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u8bed\u6cd5\u5f88\u590d\u6742\uff0c\u5b83\u53ef\u4ee5\u628a\u627e\u5230\u7684\u67d0\u4e2a\u5b57\u7b26\u4e32\u66ff\u6362\u6210\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5176\u5b9e\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u7528<br>UPDATE\u8bed\u53e5\u4fee\u6539\uff0c\u6240\u4ee5REPLACE()\u51fd\u6570\u7684\u5b9e\u7528\u6027\u5e76\u4e0d\u9ad8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u8bed\u8a00\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406\uff0c\u5728MySQL\u4e2d\uff0c\u6211\u4eec\u540c\u6837\u4e5f\u6709\u8fd9\u6837\u7684\u51fd\u6570\u6765\u5904\u7406\u5b57\u7b26\u4e32\uff0c\u5373\u4f7f\u7528CON [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":""},"categories":[6,1],"tags":[],"class_list":["post-705","post","type-post","status-publish","format-standard","hentry","category-6","category-wcd"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/705"}],"collection":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/comments?post=705"}],"version-history":[{"count":4,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/705\/revisions"}],"predecessor-version":[{"id":711,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/705\/revisions\/711"}],"wp:attachment":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/media?parent=705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/categories?post=705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/tags?post=705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}