{"id":180608,"date":"2024-11-09T11:41:19","date_gmt":"2024-11-09T03:41:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180608\/"},"modified":"2024-11-09T11:41:19","modified_gmt":"2024-11-09T03:41:19","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%85%a7%e7%9a%84char%e9%a1%9e%e5%9e%8b-mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%85%a7%e7%9a%84char","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180608\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790MySQL\u6578\u64da\u5eab\u5167\u7684Char\u985e\u578b (mysql\u6578\u64da\u5eab\u5167\u7684char)"},"content":{"rendered":"<h1 id=\"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%85%a7%e7%9a%84char%e9%a1%9e%e5%9e%8b-LtvasxWiGN\">\u6df1\u5165\u89e3\u6790MySQL\u6578\u64da\u5eab\u5167\u7684Char\u985e\u578b<\/h1>\n<p>\u5728MySQL\u6578\u64da\u5eab\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u5c0d\u65bc\u6578\u64da\u7684\u5b58\u5132\u548c\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u5176\u4e2d\uff0c<code>CHAR<\/code>\u985e\u578b\u662f\u4e00\u7a2e\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u6578\u64da\u985e\u578b\uff0c\u9069\u5408\u7528\u65bc\u5b58\u5132\u9577\u5ea6\u4e00\u81f4\u7684\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684<code>CHAR<\/code>\u985e\u578b\uff0c\u5305\u62ec\u5176\u7279\u6027\u3001\u4f7f\u7528\u5834\u666f\u3001\u512a\u7f3a\u9ede\u4ee5\u53ca\u8207\u5176\u4ed6\u5b57\u7b26\u4e32\u985e\u578b\u7684\u6bd4\u8f03\u3002<\/p>\n<h2 id=\"char%e9%a1%9e%e5%9e%8b%e7%9a%84%e7%89%b9%e6%80%a7-LtvasxWiGN\">CHAR\u985e\u578b\u7684\u7279\u6027<\/h2>\n<p><code>CHAR<\/code>\u985e\u578b\u7684\u4e3b\u8981\u7279\u6027\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u56fa\u5b9a\u9577\u5ea6\uff1a<\/strong>\u7121\u8ad6\u5be6\u969b\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u5982\u4f55\uff0c<code>CHAR(n)<\/code>\u59cb\u7d42\u4f54\u7528<code>n<\/code>\u500b\u5b57\u7bc0\u3002\u5982\u679c\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u5c11\u65bc<code>n<\/code>\u500b\u5b57\u7b26\uff0cMySQL\u6703\u81ea\u52d5\u5728\u5b57\u7b26\u4e32\u7684\u53f3\u5074\u586b\u5145\u7a7a\u683c\u4ee5\u9054\u5230\u56fa\u5b9a\u9577\u5ea6\u3002<\/li>\n<li><strong>\u5b57\u7b26\u96c6\u652f\u6301\uff1a<\/strong>MySQL\u652f\u6301\u591a\u7a2e\u5b57\u7b26\u96c6\uff0c<code>CHAR<\/code>\u985e\u578b\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9078\u64c7\u5408\u9069\u7684\u5b57\u7b26\u96c6\uff0c\u4f8b\u5982UTF-8\u6216Latin1\u3002<\/li>\n<li><strong>\u6027\u80fd\u512a\u52e2\uff1a<\/strong>\u7531\u65bc<code>CHAR<\/code>\u985e\u578b\u7684\u56fa\u5b9a\u9577\u5ea6\u7279\u6027\uff0c\u67e5\u8a62\u6027\u80fd\u901a\u5e38\u512a\u65bc\u53ef\u8b8a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u985e\u578b\uff08\u5982<code>VARCHAR<\/code>\uff09\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u983b\u7e41\u9032\u884c\u6bd4\u8f03\u64cd\u4f5c\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-LtvasxWiGN\">\u4f7f\u7528\u5834\u666f<\/h2>\n<p><code>CHAR<\/code>\u985e\u578b\u9069\u5408\u7528\u65bc\u4ee5\u4e0b\u5834\u666f\uff1a<\/p>\n<ul>\n<li>\u5b58\u5132\u9577\u5ea6\u56fa\u5b9a\u7684\u6578\u64da\uff0c\u4f8b\u5982\u570b\u5bb6\u4ee3\u78bc\uff08\u5982\u201cHK\u201d\uff09\u3001\u6027\u5225\uff08\u5982\u201cM\u201d\u6216\u201cF\u201d\uff09\u7b49\u3002<\/li>\n<li>\u9700\u8981\u9ad8\u6548\u67e5\u8a62\u7684\u5b57\u6bb5\uff0c\u7279\u5225\u662f\u5728\u7d22\u5f15\u4e2d\u4f7f\u7528\u7684\u5b57\u6bb5\u3002<\/li>\n<li>\u5c0d\u65bc\u9700\u8981\u7d93\u5e38\u9032\u884c\u5b57\u7b26\u4e32\u6bd4\u8f03\u7684\u60c5\u6cc1\uff0c<code>CHAR<\/code>\u985e\u578b\u80fd\u5920\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%84%aa%e7%bc%ba%e9%bb%9e%e5%88%86%e6%9e%90-LtvasxWiGN\">\u512a\u7f3a\u9ede\u5206\u6790<\/h2>\n<h3 id=\"%e5%84%aa%e9%bb%9e-LtvasxWiGN\">\u512a\u9ede<\/h3>\n<ul>\n<li><strong>\u6027\u80fd\u512a\u8d8a\uff1a<\/strong>\u7531\u65bc<code>CHAR<\/code>\u985e\u578b\u7684\u56fa\u5b9a\u9577\u5ea6\uff0c\u6578\u64da\u7684\u5b58\u53d6\u901f\u5ea6\u8f03\u5feb\uff0c\u7279\u5225\u662f\u5728\u7d22\u5f15\u67e5\u8a62\u6642\u3002<\/li>\n<li><strong>\u7c21\u55ae\u6613\u7528\uff1a<\/strong>\u5c0d\u65bc\u9577\u5ea6\u56fa\u5b9a\u7684\u6578\u64da\uff0c\u4f7f\u7528<code>CHAR<\/code>\u985e\u578b\u53ef\u4ee5\u7c21\u5316\u6578\u64da\u7684\u8655\u7406\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%bc%ba%e9%bb%9e-LtvasxWiGN\">\u7f3a\u9ede<\/h3>\n<ul>\n<li><strong>\u7a7a\u9593\u6d6a\u8cbb\uff1a<\/strong>\u5982\u679c\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u9060\u5c0f\u65bc\u5b9a\u7fa9\u7684\u9577\u5ea6\uff0c\u5c07\u6703\u9020\u6210\u7a7a\u9593\u7684\u6d6a\u8cbb\u3002\u4f8b\u5982\uff0c\u5b9a\u7fa9<code>CHAR(10)<\/code>\u4f46\u53ea\u5b58\u51325\u500b\u5b57\u7b26\uff0c\u5c07\u6d6a\u8cbb5\u500b\u5b57\u7bc0\u3002<\/li>\n<li><strong>\u4e0d\u9748\u6d3b\uff1a<\/strong>\u5c0d\u65bc\u9577\u5ea6\u4e0d\u56fa\u5b9a\u7684\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528<code>CHAR<\/code>\u985e\u578b\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u56e0\u70ba\u6bcf\u6b21\u90fd\u9700\u8981\u586b\u5145\u7a7a\u683c\u3002<\/li>\n<\/ul>\n<h2 id=\"char%e8%88%87%e5%85%b6%e4%bb%96%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%a1%9e%e5%9e%8b%e7%9a%84%e6%af%94%e8%bc%83-LtvasxWiGN\">CHAR\u8207\u5176\u4ed6\u5b57\u7b26\u4e32\u985e\u578b\u7684\u6bd4\u8f03<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u9664\u4e86<code>CHAR<\/code>\u985e\u578b\uff0c\u9084\u6709<code>VARCHAR<\/code>\u548c<code>TEXT<\/code>\u7b49\u5b57\u7b26\u4e32\u985e\u578b\u3002\u4ee5\u4e0b\u662f\u5b83\u5011\u4e4b\u9593\u7684\u6bd4\u8f03\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u6578\u64da\u985e\u578b<\/th>\n<th>\u9577\u5ea6<\/th>\n<th>\u5b58\u5132\u65b9\u5f0f<\/th>\n<th>\u6027\u80fd<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>CHAR<\/td>\n<td>\u56fa\u5b9a\u9577\u5ea6<\/td>\n<td>\u6bcf\u884c\u56fa\u5b9a\u5b57\u7bc0<\/td>\n<td>\u67e5\u8a62\u6027\u80fd\u8f03\u597d<\/td>\n<\/tr>\n<tr>\n<td>VARCHAR<\/td>\n<td>\u53ef\u8b8a\u9577\u5ea6<\/td>\n<td>\u6bcf\u884c\u53ef\u8b8a\u5b57\u7bc0<\/td>\n<td>\u5b58\u5132\u6548\u7387\u8f03\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>TEXT<\/td>\n<td>\u6700\u592765535\u5b57\u7bc0<\/td>\n<td>\u5916\u90e8\u5b58\u5132<\/td>\n<td>\u67e5\u8a62\u6027\u80fd\u8f03\u5dee<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"%e7%b5%90%e8%ab%96-LtvasxWiGN\">\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u7684\u4f86\u8aaa\uff0c<code>CHAR<\/code>\u985e\u578b\u5728MySQL\u6578\u64da\u5eab\u4e2d\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u6578\u64da\u985e\u578b\uff0c\u7279\u5225\u9069\u5408\u7528\u65bc\u5b58\u5132\u9577\u5ea6\u56fa\u5b9a\u7684\u5b57\u7b26\u4e32\u3002\u96d6\u7136\u5b83\u5728\u7a7a\u9593\u5229\u7528\u4e0a\u53ef\u80fd\u4e0d\u5982<code>VARCHAR<\/code>\u9748\u6d3b\uff0c\u4f46\u5728\u6027\u80fd\u65b9\u9762\u537b\u6709\u5176\u7368\u7279\u7684\u512a\u52e2\u3002\u5728\u9078\u64c7\u6578\u64da\u985e\u578b\u6642\uff0c\u958b\u767c\u8005\u61c9\u6839\u64da\u5177\u9ad4\u9700\u6c42\u4f86\u9078\u64c7\u6700\u5408\u9069\u7684\u985e\u578b\uff0c\u4ee5\u9054\u5230\u6700\u4f73\u7684\u6027\u80fd\u548c\u5b58\u5132\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a 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