{"id":200854,"date":"2025-05-06T14:27:20","date_gmt":"2025-05-06T06:27:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200854\/"},"modified":"2025-05-06T14:27:20","modified_gmt":"2025-05-06T06:27:20","slug":"gbk-%e8%a1%a8%e4%b8%ad%e5%a6%82%e4%bd%95%e7%94%a8-group-by-%e6%89%be%e5%87%ba-utf-8-%e4%b8%8b%e7%9b%b8%e5%90%8c-username-%e7%9a%84%e8%ae%b0%e5%bd%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200854\/","title":{"rendered":"GBK \u8868\u4e2d\u5982\u4f55\u7528 GROUP BY \u627e\u51fa UTF-8 \u4e0b\u76f8\u540c username \u7684\u8bb0\u5f55\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>GBK \u8868\u4e2d\u5982\u4f55\u7528 GROUP BY \u627e\u51fa UTF-8 \u4e0b\u76f8\u540c username \u7684\u8bb0\u5f55\uff1f<\/h1>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241117\/173182863867399b9e9b2f5.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>mysql \u4e2d collate \u7528\u6cd5\u7684\u56f0\u60d1<\/strong><\/p>\n<p>\u5bf9\u4e8e mysql \u6570\u636e\u5e93\u4e2d\u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u89c4\u5219\u7684\u5904\u7406\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u56f0\u60d1\u3002\u4e0b\u9762\u4ee5 collate \u7528\u6cd5\u4e3a\u4f8b\uff0c\u9488\u5bf9\u4e00\u4e2a\u5177\u4f53\u95ee\u9898\u8fdb\u884c\u89e3\u7b54\u3002<\/p>\n<p><strong>\u95ee\u9898\uff1a<\/strong><\/p>\n<p>\u5728\u4e00\u4e2a gbk \u5b57\u7b26\u96c6\u7684\u8868\u4e2d\uff0c\u5b58\u5728\u4e24\u4e2a username \u503c\uff1aforever \u548c f\u00f2r\u0113v\u00e8r\uff0c\u5b83\u4eec\u5728 gbk \u5b57\u7b26\u96c6\u4e0b\u88ab\u89c6\u4e3a\u4e0d\u540c\u7684\u5b57\u7b26\u3002\u4f46\u5982\u679c\u4f7f\u7528 utf-8 \u5b57\u7b26\u96c6\uff0c\u5219\u5b83\u4eec\u88ab\u8bc6\u522b\u4e3a\u540c\u4e00\u5b57\u7b26\u3002\u73b0\u5728\u9700\u8981\u627e\u51fa\u8868\u4e2d\u6240\u6709 username &#8220;\u76f8\u540c&#8221; \u7684\u8bb0\u5f55\uff0c\u4f46 group by username collate utf8mb4_general_ci \u65e0\u6cd5\u6b63\u5e38\u6267\u884c\u3002\u67e5\u8be2\u662f\u5426\u5b58\u5728\u4e0d\u7528 collate \u66ff\u4ee3\u65b9\u6cd5\u6765\u89e3\u51b3\u6b64\u95ee\u9898\uff1f<\/p>\n<p><strong>\u89e3\u7b54\uff1a<\/strong><\/p>\n<p>\u5f53\u4f7f\u7528 group by \u8bed\u53e5\u65f6\uff0c\u9700\u8981\u786e\u4fdd\u5bf9\u5206\u7ec4\u5408\u5e76\u5217\u8fdb\u884c\u6392\u5e8f\u548c\u6bd4\u8f83\uff0c\u4ee5\u786e\u5b9a\u54ea\u4e9b\u8bb0\u5f55\u5c5e\u4e8e\u540c\u4e00\u7ec4\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u76ee\u6807\u662f\u5728 utf-8 \u5b57\u7b26\u96c6\u4e0b\u6bd4\u8f83 username \u503c\u3002\u7136\u800c\uff0c\u8868\u672c\u8eab\u7684\u5b57\u7b26\u96c6\u662f gbk\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u6bd4\u8f83\u4e0d\u4e00\u81f4\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n<pre>select convert(username, char character set utf8mb4) collate utf8mb4_general_ci\nfrom test.user\ngroup by convert(username, char character set utf8mb4) collate utf8mb4_general_ci;<\/pre>\n<p>\u8be5\u67e5\u8be2\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528 convert() \u51fd\u6570\u5c06 username \u503c\u8f6c\u6362\u4e3a utf-8 \u5b57\u7b26\u96c6\u3002<\/li>\n<li>\u5728\u8f6c\u6362\u4e3a utf-8 \u5b57\u7b26\u96c6\u540e\uff0c\u4f7f\u7528 collate \u5b50\u53e5\u6307\u5b9a utf8mb4_general_ci \u6392\u5e8f\u89c4\u5219\u3002<\/li>\n<li>\u4f7f\u7528 group by \u5b50\u53e5\u5bf9\u8f6c\u6362\u540e\u7684\u503c\u8fdb\u884c\u5206\u7ec4\uff0c\u4ece\u800c\u786e\u4fdd\u5728 utf-8 \u5b57\u7b26\u96c6\u4e0b\u6bd4\u8f83 username \u503c\u3002<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6b63\u786e\u627e\u51fa\u8868\u4e2d username &#8220;\u76f8\u540c&#8221; \u7684\u8bb0\u5f55\uff0c\u800c\u65e0\u9700\u4f7f\u7528 collate \u5b50\u53e5\u5bf9 group by \u8bed\u53e5\u8fdb\u884c\u4fee\u9970\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aGBK \u8868\u4e2d\u5982\u4f55\u7528 GROUP BY \u627e\u51fa UTF-8 \u4e0b\u76f8\u540c username \u7684\u8bb0\u5f55\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6570\u636e\u5e93\u77e5\u8bc6\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>GBK \u8868\u4e2d\u5982\u4f55\u7528 GROUP &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200854","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200854","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200854"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200854\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200854"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200854"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200854"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}