{"id":6714,"date":"2024-11-14T14:56:28","date_gmt":"2024-11-14T06:56:28","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6714\/"},"modified":"2024-11-14T14:56:28","modified_gmt":"2024-11-14T06:56:28","slug":"mysql-%e4%b8%ad-collate-%e7%9a%84%e7%94%a8%e6%b3%95%ef%bc%9a%e5%a6%82%e4%bd%95%e8%af%86%e5%88%ab%e5%9c%a8%e4%b8%8d%e5%90%8c%e5%ad%97%e7%ac%a6%e9%9b%86%e4%b8%8b%e7%9c%8b%e4%bc%bc%e7%9b%b8%e5%90%8c","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6714\/","title":{"rendered":"MySQL \u4e2d COLLATE \u7684\u7528\u6cd5\uff1a\u5982\u4f55\u8bc6\u522b\u5728\u4e0d\u540c\u5b57\u7b26\u96c6\u4e0b\u770b\u4f3c\u76f8\u540c\u4f46\u5b9e\u9645\u4e0d\u540c\u7684\u8bb0\u5f55\uff1f"},"content":{"rendered":"

\"MySQL<\/p>\n

\u4e2d collate \u7528\u6cd5\u7684\u95ee\u9898<\/strong><\/p>\n

\u5728 mysql \u4e2d\u4f7f\u7528 collate \u65f6\u9047\u5230\u9519\u8bef\uff1f\u8ba9\u6211\u4eec\u6765\u6df1\u5165\u4e86\u89e3\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n

\u60a8\u6709\u4e00\u4e2a\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4f7f\u7528 gbk \u5b57\u7b26\u96c6\u7f16\u7801\u7684 username \u5217\u3002\u5728\u6b64\u5b57\u7b26\u96c6\u4e2d\uff0c”forever” \u548c “f\u00f2r\u0113v\u00e8r” \u88ab\u89c6\u4e3a\u4e0d\u540c\u7684\u5b57\u7b26\u3002\u73b0\u5728\uff0c\u60a8\u5e0c\u671b\u627e\u51fa\u8fd9\u4e9b\u5728 gbk \u4e0b\u770b\u4f3c\u4e0d\u540c\u7684\u8bb0\u5f55\uff0c\u4f46\u5728 utf-8 \u4e0b\u88ab\u89c6\u4e3a\u76f8\u540c\u7684\u8bb0\u5f55\u3002<\/p>\n

\u539f\u59cb\u67e5\u8be2\u4e2d\u4f7f\u7528 collate utf8mb4_general_ci \u5931\u8d25\uff0c\u56e0\u4e3a\u8868\u4e2d\u6570\u636e\u4f7f\u7528 gbk \u7f16\u7801\u3002\u4e3a\u4e86\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528 convert \u51fd\u6570\u5c06 username \u5217\u8f6c\u6362\u4e3a\u4f7f\u7528 utf-8mb4 \u5b57\u7b26\u96c6\u7f16\u7801\u7684\u5b57\u7b26\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u4fee\u6539\u540e\u7684\u67e5\u8be2\uff1a<\/p>\n

select convert(username, char character set utf8mb4) collate utf8mb4_general_ci\n  from test.user\n  group by convert(username, char character set utf8mb4) collate utf8mb4_general_ci;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6b64\u67e5\u8be2\u5c06 username \u5217\u8f6c\u6362\u4e3a utf-8mb4 \u5b57\u7b26\u96c6\uff0c\u7136\u540e\u4f7f\u7528 collate utf8mb4_general_ci \u8fdb\u884c\u5206\u7ec4\u3002\u8fd9\u6837\uff0c\u5728 utf-8 \u4e0b\u88ab\u89c6\u4e3a\u76f8\u540c\u7684\u8bb0\u5f55\u5c06\u88ab\u6b63\u786e\u5730\u5206\u7ec4\u5728\u4e00\u8d77\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662fMySQL \u4e2d COLLATE \u7684\u7528\u6cd5\uff1a\u5982\u4f55\u8bc6\u522b\u5728\u4e0d\u540c\u5b57\u7b26\u96c6\u4e0b\u770b\u4f3c\u76f8\u540c\u4f46\u5b9e\u9645\u4e0d\u540c\u7684\u8bb0\u5f55\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e2d collate \u7528\u6cd5\u7684\u95ee\u9898 \u5728 mysql \u4e2d\u4f7f\u7528 collate \u65f6\u9047\u5230\u9519\u8bef\uff1f\u8ba9\u6211\u4eec\u6765\u6df1\u5165\u4e86\u89e3\u89e3\u51b3\u65b9\u6848\u3002 \u60a8\u6709\u4e00\u4e2a\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4f7f\u7528 gbk \u5b57\u7b26\u96c6\u7f16\u7801\u7684 username \u5217\u3002\u5728\u6b64\u5b57\u7b26\u96c6\u4e2d\uff0c”forever” \u548c “f\u00f2r\u0113v\u00e8r” \u88ab\u89c6\u4e3a\u4e0d\u540c\u7684\u5b57\u7b26\u3002\u73b0\u5728\uff0c\u60a8\u5e0c\u671b\u627e\u51fa\u8fd9\u4e9b\u5728 gbk \u4e0b\u770b\u4f3c\u4e0d\u540c\u7684\u8bb0\u5f55\uff0c\u4f46\u5728 utf-8 \u4e0b\u88ab\u89c6\u4e3a\u76f8\u540c\u7684\u8bb0\u5f55\u3002 \u539f\u59cb\u67e5\u8be2\u4e2d\u4f7f\u7528 collate utf8mb4_general_ci \u5931\u8d25\uff0c\u56e0\u4e3a\u8868\u4e2d\u6570\u636e\u4f7f\u7528 gbk \u7f16\u7801\u3002\u4e3a\u4e86\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528 convert \u51fd\u6570\u5c06 username \u5217\u8f6c\u6362\u4e3a\u4f7f\u7528 utf-8mb4 \u5b57\u7b26\u96c6\u7f16\u7801\u7684\u5b57\u7b26\u3002 \u4ee5\u4e0b\u662f\u4fee\u6539\u540e\u7684\u67e5\u8be2\uff1a select convert(username, char character set utf8mb4) collate utf8mb4_general_ci from test.user group by convert(username, char character set utf8mb4) collate utf8mb4_general_ci; \u767b\u5f55\u540e\u590d\u5236 \u6b64\u67e5\u8be2\u5c06 username […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6714","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6714","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6714"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6714\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6714"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6714"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}