{"id":1733,"date":"2019-08-09T13:30:12","date_gmt":"2019-08-09T05:30:12","guid":{"rendered":"https:\/\/www.xiaobo.li\/?p=1733"},"modified":"2019-08-09T13:32:31","modified_gmt":"2019-08-09T05:32:31","slug":"mysql%e4%b8%ad%e7%9a%84utf8mb4%e3%80%81utf8mb4_unicode_ci%e3%80%81utf8mb4_general_ci","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/1733","title":{"rendered":"mysql\u4e2d\u7684utf8mb4\u3001utf8mb4_unicode_ci\u3001utf8mb4_general_ci"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"utf8\u4e0eutf8mb4utf8-most-bytes-4\">1.utf8\u4e0eutf8mb4\uff08utf8 most bytes 4\uff09<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>MySQL 5.5.3\u4e4b\u540e\u589e\u52a0\u4e86utfmb4\u5b57\u7b26\u7f16\u7801<\/li><li>\u652f\u6301BMP\uff08Basic Multilingual Plane\uff0c\u57fa\u672c\u591a\u6587\u79cd\u5e73\u9762\uff09\u548c\u8865\u5145\u5b57\u7b26<\/li><li>\u6700\u591a\u4f7f\u7528\u56db\u4e2a\u5b57\u8282\u5b58\u50a8\u5b57\u7b26<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">utf8mb4\u662futf8\u7684\u8d85\u96c6\u5e76\u5b8c\u5168\u517c\u5bb9utf8\uff0c\u80fd\u591f\u7528\u56db\u4e2a\u5b57\u8282\u5b58\u50a8\u66f4\u591a\u7684\u5b57\u7b26\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6807\u51c6\u7684UTF-8\u5b57\u7b26\u96c6\u7f16\u7801\u662f\u53ef\u4ee5\u4f7f\u75281-4\u4e2a\u5b57\u8282\u53bb\u7f16\u780121\u4f4d\u5b57\u7b26\uff0c\u8fd9\u51e0\u4e4e\u5305\u542b\u4e86\u4e16\u754c\u4e0a\u6240\u6709\u80fd\u770b\u89c1\u7684\u8bed\u8a00\u3002<br>\n<strong>MySQL\u91cc\u9762\u5b9e\u73b0\u7684utf8\u6700\u957f\u4f7f\u75283\u4e2a\u5b57\u7b26<\/strong>\uff0c\u5305\u542b\u4e86\u5927\u591a\u6570\u5b57\u7b26\u4f46\u5e76\u4e0d\u662f\u6240\u6709\u3002\u4f8b\u5982emoji\u548c\u4e00\u4e9b\u4e0d\u5e38\u7528\u7684\u6c49\u5b57\uff0c\u5982\u201c\u5885\u201d\uff0c\u8fd9\u4e9b\u9700\u8981\u56db\u4e2a\u5b57\u8282\u624d\u80fd\u7f16\u7801\u7684\u5c31\u4e0d\u652f\u6301\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u5b57\u7b26\u96c6\u8fde\u63a5\u5b57\u7b26\u96c6\u6392\u5e8f\u5b57\u7b26\u96c6\">2.\u5b57\u7b26\u96c6\u3001\u8fde\u63a5\u5b57\u7b26\u96c6\u3001\u6392\u5e8f\u5b57\u7b26\u96c6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">utf8mb4\u5bf9\u5e94\u7684\u6392\u5e8f\u5b57\u7b26\u96c6\u6709utf8mb4_unicode_ci\u3001utf8mb4_general_ci.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">utf8mb4_unicode_ci\u548cutf8mb4_general_ci\u7684\u5bf9\u6bd4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u51c6\u786e\u6027\uff1a\n<ul><li>utf8mb4_unicode_ci\u662f\u57fa\u4e8e\u6807\u51c6\u7684Unicode\u6765\u6392\u5e8f\u548c\u6bd4\u8f83\uff0c\u80fd\u591f\u5728\u5404\u79cd\u8bed\u8a00\u4e4b\u95f4\u7cbe\u786e\u6392\u5e8f<\/li><li>utf8mb4_general_ci\u6ca1\u6709\u5b9e\u73b0Unicode\u6392\u5e8f\u89c4\u5219\uff0c\u5728\u9047\u5230\u67d0\u4e9b\u7279\u6b8a\u8bed\u8a00\u6216\u8005\u5b57\u7b26\u96c6\uff0c\u6392\u5e8f\u7ed3\u679c\u53ef\u80fd\u4e0d\u4e00\u81f4\u3002<\/li><li>\u4f46\u662f\uff0c\u5728\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e9b\u7279\u6b8a\u5b57\u7b26\u7684\u987a\u5e8f\u5e76\u4e0d\u9700\u8981\u90a3\u4e48\u7cbe\u786e\u3002<\/li><\/ul><\/li><li>\u6027\u80fd\n<ul><li>utf8mb4_general_ci\u5728\u6bd4\u8f83\u548c\u6392\u5e8f\u7684\u65f6\u5019\u66f4\u5feb<\/li><li>utf8mb4_unicode_ci\u5728\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0cUnicode\u6392\u5e8f\u89c4\u5219\u4e3a\u4e86\u80fd\u591f\u5904\u7406\u7279\u6b8a\u5b57\u7b26\u7684\u60c5\u51b5\uff0c\u5b9e\u73b0\u4e86\u7565\u5fae\u590d\u6742\u7684\u6392\u5e8f\u7b97\u6cd5\u3002<\/li><li>\u4f46\u662f\u5728\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u53d1\uff0c\u4e0d\u4f1a\u53d1\u751f\u6b64\u7c7b\u590d\u6742\u6bd4\u8f83\u3002\u76f8\u6bd4\u9009\u62e9\u54ea\u4e00\u79cdcollation\uff0c\u4f7f\u7528\u8005\u66f4\u5e94\u8be5\u5173\u5fc3\u5b57\u7b26\u96c6\u4e0e\u6392\u5e8f\u89c4\u5219\u5728db\u91cc\u9700\u8981\u7edf\u4e00\u3002<\/li><\/ul><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\n\n\n\u4f5c\u8005\uff1a<a href=\"http:\/\/www.cnblogs.com\/amyzhu\/\">AmyZYX  <\/a><br>\n\u51fa\u5904\uff1a<a href=\"http:\/\/www.cnblogs.com\/amyzhu\/\">http:\/\/www.cnblogs.com\/amyzhu\/ <\/a><br>\n\u672c\u6587\u7248\u6743\u5f52\u4f5c\u8005\u548c\u535a\u5ba2\u56ed\u5171\u6709\uff0c\u6b22\u8fce\u8f6c\u8f7d\uff0c\u4f46\u672a\u7ecf\u4f5c\u8005\u540c\u610f\u5fc5\u987b\u4fdd\u7559\u6b64\u6bb5\u58f0\u660e\uff0c\u4e14\u5728\u6587\u7ae0\u9875\u9762\u660e\u663e\u4f4d\u7f6e\u7ed9\u51fa\u539f\u6587\u8fde\u63a5\uff0c\u5426\u5219\u4fdd\u7559\u8ffd\u7a76\u6cd5\u5f8b\u8d23\u4efb\u7684\u6743\u5229\u3002\n\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">================================================================<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">UTF-8\u662f\u4f7f\u75281~4\u4e2a\u5b57\u8282\uff0c\u4e00\u79cd\u53d8\u957f\u7684\u7f16\u7801\u683c\u5f0f\uff0c\u5b57\u7b26\u7f16\u7801\u3002mb4\u5373 most bytes 4\uff0c\u4f7f\u75284\u4e2a\u5b57\u8282\u6765\u8868\u793a\u5b8c\u6574\u7684UTF-8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">mysql\u7684 utf8 \u7f16\u7801\u6700\u5927\u5b57\u7b26\u957f\u5ea6\u4e3a 3 \u5b57\u8282\uff0c\u5982\u679c\u9047\u5230 4 \u5b57\u8282\u7684\u5bbd\u5b57\u7b26\u5c31\u4f1a\u63d2\u5165\u5f02\u5e38\u4e86\u3002\u4e09\u4e2a\u5b57\u8282\u7684 UTF-8 \u6700\u5927\u80fd\u7f16\u7801\u7684 Unicode \u5b57\u7b26\u662f 0xffff\uff0c\u4e5f\u5c31\u662f Unicode \u4e2d\u7684\u57fa\u672c\u591a\u6587\u79cd\u5e73\u9762(BMP)\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u4efb\u4f55\u4e0d\u5728\u57fa\u672c\u591a\u6587\u672c\u5e73\u9762\u7684 Unicode\u5b57\u7b26\uff0c\u90fd\u65e0\u6cd5\u4f7f\u7528 Mysql \u7684 utf8 \u5b57\u7b26\u96c6\u5b58\u50a8\u3002\u5305\u62ec Emoji \u8868\u60c5(Emoji \u662f\u4e00\u79cd\u7279\u6b8a\u7684 Unicode \u7f16\u7801\uff0c\u5e38\u89c1\u4e8e ios \u548c android \u624b\u673a\u4e0a)\uff0c\u548c\u5f88\u591a\u4e0d\u5e38\u7528\u7684\u6c49\u5b57\uff0c\u4ee5\u53ca\u4efb\u4f55\u65b0\u589e\u7684 Unicode \u5b57\u7b26\u7b49\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u603b\u7ed3\uff1aMySQL\u7684utf8\u662futfmb3\uff0c\u53ea\u6709\u4e09\u4e2a\u5b57\u8282\uff0c\u8282\u7701\u7a7a\u95f4\u4f46\u4e0d\u80fd\u8868\u8fbe\u5168\u90e8\u7684UTF-8\u3002\u6240\u4ee5\u63a8\u8350\u4f7f\u7528utf8mb4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">utf8mb4_bin\uff1a\u5c06\u5b57\u7b26\u4e32\u6bcf\u4e2a\u5b57\u7b26\u7528\u4e8c\u8fdb\u5236\u6570\u636e\u7f16\u8bd1\u5b58\u50a8\uff0c\u533a\u5206\u5927\u5c0f\u5199\uff0c\u800c\u4e14\u53ef\u4ee5\u5b58\u4e8c\u8fdb\u5236\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">utf8mb4_general_ci\uff1aci\u5373case insensitive\uff0c\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002\u6ca1\u6709\u5b9e\u73b0Unicode\u6392\u5e8f\u89c4\u5219\uff0c\u5728\u9047\u5230\u67d0\u4e9b\u7279\u6b8a\u8bed\u8a00\u6216\u8005\u5b57\u7b26\u96c6\uff0c\u6392\u5e8f\u7ed3\u679c\u53ef\u80fd\u4e0d\u4e00\u81f4\u3002\u4f46\u662f\uff0c\u5728\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e9b\u7279\u6b8a\u5b57\u7b26\u7684\u987a\u5e8f\u5e76\u4e0d\u9700\u8981\u90a3\u4e48\u7cbe\u786e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">utf8mb4_unicode_ci\uff1a\u662f\u57fa\u4e8e\u6807\u51c6\u7684Unicode\u6765\u6392\u5e8f\u548c\u6bd4\u8f83\uff0c\u80fd\u591f\u5728\u5404\u79cd\u8bed\u8a00\u4e4b\u95f4\u7cbe\u786e\u6392\u5e8f\uff0cUnicode\u6392\u5e8f\u89c4\u5219\u4e3a\u4e86\u80fd\u591f\u5904\u7406\u7279\u6b8a\u5b57\u7b26\u7684\u60c5\u51b5\uff0c\u5b9e\u73b0\u4e86\u7565\u5fae\u590d\u6742\u7684\u6392\u5e8f\u7b97\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">utf8mb4_general_ci\u662f\u4e00\u4e2a\u9057\u7559\u7684 \u6821\u5bf9\u89c4\u5219\uff0c\u4e0d\u652f\u6301\u6269\u5c55\uff0c\u5b83\u4ec5\u80fd\u591f\u5728\u5b57\u7b26\u4e4b\u95f4\u8fdb\u884c\u9010\u4e2a\u6bd4\u8f83\u3002utf8_general_ci\u6821\u5bf9\u89c4\u5219\u8fdb\u884c\u7684\u6bd4\u8f83\u901f\u5ea6\u5f88\u5feb\uff0c\u4f46\u662f\u4e0e\u4f7f\u7528 utf8mb4_unicode_ci\u7684\u6821\u5bf9\u89c4\u5219\u76f8\u6bd4\uff0c\u6bd4\u8f83\u6b63\u786e\u6027\u8f83\u5dee\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">\u603b\u7ed3\uff1ageneral_ci \u66f4\u5feb\uff0cunicode_ci \u66f4\u51c6\u786e\u3002\u4f46\u76f8\u6bd4\u73b0\u5728\u7684CPU\u6765\u8bf4\uff0c\u5b83\u8fdc\u8fdc\u4e0d\u8db3\u4ee5\u6210\u4e3a\u8003\u8651\u6027\u80fd\u7684\u56e0\u7d20\uff0c\u7d22\u5f15\u6d89\u53ca\u3001SQL\u8bbe\u8ba1\u624d\u662f\u3002\u4f7f\u7528\u8005\u66f4\u5e94\u8be5\u5173\u5fc3\u5b57\u7b26\u96c6\u4e0e\u6392\u5e8f\u89c4\u5219\u5728db\u91cc\u9700\u8981\u7edf\u4e00\u3002<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">\u7248\u6743\u58f0\u660e\uff1a\u672c\u6587\u4e3aCSDN\u535a\u4e3b\u300cyzh_1346983557\u300d\u7684\u539f\u521b\u6587\u7ae0\uff0c\u9075\u5faaCC 4.0 by-sa\u7248\u6743\u534f\u8bae\uff0c\u8f6c\u8f7d\u8bf7\u9644\u4e0a\u539f\u6587\u51fa\u5904\u94fe\u63a5\u53ca\u672c\u58f0\u660e\u3002<br>\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/blog.csdn.net\/yzh_1346983557\/article\/details\/89643071<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">===================================================================<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.utf8\u4e0eutf8mb4\uff08utf8 most bytes 4\uff09 MySQL  &hellip; <a href=\"https:\/\/www.xiaobo.li\/notes\/archives\/1733\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[288],"tags":[],"class_list":["post-1733","post","type-post","status-publish","format-standard","hentry","category-db"],"_links":{"self":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/1733","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/comments?post=1733"}],"version-history":[{"count":0,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/1733\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/media?parent=1733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/categories?post=1733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/tags?post=1733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}