{"id":75800,"date":"2024-10-16T01:20:16","date_gmt":"2024-10-15T17:20:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75800\/"},"modified":"2024-10-16T01:20:16","modified_gmt":"2024-10-15T17:20:16","slug":"mysql-%e6%9f%a5%e8%a9%a2%e5%a4%a7%e5%b0%8f%e5%af%ab%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75800\/","title":{"rendered":"MySQL \u67e5\u8a62\u5927\u5c0f\u5beb\u554f\u984c"},"content":{"rendered":"<h1 id=\"mysql-%e6%9f%a5%e8%a9%a2%e5%a4%a7%e5%b0%8f%e5%af%ab%e5%95%8f%e9%a1%8c-dMazJuddxv\">MySQL \u67e5\u8a62\u5927\u5c0f\u5beb\u554f\u984c<\/h1>\n<p>\u5728\u4f7f\u7528 MySQL \u6578\u64da\u5eab\u6642\uff0c\u5927\u5c0f\u5beb\u554f\u984c\u5e38\u5e38\u6210\u70ba\u958b\u767c\u8005\u9762\u81e8\u7684\u4e00\u500b\u6311\u6230\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e MySQL \u4e2d\u7684\u5927\u5c0f\u5beb\u654f\u611f\u6027\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u89e3\u6c7a\u65b9\u6848\u548c\u6700\u4f73\u5be6\u8e10\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7ba1\u7406\u6578\u64da\u5eab\u67e5\u8a62\u3002<\/p>\n<h2 id=\"mysql-%e7%9a%84%e5%a4%a7%e5%b0%8f%e5%af%ab%e6%95%8f%e6%84%9f%e6%80%a7-dMazJuddxv\">MySQL \u7684\u5927\u5c0f\u5beb\u654f\u611f\u6027<\/h2>\n<p>MySQL \u7684\u5927\u5c0f\u5beb\u654f\u611f\u6027\u4e3b\u8981\u53d6\u6c7a\u65bc\u6578\u64da\u5eab\u7684\u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u898f\u5247\uff08collation\uff09\u3002\u5728 MySQL \u4e2d\uff0c\u5b57\u7b26\u96c6\u5b9a\u7fa9\u4e86\u53ef\u4ee5\u5b58\u5132\u7684\u5b57\u7b26\uff0c\u800c\u6392\u5e8f\u898f\u5247\u5247\u6c7a\u5b9a\u4e86\u5b57\u7b26\u7684\u6bd4\u8f03\u65b9\u5f0f\u3002\u4e0d\u540c\u7684\u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u898f\u5247\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u5b57\u7b26\u4e32\u6bd4\u8f03\u6642\u3002<\/p>\n<h3 id=\"%e5%ad%97%e7%ac%a6%e9%9b%86%e8%88%87%e6%8e%92%e5%ba%8f%e8%a6%8f%e5%89%87-dMazJuddxv\">\u5b57\u7b26\u96c6\u8207\u6392\u5e8f\u898f\u5247<\/h3>\n<p>MySQL \u652f\u6301\u591a\u7a2e\u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u898f\u5247\u3002\u6700\u5e38\u7528\u7684\u5b57\u7b26\u96c6\u662f <code>utf8mb4<\/code>\uff0c\u800c\u5e38\u898b\u7684\u6392\u5e8f\u898f\u5247\u5305\u62ec <code>utf8mb4_general_ci<\/code> \u548c <code>utf8mb4_bin<\/code>\u3002\u5176\u4e2d\uff0c<code>_ci<\/code> \u8868\u793a\u4e0d\u5340\u5206\u5927\u5c0f\u5beb\uff08case-insensitive\uff09\uff0c\u800c <code>_bin<\/code> \u5247\u8868\u793a\u5340\u5206\u5927\u5c0f\u5beb\uff08case-sensitive\uff09\u3002<\/p>\n<ul>\n<li><strong>utf8mb4_general_ci<\/strong>: \u4e0d\u5340\u5206\u5927\u5c0f\u5beb\uff0c\u67e5\u8a62\u6642\u6703\u5ffd\u7565\u5b57\u6bcd\u7684\u5927\u5c0f\u5beb\u3002<\/li>\n<li><strong>utf8mb4_bin<\/strong>: \u5340\u5206\u5927\u5c0f\u5beb\uff0c\u67e5\u8a62\u6642\u6703\u8003\u616e\u5b57\u6bcd\u7684\u5927\u5c0f\u5beb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e7%a4%ba%e4%be%8b-dMazJuddxv\">\u67e5\u8a62\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u67e5\u8a62\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5927\u5c0f\u5beb\u654f\u611f\u6027\u5982\u4f55\u5f71\u97ff\u67e5\u8a62\u7d50\u679c\uff1a<\/p>\n<pre><code>-- \u4f7f\u7528\u4e0d\u5340\u5206\u5927\u5c0f\u5beb\u7684\u6392\u5e8f\u898f\u5247\nSELECT * FROM users WHERE username = 'Alice';\n\n-- \u4f7f\u7528\u5340\u5206\u5927\u5c0f\u5beb\u7684\u6392\u5e8f\u898f\u5247\nSELECT * FROM users WHERE BINARY username = 'Alice';<\/code><\/pre>\n<p>\u5728\u7b2c\u4e00\u500b\u67e5\u8a62\u4e2d\uff0c\u7121\u8ad6\u7528\u6236\u540d\u662f &#8216;alice&#8217;\u3001&#8217;ALICE&#8217; \u9084\u662f &#8216;Alice&#8217;\uff0c\u90fd\u6703\u8fd4\u56de\u76f8\u540c\u7684\u7d50\u679c\u3002\u800c\u5728\u7b2c\u4e8c\u500b\u67e5\u8a62\u4e2d\uff0c\u53ea\u6709\u7528\u6236\u540d\u5b8c\u5168\u5339\u914d &#8216;Alice&#8217; \u7684\u8a18\u9304\u624d\u6703\u88ab\u8fd4\u56de\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%ba%e5%a4%a7%e5%b0%8f%e5%af%ab%e5%95%8f%e9%a1%8c-dMazJuddxv\">\u5982\u4f55\u89e3\u6c7a\u5927\u5c0f\u5beb\u554f\u984c<\/h2>\n<p>\u70ba\u4e86\u907f\u514d\u56e0\u5927\u5c0f\u5beb\u554f\u984c\u800c\u5c0e\u81f4\u7684\u67e5\u8a62\u932f\u8aa4\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<ul>\n<li><strong>\u7d71\u4e00\u6578\u64da\u683c\u5f0f<\/strong>: \u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u7d71\u4e00\u4f7f\u7528\u5c0f\u5beb\u6216\u5927\u5beb\u5b57\u6bcd\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u67e5\u8a62\u6642\u7684\u5927\u5c0f\u5beb\u554f\u984c\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e0d\u5340\u5206\u5927\u5c0f\u5beb\u7684\u6392\u5e8f\u898f\u5247<\/strong>: \u5728\u5275\u5efa\u6578\u64da\u8868\u6642\uff0c\u9078\u64c7\u4e0d\u5340\u5206\u5927\u5c0f\u5beb\u7684\u6392\u5e8f\u898f\u5247\uff0c\u4f8b\u5982 <code>utf8mb4_general_ci<\/code>\u3002<\/li>\n<li><strong>\u4f7f\u7528\u51fd\u6578\u9032\u884c\u6bd4\u8f03<\/strong>: \u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 <code>LOWER()<\/code> \u6216 <code>UPPER()<\/code> \u51fd\u6578\u4f86\u9032\u884c\u5927\u5c0f\u5beb\u4e0d\u654f\u611f\u7684\u6bd4\u8f03\u3002<\/code><\/li>\n<\/ul>\n<pre><code>-- \u4f7f\u7528 LOWER() \u51fd\u6578\u9032\u884c\u4e0d\u5340\u5206\u5927\u5c0f\u5beb\u7684\u6bd4\u8f03\nSELECT * FROM users WHERE LOWER(username) = LOWER('Alice');<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-dMazJuddxv\">\u7d50\u8ad6<\/h2>\n<p>MySQL \u7684\u5927\u5c0f\u5beb\u554f\u984c\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u662f\u4e00\u500b\u5e38\u898b\u7684\u6311\u6230\u3002\u4e86\u89e3\u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u898f\u5247\u7684\u5f71\u97ff\uff0c\u4e26\u63a1\u53d6\u9069\u7576\u7684\u63aa\u65bd\u4f86\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u63d0\u9ad8\u67e5\u8a62\u7684\u6e96\u78ba\u6027\u548c\u6548\u7387\u3002\u7121\u8ad6\u662f\u9078\u64c7\u5408\u9069\u7684\u6392\u5e8f\u898f\u5247\uff0c\u9084\u662f\u7d71\u4e00\u6578\u64da\u683c\u5f0f\uff0c\u9019\u4e9b\u90fd\u662f\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u670d\u52a1\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 MySQL \u4e2d\u7684\u5927\u5c0f\u5beb\u67e5\u8a62\u554f\u984c\uff0c\u638c\u63e1\u5982\u4f55\u6b63\u78ba\u8655\u7406\u5b57\u6bcd\u5927\u5c0f\u5beb\u4ee5\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6e96\u78ba\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-75800","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75800","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=75800"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75800\/revisions"}],"predecessor-version":[{"id":75801,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75800\/revisions\/75801"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}