{"id":200006,"date":"2025-05-06T09:23:35","date_gmt":"2025-05-06T01:23:35","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200006\/"},"modified":"2025-05-06T09:23:35","modified_gmt":"2025-05-06T01:23:35","slug":"%e6%b7%b1%e5%85%a5%e6%8e%a2%e8%ae%a8mysql%e5%89%8d%e7%bc%80%e7%b4%a2%e5%bc%95%e7%9a%84%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200006\/","title":{"rendered":"\u6df1\u5165\u63a2\u8ba8MySQL\u524d\u7f00\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406"},"content":{"rendered":"

<\/b> <\/p>\n

\u6df1\u5165\u63a2\u8ba8MySQL\u524d\u7f00\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u6df1\u5165\u63a2\u8ba8MySQL\u524d\u7f00\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n

MySQL\u4e2d\u524d\u7f00\u7d22\u5f15\u7684\u539f\u7406\u89e3\u6790\u4e0e\u4ee3\u7801\u793a\u4f8b<\/p>\n

\u524d\u7f00\u7d22\u5f15\u662fMySQL\u6570\u636e\u5e93\u4e2d\u4e00\u79cd\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u7684\u6280\u672f\uff0c\u901a\u8fc7\u53ea\u5bf9\u5b57\u6bb5\u503c\u7684\u4e00\u90e8\u5206\u8fdb\u884c\u7d22\u5f15\u6765\u51cf\u5c0f\u7d22\u5f15\u7684\u5927\u5c0f\uff0c\u4ece\u800c\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u89e3\u6790\u524d\u7f00\u7d22\u5f15\u7684\u539f\u7406\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u3002<\/p>\n

\u524d\u7f00\u7d22\u5f15\u539f\u7406\u89e3\u6790<\/h3>\n

\u5728MySQL\u4e2d\uff0c\u666e\u901a\u7d22\u5f15\u662f\u5bf9\u6574\u4e2a\u5b57\u6bb5\u503c\u8fdb\u884c\u6392\u5e8f\u548c\u5b58\u50a8\u7684\u3002\u4f46\u5f53\u5b57\u6bb5\u503c\u5f88\u957f\u65f6\uff0c\u5982VARCHAR(255)\u7c7b\u578b\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u7d22\u5f15\u7684\u5927\u5c0f\u53d8\u5f97\u5f88\u5927\uff0c\u4ece\u800c\u964d\u4f4e\u7d22\u5f15\u7684\u6548\u7387\u3002\u800c\u524d\u7f00\u7d22\u5f15\u5219\u53ef\u4ee5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5b83\u53ea\u5bf9\u5b57\u6bb5\u503c\u7684\u7279\u5b9a\u957f\u5ea6\u8fdb\u884c\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u6574\u4e2a\u5b57\u6bb5\u503c\u3002<\/p>\n

\u5f53\u521b\u5efa\u4e00\u4e2a\u524d\u7f00\u7d22\u5f15\u65f6\uff0cMySQL\u4f1a\u53ea\u5b58\u50a8\u5b57\u6bb5\u503c\u7684\u6307\u5b9a\u957f\u5ea6\u7684\u90e8\u5206\uff0c\u800c\u4e0d\u662f\u5168\u90e8\u5b58\u50a8\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u51cf\u5c0f\u7d22\u5f15\u7684\u5927\u5c0f\uff0c\u8fdb\u800c\u63d0\u9ad8\u67e5\u8be2\u7684\u6548\u7387\u3002\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u67e5\u8be2\u7ed3\u679c\u4e0d\u51c6\u786e\uff0c\u56e0\u4e3a\u53ea\u7d22\u5f15\u4e86\u5b57\u6bb5\u503c\u7684\u90e8\u5206\u5185\u5bb9\u3002<\/p>\n

\u521b\u5efa\u524d\u7f00\u7d22\u5f15\u7684\u793a\u4f8b<\/h3>\n

\u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3ausers<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u6709\u4e00\u4e2ausername<\/code>\u5b57\u6bb5\u9700\u8981\u521b\u5efa\u524d\u7f00\u7d22\u5f15\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u7684SQL\u4ee3\u7801\uff0c\u5c55\u793a\u5982\u4f55\u521b\u5efa\u524d\u7f00\u7d22\u5f15\uff1a<\/p>\n

ALTER TABLE users ADD INDEX idx_username(username(10));<\/pre>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cidx_username<\/code>\u662f\u7d22\u5f15\u7684\u540d\u79f0\uff0cusername<\/code>\u662f\u8981\u521b\u5efa\u7d22\u5f15\u7684\u5b57\u6bb5\u540d\uff0c(10)<\/code>\u8868\u793a\u53ea\u5bf9\u5b57\u6bb5\u503c\u7684\u524d10\u4e2a\u5b57\u7b26\u8fdb\u884c\u7d22\u5f15\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u521b\u5efa\u524d\u7f00\u7d22\u5f15\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u51cf\u5c0f\u7d22\u5f15\u7684\u5927\u5c0f\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/p>\n
\u67e5\u8be2\u65f6\u5982\u4f55\u4f7f\u7528\u524d\u7f00\u7d22\u5f15<\/h3>\n
\u5728\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\u65f6\uff0c\u9700\u8981\u4fdd\u8bc1\u67e5\u8be2\u6761\u4ef6\u4e5f\u4f7f\u7528\u4e86\u76f8\u540c\u957f\u5ea6\u7684\u524d\u7f00\u3002\u5426\u5219\uff0cMySQL\u65e0\u6cd5\u6709\u6548\u5229\u7528\u7d22\u5f15\uff0c\u4ece\u800c\u5bfc\u81f4\u67e5\u8be2\u6548\u7387\u4e0b\u964d\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u7684SQL\u4ee3\u7801\uff0c\u5c55\u793a\u5982\u4f55\u5728\u67e5\u8be2\u65f6\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\uff1a<\/p>\n
SELECT * FROM users WHERE username LIKE 'john%';<\/pre>\n
\u5728\u4e0a\u9762\u7684\u67e5\u8be2\u4e2d\uff0cusername<\/code>\u5b57\u6bb5\u7684\u524d\u7f00\u7d22\u5f15\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u56e0\u4e3a\u67e5\u8be2\u6761\u4ef6\u4e5f\u662f\u4ee5\u76f8\u540c\u957f\u5ea6\u7684\u524d\u7f00\u5f00\u59cb\u7684\u3002<\/p>\n
\u603b\u7ed3<\/h3>\n
\u901a\u8fc7\u672c\u6587\u7684\u4ecb\u7ecd\uff0c\u8bfb\u8005\u5e94\u8be5\u5bf9MySQL\u4e2d\u524d\u7f00\u7d22\u5f15\u7684\u539f\u7406\u6709\u4e86\u66f4\u6df1\u5165\u7684\u4e86\u89e3\u3002\u524d\u7f00\u7d22\u5f15\u662f\u4e00\u79cd\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u7684\u6280\u672f\uff0c\u53ef\u4ee5\u5e2e\u52a9\u51cf\u5c0f\u7d22\u5f15\u7684\u5927\u5c0f\uff0c\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002\u4f46\u5728\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u65f6\u9700\u8981\u6ce8\u610f\u67e5\u8be2\u6761\u4ef6\u7684\u5339\u914d\u957f\u5ea6\uff0c\u907f\u514d\u5f71\u54cd\u67e5\u8be2\u7ed3\u679c\u7684\u51c6\u786e\u6027\u3002\u5e0c\u671b\u8bfb\u8005\u901a\u8fc7\u672c\u6587\u7684\u5185\u5bb9\u80fd\u66f4\u597d\u5730\u4e86\u89e3\u548c\u5e94\u7528\u524d\u7f00\u7d22\u5f15\u6280\u672f\u3002<\/p>\n
\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u6df1\u5165\u63a2\u8ba8MySQL\u524d\u7f00\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8emysql,\u539f\u7406,\u524d\u7f00\u7d22\u5f15\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u6df1\u5165\u63a2\u8ba8MySQL\u524d\u7f00\u7d22\u5f15\u7684\u5de5\u4f5c...<\/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-200006","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200006","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=200006"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200006\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200006"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}