{"id":79126,"date":"2024-10-16T12:45:16","date_gmt":"2024-10-16T04:45:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79126\/"},"modified":"2024-10-16T12:45:16","modified_gmt":"2024-10-16T04:45:16","slug":"mysql%e6%8c%87%e4%bb%a4-mediumint%ef%bc%88%e4%b8%ad%e6%95%b4%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79126\/","title":{"rendered":"MySQL\u6307\u4ee4: MEDIUMINT\uff08\u4e2d\u6574\u6578\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-mediumint%ef%bc%88%e4%b8%ad%e6%95%b4%e6%95%b8%ef%bc%89-DlKuHkuOtR\">MySQL\u6307\u4ee4: MEDIUMINT\uff08\u4e2d\u6574\u6578\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u5c0d\u65bc\u6578\u64da\u7684\u5b58\u5132\u548c\u8655\u7406\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\u4ee5\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u5176\u4e2d\uff0c<code>MEDIUMINT<\/code>\uff08\u4e2d\u6574\u6578\uff09\u662f\u4e00\u7a2e\u5e38\u7528\u7684\u6574\u6578\u6578\u64da\u985e\u578b\uff0c\u9069\u5408\u7528\u65bc\u9700\u8981\u5b58\u5132\u4e2d\u7b49\u7bc4\u570d\u6574\u6578\u7684\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"mediumint%e7%9a%84%e5%ae%9a%e7%be%a9%e8%88%87%e7%af%84%e5%9c%8d-DlKuHkuOtR\">MEDIUMINT\u7684\u5b9a\u7fa9\u8207\u7bc4\u570d<\/h2>\n<p><code>MEDIUMINT<\/code>\u662f\u4e00\u7a2e\u6574\u6578\u6578\u64da\u985e\u578b\uff0c\u4f54\u75283\u500b\u5b57\u7bc0\u7684\u5b58\u5132\u7a7a\u9593\u3002\u5b83\u7684\u53d6\u503c\u7bc4\u570d\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u6709\u7b26\u865f\uff08signed\uff09\uff1a-8,388,608 \u5230 8,388,607<\/li>\n<li>\u7121\u7b26\u865f\uff08unsigned\uff09\uff1a0 \u5230 16,777,215<\/li>\n<\/ul>\n<p>\u9019\u610f\u5473\u8457\uff0c<code>MEDIUMINT<\/code>\u53ef\u4ee5\u5b58\u5132\u7684\u6574\u6578\u7bc4\u570d\u6bd4<code>SMALLINT<\/code>\uff08\u4f54\u75282\u500b\u5b57\u7bc0\uff09\u66f4\u5927\uff0c\u4f46\u53c8\u5c0f\u65bc<code>INT<\/code>\uff08\u4f54\u75284\u500b\u5b57\u7bc0\uff09\u3002\u56e0\u6b64\uff0c\u7576\u4f60\u9700\u8981\u5b58\u5132\u7684\u6574\u6578\u7bc4\u570d\u5728\u9019\u500b\u7bc4\u570d\u5167\u6642\uff0c\u4f7f\u7528<code>MEDIUMINT<\/code>\u53ef\u4ee5\u6709\u6548\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8mediumint%e7%9a%84%e5%a0%b4%e6%99%af-DlKuHkuOtR\">\u4f7f\u7528MEDIUMINT\u7684\u5834\u666f<\/h2>\n<p>\u5728\u8a31\u591a\u61c9\u7528\u4e2d\uff0c<code>MEDIUMINT<\/code>\u662f\u4e00\u500b\u7406\u60f3\u7684\u9078\u64c7\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u7528\u65bc\u5b58\u5132\u7528\u6236ID\u6216\u7522\u54c1ID\uff0c\u7576\u9019\u4e9bID\u7684\u6578\u91cf\u4e0d\u6703\u8d85\u904e8\u767e\u842c\u6642\u3002<\/li>\n<li>\u5728\u7d71\u8a08\u6578\u64da\u4e2d\uff0c\u7576\u9700\u8981\u5b58\u5132\u7684\u8a08\u6578\u503c\u4e0d\u6703\u8d85\u904e8\u767e\u842c\u6642\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u904a\u6232\u61c9\u7528\u4e2d\uff0c\u7576\u9700\u8981\u5b58\u5132\u73a9\u5bb6\u7684\u5206\u6578\u6216\u7b49\u7d1a\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8mediumint-DlKuHkuOtR\">\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528MEDIUMINT<\/h2>\n<p>\u5728MySQL\u4e2d\u5275\u5efa\u4e00\u500b\u5305\u542b<code>MEDIUMINT<\/code>\u985e\u578b\u7684\u8868\u683c\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id MEDIUMINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    score MEDIUMINT DEFAULT 0\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba<code>users<\/code>\u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b<code>MEDIUMINT<\/code>\u985e\u578b\u7684<code>id<\/code>\u6b04\u4f4d\uff0c\u4e26\u8a2d\u7f6e\u70ba\u81ea\u52d5\u589e\u91cf\u3002\u9019\u6a23\uff0c\u6bcf\u7576\u63d2\u5165\u65b0\u7528\u6236\u6642\uff0c<code>id<\/code>\u5c07\u81ea\u52d5\u589e\u52a0\uff0c\u4e26\u4e14\u4e0d\u6703\u8d85\u904e\u7121\u7b26\u865f\u7684\u7bc4\u570d\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e8%88%87%e6%93%8d%e4%bd%9cmediumint%e6%95%b8%e6%93%9a-DlKuHkuOtR\">\u67e5\u8a62\u8207\u64cd\u4f5cMEDIUMINT\u6578\u64da<\/h2>\n<p>\u4e00\u65e6\u8868\u683c\u5275\u5efa\u5b8c\u6210\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u6a19\u6e96\u7684SQL\u8a9e\u53e5\u4f86\u63d2\u5165\u548c\u67e5\u8a62\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>INSERT INTO users (username, score) VALUES ('Alice', 1500);\nINSERT INTO users (username, score) VALUES ('Bob', 3000);\n\nSELECT * FROM users WHERE score &gt; 2000;<\/code><\/pre>\n<p>\u9019\u4e9b\u8a9e\u53e5\u5c07\u63d2\u5165\u5169\u500b\u7528\u6236\u4e26\u67e5\u8a62\u5206\u6578\u5927\u65bc2000\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-DlKuHkuOtR\">\u7e3d\u7d50<\/h2>\n<p>\u7e3d\u7684\u4f86\u8aaa\uff0c<code>MEDIUMINT<\/code>\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u6574\u6578\u6578\u64da\u985e\u578b\uff0c\u9069\u5408\u7528\u65bc\u9700\u8981\u5b58\u5132\u4e2d\u7b49\u7bc4\u570d\u6574\u6578\u7684\u5834\u666f\u3002\u5b83\u7684\u5b58\u5132\u6548\u7387\u548c\u7bc4\u570d\u4f7f\u5176\u6210\u70ba\u8a31\u591a\u61c9\u7528\u7684\u7406\u60f3\u9078\u64c7\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u5b58\u5132\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684MySQL\u8cc7\u6599\u5eab\uff0c\u4eab\u53d7\u7a69\u5b9a\u548c\u5feb\u901f\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684MEDIUMINT\u6570\u636e\u7c7b\u578b\uff0c\u9002\u7528\u4e8e\u5b58\u50a8\u4e2d\u7b49\u8303\u56f4\u7684\u6574\u6570\uff0c\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\u5e76\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\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-79126","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79126","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=79126"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79126\/revisions"}],"predecessor-version":[{"id":79127,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79126\/revisions\/79127"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}