{"id":179638,"date":"2024-11-09T03:33:20","date_gmt":"2024-11-08T19:33:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179638\/"},"modified":"2024-11-09T03:33:21","modified_gmt":"2024-11-08T19:33:21","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-mysql-%e4%b8%ad%e5%bb%ba%e7%ab%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%ef%bc%9f-mysql-%e5%bb%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179638\/","title":{"rendered":"\u5982\u4f55\u5728 MySQL \u4e2d\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\uff1f (mysql \u5efa\u6578\u64da\u5eab\u5b57\u6bb5)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-mysql-%e4%b8%ad%e5%bb%ba%e7%ab%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%ef%bc%9f-fpsOjZbFrN\">\u5982\u4f55\u5728 MySQL \u4e2d\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\u662f\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\u7684\u91cd\u8981\u6b65\u9a5f\uff0c\u9019\u4e9b\u5b57\u6bb5\u5c07\u7528\u65bc\u5b58\u5132\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728 MySQL \u4e2d\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%ef%bc%9f-fpsOjZbFrN\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u5b57\u6bb5\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u5b57\u6bb5\u662f\u6578\u64da\u8868\u4e2d\u7684\u4e00\u500b\u5217\uff0c\u7528\u65bc\u5b58\u5132\u7279\u5b9a\u985e\u578b\u7684\u6578\u64da\u3002\u6bcf\u500b\u5b57\u6bb5\u90fd\u6709\u4e00\u500b\u540d\u7a31\u548c\u6578\u64da\u985e\u578b\uff0c\u9019\u4e9b\u5b57\u6bb5\u5171\u540c\u69cb\u6210\u4e86\u6578\u64da\u8868\u7684\u7d50\u69cb\u3002\u8209\u4f8b\u4f86\u8aaa\uff0c\u5728\u4e00\u500b\u7528\u6236\u4fe1\u606f\u8868\u4e2d\uff0c\u53ef\u80fd\u6703\u6709\u5b57\u6bb5\u5982\u7528\u6236\u540d\u3001\u96fb\u5b50\u90f5\u4ef6\u548c\u8a3b\u518a\u65e5\u671f\u7b49\u3002<\/p>\n<h2 id=\"%e5%bb%ba%e7%ab%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%ad%a5%e9%a9%9f-fpsOjZbFrN\">\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\u7684\u57fa\u672c\u6b65\u9a5f<\/h2>\n<p>\u5728 MySQL \u4e2d\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\u7684\u904e\u7a0b\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u5275\u5efa\u6578\u64da\u5eab<\/li>\n<li>\u5275\u5efa\u6578\u64da\u8868<\/li>\n<li>\u5b9a\u7fa9\u5b57\u6bb5\u53ca\u5176\u5c6c\u6027<\/li>\n<\/ol>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e5%ba%ab-fpsOjZbFrN\">1. \u5275\u5efa\u6578\u64da\u5eab<\/h3>\n<p>\u9996\u5148\uff0c\u60a8\u9700\u8981\u5275\u5efa\u4e00\u500b\u6578\u64da\u5eab\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u5275\u5efa\u6578\u64da\u5eab\uff1a<\/p>\n<pre><code>CREATE DATABASE my_database;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5275\u5efa\u4e00\u500b\u540d\u70ba <code>my_database<\/code> \u7684\u6578\u64da\u5eab\u3002<\/p>\n<h3 id=\"2-%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e8%a1%a8-fpsOjZbFrN\">2. \u5275\u5efa\u6578\u64da\u8868<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u60a8\u9700\u8981\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u4e00\u500b\u6578\u64da\u8868\u3002\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u5275\u5efa\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u6578\u64da\u8868\uff1a<\/p>\n<pre><code>USE my_database;\n\nCREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(100) NOT NULL,\n    registration_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u5305\u542b\u56db\u500b\u5b57\u6bb5\u7684 <code>users<\/code> \u8868\uff1a<\/p>\n<ul>\n<li><code>id<\/code>\uff1a\u6574\u6578\u985e\u578b\uff0c\u81ea\u52d5\u589e\u91cf\uff0c\u4f5c\u70ba\u4e3b\u9375\u3002<\/li>\n<li><code>username<\/code>\uff1a\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u6700\u5927\u9577\u5ea6\u70ba 50\uff0c\u4e0d\u80fd\u70ba\u7a7a\u3002<\/li>\n<li><code>email<\/code>\uff1a\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u6700\u5927\u9577\u5ea6\u70ba 100\uff0c\u4e0d\u80fd\u70ba\u7a7a\u3002<\/li>\n<li><code>registration_date<\/code>\uff1a\u6642\u9593\u6233\u985e\u578b\uff0c\u9ed8\u8a8d\u70ba\u7576\u524d\u6642\u9593\u3002<\/li>\n<\/ul>\n<h3 id=\"3-%e5%ae%9a%e7%be%a9%e5%ad%97%e6%ae%b5%e5%8f%8a%e5%85%b6%e5%b1%ac%e6%80%a7-fpsOjZbFrN\">3. \u5b9a\u7fa9\u5b57\u6bb5\u53ca\u5176\u5c6c\u6027<\/h3>\n<p>\u5728\u5275\u5efa\u6578\u64da\u8868\u6642\uff0c\u60a8\u53ef\u4ee5\u70ba\u6bcf\u500b\u5b57\u6bb5\u5b9a\u7fa9\u4e0d\u540c\u7684\u5c6c\u6027\uff0c\u5305\u62ec\u6578\u64da\u985e\u578b\u3001\u9577\u5ea6\u3001\u662f\u5426\u5141\u8a31\u7a7a\u503c\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u985e\u578b\uff1a<\/p>\n<ul>\n<li><code>INT<\/code>\uff1a\u6574\u6578\u985e\u578b\u3002<\/li>\n<li><code>VARCHAR(n)<\/code>\uff1a\u53ef\u8b8a\u9577\u5ea6\u5b57\u7b26\u4e32\uff0c<code>n<\/code> \u662f\u6700\u5927\u9577\u5ea6\u3002<\/li>\n<li><code>TEXT<\/code>\uff1a\u9577\u6587\u672c\u5b57\u7b26\u4e32\u3002<\/li>\n<li><code>DATE<\/code>\uff1a\u65e5\u671f\u985e\u578b\u3002<\/li>\n<li><code>TIMESTAMP<\/code>\uff1a\u6642\u9593\u6233\u985e\u578b\u3002<\/li>\n<\/ul>\n<p>\u60a8\u9084\u53ef\u4ee5\u4f7f\u7528\u7d04\u675f\u4f86\u9650\u5236\u5b57\u6bb5\u7684\u503c\uff0c\u4f8b\u5982 <code>NOT NULL<\/code>\u3001<code>UNIQUE<\/code> \u548c <code>DEFAULT<\/code> \u7b49\u3002<\/p>\n<h2 id=\"%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5-fpsOjZbFrN\">\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5<\/h2>\n<p>\u5982\u679c\u60a8\u9700\u8981\u4fee\u6539\u5df2\u5b58\u5728\u7684\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5c07 <code>username<\/code> \u5b57\u6bb5\u7684\u9577\u5ea6\u5f9e 50 \u589e\u52a0\u5230 100\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users MODIFY username VARCHAR(100);<\/code><\/pre>\n<h2 id=\"%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5-fpsOjZbFrN\">\u522a\u9664\u6578\u64da\u5eab\u5b57\u6bb5<\/h2>\n<p>\u82e5\u8981\u522a\u9664\u67d0\u500b\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664 <code>email<\/code> \u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users DROP COLUMN email;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fpsOjZbFrN\">\u7e3d\u7d50<\/h2>\n<p>\u5728 MySQL \u4e2d\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\u662f\u4e00\u500b\u57fa\u672c\u800c\u91cd\u8981\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u5230\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u548c\u6578\u64da\u7684\u5b58\u5132\u3002\u901a\u904e\u5275\u5efa\u6578\u64da\u5eab\u3001\u6578\u64da\u8868\u4ee5\u53ca\u5b9a\u7fa9\u5b57\u6bb5\u53ca\u5176\u5c6c\u6027\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u3002\u7121\u8ad6\u662f\u5275\u5efa\u65b0\u5b57\u6bb5\u3001\u4fee\u6539\u73fe\u6709\u5b57\u6bb5\u9084\u662f\u522a\u9664\u4e0d\u9700\u8981\u7684\u5b57\u6bb5\uff0cMySQL \u90fd\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684 SQL \u8a9e\u53e5\u4f86\u652f\u6301\u9019\u4e9b\u64cd\u4f5c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684 MySQL \u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u9805\u76ee\u9084\u662f\u5927\u578b\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728 MySQL \u4e2d\u5efa\u7acb\u6578\u64da\u5eab\u5b57\u6bb5\uff0c\u638c\u63e1\u57fa\u672c\u8a9e\u6cd5\u548c\u6b65\u9a5f\uff0c\u8f15\u9b06\u8a2d\u8a08\u6578\u64da\u7d50\u69cb\u4ee5\u6eff\u8db3\u9700\u6c42\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-179638","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179638","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=179638"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179638\/revisions"}],"predecessor-version":[{"id":179639,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179638\/revisions\/179639"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179638"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179638"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}