{"id":75768,"date":"2024-10-16T01:03:16","date_gmt":"2024-10-15T17:03:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75768\/"},"modified":"2024-10-16T01:03:16","modified_gmt":"2024-10-15T17:03:16","slug":"mysql-%e8%a1%a8%e7%ae%a1%e7%90%86%e5%91%bd%e4%bb%a4%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75768\/","title":{"rendered":"MySQL \u8868\u7ba1\u7406\u547d\u4ee4\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"mysql-%e8%a1%a8%e7%ae%a1%e7%90%86%e5%91%bd%e4%bb%a4%e4%bb%8b%e7%b4%b9-PHfuqMSNCE\">MySQL \u8868\u7ba1\u7406\u547d\u4ee4\u4ecb\u7d39<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\uff0c\u638c\u63e1 MySQL \u7684\u8868\u7ba1\u7406\u547d\u4ee4\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684 MySQL \u8868\u7ba1\u7406\u547d\u4ee4\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u8868\u3002<\/p>\n<h2 id=\"1-%e5%89%b5%e5%bb%ba%e8%a1%a8-PHfuqMSNCE\">1. \u5275\u5efa\u8868<\/h2>\n<p>\u5275\u5efa\u65b0\u8868\u7684\u547d\u4ee4\u662f <code>CREATE TABLE<\/code>\u3002\u9019\u500b\u547d\u4ee4\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u8868\u7684\u7d50\u69cb\uff0c\u5305\u62ec\u6b04\u4f4d\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u53ca\u7d04\u675f\u689d\u4ef6\u3002<\/p>\n<pre><code>CREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(100) NOT NULL UNIQUE,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\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\uff0c\u5305\u542b\u56db\u500b\u6b04\u4f4d\uff1a<code>id<\/code>\u3001<code>username<\/code>\u3001<code>email<\/code> \u548c <code>created_at<\/code>\u3002<\/p>\n<h2 id=\"2-%e6%9f%a5%e7%9c%8b%e8%a1%a8%e7%b5%90%e6%a7%8b-PHfuqMSNCE\">2. \u67e5\u770b\u8868\u7d50\u69cb<\/h2>\n<p>\u8981\u67e5\u770b\u8868\u7684\u7d50\u69cb\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DESCRIBE<\/code> \u6216 <code>SHOW COLUMNS<\/code> \u547d\u4ee4\u3002<\/p>\n<pre><code>DESCRIBE users;<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793a <code>users<\/code> \u8868\u7684\u6240\u6709\u6b04\u4f4d\u53ca\u5176\u5c6c\u6027\u3002<\/p>\n<h2 id=\"3-%e4%bf%ae%e6%94%b9%e8%a1%a8%e7%b5%90%e6%a7%8b-PHfuqMSNCE\">3. \u4fee\u6539\u8868\u7d50\u69cb<\/h2>\n<p>\u5982\u679c\u9700\u8981\u4fee\u6539\u5df2\u5b58\u5728\u7684\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u6b04\u4f4d\u3002<\/p>\n<pre><code>ALTER TABLE users ADD COLUMN age INT;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u547d\u4ee4\u5c07\u5728 <code>users<\/code> \u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u65b0\u6b04\u4f4d\u3002<\/p>\n<h2 id=\"4-%e5%88%aa%e9%99%a4%e8%a1%a8-PHfuqMSNCE\">4. \u522a\u9664\u8868<\/h2>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u4e00\u500b\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DROP TABLE<\/code> \u547d\u4ee4\u3002\u9019\u500b\u64cd\u4f5c\u662f\u4e0d\u53ef\u9006\u7684\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u4e4b\u524d\u9700\u8981\u8b39\u614e\u8003\u616e\u3002<\/p>\n<pre><code>DROP TABLE users;<\/code><\/pre>\n<p>\u9019\u5c07\u6c38\u4e45\u522a\u9664 <code>users<\/code> \u8868\u53ca\u5176\u6240\u6709\u6578\u64da\u3002<\/p>\n<h2 id=\"5-%e8%a4%87%e8%a3%bd%e8%a1%a8-PHfuqMSNCE\">5. \u8907\u88fd\u8868<\/h2>\n<p>\u6709\u6642\u5019\u9700\u8981\u8907\u88fd\u4e00\u500b\u8868\u7684\u7d50\u69cb\u6216\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>CREATE TABLE ... AS<\/code> \u547d\u4ee4\u3002<\/p>\n<pre><code>CREATE TABLE users_backup AS SELECT * FROM users;<\/code><\/pre>\n<p>\u9019\u5c07\u5275\u5efa\u4e00\u500b\u540d\u70ba <code>users_backup<\/code> \u7684\u65b0\u8868\uff0c\u4e26\u5c07 <code>users<\/code> \u8868\u4e2d\u7684\u6240\u6709\u6578\u64da\u8907\u88fd\u904e\u53bb\u3002<\/p>\n<h2 id=\"6-%e6%b7%bb%e5%8a%a0%e7%b4%a2%e5%bc%95-PHfuqMSNCE\">6. \u6dfb\u52a0\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f7f\u7528 <code>CREATE INDEX<\/code> \u547d\u4ee4\u53ef\u4ee5\u70ba\u8868\u6dfb\u52a0\u7d22\u5f15\u3002<\/p>\n<pre><code>CREATE INDEX idx_username ON users (username);<\/code><\/pre>\n<p>\u9019\u5c07\u5728 <code>username<\/code> \u6b04\u4f4d\u4e0a\u5275\u5efa\u4e00\u500b\u7d22\u5f15\uff0c\u5f9e\u800c\u52a0\u5feb\u57fa\u65bc\u8a72\u6b04\u4f4d\u7684\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n<h2 id=\"7-%e5%88%aa%e9%99%a4%e7%b4%a2%e5%bc%95-PHfuqMSNCE\">7. \u522a\u9664\u7d22\u5f15<\/h2>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DROP INDEX<\/code> \u547d\u4ee4\u3002<\/p>\n<pre><code>DROP INDEX idx_username ON users;<\/code><\/pre>\n<p>\u9019\u5c07\u522a\u9664\u5728 <code>username<\/code> \u6b04\u4f4d\u4e0a\u5275\u5efa\u7684\u7d22\u5f15\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-PHfuqMSNCE\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1 MySQL \u7684\u8868\u7ba1\u7406\u547d\u4ee4\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6709\u6548\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u5f9e\u5275\u5efa\u8868\u5230\u4fee\u6539\u7d50\u69cb\uff0c\u518d\u5230\u7d22\u5f15\u7684\u6dfb\u52a0\u548c\u522a\u9664\uff0c\u9019\u4e9b\u547d\u4ee4\u90fd\u80fd\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7ba1\u7406\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u7121\u8ad6\u662f\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u547d\u4ee4\u5c07\u4f7f\u60a8\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e0a\u66f4\u52a0\u5f97\u5fc3\u61c9\u624b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 MySQL \u8868\u7ba1\u7406\u547d\u4ee4\uff0c\u638c\u63e1\u5275\u5efa\u3001\u4fee\u6539\u3001\u522a\u9664\u8868\u7684\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\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-75768","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75768","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=75768"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75768\/revisions"}],"predecessor-version":[{"id":75769,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75768\/revisions\/75769"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75768"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75768"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75768"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}