{"id":200754,"date":"2025-05-06T13:19:21","date_gmt":"2025-05-06T05:19:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200754\/"},"modified":"2025-05-06T13:19:21","modified_gmt":"2025-05-06T05:19:21","slug":"mysql-%e9%bb%98%e8%ae%a4%e5%80%bc%e6%b7%bb%e5%8a%a0%e5%bc%95%e5%8f%b7%e7%9a%84%e8%a7%84%e5%88%99%ef%bc%9a%e4%bd%95%e6%97%b6%e9%9c%80%e8%a6%81%e6%b7%bb%e5%8a%a0%e5%bc%95%e5%8f%b7%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200754\/","title":{"rendered":"MySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>MySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f <\/h1>\n<p>\u5728IT\u884c\u4e1a\u8fd9\u4e2a\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u5f88\u5feb\u7684\u884c\u4e1a\uff0c\u53ea\u6709\u4e0d\u505c\u6b62\u7684\u5b66\u4e60\uff0c\u624d\u4e0d\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u5982\u679c\u4f60\u662f\u6570\u636e\u5e93\u5b66\u4e60\u8005\uff0c\u90a3\u4e48\u672c\u6587\u300aMySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f \u300b\u5c31\u5f88\u9002\u5408\u4f60\uff01\u672c\u7bc7\u5185\u5bb9\u4e3b\u8981\u5305\u62ec##content_title##\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241113\/17314839476734592b801de.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>mysql \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219<\/strong><\/p>\n<p>\u5728 mysql \u4e2d\u8bbe\u7f6e\u5217\u7684\u9ed8\u8ba4\u503c\u65f6\uff0c\u662f\u5426\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\u53d6\u51b3\u4e8e\u8be5\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u5b57\u7b26\u4e32\u7c7b\u578b\uff08char\/varchar\/text\/blob \u7b49\uff09<\/strong>\uff1a\u9700\u8981\u6dfb\u52a0\u5355\u5f15\u53f7\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>alter table table_name add column_name varchar(255) default 'my_default_value';<\/pre>\n<ul>\n<li><strong>\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\uff08int\/datetime\/decimal \u7b49\uff09<\/strong>\uff1a\u4e0d\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>alter table table_name add column_name int default 3600;<\/pre>\n<p>\u539f\u56e0\u662f\uff0c\u5b57\u7b26\u4e32\u7c7b\u578b\u503c\u5fc5\u987b\u7528\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\u800c\u6570\u5b57\u548c\u65e5\u671f\u7b49\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\u503c\u5219\u4e0d\u9700\u8981\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6839\u636e\u60a8\u7ed9\u51fa\u7684\u793a\u4f8b\uff0c\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u8bbe\u7f6e\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\uff08bigint unsigned\uff09\u7684\u9ed8\u8ba4\u503c\u4e3a 3600 \u662f\u6b63\u786e\u7684\uff1a<\/p>\n<pre>ALTER TABLE qra_works ADD upgraded_time BIGINT UNSIGNED NOT NULL DEFAULT 3600 AFTER created_time;<\/pre>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6570\u636e\u5e93\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>MySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219&#46;&#46;&#46;<\/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-200754","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200754","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=200754"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200754\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}