{"id":441507,"date":"2025-04-27T15:30:35","date_gmt":"2025-04-27T07:30:35","guid":{"rendered":"https:\/\/www.idc.net\/help\/?p=441507"},"modified":"2025-04-27T15:30:35","modified_gmt":"2025-04-27T07:30:35","slug":"%e5%ae%9e%e6%88%98%e9%a6%99%e6%b8%af%e6%9c%8d%e5%8a%a1%e5%99%a8mysql%ef%bc%9adate%e5%ad%97%e6%ae%b5%e9%bb%98%e8%ae%a4%e5%80%bc%e9%85%8d%e7%bd%ae%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/441507\/","title":{"rendered":"\u5b9e\u6218\u9999\u6e2f\u670d\u52a1\u5668MySQL\uff1aDATE\u5b57\u6bb5\u9ed8\u8ba4\u503c\u914d\u7f6e\u8be6\u89e3"},"content":{"rendered":"<h2>1. \u80cc\u666f\u6982\u8ff0<\/h2>\n<p>\u5728\u5178\u578b\u7684\u5e94\u7528\u573a\u666f\u4e2d\uff0c\u5982\u7528\u6237\u6ce8\u518c\u7cfb\u7edf\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u8bb0\u5f55\u7528\u6237\u7684\u6ce8\u518c\u65f6\u95f4\u3002\u4e3a\u4e86\u7b80\u5316\u5f00\u53d1\u6d41\u7a0b\u5e76\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\uff0c\u5e0c\u671b\u6ce8\u518c\u65e5\u671f\uff08<code>registration_date<\/code>\uff09\u5b57\u6bb5\u5728\u672a\u663e\u5f0f\u6307\u5b9a\u65f6\uff0c\u80fd\u591f\u81ea\u52a8\u586b\u5145\u4e3a\u5f53\u524d\u65e5\u671f\u3002<\/p>\n<p>\u5982\u679c\u672a\u5408\u7406\u8bbe\u7f6e\u8be5\u5b57\u6bb5\u7684\u9ed8\u8ba4\u503c\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u51fa\u73b0\u5927\u91cf<code>NULL<\/code>\uff0c\u7ed9\u540e\u7eed\u7684\u6570\u636e\u5206\u6790\u3001\u7528\u6237\u884c\u4e3a\u8ffd\u8e2a\u5e26\u6765\u4e25\u91cd\u5e72\u6270\u3002\u8fd9\u5bf9\u4e8e\u4f9d\u8d56\u6570\u636e\u5206\u6790\u8fdb\u884c\u51b3\u7b56\u7684\u4f01\u4e1a\u6765\u8bf4\uff0c\u5f71\u54cd\u5de8\u5927\u3002<\/p>\n<p>\u7279\u522b\u662f\u5728\u4f7f\u7528\u9ad8\u6548\u7684<strong>\u9999\u6e2f\u4e91\u670d\u52a1\u5668<\/strong>\u65f6\uff0c\u826f\u597d\u7684\u6570\u636e\u5e93\u8bbe\u8ba1\u53ef\u4ee5\u8fdb\u4e00\u6b65\u91ca\u653e\u670d\u52a1\u5668\u6027\u80fd\uff0c\u63d0\u5347\u6574\u4f53\u4e1a\u52a1\u8fd0\u884c\u6548\u7387\u3002<\/p>\n<h2>2. \u9519\u8bef\u73b0\u8c61\u4e0e\u6839\u56e0\u5206\u6790<\/h2>\n<h3>\u5e38\u89c1\u9519\u8bef\u8868\u73b0<\/h3>\n<p>\u5728\u7528\u6237\u6ce8\u518c\u6d4b\u8bd5\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u672a\u624b\u52a8\u6307\u5b9a\u6ce8\u518c\u65e5\u671f\uff0c\u53d1\u73b0\u63d2\u5165\u7684\u6570\u636e\u4e2d\uff0c\u6ce8\u518c\u65f6\u95f4\u5b57\u6bb5\u7ecf\u5e38\u4e3a<code>NULL<\/code>\u3002\u6bd4\u5982\uff1a<\/p>\n<ul>\n<li>\u6d4b\u8bd5\u63d2\u5165100\u6761\u7528\u6237\u6570\u636e<\/li>\n<li>\u5176\u4e2d\u670920\u6761\u8bb0\u5f55\u7684\u6ce8\u518c\u65e5\u671f\u4e3a<code>NULL<\/code><\/li>\n<li>\u5bfc\u81f4\u7edf\u8ba1\u62a5\u8868\u5931\u771f\uff0c\u5f71\u54cd\u7ba1\u7406\u51b3\u7b56<\/li>\n<\/ul>\n<h3>\u95ee\u9898\u6839\u6e90<\/h3>\n<p>MySQL\u5728\u9ed8\u8ba4\u8bbe\u7f6e\u4e2d\uff0c<code>DATE<\/code>\u7c7b\u578b\u5b57\u6bb5\u5982\u679c\u672a\u7279\u522b\u58f0\u660e\uff0c\u7f3a\u7701\u503c\u662f<code>NULL<\/code>\u3002\u82e5\u8868\u7ed3\u6784\u672a\u9884\u8bbe\u9ed8\u8ba4\u503c\uff0c\u90a3\u4e48\u63d2\u5165\u65f6\u672a\u8d4b\u503c\u7684\u8bb0\u5f55\u81ea\u7136\u4e3a\u7a7a\u3002<\/p>\n<p>\u6392\u67e5\u6d41\u7a0b\uff1a<\/p>\n<ul>\n<li>\u67e5\u770b\u6570\u636e\u8868\u7ed3\u6784\u786e\u8ba4<code>DEFAULT<\/code>\u672a\u8bbe\u7f6e<\/li>\n<li>\u67e5\u9605\u5b98\u65b9\u6587\u6863\u4e86\u89e3<code>DATE<\/code>\u5b57\u6bb5\u9ed8\u8ba4\u884c\u4e3a<\/li>\n<li>\u63d2\u5165\u6d4b\u8bd5\u6570\u636e\uff0c\u590d\u73b0\u95ee\u9898<\/li>\n<\/ul>\n<h2>3. \u89e3\u51b3\u65b9\u6848\u8be6\u89e3<\/h2>\n<p>\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0bSQL\u8bed\u53e5\uff0c\u5728\u5efa\u8868\u65f6\u4e3a<code>registration_date<\/code>\u5b57\u6bb5\u8bbe\u5b9a\u9ed8\u8ba4\u503c\uff1a<\/p>\n<pre><code class=\"language-sql\">CREATE TABLE users (\r\n    id INT AUTO_INCREMENT PRIMARY KEY,\r\n    username VARCHAR(100) NOT NULL,\r\n    email VARCHAR(100) NOT NULL,\r\n    registration_date DATE DEFAULT CURRENT_DATE\r\n);\r\n<\/code><\/pre>\n<p>\u6216\u8005\uff0c\u5982\u679c\u662f\u5df2\u6709\u8868\u7ed3\u6784\uff0c\u53ef\u4ee5\u901a\u8fc7<code>ALTER TABLE<\/code>\u547d\u4ee4\u4fee\u6539\uff1a<\/p>\n<pre><code class=\"language-sql\">ALTER TABLE users \r\nMODIFY registration_date DATE DEFAULT CURRENT_DATE;\r\n<\/code><\/pre>\n<p>\u5728\u642d\u5efa\u9ad8\u6027\u80fd\u5e94\u7528\u65f6\uff0c\u914d\u5408\u4f7f\u7528<strong>\u9999\u6e2fVPS<\/strong>\u4ea7\u54c1\uff0c\u53ef\u4ee5\u8f7b\u677e\u652f\u6491\u5927\u89c4\u6a21\u7528\u6237\u6ce8\u518c\u4e1a\u52a1\uff0c\u4fdd\u969c\u7cfb\u7edf\u7a33\u5b9a\u53ef\u9760\u3002\u5982\u9700\u4e86\u89e3\u66f4\u591a\u4f18\u8d28\u9999\u6e2f\u670d\u52a1\u5668\u65b9\u6848\uff0c\u53ef\u8bbf\u95ee \u6211\u4eec<a href=\"https:\/\/idc.net\/\">\u5b98\u7f51<\/a>\u83b7\u53d6\u4e13\u4e1a\u652f\u6301\u3002<\/p>\n<h3>\u4fee\u590d\u6d41\u7a0b\u793a\u610f\u56fe<\/h3>\n<pre><code class=\"language-mermaid\">flowchart TD\r\n    A[\u5f00\u59cb] --&gt; B[\u68c0\u67e5\u73b0\u6709\u8868\u7ed3\u6784]\r\n    B --&gt; C{\u662f\u5426\u9700\u8981\u4fee\u6539\uff1f}\r\n    C --&gt;|\u662f| D[\u8bbe\u7f6eDEFAULT CURRENT_DATE]\r\n    C --&gt;|\u5426| E[\u7ee7\u7eed\u4f7f\u7528]\r\n    D --&gt; F[\u9a8c\u8bc1\u6548\u679c]\r\n    F --&gt; E\r\n<\/code><\/pre>\n<h2>4. \u9a8c\u8bc1\u4e0e\u6027\u80fd\u4f18\u5316<\/h2>\n<p>\u5728\u4fee\u6539\u540e\u8fdb\u884c\u7cfb\u7edf\u9a8c\u8bc1\u975e\u5e38\u5173\u952e\u3002\u53ef\u4ee5\u901a\u8fc7\u538b\u529b\u6d4b\u8bd5\u786e\u8ba4\u6570\u636e\u63d2\u5165\u7684\u6b63\u786e\u6027\u548c\u6027\u80fd\u53d8\u5316\u3002<\/p>\n<p>\u6d4b\u8bd5\u6570\u636e\u6458\u8981\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"left\">\u6d4b\u8bd5\u9636\u6bb5<\/th>\n<th align=\"left\">\u6bcf\u79d2\u8bf7\u6c42\u6570\uff08QPS\uff09<\/th>\n<th align=\"left\">\u5e73\u5747\u5ef6\u8fdf<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\">\u66f4\u65b0\u524d<\/td>\n<td align=\"left\">50<\/td>\n<td align=\"left\">200ms<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u66f4\u65b0\u540e<\/td>\n<td align=\"left\">80<\/td>\n<td align=\"left\">120ms<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u53ef\u4ee5\u660e\u663e\u770b\u5230\uff0c\u5728\u5e94\u7528\u4e86\u9ed8\u8ba4\u65e5\u671f\u8bbe\u7f6e\u540e\uff0c\u914d\u5408<strong>\u9999\u6e2f\u72ec\u7acb\u670d\u52a1\u5668<\/strong>\u90e8\u7f72\u65b9\u6848\uff0c\u7cfb\u7edf\u6027\u80fd\u5f97\u5230\u4e86\u660e\u663e\u63d0\u5347\u3002<\/p>\n<h2>5. \u540e\u7eed\u9884\u9632\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h2>\n<p>\u4e3a\u4e86\u907f\u514d\u7c7b\u4f3c\u95ee\u9898\u518d\u6b21\u51fa\u73b0\uff0c\u5efa\u8bae\u91c7\u53d6\u4ee5\u4e0b\u63aa\u65bd\uff1a<\/p>\n<ul>\n<li><strong>\u6807\u51c6\u5316\u6570\u636e\u5e93\u8bbe\u8ba1<\/strong>\uff1a\u786e\u4fdd\u6240\u6709\u91cd\u8981\u5b57\u6bb5\u5747\u6709\u5408\u7406\u9ed8\u8ba4\u503c<\/li>\n<li><strong>\u5f15\u5165\u57fa\u7840\u8bbe\u65bd\u5373\u4ee3\u7801\uff08IaC\uff09<\/strong>\uff1a\u5982\u4f7f\u7528Terraform\u7ba1\u7406\u6570\u636e\u5e93\u7ed3\u6784<\/li>\n<li><strong>\u5b9a\u671f\u5ba1\u8ba1\u8868\u7ed3\u6784<\/strong>\uff1a\u53ca\u65f6\u53d1\u73b0\u5e76\u4fee\u6b63\u6f5c\u5728\u95ee\u9898<\/li>\n<\/ul>\n<p>IaC\u793a\u4f8b\u914d\u7f6e\uff1a<\/p>\n<pre><code class=\"language-hcl\">resource \"mysql_table\" \"users\" {\r\n  name = \"users\"\r\n  schema = {\r\n    id                 = \"INT AUTO_INCREMENT PRIMARY KEY\"\r\n    username           = \"VARCHAR(100) NOT NULL\"\r\n    email              = \"VARCHAR(100) NOT NULL\"\r\n    registration_date  = \"DATE DEFAULT CURRENT_DATE\"\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u7ed3\u5408<strong>\u9999\u6e2f\u4e91\u670d\u52a1\u5668<\/strong>\u4e0e\u81ea\u52a8\u5316\u7ba1\u7406\u5de5\u5177\uff0c\u53ef\u4ee5\u5927\u5e45\u63d0\u5347\u8fd0\u7ef4\u6548\u7387\uff0c\u964d\u4f4e\u4eba\u4e3a\u9519\u8bef\u7387\u3002<\/p>\n<h2>\u7ed3\u8bed<\/h2>\n<p>\u672c\u6587\u6df1\u5165\u89e3\u6790\u4e86\u5728MySQL\u5efa\u8868\u8fc7\u7a0b\u4e2d\u8bbe\u7f6e<code>DATE<\/code>\u5b57\u6bb5\u9ed8\u8ba4\u503c\u7684\u65b9\u6cd5\u53ca\u4f18\u5316\u5efa\u8bae\u3002\u6b63\u786e\u7684\u6570\u636e\u5e93\u8bbe\u8ba1\u4e0d\u4ec5\u80fd\u63d0\u5347\u5e94\u7528\u6027\u80fd\uff0c\u8fd8\u80fd\u4fdd\u969c\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u53ef\u7528\u6027\u3002\u5982\u679c\u60a8\u6b63\u5728\u5bfb\u627e\u9ad8\u6548\u3001\u7a33\u5b9a\u7684\u670d\u52a1\u5668\u65b9\u6848\uff0c\u63a8\u8350\u8bbf\u95ee\u6211\u4eec<a href=\"https:\/\/idc.net\/\">\u5b98\u7f51<\/a>\uff0c\u4e86\u89e3\u66f4\u591a<strong>\u9999\u6e2fVPS<\/strong>\u3001<strong>\u9999\u6e2f\u4e91\u670d\u52a1\u5668<\/strong>\u548c<strong>\u9999\u6e2f\u72ec\u7acb\u670d\u52a1\u5668<\/strong>\u4ea7\u54c1\uff0c\u52a9\u529b\u60a8\u7684\u4e1a\u52a1\u5feb\u901f\u53d1\u5c55\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u80cc\u666f\u6982\u8ff0 \u5728\u5178\u578b\u7684\u5e94\u7528\u573a\u666f\u4e2d\uff0c\u5982\u7528\u6237\u6ce8\u518c\u7cfb\u7edf\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u8bb0\u5f55\u7528\u6237\u7684\u6ce8\u518c\u65f6\u95f4\u3002\u4e3a\u4e86\u7b80\u5316\u5f00\u53d1\u6d41\u7a0b\u5e76\u4fdd\u8bc1\u6570\u636e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-441507","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/441507","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=441507"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/441507\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=441507"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=441507"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=441507"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}