{"id":76302,"date":"2024-10-16T05:32:14","date_gmt":"2024-10-15T21:32:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76302\/"},"modified":"2024-10-16T05:32:14","modified_gmt":"2024-10-15T21:32:14","slug":"mysql%e8%a8%ad%e7%bd%ae%e7%95%b6%e5%89%8d%e6%99%82%e9%96%93%e7%82%ba%e9%bb%98%e8%aa%8d%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76302\/","title":{"rendered":"MySQL\u8a2d\u7f6e\u7576\u524d\u6642\u9593\u70ba\u9ed8\u8a8d\u503c\u7684\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"mysql%e8%a8%ad%e7%bd%ae%e7%95%b6%e5%89%8d%e6%99%82%e9%96%93%e7%82%ba%e9%bb%98%e8%aa%8d%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95-fvCxSTMvck\">MySQL\u8a2d\u7f6e\u7576\u524d\u6642\u9593\u70ba\u9ed8\u8a8d\u503c\u7684\u65b9\u6cd5<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u8a2d\u7f6e\u7576\u524d\u6642\u9593\u70ba\u9ed8\u8a8d\u503c\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u9019\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\u8a18\u9304\u5275\u5efa\u6642\u9593\u6216\u66f4\u65b0\u6642\u9593\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728MySQL\u4e2d\u8a2d\u7f6e\u7576\u524d\u6642\u9593\u70ba\u9ed8\u8a8d\u503c\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8datetime%e6%88%96timestamp%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-fvCxSTMvck\">1. \u4f7f\u7528DATETIME\u6216TIMESTAMP\u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u901a\u5e38\u4f7f\u7528DATETIME\u6216TIMESTAMP\u6578\u64da\u985e\u578b\u4f86\u5b58\u5132\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u5169\u8005\u4e4b\u9593\u7684\u4e3b\u8981\u5340\u5225\u5728\u65bc\uff0cDATETIME\u7684\u7bc4\u570d\u662f\u5f9e\u516c\u51431000\u5e74\u5230\u516c\u51439999\u5e74\uff0c\u800cTIMESTAMP\u7684\u7bc4\u570d\u662f\u5f9e1970\u5e741\u67081\u65e5\u52302038\u5e741\u670819\u65e5\u3002TIMESTAMP\u9084\u6703\u6839\u64da\u6642\u5340\u81ea\u52d5\u8f49\u63db\uff0c\u800cDATETIME\u5247\u4e0d\u6703\u3002<\/p>\n<h2 id=\"2-%e8%a8%ad%e7%bd%ae%e9%bb%98%e8%aa%8d%e5%80%bc%e7%82%ba%e7%95%b6%e5%89%8d%e6%99%82%e9%96%93-fvCxSTMvck\">2. \u8a2d\u7f6e\u9ed8\u8a8d\u503c\u70ba\u7576\u524d\u6642\u9593<\/h2>\n<p>\u8981\u5c07\u67d0\u500b\u5217\u7684\u9ed8\u8a8d\u503c\u8a2d\u7f6e\u70ba\u7576\u524d\u6642\u9593\uff0c\u53ef\u4ee5\u5728\u5275\u5efa\u8868\u6642\u4f7f\u7528DEFAULT CURRENT_TIMESTAMP\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u4e00\u500b\u5305\u542b\u7576\u524d\u6642\u9593\u9ed8\u8a8d\u503c\u7684\u8868\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE example_table (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0c\u5982\u679c\u6c92\u6709\u63d0\u4f9bcreated_at\u7684\u503c\uff0cMySQL\u5c07\u81ea\u52d5\u4f7f\u7528\u7576\u524d\u6642\u9593\u4f5c\u70ba\u9ed8\u8a8d\u503c\u3002<\/p>\n<h2 id=\"3-%e6%9b%b4%e6%96%b0%e7%8f%be%e6%9c%89%e8%a1%a8%e7%9a%84%e9%bb%98%e8%aa%8d%e5%80%bc-fvCxSTMvck\">3. \u66f4\u65b0\u73fe\u6709\u8868\u7684\u9ed8\u8a8d\u503c<\/h2>\n<p>\u5982\u679c\u60a8\u5df2\u7d93\u6709\u4e00\u500b\u8868\u4e26\u5e0c\u671b\u5c07\u67d0\u500b\u5217\u7684\u9ed8\u8a8d\u503c\u66f4\u6539\u70ba\u7576\u524d\u6642\u9593\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u66f4\u65b0\u73fe\u6709\u8868\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>ALTER TABLE example_table\nMODIFY COLUMN created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u60a8\u5c31\u53ef\u4ee5\u5c07created_at\u5217\u7684\u9ed8\u8a8d\u503c\u8a2d\u7f6e\u70ba\u7576\u524d\u6642\u9593\u3002<\/p>\n<h2 id=\"4-%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-fvCxSTMvck\">4. \u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u6642\u5340\u554f\u984c\uff1a<\/strong>\u78ba\u4fdd\u60a8\u7684MySQL\u670d\u52d9\u5668\u6642\u5340\u8a2d\u7f6e\u6b63\u78ba\uff0c\u5426\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u6642\u9593\u4e0d\u6e96\u78ba\u3002<\/li>\n<li><strong>NULL\u503c\uff1a<\/strong>\u5982\u679c\u60a8\u5e0c\u671b\u5728\u63d2\u5165\u6642\u5141\u8a31NULL\u503c\uff0c\u5247\u9700\u8981\u5728\u5217\u5b9a\u7fa9\u4e2d\u660e\u78ba\u6307\u5b9a\u3002<\/li>\n<li><strong>\u81ea\u52d5\u66f4\u65b0\uff1a<\/strong>\u5982\u679c\u60a8\u5e0c\u671b\u5728\u6bcf\u6b21\u66f4\u65b0\u6642\u81ea\u52d5\u66f4\u65b0\u6642\u9593\uff0c\u53ef\u4ee5\u4f7f\u7528ON UPDATE CURRENT_TIMESTAMP\u8a9e\u53e5\u3002<\/li>\n<\/ul>\n<h2 id=\"5-%e7%a4%ba%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e5%ae%8c%e6%95%b4%e7%9a%84%e8%a1%a8-fvCxSTMvck\">5. \u793a\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u5b8c\u6574\u7684\u8868<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5b8c\u6574\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5275\u5efa\u4e00\u500b\u5305\u542b\u7576\u524d\u6642\u9593\u9ed8\u8a8d\u503c\u7684\u8868\uff0c\u4e26\u5728\u6bcf\u6b21\u66f4\u65b0\u6642\u81ea\u52d5\u66f4\u65b0\u6642\u9593\uff1a<\/p>\n<pre><code>CREATE TABLE example_table (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,\n    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0ccreated_at\u5217\u5c07\u5728\u63d2\u5165\u6642\u81ea\u52d5\u8a2d\u7f6e\u70ba\u7576\u524d\u6642\u9593\uff0c\u800cupdated_at\u5217\u5247\u6703\u5728\u6bcf\u6b21\u66f4\u65b0\u6642\u81ea\u52d5\u66f4\u65b0\u70ba\u7576\u524d\u6642\u9593\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fvCxSTMvck\">\u7e3d\u7d50<\/h2>\n<p>\u8a2d\u7f6eMySQL\u4e2d\u7684\u7576\u524d\u6642\u9593\u70ba\u9ed8\u8a8d\u503c\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7ba1\u7406\u6578\u64da\u3002\u901a\u904e\u4f7f\u7528DATETIME\u6216TIMESTAMP\u6578\u64da\u985e\u578b\uff0c\u4e26\u5229\u7528DEFAULT CURRENT_TIMESTAMP\u8a9e\u53e5\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u5be6\u73fe\u9019\u4e00\u529f\u80fd\u3002\u7121\u8ad6\u662f\u5728\u5275\u5efa\u65b0\u8868\u9084\u662f\u66f4\u65b0\u73fe\u6709\u8868\uff0c\u9019\u4e9b\u65b9\u6cd5\u90fd\u80fd\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u8655\u7406\u6642\u9593\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728MySQL\u4e2d\u8a2d\u7f6e\u7576\u524d\u6642\u9593\u70ba\u9ed8\u8a8d\u503c\uff0c\u7c21\u5316\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u63d0\u5347\u6578\u64da\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-76302","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76302","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=76302"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76302\/revisions"}],"predecessor-version":[{"id":76303,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76302\/revisions\/76303"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}