{"id":173513,"date":"2024-11-07T18:39:22","date_gmt":"2024-11-07T10:39:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173513\/"},"modified":"2024-11-07T18:39:23","modified_gmt":"2024-11-07T10:39:23","slug":"%e5%a6%82%e4%bd%95%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e7%95%b6%e5%89%8d%e6%99%82%e9%96%93%e7%9a%84%e5%ad%97%e6%ae%b5%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e7%8d%b2%e5%8f%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173513\/","title":{"rendered":"\u5982\u4f55\u7372\u53d6\u6578\u64da\u5eab\u7576\u524d\u6642\u9593\u7684\u5b57\u6bb5\uff1f (\u6578\u64da\u5eab\u5b57\u6bb5\u7372\u53d6\u7576\u524d\u6642\u9593)"},"content":{"rendered":"

\u5982\u4f55\u7372\u53d6\u6578\u64da\u5eab\u7576\u524d\u6642\u9593\u7684\u5b57\u6bb5\uff1f (\u6578\u64da\u5eab\u5b57\u6bb5\u7372\u53d6\u7576\u524d\u6642\u9593)<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7372\u53d6\u7576\u524d\u6642\u9593\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5728\u8a18\u9304\u6578\u64da\u7684\u5275\u5efa\u6642\u9593\u3001\u66f4\u65b0\u6642\u9593\uff0c\u9084\u662f\u9032\u884c\u6642\u9593\u6233\u7684\u6bd4\u8f03\uff0c\u4e86\u89e3\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u7576\u524d\u6642\u9593\u7684\u5b57\u6bb5\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u5982\u4f55\u7372\u53d6\u7576\u524d\u6642\u9593\u7684\u5b57\u6bb5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n

1. MySQL \u4e2d\u7372\u53d6\u7576\u524d\u6642\u9593<\/h2>\n

\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 NOW()<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u500b\u51fd\u6578\u8fd4\u56de\u7684\u7d50\u679c\u662f DATETIME<\/code> \u683c\u5f0f\uff0c\u5305\u542b\u4e86\u5e74\u3001\u6708\u3001\u65e5\u3001\u6642\u3001\u5206\u3001\u79d2\u3002<\/p>\n

SELECT NOW();<\/code><\/pre>\n
\u5982\u679c\u4f60\u60f3\u5728\u5275\u5efa\u8868\u6642\u81ea\u52d5\u586b\u5145\u7576\u524d\u6642\u9593\uff0c\u53ef\u4ee5\u5728\u8868\u7684\u5b9a\u7fa9\u4e2d\u4f7f\u7528 DEFAULT CURRENT_TIMESTAMP<\/code>\u3002\u4f8b\u5982\uff1a<\/p>\n
CREATE TABLE example (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n
2. PostgreSQL \u4e2d\u7372\u53d6\u7576\u524d\u6642\u9593<\/h2>\n
\u5728 PostgreSQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 CURRENT_TIMESTAMP<\/code> \u6216 NOW()<\/code> \u4f86\u7372\u53d6\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u5169\u500b\u51fd\u6578\u7684\u6548\u679c\u662f\u76f8\u540c\u7684\uff0c\u8fd4\u56de\u7684\u7d50\u679c\u4e5f\u662f TIMESTAMP<\/code> \u683c\u5f0f\u3002<\/p>\n
SELECT CURRENT_TIMESTAMP;<\/code><\/pre>\n
\u540c\u6a23\u5730\uff0c\u5728\u5275\u5efa\u8868\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 DEFAULT CURRENT_TIMESTAMP<\/code> \u4f86\u81ea\u52d5\u586b\u5145\u6642\u9593\uff1a<\/p>\n
CREATE TABLE example (\n    id SERIAL PRIMARY KEY,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n
3. SQL Server \u4e2d\u7372\u53d6\u7576\u524d\u6642\u9593<\/h2>\n
\u5728 SQL Server \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 GETDATE()<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u500b\u51fd\u6578\u8fd4\u56de\u7684\u7d50\u679c\u662f DATETIME<\/code> \u683c\u5f0f\u3002<\/p>\n
SELECT GETDATE();<\/code><\/pre>\n
\u5728\u5275\u5efa\u8868\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 DEFAULT GETDATE()<\/code> \u4f86\u81ea\u52d5\u586b\u5145\u7576\u524d\u6642\u9593\uff1a<\/p>\n
CREATE TABLE example (\n    id INT IDENTITY PRIMARY KEY,\n    created_at DATETIME DEFAULT GETDATE()\n);<\/code><\/pre>\n
4. Oracle \u4e2d\u7372\u53d6\u7576\u524d\u6642\u9593<\/h2>\n
\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 SYSDATE<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u500b\u51fd\u6578\u8fd4\u56de\u7684\u7d50\u679c\u662f DATE<\/code> \u683c\u5f0f\uff0c\u5305\u542b\u4e86\u5e74\u3001\u6708\u3001\u65e5\u3001\u6642\u3001\u5206\u3001\u79d2\u3002<\/p>\n
SELECT SYSDATE FROM dual;<\/code><\/pre>\n
\u5728\u5275\u5efa\u8868\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 DEFAULT SYSDATE<\/code> \u4f86\u81ea\u52d5\u586b\u5145\u7576\u524d\u6642\u9593\uff1a<\/p>\n
CREATE TABLE example (\n    id NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,\n    created_at DATE DEFAULT SYSDATE\n);<\/code><\/pre>\n
5. \u7e3d\u7d50<\/h2>\n
\u7372\u53d6\u6578\u64da\u5eab\u7576\u524d\u6642\u9593\u7684\u5b57\u6bb5\u5728\u5404\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u90fd\u6709\u5176\u7279\u5b9a\u7684\u5be6\u73fe\u65b9\u5f0f\u3002\u7121\u8ad6\u662f MySQL\u3001PostgreSQL\u3001SQL Server \u9084\u662f Oracle\uff0c\u958b\u767c\u8005\u90fd\u53ef\u4ee5\u5229\u7528\u9019\u4e9b\u5167\u5efa\u51fd\u6578\u4f86\u8f15\u9b06\u7372\u53d6\u7576\u524d\u6642\u9593\u4e26\u5728\u6578\u64da\u8868\u4e2d\u81ea\u52d5\u586b\u5145\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u7684\u6e96\u78ba\u6027\uff0c\u4e5f\u7c21\u5316\u4e86\u6578\u64da\u7ba1\u7406\u7684\u904e\u7a0b\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u904b\u884c\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u7576\u524d\u6642\u9593\u7684\u5b57\u6bb5\uff0c\u7c21\u55ae\u6b65\u9a5f\u6559\u4f60\u8f15\u9b06\u5be6\u73fe\u6642\u9593\u6578\u64da\u7684\u63d0\u53d6\u8207\u4f7f\u7528\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-173513","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173513","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=173513"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173513\/revisions"}],"predecessor-version":[{"id":173514,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173513\/revisions\/173514"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}