{"id":160265,"date":"2024-11-03T21:39:18","date_gmt":"2024-11-03T13:39:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160265\/"},"modified":"2024-11-03T21:39:20","modified_gmt":"2024-11-03T13:39:20","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-systimestamp","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160265\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase SYSTIMESTAMP"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-systimestamp-caCZeBTleX\">OceanBase \u6559\u7a0b\uff1aOceanBase SYSTIMESTAMP<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6642\u9593\u6233\u7684\u7ba1\u7406\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002OceanBase \u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u5206\u4f48\u5f0f\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6642\u9593\u6233\u529f\u80fd\uff0c\u5176\u4e2d <code>SYSTIMESTAMP<\/code> \u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u529f\u80fd\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e OceanBase \u4e2d\u7684 <code>SYSTIMESTAMP<\/code>\uff0c\u5176\u7528\u6cd5\u53ca\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-systimestamp%ef%bc%9f-caCZeBTleX\">\u4ec0\u9ebc\u662f SYSTIMESTAMP\uff1f<\/h2>\n<p><code>SYSTIMESTAMP<\/code> \u662f\u4e00\u500b\u7528\u65bc\u7372\u53d6\u7576\u524d\u7cfb\u7d71\u6642\u9593\u6233\u7684\u51fd\u6578\u3002\u5b83\u8fd4\u56de\u4e00\u500b\u5305\u542b\u7576\u524d\u65e5\u671f\u548c\u6642\u9593\u7684\u6642\u9593\u6233\uff0c\u4e26\u4e14\u901a\u5e38\u4ee5 UTC \u6642\u5340\u986f\u793a\u3002\u9019\u5c0d\u65bc\u9700\u8981\u7cbe\u78ba\u6642\u9593\u8a18\u9304\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\u975e\u5e38\u91cd\u8981\uff0c\u4f8b\u5982\u5728\u4ea4\u6613\u7cfb\u7d71\u4e2d\u8a18\u9304\u4ea4\u6613\u6642\u9593\u3002<\/p>\n<h2 id=\"systimestamp-%e7%9a%84%e8%aa%9e%e6%b3%95-caCZeBTleX\">SYSTIMESTAMP \u7684\u8a9e\u6cd5<\/h2>\n<p>\u5728 OceanBase \u4e2d\uff0c\u4f7f\u7528 <code>SYSTIMESTAMP<\/code> \u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SYSTIMESTAMP<\/code><\/pre>\n<p>\u9019\u500b\u51fd\u6578\u4e0d\u9700\u8981\u4efb\u4f55\u53c3\u6578\uff0c\u76f4\u63a5\u8abf\u7528\u5373\u53ef\u7372\u53d6\u7576\u524d\u7684\u7cfb\u7d71\u6642\u9593\u6233\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-caCZeBTleX\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 <code>SYSTIMESTAMP<\/code> \u7684\u7bc4\u4f8b\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u5176\u7528\u6cd5\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-1%ef%bc%9a%e7%8d%b2%e5%8f%96%e7%95%b6%e5%89%8d%e6%99%82%e9%96%93%e6%88%b3-caCZeBTleX\">\u7bc4\u4f8b 1\uff1a\u7372\u53d6\u7576\u524d\u6642\u9593\u6233<\/h3>\n<pre><code>SELECT SYSTIMESTAMP AS current_time FROM dual;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u7576\u524d\u7684\u7cfb\u7d71\u6642\u9593\u6233\uff0c\u4e26\u5c07\u5176\u547d\u540d\u70ba <code>current_time<\/code>\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-2%ef%bc%9a%e8%88%87%e5%85%b6%e4%bb%96%e6%99%82%e9%96%93%e6%88%b3%e6%af%94%e8%bc%83-caCZeBTleX\">\u7bc4\u4f8b 2\uff1a\u8207\u5176\u4ed6\u6642\u9593\u6233\u6bd4\u8f03<\/h3>\n<pre><code>SELECT SYSTIMESTAMP AS current_time, \n       TO_TIMESTAMP('2023-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS') AS fixed_time,\n       CASE \n           WHEN SYSTIMESTAMP &gt; TO_TIMESTAMP('2023-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS') \n           THEN 'Current time is after fixed time' \n           ELSE 'Current time is before or equal to fixed time' \n       END AS comparison_result \nFROM dual;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u4e0d\u50c5\u7372\u53d6\u7576\u524d\u6642\u9593\u6233\uff0c\u9084\u5c07\u5176\u8207\u4e00\u500b\u56fa\u5b9a\u7684\u6642\u9593\u6233\u9032\u884c\u6bd4\u8f03\uff0c\u4e26\u8fd4\u56de\u6bd4\u8f03\u7d50\u679c\u3002<\/p>\n<h2 id=\"systimestamp-%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-caCZeBTleX\">SYSTIMESTAMP \u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p><code>SYSTIMESTAMP<\/code> \u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u65e5\u8a8c\u8a18\u9304\uff1a<\/strong>\u5728\u61c9\u7528\u7a0b\u5e8f\u4e2d\u8a18\u9304\u4e8b\u4ef6\u6642\uff0c\u4f7f\u7528 <code>SYSTIMESTAMP<\/code> \u53ef\u4ee5\u78ba\u4fdd\u6bcf\u500b\u4e8b\u4ef6\u90fd\u6709\u6e96\u78ba\u7684\u6642\u9593\u6233\u3002<\/li>\n<li><strong>\u4ea4\u6613\u7cfb\u7d71\uff1a<\/strong>\u5728\u91d1\u878d\u4ea4\u6613\u4e2d\uff0c\u6e96\u78ba\u7684\u6642\u9593\u6233\u5c0d\u65bc\u4ea4\u6613\u7684\u6709\u6548\u6027\u548c\u53ef\u8ffd\u6eaf\u6027\u81f3\u95dc\u91cd\u8981\u3002<\/li>\n<li><strong>\u6578\u64da\u540c\u6b65\uff1a<\/strong>\u5728\u591a\u500b\u7cfb\u7d71\u4e4b\u9593\u540c\u6b65\u6578\u64da\u6642\uff0c\u4f7f\u7528 <code>SYSTIMESTAMP<\/code> \u53ef\u4ee5\u5e6b\u52a9\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-caCZeBTleX\">\u7e3d\u7d50<\/h2>\n<p>OceanBase \u7684 <code>SYSTIMESTAMP<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u6e96\u78ba\u7684\u7cfb\u7d71\u6642\u9593\u6233\u3002\u7121\u8ad6\u662f\u5728\u65e5\u8a8c\u8a18\u9304\u3001\u4ea4\u6613\u7cfb\u7d71\u9084\u662f\u6578\u64da\u540c\u6b65\u4e2d\uff0c<code>SYSTIMESTAMP<\/code> \u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u548c\u53ef\u9760\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u4f86\u904b\u884c OceanBase \u5c07\u662f\u660e\u667a\u7684\u9078\u64c7\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to use OceanBase SYSTIMESTAMP in this comprehensive tutorial, covering syntax, examples, and practical applications for accurate time management.<\/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-160265","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160265","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=160265"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160265\/revisions"}],"predecessor-version":[{"id":160266,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160265\/revisions\/160266"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}