{"id":94638,"date":"2024-10-19T19:55:18","date_gmt":"2024-10-19T11:55:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94638\/"},"modified":"2024-10-19T19:55:19","modified_gmt":"2024-10-19T11:55:19","slug":"oracle-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%99%82%e9%96%93%e5%95%8f%e9%a1%8c%e6%af%94%e8%bc%83","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94638\/","title":{"rendered":"Oracle \u6578\u64da\u5eab\u4e2d\u6642\u9593\u554f\u984c\u6bd4\u8f03"},"content":{"rendered":"<h1 id=\"oracle-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%99%82%e9%96%93%e5%95%8f%e9%a1%8c%e6%af%94%e8%bc%83-dBxDihrYnn\">Oracle \u6578\u64da\u5eab\u4e2d\u6642\u9593\u554f\u984c\u6bd4\u8f03<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6642\u9593\u7684\u8655\u7406\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u554f\u984c\u3002Oracle \u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6642\u9593\u6578\u64da\u985e\u578b\u548c\u51fd\u6578\u4f86\u8655\u7406\u6642\u9593\u548c\u65e5\u671f\u3002\u672c\u6587\u5c07\u63a2\u8a0e Oracle \u6578\u64da\u5eab\u4e2d\u6642\u9593\u554f\u984c\u7684\u4e0d\u540c\u65b9\u9762\uff0c\u5305\u62ec\u6642\u9593\u6578\u64da\u985e\u578b\u3001\u6642\u9593\u51fd\u6578\u7684\u4f7f\u7528\u4ee5\u53ca\u5e38\u898b\u7684\u6642\u9593\u554f\u984c\u3002<\/p>\n<h2 id=\"1-oracle-%e7%9a%84%e6%99%82%e9%96%93%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-dBxDihrYnn\">1. Oracle \u7684\u6642\u9593\u6578\u64da\u985e\u578b<\/h2>\n<p>Oracle \u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u5e7e\u7a2e\u6642\u9593\u76f8\u95dc\u7684\u6578\u64da\u985e\u578b\uff0c\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>DATE<\/strong>: \u6b64\u6578\u64da\u985e\u578b\u5b58\u5132\u65e5\u671f\u548c\u6642\u9593\uff0c\u7cbe\u78ba\u5230\u79d2\u3002\u5b83\u7684\u683c\u5f0f\u70ba &#8216;YYYY-MM-DD HH24:MI:SS&#8217;\u3002<\/li>\n<li><strong>TIMESTAMP<\/strong>: \u6b64\u6578\u64da\u985e\u578b\u64f4\u5c55\u4e86 DATE \u985e\u578b\uff0c\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u7cbe\u5ea6\uff0c\u7cbe\u78ba\u5230\u5fae\u79d2\u3002\u683c\u5f0f\u70ba &#8216;YYYY-MM-DD HH24:MI:SS.FF&#8217;\u3002<\/li>\n<li><strong>INTERVAL<\/strong>: \u6b64\u6578\u64da\u985e\u578b\u7528\u65bc\u8868\u793a\u6642\u9593\u9593\u9694\uff0c\u53ef\u4ee5\u662f\u5e74\u3001\u6708\u6216\u5929\u3001\u6642\u3001\u5206\u3001\u79d2\u3002<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u53d6\u6c7a\u65bc\u61c9\u7528\u7684\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u5982\u679c\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6642\u9593\u6233\u8a18\uff0c\u5247\u61c9\u4f7f\u7528 TIMESTAMP \u985e\u578b\u3002<\/p>\n<h2 id=\"2-%e5%b8%b8%e7%94%a8%e7%9a%84%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-dBxDihrYnn\">2. \u5e38\u7528\u7684\u6642\u9593\u51fd\u6578<\/h2>\n<p>Oracle \u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u8655\u7406\u6642\u9593\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u6642\u9593\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><strong>SYSDATE<\/strong>: \u8fd4\u56de\u7576\u524d\u7684\u7cfb\u7d71\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<li><strong>CURRENT_TIMESTAMP<\/strong>: \u8fd4\u56de\u7576\u524d\u7684\u6642\u9593\u6233\uff0c\u5305\u62ec\u6642\u5340\u4fe1\u606f\u3002<\/li>\n<li><strong>EXTRACT<\/strong>: \u7528\u65bc\u5f9e\u65e5\u671f\u6216\u6642\u9593\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u90e8\u5206\uff0c\u4f8b\u5982\u5e74\u3001\u6708\u3001\u65e5\u7b49\u3002<\/li>\n<li><strong>ADD_MONTHS<\/strong>: \u5c07\u6307\u5b9a\u7684\u6708\u4efd\u6578\u6dfb\u52a0\u5230\u65e5\u671f\u4e2d\u3002<\/li>\n<li><strong>MONTHS_BETWEEN<\/strong>: \u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u6708\u4efd\u6578\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nSELECT \n    SYSDATE AS current_date,\n    CURRENT_TIMESTAMP AS current_timestamp,\n    EXTRACT(YEAR FROM SYSDATE) AS current_year,\n    ADD_MONTHS(SYSDATE, 3) AS date_after_three_months\nFROM dual;\n<\/code><\/pre>\n<h2 id=\"3-%e5%b8%b8%e8%a6%8b%e7%9a%84%e6%99%82%e9%96%93%e5%95%8f%e9%a1%8c-dBxDihrYnn\">3. \u5e38\u898b\u7684\u6642\u9593\u554f\u984c<\/h2>\n<p>\u5728\u4f7f\u7528 Oracle \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u4e00\u4e9b\u8207\u6642\u9593\u76f8\u95dc\u7684\u554f\u984c\uff1a<\/p>\n<ul>\n<li><strong>\u6642\u5340\u554f\u984c<\/strong>: \u4e0d\u540c\u7684\u7528\u6236\u53ef\u80fd\u4f4d\u65bc\u4e0d\u540c\u7684\u6642\u5340\uff0c\u9019\u53ef\u80fd\u5c0e\u81f4\u6642\u9593\u986f\u793a\u4e0d\u4e00\u81f4\u3002\u4f7f\u7528 <code>CURRENT_TIMESTAMP<\/code> \u53ef\u4ee5\u7372\u53d6\u5e36\u6709\u6642\u5340\u7684\u7576\u524d\u6642\u9593\u3002<\/li>\n<li><strong>\u590f\u4ee4\u6642\u9593<\/strong>: \u5728\u67d0\u4e9b\u5730\u5340\uff0c\u590f\u4ee4\u6642\u9593\u7684\u8b8a\u5316\u53ef\u80fd\u6703\u5f71\u97ff\u6642\u9593\u7684\u8a08\u7b97\u3002\u958b\u767c\u8005\u9700\u8981\u8003\u616e\u9019\u4e00\u9ede\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u6642\u9593\u8a08\u7b97\u6642\u3002<\/li>\n<li><strong>\u6642\u9593\u683c\u5f0f\u5316<\/strong>: \u4e0d\u540c\u7684\u61c9\u7528\u53ef\u80fd\u9700\u8981\u4e0d\u540c\u7684\u6642\u9593\u683c\u5f0f\uff0c\u958b\u767c\u8005\u9700\u8981\u4f7f\u7528 <code>TO_CHAR<\/code> \u51fd\u6578\u4f86\u683c\u5f0f\u5316\u6642\u9593\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5c07\u65e5\u671f\u683c\u5f0f\u5316\u70ba &#8216;DD-MON-YYYY&#8217; \u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nSELECT \n    TO_CHAR(SYSDATE, 'DD-MON-YYYY') AS formatted_date\nFROM dual;\n<\/code><\/pre>\n<h2 id=\"4-%e7%b5%90%e8%ab%96-dBxDihrYnn\">4. \u7d50\u8ad6<\/h2>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u6642\u9593\u7684\u8655\u7406\u662f\u4e00\u500b\u8907\u96dc\u4f46\u91cd\u8981\u7684\u8ab2\u984c\u3002\u4e86\u89e3\u4e0d\u540c\u7684\u6642\u9593\u6578\u64da\u985e\u578b\u3001\u51fd\u6578\u53ca\u5176\u6f5b\u5728\u554f\u984c\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6642\u9593\u6578\u64da\u3002\u96a8\u8457\u6280\u8853\u7684\u767c\u5c55\uff0c\u5c0d\u6642\u9593\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u7684\u9700\u6c42\u5c07\u6703\u8d8a\u4f86\u8d8a\u9ad8\uff0c\u56e0\u6b64\u638c\u63e1\u9019\u4e9b\u77e5\u8b58\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u8005\u548c\u958b\u767c\u8005\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u548c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u6578\u64da\u5eab\u4e2d\u6642\u9593\u554f\u984c\u7684\u6bd4\u8f03\uff0c\u4e86\u89e3\u4e0d\u540c\u6642\u9593\u8655\u7406\u65b9\u6cd5\u53ca\u5176\u5c0d\u6578\u64da\u6e96\u78ba\u6027\u7684\u5f71\u97ff\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-94638","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94638","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=94638"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94638\/revisions"}],"predecessor-version":[{"id":94639,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94638\/revisions\/94639"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94638"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94638"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}