{"id":298,"date":"2024-12-16T16:32:07","date_gmt":"2024-12-16T08:32:07","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=298"},"modified":"2024-12-16T16:32:07","modified_gmt":"2024-12-16T08:32:07","slug":"oracle%e6%80%8e%e4%b9%88%e5%b0%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e6%97%a5%e6%9c%9f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2024\/12\/16\/oracle%e6%80%8e%e4%b9%88%e5%b0%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e6%97%a5%e6%9c%9f%ef%bc%9f\/","title":{"rendered":"oracle\u600e\u4e48\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\uff1f"},"content":{"rendered":"\n
\n

\u5728Oracle\u4e2d\uff0c\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u901a\u5e38\u4f7f\u7528 TO_DATE<\/code> \u51fd\u6570\u3002TO_DATE<\/code> \u51fd\u6570\u80fd\u591f\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\uff08\u7b26\u5408\u7279\u5b9a\u683c\u5f0f\uff09\u8f6c\u6362\u4e3a DATE<\/code> \u6570\u636e\u7c7b\u578b\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<\/blockquote>\n\n\n\n

1. TO_DATE<\/code> \u51fd\u6570\u7684\u57fa\u672c\u8bed\u6cd5<\/h3>\n\n\n\n
TO_DATE('string', 'format')<\/code><\/pre>\n\n\n\n
    \n
  • string<\/code>\uff1a\u5f85\u8f6c\u6362\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n\n\n\n
  • format<\/code>\uff1a\u6307\u5b9a\u5b57\u7b26\u4e32\u7684\u65e5\u671f\u683c\u5f0f\u3002\u8fd9\u4e2a\u683c\u5f0f\u5fc5\u987b\u4e0e\u5b57\u7b26\u4e32\u7684\u5b9e\u9645\u683c\u5f0f\u76f8\u5339\u914d\u3002<\/li>\n<\/ul>\n\n\n\n
    2. \u5e38\u89c1\u7684\u65e5\u671f\u683c\u5f0f<\/h3>\n\n\n\n
    Oracle\u652f\u6301\u591a\u79cd\u683c\u5f0f\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u683c\u5f0f\u5316\u5b57\u7b26\uff1a<\/p>\n\n\n\n
      \n
    • YYYY<\/code> \u6216 RRRR<\/code>\uff1a\u56db\u4f4d\u6570\u7684\u5e74\u4efd\u3002<\/li>\n\n\n\n
    • MM<\/code>\uff1a\u4e24\u4f4d\u6570\u7684\u6708\u4efd\uff0801\u523012\uff09\u3002<\/li>\n\n\n\n
    • DD<\/code>\uff1a\u4e24\u4f4d\u6570\u7684\u65e5\u671f\uff0801\u523031\uff09\u3002<\/li>\n\n\n\n
    • HH<\/code> \u6216 HH24<\/code>\uff1a\u5c0f\u65f6\uff0812\u5c0f\u65f6\u621624\u5c0f\u65f6\u5236\uff09\u3002<\/li>\n\n\n\n
    • MI<\/code>\uff1a\u5206\u949f\uff0800\u523059\uff09\u3002<\/li>\n\n\n\n
    • SS<\/code>\uff1a\u79d2\u949f\uff0800\u523059\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
      3. \u793a\u4f8b\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f<\/h3>\n\n\n\n
      \u793a\u4f8b 1\uff1a\u5b57\u7b26\u4e32\u683c\u5f0f\u4e3a 'YYYY-MM-DD'<\/code><\/h4>\n\n\n\n
      \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32 '2024-12-16'<\/code>\uff0c\u5e76\u4e14\u60f3\u5c06\u5176\u8f6c\u6362\u4e3a\u65e5\u671f\u7c7b\u578b\uff1a<\/p>\n\n\n\n
      SELECT TO_DATE('2024-12-16', 'YYYY-MM-DD') AS converted_date FROM dual;<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      CONVERTED_DATE\n-----------------\n16-DEC-24<\/code><\/pre>\n\n\n\n
      \u793a\u4f8b 2\uff1a\u5b57\u7b26\u4e32\u683c\u5f0f\u4e3a 'DD\/MM\/YYYY'<\/code><\/h4>\n\n\n\n
      \u5982\u679c\u5b57\u7b26\u4e32\u683c\u5f0f\u662f '16\/12\/2024'<\/code>\uff0c\u5219\u53ef\u4ee5\u8fd9\u6837\u8f6c\u6362\uff1a<\/p>\n\n\n\n
      SELECT TO_DATE('16\/12\/2024', 'DD\/MM\/YYYY') AS converted_date FROM dual;<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      CONVERTED_DATE\n-----------------\n16-DEC-24<\/code><\/pre>\n\n\n\n
      \u793a\u4f8b 3\uff1a\u5305\u542b\u65f6\u95f4\u7684\u5b57\u7b26\u4e32<\/h4>\n\n\n\n
      \u5982\u679c\u5b57\u7b26\u4e32\u5305\u542b\u65f6\u95f4\u4fe1\u606f\uff0c\u4f8b\u5982 '2024-12-16 14:30:00'<\/code>\uff0c\u5219\u9700\u8981\u5728\u683c\u5f0f\u4e2d\u6307\u5b9a\u65f6\u95f4\u90e8\u5206\uff1a<\/p>\n\n\n\n
      SELECT TO_DATE('2024-12-16 14:30:00', 'YYYY-MM-DD HH24:MI:SS') AS converted_date FROM dual;<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      CONVERTED_DATE\n-------------------------------\n16-DEC-24 02:30:00 PM<\/code><\/pre>\n\n\n\n
      \u793a\u4f8b 4\uff1a\u5305\u542b AM\/PM \u7684\u65f6\u95f4\u683c\u5f0f<\/h4>\n\n\n\n
      \u5982\u679c\u65f6\u95f4\u662f12\u5c0f\u65f6\u5236\uff0c\u5e76\u4e14\u5e26\u6709 AM\/PM<\/code>\uff0c\u4f8b\u5982 '16\/12\/2024 02:30:00 PM'<\/code>\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u683c\u5f0f\uff1a<\/p>\n\n\n\n
      SELECT TO_DATE('16\/12\/2024 02:30:00 PM', 'DD\/MM\/YYYY HH12:MI:SS AM') AS converted_date FROM dual;<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      CONVERTED_DATE\n-------------------------------\n16-DEC-24 02:30:00 PM<\/code><\/pre>\n\n\n\n
      4. \u683c\u5f0f\u5316\u53c2\u6570\u8be6\u7ec6\u8bf4\u660e<\/h3>\n\n\n\n
      \u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u683c\u5f0f\u5316\u53c2\u6570\uff0c\u5e2e\u52a9\u4f60\u66f4\u7075\u6d3b\u5730\u5904\u7406\u4e0d\u540c\u683c\u5f0f\u7684\u65e5\u671f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n
      \u683c\u5f0f<\/th>\u8bf4\u660e<\/th><\/tr><\/thead>
      YYYY<\/code><\/td>4\u4f4d\u6570\u7684\u5e74\u4efd<\/td><\/tr>
      MM<\/code><\/td>\u6708\u4efd\uff0801\u523012\uff09<\/td><\/tr>
      DD<\/code><\/td>\u65e5\u671f\uff0801\u523031\uff09<\/td><\/tr>
      HH<\/code> \u6216 HH12<\/code><\/td>12\u5c0f\u65f6\u5236\u7684\u5c0f\u65f6\uff0801\u523012\uff09<\/td><\/tr>
      HH24<\/code><\/td>24\u5c0f\u65f6\u5236\u7684\u5c0f\u65f6\uff0800\u523023\uff09<\/td><\/tr>
      MI<\/code><\/td>\u5206\u949f\uff0800\u523059\uff09<\/td><\/tr>
      SS<\/code><\/td>\u79d2\u949f\uff0800\u523059\uff09<\/td><\/tr>
      AM<\/code> \u6216 PM<\/code><\/td>\u4e0a\u5348\u6216\u4e0b\u5348\uff08\u9002\u7528\u4e8e12\u5c0f\u65f6\u5236\uff09<\/td><\/tr>
      D<\/code><\/td>\u661f\u671f\u51e0\u7684\u6570\u5b57\uff081\u8868\u793a\u661f\u671f\u65e5\uff0c2\u8868\u793a\u661f\u671f\u4e00\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff09<\/td><\/tr>
      MON<\/code><\/td>\u6708\u4efd\u7684\u7f29\u5199\uff08\u4f8b\u5982\uff1aJAN\u3001FEB\uff09<\/td><\/tr>
      MONTH<\/code><\/td>\u6708\u4efd\u7684\u5168\u540d\uff08\u4f8b\u5982\uff1aJANUARY\u3001FEBRUARY\uff09<\/td><\/tr>
      YYYY<\/code><\/td>\u56db\u4f4d\u6570\u5e74\u4efd\uff0c\u4f8b\u5982\uff1a2024<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      5. \u5904\u7406\u4e0d\u5339\u914d\u7684\u65e5\u671f\u683c\u5f0f<\/h3>\n\n\n\n
      \u5982\u679c\u8f93\u5165\u7684\u65e5\u671f\u5b57\u7b26\u4e32\u4e0e\u6307\u5b9a\u7684\u683c\u5f0f\u4e0d\u5339\u914d\uff0cOracle\u4f1a\u629b\u51fa ORA-01843: not a valid month<\/code> \u9519\u8bef\u3002\u4f8b\u5982\uff0c\u5c1d\u8bd5\u5c06\u5b57\u7b26\u4e32 '2024-13-32'<\/code> \u8f6c\u6362\u4e3a\u65e5\u671f\u65f6\uff0cOracle\u4f1a\u56e0\u4e3a\u65e5\u671f\u4e2d\u7684\u201c13\u201d\u548c\u201c32\u201d\u4e0d\u5408\u6cd5\u800c\u62a5\u9519\u3002<\/p>\n\n\n\n
      6. \u81ea\u52a8\u8f6c\u6362\u65e5\u671f\u683c\u5f0f<\/h3>\n\n\n\n
      \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cOracle\u4f1a\u5c1d\u8bd5\u81ea\u52a8\u63a8\u65ad\u65e5\u671f\u683c\u5f0f\uff0c\u4f46\u4e3a\u4e86\u786e\u4fdd\u51c6\u786e\u6027\uff0c\u6700\u597d\u660e\u786e\u6307\u5b9a\u683c\u5f0f\u3002Oracle\u4f1a\u57fa\u4e8e\u5f53\u524d NLS_DATE_FORMAT<\/code> \u8bbe\u7f6e\u6765\u8fdb\u884c\u65e5\u671f\u683c\u5f0f\u7684\u81ea\u52a8\u8f6c\u6362\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u67e5\u8be2 NLS_DATE_FORMAT<\/code> \u6765\u67e5\u770b\u5f53\u524d\u9ed8\u8ba4\u65e5\u671f\u683c\u5f0f\uff1a<\/p>\n\n\n\n
      SELECT value FROM v$nls_parameters WHERE parameter = 'NLS_DATE_FORMAT';<\/code><\/pre>\n\n\n\n
      \u5982\u679c\u4f60\u5e0c\u671b\u4fee\u6539\u4f1a\u8bdd\u7684\u65e5\u671f\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n\n\n\n
      ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';<\/code><\/pre>\n\n\n\n
      7. \u4f7f\u7528 TO_TIMESTAMP<\/code> \u5904\u7406\u65f6\u95f4\u6233<\/h3>\n\n\n\n
      \u5982\u679c\u4f60\u9700\u8981\u5904\u7406\u66f4\u7cbe\u786e\u7684\u65f6\u95f4\uff08\u5305\u62ec\u6beb\u79d2\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528 TO_TIMESTAMP<\/code>\uff0c\u5b83\u53ef\u4ee5\u5904\u7406\u65f6\u95f4\u6233\uff08TIMESTAMP<\/code> \u6570\u636e\u7c7b\u578b\uff09\u3002<\/p>\n\n\n\n
      SELECT TO_TIMESTAMP('2024-12-16 14:30:00.123456', 'YYYY-MM-DD HH24:MI:SS.FF') AS converted_timestamp FROM dual;<\/code><\/pre>\n\n\n\n
      \u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u5e26\u6709\u5fae\u79d2\u7cbe\u5ea6\u7684\u65f6\u95f4\u6233\u3002<\/p>\n\n\n\n
      8. \u5904\u7406\u4e0d\u540c\u8bed\u8a00\u7684\u65e5\u671f\u683c\u5f0f<\/h3>\n\n\n\n
      Oracle\u4e5f\u652f\u6301\u672c\u5730\u5316\u7684\u65e5\u671f\u683c\u5f0f\uff0c\u4f8b\u5982\u5728\u4e0d\u540c\u8bed\u8a00\u73af\u5883\u4e0b\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u4e0d\u540c\u7684\u6708\u4efd\u540d\u79f0\u6216\u65e5\u671f\u683c\u5f0f\u3002\u53ef\u4ee5\u4f7f\u7528 TO_DATE<\/code> \u548c\u672c\u5730\u5316\u65e5\u671f\u683c\u5f0f\u6765\u8fdb\u884c\u8f6c\u6362\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n
      SELECT TO_DATE('16 D\u00e9c 2024', 'DD MON YYYY', 'NLS_DATE_LANGUAGE=FRENCH') AS converted_date FROM dual;<\/code><\/pre>\n\n\n\n
      \u603b\u7ed3<\/h3>\n\n\n\n
      \u901a\u8fc7 TO_DATE<\/code> \u51fd\u6570\uff0c\u4f60\u53ef\u4ee5\u5c06\u4e0d\u540c\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u7c7b\u578b\u3002\u786e\u4fdd\u63d0\u4f9b\u7684\u683c\u5f0f\u4e0e\u5b57\u7b26\u4e32\u7684\u5b9e\u9645\u683c\u5f0f\u5339\u914d\uff0c\u80fd\u591f\u907f\u514d\u9519\u8bef\u7684\u8f6c\u6362\u3002\u7406\u89e3\u548c\u4f7f\u7528\u65e5\u671f\u683c\u5f0f\u5316\u7b26\u53f7\u6709\u52a9\u4e8e\u66f4\u597d\u5730\u5904\u7406\u65e5\u671f\u5b57\u7b26\u4e32\u7684\u8f6c\u6362\u3002<\/p>\n\n\n\n
      \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u5728Oracle\u4e2d\uff0c\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u901a\u5e38\u4f7f\u7528 TO_DATE \u51fd\u6570\u3002TO_DATE \u51fd\u6570\u80fd\u591f\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\uff08\u7b26\u5408 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[69],"tags":[],"class_list":["post-298","post","type-post","status-publish","format-standard","hentry","category-oracle"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/298","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=298"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/298\/revisions"}],"predecessor-version":[{"id":299,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/298\/revisions\/299"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=298"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=298"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}