{"id":96162,"date":"2024-10-20T07:07:16","date_gmt":"2024-10-19T23:07:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96162\/"},"modified":"2024-10-20T07:07:17","modified_gmt":"2024-10-19T23:07:17","slug":"oracle%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b%e9%82%a3%e7%94%a8%e5%88%b0%e7%9a%84%e6%ad%a5%e9%a9%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96162\/","title":{"rendered":"Oracle\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u90a3\u7528\u5230\u7684\u6b65\u9a5f"},"content":{"rendered":"<h1 id=\"oracle%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b%e7%9a%84%e6%ad%a5%e9%a9%9f-fwNDckDlQx\">Oracle\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u7684\u6b65\u9a5f<\/h1>\n<p>\u5728\u4f7f\u7528Oracle\u6578\u64da\u5eab\u6642\uff0c\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u9019\u53ef\u80fd\u662f\u56e0\u70ba\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u66f4\uff0c\u6216\u8005\u662f\u70ba\u4e86\u63d0\u9ad8\u6578\u64da\u7684\u5b58\u5132\u6548\u7387\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5728Oracle\u4e2d\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u7684\u6b65\u9a5f\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%80%ef%bc%9a%e6%aa%a2%e6%9f%a5%e7%95%b6%e5%89%8d%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b-fwNDckDlQx\">\u6b65\u9a5f\u4e00\uff1a\u6aa2\u67e5\u7576\u524d\u5b57\u6bb5\u985e\u578b<\/h2>\n<p>\u5728\u9032\u884c\u4efb\u4f55\u4fee\u6539\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u78ba\u8a8d\u7576\u524d\u5b57\u6bb5\u7684\u985e\u578b\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\u4f86\u6aa2\u67e5\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, data_length \nFROM user_tab_columns \nWHERE table_name = '\u4f60\u7684\u8868\u540d';<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u7372\u5f97\u6307\u5b9a\u8868\u4e2d\u6240\u6709\u5b57\u6bb5\u7684\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u53ca\u5176\u9577\u5ea6\u3002<\/p>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e4%ba%8c%ef%bc%9a%e7%a2%ba%e5%ae%9a%e6%96%b0%e7%9a%84%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b-fwNDckDlQx\">\u6b65\u9a5f\u4e8c\uff1a\u78ba\u5b9a\u65b0\u7684\u5b57\u6bb5\u985e\u578b<\/h2>\n<p>\u5728\u78ba\u5b9a\u8981\u4fee\u6539\u7684\u5b57\u6bb5\u5f8c\uff0c\u63a5\u4e0b\u4f86\u9700\u8981\u6c7a\u5b9a\u65b0\u7684\u6578\u64da\u985e\u578b\u3002Oracle\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>VARCHAR2<\/strong>\uff1a\u53ef\u8b8a\u9577\u5ea6\u5b57\u7b26\u4e32<\/li>\n<li><strong>NUMBER<\/strong>\uff1a\u6578\u5b57\u985e\u578b<\/li>\n<li><strong>DATE<\/strong>\uff1a\u65e5\u671f\u985e\u578b<\/li>\n<li><strong>CLOB<\/strong>\uff1a\u5b57\u7b26\u5927\u5c0d\u8c61<\/li>\n<\/ul>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u56e0\u70ba\u9019\u5c07\u5f71\u97ff\u6578\u64da\u7684\u5b58\u5132\u548c\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8alter-table%e5%91%bd%e4%bb%a4%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b-fwNDckDlQx\">\u6b65\u9a5f\u4e09\uff1a\u4f7f\u7528ALTER TABLE\u547d\u4ee4\u4fee\u6539\u5b57\u6bb5\u985e\u578b<\/h2>\n<p>\u5728\u78ba\u5b9a\u4e86\u65b0\u7684\u5b57\u6bb5\u985e\u578b\u5f8c\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u547d\u4ee4\u4f86\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u4f60\u7684\u8868\u540d \nMODIFY (\u5b57\u6bb5\u540d \u65b0\u7684\u6578\u64da\u985e\u578b);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u8981\u5c07\u540d\u70ba\u201cusername\u201d\u7684\u5b57\u6bb5\u5f9eVARCHAR2(50)\u4fee\u6539\u70baVARCHAR2(100)\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>ALTER TABLE users \nMODIFY (username VARCHAR2(100));<\/code><\/pre>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e5%9b%9b%ef%bc%9a%e8%99%95%e7%90%86%e6%95%b8%e6%93%9a%e9%81%b7%e7%a7%bb-fwNDckDlQx\">\u6b65\u9a5f\u56db\uff1a\u8655\u7406\u6578\u64da\u9077\u79fb<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u6216\u4e0d\u517c\u5bb9\u3002\u56e0\u6b64\uff0c\u5728\u57f7\u884c\u4fee\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u5099\u4efd\u8868\uff1a<\/p>\n<pre><code>CREATE TABLE users_backup AS \nSELECT * FROM users;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u4fee\u6539\u904e\u7a0b\u4e2d\uff0c\u5982\u679c\u51fa\u73fe\u554f\u984c\uff0c\u53ef\u4ee5\u96a8\u6642\u6062\u5fa9\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e4%ba%94%ef%bc%9a%e9%a9%97%e8%ad%89%e4%bf%ae%e6%94%b9%e7%b5%90%e6%9e%9c-fwNDckDlQx\">\u6b65\u9a5f\u4e94\uff1a\u9a57\u8b49\u4fee\u6539\u7d50\u679c<\/h2>\n<p>\u5b8c\u6210\u5b57\u6bb5\u985e\u578b\u7684\u4fee\u6539\u5f8c\uff0c\u61c9\u8a72\u518d\u6b21\u6aa2\u67e5\u8868\u7d50\u69cb\uff0c\u4ee5\u78ba\u4fdd\u4fee\u6539\u5df2\u6210\u529f\u61c9\u7528\u3002\u53ef\u4ee5\u4f7f\u7528\u8207\u6b65\u9a5f\u4e00\u76f8\u540c\u7684\u67e5\u8a62\u4f86\u9a57\u8b49\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, data_length \nFROM user_tab_columns \nWHERE table_name = '\u4f60\u7684\u8868\u540d';<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-fwNDckDlQx\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u4e4b\u524d\uff0c\u52d9\u5fc5\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li>\u78ba\u4fdd\u65b0\u7684\u6578\u64da\u985e\u578b\u80fd\u5920\u5bb9\u7d0d\u73fe\u6709\u6578\u64da\uff0c\u907f\u514d\u56e0\u6578\u64da\u4e0d\u517c\u5bb9\u800c\u5c0e\u81f4\u7684\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u9032\u884c\u4fee\u6539\u6642\uff0c\u5efa\u8b70\u5728\u4f4e\u5cf0\u671f\u9032\u884c\uff0c\u4ee5\u6e1b\u5c11\u5c0d\u696d\u52d9\u7684\u5f71\u97ff\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fwNDckDlQx\">\u7e3d\u7d50<\/h2>\n<p>\u4fee\u6539Oracle\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u6bb5\u985e\u578b\u662f\u4e00\u500b\u76f8\u5c0d\u7c21\u55ae\u7684\u904e\u7a0b\uff0c\u4f46\u9700\u8981\u8b39\u614e\u64cd\u4f5c\u3002\u901a\u904e\u9075\u5faa\u4e0a\u8ff0\u6b65\u9a5f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5b8c\u6210\u5b57\u6bb5\u985e\u578b\u7684\u4fee\u6539\uff0c\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u66f4\u591a\u6709\u95dc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u652f\u6301\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u670d\u52d9\u3002 <\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u7684\u6b65\u9a5f\uff0c\u5305\u62ec\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u548c\u6ce8\u610f\u4e8b\u9805\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u8207\u517c\u5bb9\u6027\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-96162","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96162","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=96162"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96162\/revisions"}],"predecessor-version":[{"id":96163,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96162\/revisions\/96163"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}