{"id":95976,"date":"2024-10-20T05:34:16","date_gmt":"2024-10-19T21:34:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95976\/"},"modified":"2024-10-20T05:34:16","modified_gmt":"2024-10-19T21:34:16","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e8%99%95%e7%90%86%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95976\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u8655\u7406\u6280\u5de7"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e8%99%95%e7%90%86%e6%8a%80%e5%b7%a7-crXFNztoSg\">Oracle\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u8655\u7406\u6280\u5de7<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u64cd\u4f5c\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5b57\u7b26\u8655\u7406\u529f\u80fd\uff0c\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6587\u672c\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5728Oracle\u6578\u64da\u5eab\u4e2d\u9032\u884c\u5b57\u7b26\u8655\u7406\u7684\u6280\u5de7\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-crXFNztoSg\">\u5b57\u7b26\u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728Oracle\u4e2d\uff0c\u5b57\u7b26\u6578\u64da\u985e\u578b\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><strong>CHAR<\/strong>\uff1a\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u6700\u5927\u9577\u5ea6\u70ba2000\u5b57\u5143\u3002<\/li>\n<li><strong>VARCHAR2<\/strong>\uff1a\u53ef\u8b8a\u9577\u5ea6\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u6700\u5927\u9577\u5ea6\u70ba4000\u5b57\u5143\u3002<\/li>\n<li><strong>NCHAR<\/strong>\uff1a\u56fa\u5b9a\u9577\u5ea6\u7684\u570b\u969b\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u6700\u5927\u9577\u5ea6\u70ba2000\u5b57\u5143\u3002<\/li>\n<li><strong>NVARCHAR2<\/strong>\uff1a\u53ef\u8b8a\u9577\u5ea6\u7684\u570b\u969b\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u6700\u5927\u9577\u5ea6\u70ba4000\u5b57\u5143\u3002<\/li>\n<\/ul>\n<p>\u9078\u64c7\u5408\u9069\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6578\u64da\u5eab\u6027\u80fd\u548c\u5b58\u5132\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e8%99%95%e7%90%86%e5%87%bd%e6%95%b8-crXFNztoSg\">\u5b57\u7b26\u8655\u7406\u51fd\u6578<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u5167\u5efa\u7684\u5b57\u7b26\u8655\u7406\u51fd\u6578\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u51fd\u6578\uff1a<\/p>\n<h3 id=\"1-length-crXFNztoSg\">1. LENGTH<\/h3>\n<p>\u6b64\u51fd\u6578\u7528\u65bc\u8a08\u7b97\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002<\/p>\n<pre><code>SELECT LENGTH('Hello World') AS string_length FROM dual;<\/code><\/pre>\n<h3 id=\"2-substr-crXFNztoSg\">2. SUBSTR<\/h3>\n<p>\u6b64\u51fd\u6578\u7528\u65bc\u5f9e\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n<pre><code>SELECT SUBSTR('Oracle Database', 1, 6) AS substring FROM dual;<\/code><\/pre>\n<h3 id=\"3-instr-crXFNztoSg\">3. INSTR<\/h3>\n<p>\u6b64\u51fd\u6578\u7528\u65bc\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\u3002<\/p>\n<pre><code>SELECT INSTR('Oracle Database', 'Data') AS position FROM dual;<\/code><\/pre>\n<h3 id=\"4-replace-crXFNztoSg\">4. REPLACE<\/h3>\n<p>\u6b64\u51fd\u6578\u7528\u65bc\u66ff\u63db\u5b57\u7b26\u4e32\u4e2d\u7684\u67d0\u4e9b\u5b57\u7b26\u3002<\/p>\n<pre><code>SELECT REPLACE('Hello World', 'World', 'Oracle') AS replaced_string FROM dual;<\/code><\/pre>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e7%b7%a8%e7%a2%bc%e5%92%8c%e6%8e%92%e5%ba%8f-crXFNztoSg\">\u5b57\u7b26\u7de8\u78bc\u548c\u6392\u5e8f<\/h2>\n<p>\u5728\u8655\u7406\u591a\u8a9e\u8a00\u5b57\u7b26\u6642\uff0c\u5b57\u7b26\u7de8\u78bc\u548c\u6392\u5e8f\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002Oracle\u652f\u6301\u591a\u7a2e\u5b57\u7b26\u96c6\uff0c\u5305\u62ecUTF-8\u548cAL32UTF8\u3002\u7528\u6236\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u5b57\u7b26\u96c6\u3002<\/p>\n<p>\u5728\u9032\u884c\u6392\u5e8f\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u6307\u5b9a\u6392\u5e8f\u7684\u5b57\u7b26\u96c6\uff1a<\/p>\n<pre><code>SELECT * FROM employees ORDER BY employee_name COLLATE BINARY_CI;<\/code><\/pre>\n<h2 id=\"%e6%ad%a3%e5%89%87%e8%a1%a8%e9%81%94%e5%bc%8f-crXFNztoSg\">\u6b63\u5247\u8868\u9054\u5f0f<\/h2>\n<p>Oracle\u9084\u652f\u6301\u6b63\u5247\u8868\u9054\u5f0f\uff0c\u9019\u4f7f\u5f97\u5b57\u7b26\u8655\u7406\u66f4\u52a0\u9748\u6d3b\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u6b63\u5247\u8868\u9054\u5f0f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT REGEXP_SUBSTR('Oracle 123 Database', '[0-9]+') AS number FROM dual;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u6578\u5b57\u90e8\u5206\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-crXFNztoSg\">\u7d50\u8ad6<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u5b57\u7b26\u8655\u7406\u662f\u6578\u64da\u7ba1\u7406\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u901a\u904e\u4f7f\u7528\u5408\u9069\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\u548c\u5167\u5efa\u51fd\u6578\uff0c\u7528\u6236\u53ef\u4ee5\u6709\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6587\u672c\u6578\u64da\u3002\u7121\u8ad6\u662f\u7c21\u55ae\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\u9084\u662f\u8907\u96dc\u7684\u6b63\u5247\u8868\u9054\u5f0f\uff0cOracle\u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u652f\u6301\uff0c\u5e6b\u52a9\u7528\u6236\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728Oracle\u6578\u64da\u5eab\u4e2d\u9032\u884c\u5b57\u7b26\u8655\u7406\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u8005\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u8655\u7406\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u7c21\u5316\u5b57\u7b26\u4e32\u64cd\u4f5c\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-95976","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95976","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=95976"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95976\/revisions"}],"predecessor-version":[{"id":95977,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95976\/revisions\/95977"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}