{"id":92812,"date":"2024-10-19T08:43:17","date_gmt":"2024-10-19T00:43:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/92812\/"},"modified":"2024-10-19T08:43:17","modified_gmt":"2024-10-19T00:43:17","slug":"ora-44912-%e7%84%a1%e6%95%88%e6%88%96%e4%b8%8d%e6%94%af%e6%8c%81%e7%9a%84-xpath-%e8%a1%a8%e9%81%94%e5%bc%8f-string-oracle-%e5%a0%b1%e9%8c%af-%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9-%e9%81%a0%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/92812\/","title":{"rendered":"ORA-44912: \u7121\u6548\u6216\u4e0d\u652f\u6301\u7684 xpath \u8868\u9054\u5f0f string ORACLE \u5831\u932f \u6545\u969c\u4fee\u5fa9 \u9060\u7a0b\u8655\u7406"},"content":{"rendered":"<h1 id=\"ora-44912-%e7%84%a1%e6%95%88%e6%88%96%e4%b8%8d%e6%94%af%e6%8c%81%e7%9a%84-xpath-%e8%a1%a8%e9%81%94%e5%bc%8f%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9-akylpcJHDk\">ORA-44912: \u7121\u6548\u6216\u4e0d\u652f\u6301\u7684 XPath \u8868\u9054\u5f0f\u6545\u969c\u4fee\u5fa9<\/h1>\n<p>\u5728\u4f7f\u7528 Oracle \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f <code>ORA-44912<\/code>\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u8207 XPath \u8868\u9054\u5f0f\u7684\u4f7f\u7528\u6709\u95dc\uff0c\u7279\u5225\u662f\u5728\u8655\u7406 XML \u6578\u64da\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e <code>ORA-44912<\/code> \u932f\u8aa4\u7684\u539f\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u9032\u884c\u6545\u969c\u4fee\u5fa9\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-ora-44912-%e9%8c%af%e8%aa%a4%ef%bc%9f-akylpcJHDk\">\u4ec0\u9ebc\u662f ORA-44912 \u932f\u8aa4\uff1f<\/h2>\n<p><code>ORA-44912<\/code> \u932f\u8aa4\u8868\u793a\u6240\u63d0\u4f9b\u7684 XPath \u8868\u9054\u5f0f\u7121\u6548\u6216\u4e0d\u88ab\u652f\u6301\u3002XPath \u662f\u4e00\u7a2e\u7528\u65bc\u5728 XML \u6587\u6a94\u4e2d\u67e5\u8a62\u548c\u9078\u64c7\u7bc0\u9ede\u7684\u8a9e\u8a00\uff0c\u7576\u958b\u767c\u8005\u5617\u8a66\u4f7f\u7528\u4e0d\u6b63\u78ba\u7684 XPath \u8868\u9054\u5f0f\u6642\uff0c\u4fbf\u6703\u89f8\u767c\u6b64\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e5%8e%9f%e5%9b%a0-akylpcJHDk\">\u5e38\u898b\u539f\u56e0<\/h2>\n<ul>\n<li><strong>\u8a9e\u6cd5\u932f\u8aa4\uff1a<\/strong> XPath \u8868\u9054\u5f0f\u7684\u8a9e\u6cd5\u4e0d\u6b63\u78ba\uff0c\u53ef\u80fd\u662f\u56e0\u70ba\u7f3a\u5c11\u5fc5\u8981\u7684\u7b26\u865f\u6216\u4f7f\u7528\u4e86\u4e0d\u652f\u6301\u7684\u51fd\u6578\u3002<\/li>\n<li><strong>\u4e0d\u652f\u6301\u7684\u529f\u80fd\uff1a<\/strong> \u67d0\u4e9b XPath \u529f\u80fd\u5728\u7279\u5b9a\u7248\u672c\u7684 Oracle \u4e2d\u53ef\u80fd\u4e0d\u88ab\u652f\u6301\uff0c\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li><strong>\u6578\u64da\u683c\u5f0f\u554f\u984c\uff1a<\/strong> XML \u6578\u64da\u7684\u7d50\u69cb\u53ef\u80fd\u8207 XPath \u8868\u9054\u5f0f\u4e0d\u5339\u914d\uff0c\u5c0e\u81f4\u67e5\u8a62\u5931\u6557\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-ora-44912-%e9%8c%af%e8%aa%a4-akylpcJHDk\">\u5982\u4f55\u4fee\u5fa9 ORA-44912 \u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9 <code>ORA-44912<\/code> \u932f\u8aa4\u7684\u904e\u7a0b\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5-xpath-%e8%a1%a8%e9%81%94%e5%bc%8f-akylpcJHDk\">1. \u6aa2\u67e5 XPath \u8868\u9054\u5f0f<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u60a8\u4f7f\u7528\u7684 XPath \u8868\u9054\u5f0f\u662f\u5426\u6b63\u78ba\u3002\u78ba\u4fdd\u8a9e\u6cd5\u7121\u8aa4\uff0c\u4e26\u4e14\u4f7f\u7528\u7684\u51fd\u6578\u5728\u60a8\u7684 Oracle \u7248\u672c\u4e2d\u662f\u88ab\u652f\u6301\u7684\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u662f\u4e00\u500b\u6b63\u78ba\u7684 XPath \u8868\u9054\u5f0f\uff1a<\/p>\n<pre><code>SELECT EXTRACTVALUE(xml_column, '\/root\/element') FROM your_table;<\/code><\/pre>\n<h3 id=\"2-%e9%a9%97%e8%ad%89-xml-%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b-akylpcJHDk\">2. \u9a57\u8b49 XML \u6578\u64da\u7d50\u69cb<\/h3>\n<p>\u78ba\u4fdd XML \u6578\u64da\u7684\u7d50\u69cb\u8207 XPath \u8868\u9054\u5f0f\u76f8\u7b26\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u6aa2\u67e5 XML \u6578\u64da\uff1a<\/p>\n<pre><code>SELECT xml_column FROM your_table WHERE ROWNUM = 1;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u5e6b\u52a9\u60a8\u78ba\u8a8d XML \u7684\u6839\u5143\u7d20\u548c\u5b50\u5143\u7d20\u662f\u5426\u5b58\u5728\u3002<\/p>\n<h3 id=\"3-%e6%9b%b4%e6%96%b0-oracle-%e7%89%88%e6%9c%ac-akylpcJHDk\">3. \u66f4\u65b0 Oracle \u7248\u672c<\/h3>\n<p>\u5982\u679c\u60a8\u767c\u73fe\u67d0\u4e9b XPath \u529f\u80fd\u5728\u7576\u524d\u7248\u672c\u4e2d\u4e0d\u88ab\u652f\u6301\uff0c\u8003\u616e\u5347\u7d1a\u5230\u6700\u65b0\u7248\u672c\u7684 Oracle \u6578\u64da\u5eab\u3002\u65b0\u7248\u672c\u901a\u5e38\u6703\u4fee\u5fa9\u820a\u7248\u672c\u4e2d\u7684\u554f\u984c\u4e26\u589e\u52a0\u5c0d\u65b0\u529f\u80fd\u7684\u652f\u6301\u3002<\/p>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e6%9b%bf%e4%bb%a3%e6%96%b9%e6%b3%95-akylpcJHDk\">4. \u4f7f\u7528\u66ff\u4ee3\u65b9\u6cd5<\/h3>\n<p>\u5982\u679c XPath \u8868\u9054\u5f0f\u7121\u6cd5\u6b63\u5e38\u5de5\u4f5c\uff0c\u8003\u616e\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\u4f86\u67e5\u8a62 XML \u6578\u64da\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>XMLTABLE<\/code> \u51fd\u6578\u4f86\u89e3\u6790 XML \u6578\u64da\uff1a<\/p>\n<pre><code>SELECT * FROM XMLTABLE('\/root\/element' PASSING xml_column COLUMNS column_name VARCHAR2(100) PATH 'subelement');<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-akylpcJHDk\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u8655\u7406 Oracle \u6578\u64da\u5eab\u4e2d\u7684 XML \u6578\u64da\u6642\uff0c<code>ORA-44912<\/code> \u932f\u8aa4\u53ef\u80fd\u6703\u5f71\u97ff\u958b\u767c\u8005\u7684\u5de5\u4f5c\u6548\u7387\u3002\u901a\u904e\u6aa2\u67e5 XPath \u8868\u9054\u5f0f\u3001\u9a57\u8b49 XML \u6578\u64da\u7d50\u69cb\u3001\u66f4\u65b0 Oracle \u7248\u672c\u4ee5\u53ca\u4f7f\u7528\u66ff\u4ee3\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u6b64\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u5728\u9ad8\u8ca0\u8f09\u4e0b\u4ecd\u80fd\u6b63\u5e38\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u89e3\u6c7a ORA-44912 \u932f\u8aa4\uff1a\u7121\u6548\u6216\u4e0d\u652f\u6301\u7684 XPath \u8868\u9054\u5f0f\u3002\u63d0\u4f9b\u6545\u969c\u4fee\u5fa9\u548c\u9060\u7a0b\u8655\u7406\u6307\u5357\uff0c\u52a9\u60a8\u5feb\u901f\u6062\u5fa9\u7cfb\u7d71\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-92812","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/92812","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=92812"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/92812\/revisions"}],"predecessor-version":[{"id":92813,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/92812\/revisions\/92813"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=92812"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=92812"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=92812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}