Oracle -如何在XML标记下捕获值

Question

需要在下面的帮助。如果我想捕获特定标记的值，那么如何处理相同的值呢？例如

我想从突出显示的标记中捕获值(800.422.2762(美国和加拿大))。

<text top="89" left="611" width="177" height="11" font="1">800.422.2762 (U.S. and Canada)</text>

简而言之，每次我的程序运行时，我都想对这个标记进行硬编码，以捕获底层值。

示例XML:

 <?xml version="1.0" encoding="UTF-8"?>
<pdf2xml producer="popple`enter code here`r" version="0.51.0">
<page number="1" position="absolute" top="0" left="0" height="1188" width="918">
   <fontspec id="0" size="27" family="Helvetica" color="#000000"/>
   <fontspec id="1" size="9" family="Helvetica" color="#000000"/>
   <fontspec id="2" size="9" family="Helvetica" color="#000000"/>
   <fontspec id="3" size="9" family="Times" color="#000000"/>
   <fontspec id="4" size="12" family="Helvetica" color="#000000"/>
   <fontspec id="5" size="12" family="Helvetica" color="#000000"/>
   <fontspec id="6" size="9" family="Helvetica" color="#000000"/>
<image top="27" left="54" width="203" height="108" src="ext-resources\bin\asdf-1_1.jpg"/>
<text top="103" left="346" width="123" height="28" font="0"><b>INVOICE</b></text>
<text top="75" left="611" width="211" height="11" font="1">+1 913.217.6000, Fax +1 913.341.3742</text>
<text top="89" left="611" width="177" height="11" font="1">800.422.2762 (U.S. and Canada)</text>
<text top="102" left="611" width="230" height="11" font="1">headquarters@armaintl.org, www.arma.org</text>
<text top="32" left="611" width="104" height="11" font="1">ARMA International</text>
</page>
</pdf2xml>

到目前为止，我已经尝试了以下方法，成功地提取了数据，但是我想要提取一个基于硬编码标记的特定值。请帮忙解决这个问题。

WITH data
     AS (SELECT xmltype (
                   '<?xml version="1.0" encoding="UTF-8"?>
<pdf2xml producer="popple`enter code here`r" version="0.51.0">
<page number="1" position="absolute" top="0" left="0" height="1188" width="918">
   <fontspec id="0" size="27" family="Helvetica" color="#000000"/>
   <fontspec id="1" size="9" family="Helvetica" color="#000000"/>
   <fontspec id="2" size="9" family="Helvetica" color="#000000"/>
   <fontspec id="3" size="9" family="Times" color="#000000"/>
   <fontspec id="4" size="12" family="Helvetica" color="#000000"/>
   <fontspec id="5" size="12" family="Helvetica" color="#000000"/>
   <fontspec id="6" size="9" family="Helvetica" color="#000000"/>
<image top="27" left="54" width="203" height="108" src="ext-resources\bin\asdf-1_1.jpg"/>
<text top="103" left="346" width="123" height="28" font="0"><b>INVOICE</b></text>
<text top="75" left="611" width="211" height="11" font="1">+1 913.217.6000, Fax +1 913.341.3742</text>
<text top="89" left="611" width="177" height="11" font="1">800.422.2762 (U.S. and Canada)</text>
<text top="102" left="611" width="230" height="11" font="1">headquarters@armaintl.org, www.arma.org</text>
<text top="32" left="611" width="104" height="11" font="1">ARMA International</text>
</page>
</pdf2xml>')
                   xmldoc
           FROM DUAL)
SELECT x.*
  FROM data,
       XMLTABLE ('/pdf2xml/page/text'
                 PASSING xmldoc
                 COLUMNS text VARCHAR2 (50) PATH '/text') x
/

输出：

TEXT
--------------------------------------------------
INVOICE
+1 913.217.6000, Fax +1 913.341.3742
800.422.2762 (U.S. and Canada)
headquarters@armaintl.org, www.arma.org
ARMA International

Answer 1

如果您只有一个源文档，并且只需要一个节点值，则可以使用XMLQuery而不是XMLTable，在@wolφi的XPath上略有变化：

select XMLQuery('/pdf2xml/page/text[@top=89]/text()'
  passing xmldoc
  returning content) as text
from data;

为您提供一个XML片段，或者

select XMLQuery('/pdf2xml/page/text[@top=89]/text()'
  passing xmldoc
  returning content).getStringVal() as text
from data;

这给了你一个字符串：

TEXT                          
------------------------------
800.422.2762 (U.S. and Canada)

当然，如果您确实有多个文档或节点，那么XMLTable就是最好的选择。

Answer 2

只需将XQuery改为

'/pdf2xml/page/text'

至

'/pdf2xml/page/text[@top=89]'

结果将是

800.422.2762 (U.S. and Canada)

Answer 3

或将查询更改为：

SELECT x.*
FROM data,
   XMLTABLE ('/pdf2xml/page/text'
             PASSING xmldoc
             COLUMNS 
             text VARCHAR2 (50) PATH '/text',
             top  number        PATH '@top',
             left  number       PATH '@left',
             width  number      PATH '@width',
             height  number     PATH '@height',
             font    number     PATH '@font'
             ) x
where x.top = 89
and x.left = 611
and x.width = 177
and x.height = 11
and x.font = 1;