使用 XQuery 将 XML 转换为 CSV

Question

我有一个 XML 文件，我需要将它转换成 XQuery。考虑一组简单的 XML：

books[book]
book[@isbn, title, descrption]

例如：

<books>
    <book isbn="1590593049">
        <title>Extending Flash MX 2004</title>
        <description>
        Using javascript alongwith actionscript 3.0 and mxml.</description>
    </book>
    <book isbn="0132149184">
        <title>Java Software Solutions</title>
        <description>
            Complete book full of case studies on business solutions and design concepts while building mission critical
            business applications.
        </description>
    </book>

如何使用 XQuery 将其转换为 CSV 格式？ CSV 被 Microsoft excel 使用，

所以它会用逗号（，）字符分隔，特殊字符应该转义。

Answer 1

纯 XPath 2.0 表达式：

for $b in /*/book
    return
      concat(escape-html-uri(string-join(($b/@isbn,
                                          $b/title,
                                          $b/description
                                          )
                                           /normalize-space(),
                                        ",")
                             ),
             codepoints-to-string(10))

基于 XSLT 2 的验证：

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:template match="/">
  <xsl:sequence select=
   "for $b in /*/book
       return
         concat(escape-html-uri(string-join(($b/@isbn,
                                             $b/title,
                                             $b/description
                                             )
                                              /normalize-space(),
                                           ',')
                                ),
                codepoints-to-string(10))"/>
 </xsl:template>
</xsl:stylesheet>

当此转换应用于所提供的 XML 文档时（已纠正其格式错误）：

<books>
    <book isbn="1590593049">
        <title>Extending Flash MX 2004</title>
        <description>
        Using javascript alongwith actionscript 3.0 and mxml.</description>
    </book>
    <book isbn="0132149184">
        <title>Java Software Solutions</title>
        <description>
            Complete book full of case studies on business solutions and design concepts while building mission critical
            business applications.
        </description>
    </book>
</books>

产生想要的正确结果：

1590593049,Extending Flash MX 2004,Using javascript alongwith actionscript 3.0 and mxml.
 0132149184,Java Software Solutions,Complete book full of case studies on business solutions and design concepts while building mission critical business applications.

更新：

在评论中，OP 要求任何文本中的逗号都用引号括起来，并且（之后）任何引号都被两个引号替换，最后，如果整个结果包含一个引号，它必须是用（单）引号括起来。

下面是一个纯 XPath 2.0 表达式，它产生了这个：

for $b in /*/book,
    $q in codepoints-to-string(34),
    $NL in codepoints-to-string(10),
    $isbn in normalize-space(replace($b/@isbn, ',', concat($q,',',$q))),
    $t in normalize-space(replace($b/title, ',', concat($q,',',$q))),
    $d in normalize-space(replace($b/description, ',', concat($q,',',$q))),
    $res in
     escape-html-uri(string-join(($isbn,$t,$d), ',')),
    $res2 in replace($res, $q, concat($q,$q))
   return
    if(contains($res2, $q))
       then concat($q, $res2, $q, $NL)
       else concat($res2, $NL)

当此 XPath 表达式针对此（使用新的测试用例扩展）XML 文档进行评估时：

<books>
    <book isbn="1590593049">
        <title>Extending Flash MX 2004</title>
        <description>
        Using javascript alongwith actionscript 3.0 and mxml.</description>
    </book>
    <book isbn="0132149184">
        <title>Java Software Solutions</title>
        <description>
            Complete book full of case studies on business solutions and design concepts while building mission critical
            business applications.
        </description>
    </book>
    <book isbn="XX1234567">
        <title>Quotes and comma</title>
        <description>
            Hello, World from "Ms-Excel"
        </description>
    </book>
</books>

产生了想要的正确结果：

1590593049,Extending Flash MX 2004,Using javascript alongwith actionscript 3.0 and mxml.
0132149184,Java Software Solutions,Complete book full of case studies on business solutions and design concepts while building mission critical business applications.
"XX1234567,Quotes and comma,Hello"","" World from ""Ms-Excel"""

Answer 2

假设您的 xml 位于变量 $books 中，您可以使用以下命令创建一个 csv 文件，其中每个书节点位于新行上：

declare function local:my-replace($input) {
  for $i in $input
  return '"' || replace($i, '"', '""') || '"'
};
for $book in $books//book
return string-join(local:my-replace(($book/@isbn, $book/title, $book/description)), ",") || '
'

string-join 连接不同的字符串，本地函数my-replace 根据您的规范替换序列中的值。