can QXmlQuery query on a QString which holds the whole XML document

[zhongzhu]

Looks like QXmlQuery only queries an XML file on disk. My situation is all my XML docs are saved in a QStringList, each QString is a XML doc. I don't want to save all the XML docs into files for QXmlQuery to do the query. Is there anyway for QXmlQuery to query on the XML doc in my QString?

[AcerExtensa]

maybe QBuffer can help you...

[Lykurg]

... with QXmlQuery::bindVariable ( const QXmlName & name, QIODevice * device )

[brcain]

Is this the correct way of doing this?

QFile file("./books.xml");
QDomDocument doc;
doc.setContent(&file, true);
 
QByteArray xmlDoc = doc.toByteArray();
QBuffer xmlBuffer(&xmlDoc);
xmlBuffer.open(QIODevice::ReadOnly);
QXmlQuery query;
query.bindVariable("xmlDoc", &xmlBuffer);
query.setQuery("doc($xmlDoc)/bookstore/book[price>30]/title");
 
QString testOutput;
query.evaluateTo(&testOutput);
cout << testOutput.toStdString() << endl;

QFile file("./books.xml");
QDomDocument doc;
doc.setContent(&file, true);

QByteArray xmlDoc = doc.toByteArray();
QBuffer xmlBuffer(&xmlDoc);
xmlBuffer.open(QIODevice::ReadOnly);
QXmlQuery query;
query.bindVariable("xmlDoc", &xmlBuffer);
query.setQuery("doc($xmlDoc)/bookstore/book[price>30]/title");

QString testOutput;
query.evaluateTo(&testOutput);
cout << testOutput.toStdString() << endl;

To copy to clipboard, switch view to plain text mode 

Given the contents of books.xml (shown at bottom of this post), I get the following results (which appear correct).

<title lang="en">XQuery Kick Start</title>
<title lang="en">Learning XML</title>

<title lang="en">XQuery Kick Start</title>
<title lang="en">Learning XML</title>

To copy to clipboard, switch view to plain text mode 

books.xml contents:

<?xml version="1.0" encoding="ISO-8859-1"?>
 
<bookstore>
 
<book category="COOKING">
  <title lang="en">Everyday Italian</title>
  <author>Giada De Laurentiis</author>
  <year>2005</year>
  <price>30.00</price>
</book>
 
<book category="CHILDREN">
  <title lang="en">Harry Potter</title>
  <author>J K. Rowling</author>
  <year>2005</year>
  <price>29.99</price>
</book>
 
<book category="WEB">
  <title lang="en">XQuery Kick Start</title>
  <author>James McGovern</author>
  <author>Per Bothner</author>
  <author>Kurt Cagle</author>
  <author>James Linn</author>
  <author>Vaidyanathan Nagarajan</author>
  <year>2003</year>
  <price>49.99</price>
</book>
 
<book category="WEB">
  <title lang="en">Learning XML</title>
  <author>Erik T. Ray</author>
  <year>2003</year>
  <price>39.95</price>
</book>
 
</bookstore>

<?xml version="1.0" encoding="ISO-8859-1"?>

<bookstore>

<book category="COOKING">
  <title lang="en">Everyday Italian</title>
  <author>Giada De Laurentiis</author>
  <year>2005</year>
  <price>30.00</price>
</book>

<book category="CHILDREN">
  <title lang="en">Harry Potter</title>
  <author>J K. Rowling</author>
  <year>2005</year>
  <price>29.99</price>
</book>

<book category="WEB">
  <title lang="en">XQuery Kick Start</title>
  <author>James McGovern</author>
  <author>Per Bothner</author>
  <author>Kurt Cagle</author>
  <author>James Linn</author>
  <author>Vaidyanathan Nagarajan</author>
  <year>2003</year>
  <price>49.99</price>
</book>

<book category="WEB">
  <title lang="en">Learning XML</title>
  <author>Erik T. Ray</author>
  <year>2003</year>
  <price>39.95</price>
</book>

</bookstore>

To copy to clipboard, switch view to plain text mode