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Query XML File

Hi All,

I have an xml file that I would like to query.

The file has 3 "columns" lets just call them col1, col2, col3

I want to query for instance, col1 and return the value of col2.
The rows are unique, so returning more than 1 "record" or value will not occur.

I haven't done much with xml and would like a nice example if possible.

Thanks
0
nzfire
Asked:
nzfire
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1 Solution
 
appariCommented:
try something like this

xmlDS = New DataSet
xmlDS.ReadXml(XmlName)

if xmlDS isnot nothing andalso xmlDS.tables.count<>0 then
   dim dtTest as datatable = xmlDS.tables(0)
   dim drData as datarow() = dtTest.select(" col1 = '" & col1Value & "' ")
end if
0
 
vb_jonasCommented:
... and then:

If drData.Length=1 then
  return drData(0)("col2")
Else
  ' not found or found more than 1
End If

0
 
vb_jonasCommented:
if you like to you can use the compute method of the datatable:

returnvalue = dtTest.Compute("Sum(col2)","col1='" & col1filter & "'")

which will return the sum of col2 for records where col1=col1filter.

0
 
nzfireAuthor Commented:
Hi All,

Thanks for those posts. I was thinking along the lines of a dataset.

How about using an XPath query?

Which is faster? A dataset or reading through the xml nodes?

Thanks again for your help.
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