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Priti VermaSubject: Xquery ques. How to check for empty attributes
Author: Priti Verma
Date: 26 Apr 2004 02:23 PM
An XQuery ques:

I have a following XML doc

<Loan LoanId="123" InterestRate="5.9"/>
<Loan LoanId="" InterestRate="6.0"/>

I need an XQuery solution that creates Loan records without the
LoanId attribute, when LoanId attribute is blank.

<Loan Id="123" Int="5.9"/>
<Loan Int="6.0"/>
Posttop
Minollo I.Subject: Re: Xquery ques. How to check for empty attributes
Author: Minollo I.
Date: 26 Apr 2004 04:10 PM
One way to do that is:

<Loans>
{
for $Loan in /Loans/Loan
return
if($Loan/@LoanId and string-length($Loan/@LoanId)>0) then
<Loan Int="{$Loan/@InterestRate}" Id="{$Loan/@LoanId}"/>
else
<Loan Int="{$Loan/@InterestRate}"/>
}
</Loans>

...which will work fine in Stylus 173i and its mapper.

A much cleaner solution would probably be:

<Loans>
{
for $Loan in /Loans/Loan
return
<Loan Int="{$Loan/@InterestRate}">
{
if($Loan/@LoanId and string-length($Loan/@LoanId)>0) then
(attribute Id {$Loan/@LoanId})
else ()
}
</Loan>
}
</Loans>

...this will work fine in BL173i if you manually edit/run it, but it won't
work in XQuery mapper; we are working to address this issue.

Minollo
   
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