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RE: Comparing to SQL NULL

Subject: RE: Comparing to SQL NULL
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Mon, 24 Jul 2006 21:43:01 +0100
sql null
There are two main ways of representing an absent value in XML. The relevant
element might be omitted entirely, or it might be present with empty
content. (There's a third way, the xsi:nil attribute, but I don't think
anyone uses it.) To answer your question we need to know what the XML looks
like, and what $v1 is.

Michael Kay
http://www.saxonica.com/ 

> -----Original Message-----
> From: Oleg Konovalov [mailto:olegkon@xxxxxxxxx] 
> Sent: 24 July 2006 20:41
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Comparing to SQL NULL
> 
> Hi,
> 
> I am writing some XSL code processing database columns 
> (actually, adding a new column to the existing table in old 
> application) and need to handle a situation when the column 
> does not have a value yet.
> So how do I express that condition in XSL:
> <xsl:when test="$v1 = 'NULL'">
> ... do something
> </xsl:when>
> or <xsl:when test="$v1 = 'NaN'">
> ... do something
> </xsl:when>
> or <xsl:when test="$v1 = ''">   ... blank string: ''
> ... do something
> </xsl:when>  ???
> 
> Please help.
> 
> Sorry for the newbie question.
> Using XSLT1.0 [and Cocoon 2.0.x]
> 
> Thank you,
> Oleg.

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