RE: sql if exists

Oh I see what you want.

You can do test="exists(my:sql-query($connection))" and then write a
user-defined function

<xsl:function name="my:sql-query">
  <xsl:param name="connection"/>
  <saxon:query..../>
</xsl:function>

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

> -----Original Message-----
> From: Szabo, Patrick (LNG-VIE) [mailto:patrick.szabo@xxxxxxxxxxxxx]
> Sent: 15 April 2009 09:23
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: AW:  sql if exists
>
> Sorry but i don4t really understand what you mean.
>
> Dou you mean...
>
> <xsl:choose>
>   <xsl:when test="exists("SELECT STATEMENT")">
>     <...>
>   </xsl:when>
>   <xsl:otherwise>
>     <...>
>   </xsl:otherwise>
> </xsl:choose>
>
> ???
>
> I think i didn4t make myself clear.
>
> What i want to do:
>
> First i want to check if a certain row already exists in the DB.
> If that is not the case i want to insert that row.
>
> cheers
>
> Patrick Szabo
> EPD / XSLT Konvertierung
> Tel.: +43-1-534 52-1573
> Fax.: +43-1-534 52-1573
> patrick.szabo@xxxxxxxxxxxxx
>
> LexisNexis Verlag ARD Orac GmbH & Co KG
> Marxergasse 25, 1030 Wien
> FN 8333f, Handelsgericht Wien
> www.lexisnexis.at
>
>
>
>
>
>
> Patrick Szabo
> XSLT-Entwickler
>
> Tel.: +43 (1) 534 52 - 1573
> Fax: +43 (1) 534 52 - 146
>
> Patrick.Szabo@xxxxxxxxxxxxx
>
> LexisNexis Verlag ARD Orac GmbH & Co KG
> Marxergasse 25, 1030 Wien
> FN 8333f, Handelsgericht Wien
> http://www.lexisnexis.at/
>
> -----Urspr|ngliche Nachricht-----
>
> Von: Michael Kay [mailto:mike@xxxxxxxxxxxx]
> Gesendet: Mittwoch, 15. April 2009 10:09
> An: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Betreff: RE:  sql if exists
>
> Sure. You can do it at the XSLT level
>
> <xsl:choose>
>   <xsl:when test="exists(/a/b/c)">
>     <...>
>   </xsl:when>
>   <xsl:otherwise>
>     <...>
>   </xsl:otherwise>
> </xsl:choose>
>
> or at the XPath level:
>
> select="if (exists(/a/b/c)) then ... else ..."
>
> In practice people often leave out the call to exists()
> because the effective boolean value of a node-sequence is
> true if it's non-empty, so this is equivalent to test="/a/b/c".
>
> Michael Kay
> http://www.saxonica.com/
>
> > -----Original Message-----
> > From: Szabo, Patrick (LNG-VIE) [mailto:patrick.szabo@xxxxxxxxxxxxx]
> > Sent: 15 April 2009 08:32
> > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > Subject:  sql if exists
> >
> > Hi,
> >
> > I4m using saxon 9 and xslt 2.
> >
> > I want to insert data into a database with my xslt-sheet
> which is no
> > problem. The problem is that i only want to do that under certain
> > conditions.
> >
> > In SQL that4d look like this:
> >
> > "IF EXISTS ( select * from...)
> > 	Do something
> > ELSE
> > 	do something else"
> >
> > Is there a way to use that code in my xslt-sheet ?!
> >
> > Currently i4m using
> > "java:/net.sf.saxon.sql.SQLElementFactory" to insert
> something at all.
> >
> > Thx already
> >
> > cheers
> >
> > Patrick Szabo
> > EPD / XSLT Konvertierung
> > Tel.: +43-1-534 52-1573
> > Fax.: +43-1-534 52-1573
> > patrick.szabo@xxxxxxxxxxxxx
> >
> > LexisNexis Verlag ARD Orac GmbH & Co KG Marxergasse 25,
> 1030 Wien FN
> > 8333f, Handelsgericht Wien www.lexisnexis.at
> > <http://www.lexisnexis.at/>
> >
> >  <file://C:\Dokumente und
> > Einstellungen\szaboP\Anwendungsdaten\Microsoft\Signatures\LN
> > Vienna signature-Dateien\image001.jpg>
> >
> >
> >
> >
> > Patrick Szabo
> > XSLT-Entwickler
> >
> > Tel.: +43 (1) 534 52 - 1573
> > Fax: +43 (1) 534 52 - 146
> >
> > Patrick.Szabo@xxxxxxxxxxxxx
> >
> > LexisNexis Verlag ARD Orac GmbH & Co KG Marxergasse 25,
> 1030 Wien FN
> > 8333f, Handelsgericht Wien http://www.lexisnexis.at/