[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

RE: Variable or Query for Speed

Subject: RE: Variable or Query for Speed
From: "Michael Kay" <michael.h.kay@xxxxxxxxxxxx>
Date: Tue, 4 Feb 2003 23:36:28 -0000
variable in query
The only way to find out is to measure it and see: it might well vary
from one processor to another. It's unlikely to make a worthwhile
difference either way.

If you do use a variable, make it a string and not a result tree
fragment. That is, write

<xsl:variable name="tableName" select="string(@name)">

not

<xsl:variable name="tableName">
   <xsl:value-of select="@name" />
</xsl:variable>

Result tree fragments are very expensive, and you can't rely on them
being optimized.

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx 

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Peter Eschenbrenner
> Sent: 04 February 2003 20:49
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Variable or Query for Speed
> 
> 
> A stylesheet I am working with uses a specific value multiple 
> times. The tableName it is reading from xml is concatenated 
> with multiple strings in various for-each loops throughout 
> the stylesheet.  With the current xml document I am working 
> with, this means the value is used almost 100 times.
> 
> Question:
> Is it faster to query the xml file everytime I want that 
> variable, or to query it once, store it in a variable, and 
> echo the value of the variable when I need it?
> 
> Use this every time I want the value:
> <xsl:value-of select="@name" />
> 
> 
> Or define a variable with that value and use the variable each time
> instead:
> <xsl:variable name="tableName">
> 	<xsl:value-of select="@name" />
> </xsl:variable>
> 
> <xsl:value-of select="$tableName" />
> 
> 
> 
> Peter E.
> 
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
> 


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list


Current Thread

PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.