مقالة
10/01/2010

upper-case Function (XQuery)

This function converts each character in $arg to its upper case equivalent. The Microsoft Windows binary case conversion for Unicode code points specifies how characters are converted to upper case. This standard is different than the mapping for Unicode standard code point standard.

Syntax

fn:upper-case($arg as xs:string?) as xs:string

Arguments

Term	Definition
$arg	The string value to be converted to upper case.

Remarks

If the value of $arg is empty, a zero length string is returned.

Examples

A. Changing a string to upper case

The following example changes the input string 'abcDEF!@4' to upper case.

DECLARE @x xml = N'abcDEF!@4';
SELECT @x.value('fn:upper-case(/text()[1])', 'nvarchar(10)');

B. Search for a Specific Character String

This example shows how to use the upper-case function to perform a case-insensitive search.

USE AdventureWorks
GO
--WITH XMLNAMESPACES clause specifies the namespace prefix
--to use. 
WITH XMLNAMESPACES ('https://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription' AS pd)
--The XQuery contains() function is used to determine whether
--any of the text nodes below the <Summary> element contain
--the word 'frame'. The upper-case() function is used to make
--the search case-insensitive.

SELECT ProductModelID, CatalogDescription.query('
      <Prod>
         { /pd:ProductDescription/@ProductModelID }
         { /pd:ProductDescription/pd:Summary }
      </Prod>
 ') as Result
FROM Production.ProductModel
where CatalogDescription.exist('
/pd:ProductDescription/pd:Summary//text()[
          contains(upper-case(.), "FRAME")]')  = 1

Here is the result set.

ProductModelID Result

-------------- ---------

19 <Prod ProductModelID="19">

<pd:Summary xmlns:pd="https://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription">

<p1:p xmlns:p1="http://www.w3.org/1999/xhtml">Our top-of-the-line competition mountain bike.

Performance-enhancing options include the innovative HL Frame,

super-smooth front suspension, and traction for all terrain.

</p1:p>

</pd:Summary>

</Prod>

25 <Prod ProductModelID="25">

<pd:Summary xmlns:pd="https://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription">

<p1:p xmlns:p1="http://www.w3.org/1999/xhtml">This bike is ridden by race winners. Developed with the

Adventure Works Cycles professional race team, it has a extremely light

heat-treated aluminum frame, and steering that allows precision control.