XQuery

In 2005 version of SQL Server, XQuerying was introduced. It’s a powerful feature and when used together with a CTE, it helps to keep code simple and clean. I use XML extensively in my code and many a time, I find myself looking up code, searching the internet or trying things out myself. I hope this post will be a single point of reference to most of the usual XQuery coding.

Following is a simple script to read from an XML variable. Same code can be used to read from an XML column as well.

NOTE: I will append more XQuery code samples to this post.

DECLARE @xmlProduct XML = 
'<Catalog>
	<Product>
		<Name>Selle Italia Road</Name>
		<Code>SIR-1</Code>
		<Category>Saddle</Category>
		<Description>Sleek saddle from Selle Italia</Description>
		<UnitPrice>50</UnitPrice>
		<Currency>USD</Currency>
	</Product>
	<Product>
		<Name>Brooks Tourer</Name>
		<Code>BT-T</Code>
		<Category>Saddle</Category>
		<Description>Brooks leather saddle for touring</Description>
		<UnitPrice>120</UnitPrice>
		<Currency>USD</Currency>
	</Product>
</Catalog>
'
--Read from nodes
SELECT
c.value('Name[1]','varchar(50)') [ProductName],
c.value('Code[1]','varchar(50)') [Code],
c.value('Category[1]','varchar(50)') [Category],
c.value('UnitPrice[1]','varchar(50)') + CHAR(32) + c.value('Currency[1]','varchar(50)') [Price],
c.value('Description[1]','varchar(50)') [Description]
FROM 
@xmlProduct.nodes('//Catalog/Product') AS TAB(c)

Output:
XQueryOutput

Advertisements

Retrieve unsaved query

I was working on a remote machine and while I was away, the machine was restarted. Lost the scripts I had not saved, or so I thought; and then I came up with this – was a life saver!

SELECT TOP 10 
EST.text
FROM sys.dm_exec_query_stats EQS
CROSS APPLY sys.dm_exec_sql_text(eqs.sql_handle) EST
WHERE EST.text LIKE '%text%'
ORDER BY last_execution_time DESC