SQL query with XML parameter - tsql

Question

EDIT: I have found a relevant answer already on stack overflow here:
XQuery [value()]: 'value()' requires a singleton (or empty sequence), found operand of type 'xdt:untypedAtomic *'
I have not dealt with XML in T-SQL before, and I am modifying an existing legacy stored proc, and picking most if it up through trial and error.
however I have hit a problem where trial and error is proving fruitless, and very slow. Think it's time to appeal to stack overflow gurus!
Here is some XML
<?xml version=\"1.0\"?>
<Notification xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">
<NotificationId>0</NotificationId>
<UserNotifications>
<UserNotification>
<UserNotificationId>0</UserNotificationId>
<NotificationId>0</NotificationId>
<UserId>13514</UserId>
<MessageTypeId>1</MessageTypeId>
</UserNotification>
<UserNotification>
<UserNotificationId>0</UserNotificationId>
<NotificationId>0</NotificationId>
<UserId>13514</UserId>
<MessageTypeId>2</MessageTypeId>
</UserNotification>
</UserNotifications>
</Notification>
The Stored Proc in question accepts the above XML as a parameter:
CREATE PROCEDURE [dbo].[Notification_Insert]
#ParametersXml XML
AS
BEGIN
The XML contains child "UserNotification" elements. I would like to select the UserId, MessageTypeId of each UserNotification, into a table like this
UserId | MessageTypeId
13514 | 1
13514 | 2
Obviously the size of the collection is not fixed.
My current attempt (which doesn't work - is along these lines:
DECLARE #UserDetails TABLE ( UserId INT, MessageTypeId INT);
INSERT INTO #UserDetails (UserId, MessageTypeId)
SELECT Tab.Col.value('#UserId','INT'),
Tab.Col.value('#MessageTypeId','INT')
FROM #ParametersXml.nodes('/Notification/UserNotifications[not(#xsi:nil = "true")][1]/UserNotification') AS Tab(Col)
But this never inserts anything..
I have been playing around with this for a while now and not had any joy :(

Answer 1

I would suggest going through the links below. I found them short and quick to go through:
http://blog.sqlauthority.com/2009/02/12/sql-server-simple-example-of-creating-xml-file-using-t-sql/
http://blog.sqlauthority.com/2009/02/13/sql-server-simple-example-of-reading-xml-file-using-t-sql/

Answer 2

I found the solution to this problem through further searching stack overflow.
The query I need (thanks to XQuery [value()]: 'value()' requires a singleton (or empty sequence), found operand of type 'xdt:untypedAtomic *')
INSERT INTO #UserDetails (UserId, MessageTypeId)
SELECT UserNotification.value('UserId[1]','INT'),
UserNotification.value('MessageTypeId[1]','INT')
FROM #ParametersXml.nodes('//Notification/UserNotifications') AS x(Coll)
cross apply #ParametersXml.nodes('//Notification/UserNotifications/UserNotification') as un(UserNotification)