Get values from XML field with SQL Server - sql

Question

I would like to get the value from a xml column with T-SQL.
My xml column named XML contains :
<SIMBATCHJOB ONFAIL="2" ID="4" ONPASS="0"/>
How can I get the second parameter? For example here ID.
I have tried a request like this:
DECLARE #xml XML
SELECT #xml = N'<SIMBATCHJOB ONFAIL="2" ID="4" ONPASS="0"/>'
SELECT
T.C.value('(SIMBATCHJOB)[1]', 'int') as test1
FROM
#xml.nodes('SIMBATCHJOB') T(C)
My table is structured like this:
ID | XML
If I try this query:
Select ID
,Value = cast([xml] as xml).value('SIMBATCHJOB[1]/#ID','int')
From SIM_JOBS
where id = 179
This query return me the ID and the Value is empty
Do you understand this ?
Thanks in advance

Answer 1

Jeroen is 100% correct, but one option is to use a CROSS APPLY and normalize your attributes.
The Sequence will hold true to the sequence in the actual XML. I suspect you could filter as needed.
Example
Declare #XML xml = '<SIMBATCHJOB ONFAIL="2" ID="4" ONPASS="0"/>'
Select Seq = row_number() over (Order By (Select NULL))
,Attribute = a.value('local-name(.)','varchar(100)')
,Value = a.value('.','varchar(max)')
From #XML.nodes('/SIMBATCHJOB ') as C1(n)
Cross Apply C1.n.nodes('./#*') as C2(a)
Returns
Seq Attribute Value
1 ONFAIL 2
2 ID 4
3 ONPASS 0
EDIT - Update for Comments ---
This will return the SECOND Attribute/Value regardles of what is is
Declare #YourTable table (ID int,[xml] xml)
Insert Into #YourTable values
(1,'<SIMBATCHJOB ONFAIL="2" ID="4" ONPASS="0"/>'),
(2,'<SIMBATCHJOB ONFAIL="2" ID="99" ONPASS="1"/>')
Select A.ID
,B.*
From #YourTable A
Cross Apply (
Select *
From (
Select Seq = row_number() over (Order By (Select NULL))
,Attribute = a.value('local-name(.)','varchar(100)')
,Value = a.value('.','varchar(max)')
From A.xml.nodes('/SIMBATCHJOB ') as C1(n)
Cross Apply C1.n.nodes('./#*') as C2(a)
) B1
Where B1.Seq=2
) B
Returns
ID Seq Attribute Value
1 2 ID 4
2 2 ID 99
EDIT 2: - Get JUST ID regardless of Sequence
Declare #YourTable table (ID int,[xml] xml)
Insert Into #YourTable values
(1,'<SIMBATCHJOB ONFAIL="2" ID="4" ONPASS="0"/>'),
(2,'<SIMBATCHJOB ONFAIL="2" ID="99" ONPASS="1"/>')
Select A.ID
,Value = [xml].value('SIMBATCHJOB[1]/#ID','int')
From #YourTable A
Returns
ID Value
1 4
2 99