SQL XML parsing different nodes - sql

Question

i would like to ask you for help with parsing XML in SQL, where my XML looks like this, where Load is parrent which can be repeated X-times. I need Column SerNr and for each row need to bound Order name
where final table will looks like this
Example of table:
<ImageHistory>
<Load targets="2" totalTime="417">
<Orders>
<Order name="20548976"/>
</Orders>
<Data>
<Disk SerNr="XXXXXX" Size_mb="228936" LoadSuccessfull="true" />
<Disk SerNr="ZZZZZ" Size_mb="228936" LoadSuccessfull="true" />
</Data>
</Load>
</ImageHistory>
sql is
with data as (SELECT CAST(MY_XML AS xml) as MY_XML FROM OPENROWSET(BULK 'addres to xml', SINGLE_BLOB) AS T(MY_XML)),
datainfo as (
SELECT
MY_XML.Blasting.value(' #name', 'BIGINT') as Size_mb,
MY_XML.Blasting.value('#SerNr', 'varchar(32)') as SerNr
FROM data CROSS APPLY MY_XML.nodes('ImageHistory/Load/Data/Disk') AS MY_XML (Blasting))
select * from datainfo
thank you for help

Answer 1

I saved the XML as a file on the file system: e:\Temp\DiskSerialNumbers.xml
The rest is below.
SQL
;WITH XmlFile (Contents) AS
(
SELECT CAST(BulkColumn AS XML)
FROM OPENROWSET(BULK 'e:\Temp\DiskSerialNumbers.xml', SINGLE_BLOB) AS XmlData
)
SELECT c.value('(../../Orders/Order/#name)[1]', 'INT') AS [Name]
, c.value('#SerNr', 'VARCHAR(20)') AS [SerNr]
FROM XmlFile CROSS APPLY Contents.nodes('/ImageHistory/Load/Data/Disk') AS t(c);
Output
+----------+--------+
| Name | SerNr |
+----------+--------+
| 20548976 | XXXXXX |
| 20548976 | ZZZZZ |
+----------+--------+

Answer 2

You've got your answer already, but I want to point to the fact, that backward navigation (using ../../) is horribly slow with bigger structures.
I'd suggest this:
A mockup to simulate your issue:
DECLARE #yourTable TABLE(ID INT IDENTITY,YourXml XML);
INSERT INTO #yourTable VALUES
(N'<ImageHistory>
<Load targets="2" totalTime="417">
<Orders>
<Order name="20548976" />
</Orders>
<Data>
<Disk SerNr="XXXXXX" Size_mb="228936" LoadSuccessfull="true" />
<Disk SerNr="ZZZZZ" Size_mb="228936" LoadSuccessfull="true" />
</Data>
</Load>
</ImageHistory>');
--The query
SELECT t.ID
,ld.value('#targets','int') AS Load_Targets
,ld.value('#totalTime','int') AS Load_TotalTime
,ld.value('(Orders/Order/#name)[1]','int') AS Order_Name
,dsk.value('#SerNr','nvarchar(100)') AS Disk_SerNr
,dsk.value('#Size_mb','nvarchar(100)') AS Disk_Size_mb
,dsk.value('#LoadSuccessfull','bit') AS Disk_LoadSuccessfull
FROM #yourTable AS t
CROSS APPLY t.YourXml.nodes('/ImageHistory/Load') A(ld)
CROSS APPLY A.ld.nodes('Data/Disk') B(dsk);
The idea in short:
The first APPLY will dive down to <Load> and will return all <Load> elements (if there are more...
The second APPLY will use the fragment returned by the first APPLY and dive deeper down to <Disk>.
We fetch the order's name (and other values) calling .value() against the first fragment (which is the <Load> element) and we fetch the values of <Disk> calling .value() against the fragment of the second APPLY.