Generate BOD OAGIS XML from SQL Server - sql-server

Question

I need to generate an XML document from SQL Server that conforms to the BOD OAGIS schema.
I have a partial solution but am not getting the exact format I need.
This is my query:
SELECT
(
SELECT Customer As 'SalesOrderHeader/CustomerParty/ID',
(
SELECT LinesNo As 'LineNumber'
FROM LinesInterfaccia
WHERE HeaderInterfaccia.OrderNo = LinesInterfaccia.OrderNo
FOR XML path('salesline'), TYPE
)
FROM HeaderInterfaccia
FOR XML path('salesorder'), type
).query('for $i in /salesorder return <DataArea>{$i}</DataArea>');
This is my result:
<DataArea>
<salesorder>
<SalesOrderHeader>
<CustomerParty>
<ID>BP00003184</ID>
</CustomerParty>
</SalesOrderHeader>
<salesline>
<LineNumber>10</LineNumber>
</salesline>
<salesline>
<LineNumber>20</LineNumber>
</salesline>
</salesorder>
</DataArea>
<DataArea>
<salesorder>
<SalesOrderHeader>
<CustomerParty>
<ID>BP00003184</ID>
</CustomerParty>
</SalesOrderHeader>
<salesline>
<LineNumber>10</LineNumber>
</salesline>
</salesorder>
</DataArea>
but I need this format:
<DataArea>
<Process>tenant</Process>
<salesorder>
<SalesOrderHeader>
<CustomerParty>
<ID>BP00003184</ID>
</CustomerParty>
</SalesOrderHeader>
<salesline>
<LineNumber>10</LineNumber>
</salesline>
<salesline>
<LineNumber>20</LineNumber>
</salesline>
</salesorder>
</DataArea>
<DataArea>
<Process>tenant</Process>
<salesorder>
<SalesOrderHeader>
<CustomerParty>
<ID>BP00003184</ID>
</CustomerParty>
</SalesOrderHeader>
<salesline>
<LineNumber>10</LineNumber>
</salesline>
</salesorder>
</DataArea>
I also tried:
SELECT
(
SELECT 'tenant' as 'Process',
Customer As 'SalesOrderHeader/CustomerParty/ID',
(select LinesNo as 'LineNumber/no'
with result:
<DataArea>
<salesorder>
<Process>tenant</Process>
<SalesOrderHeader>
My expected structure is:
<DataArea>
<Process>
</Process>
<SalesOrder>
<SalesLine>
</Salesline>
<SalesLine>
</Salesline>
</salesOrder>
</DataArea>

Answer 1

Try it like this:
DECLARE #tblOrder TABLE(OrderID INT IDENTITY, CustomerID VARCHAR(100));
INSERT INTO #tblOrder VALUES('BP00003184')
,('One More');
DECLARE #tblOrderLine TABLE(OrderLineID INT IDENTITY, OrderID INT, LineNumber INT);
INSERT INTO #tblOrderLine VALUES(1,10),(1,20)
,(2,22),(2,33);
SELECT 'tenant' AS Process
,o.CustomerID AS [salesorder/SalesOrderHeader/CustomerParty/ID]
,(
SELECT LineNumber
FROM #tblOrderLine AS ol
WHERE ol.OrderID=o.OrderID
FOR XML PATH('salesline'),TYPE
) AS salesorder
FROM #tblOrder AS o
FOR XML PATH('DataArea');
This structure is missing a root element, which is - by definition invalid XML. SQL Server has no problem with this, but other engines might have...
You can think of the process as such:
Go down the columns of the select
Oh, there's a new XPath (Process), let's open a new tag
Oh, the next one is new, close /Process
Uh, quite large (salesorder/SalesOrderHeader/CustomerParty/ID), open it!
Ah, this is an XML itself. It will be called salesorder. Nice! still open!
Good, I found the FROM, let's close the current XPath