Update 3rd level deep field value in an XML using xQuery - sql

Question

I have the following sample XML and I am looking to Update:
AttendeeID to 7878 (will be a sql variable) where sequence = 1 (will be a sql variable)
Expected output is to see 7878 in the AttendeeID field's value. When I run any of the 2 options I tried, it does not yield the correct result. For Eg. Delete works but the element is not added. Replace value does not update the value.
Any inputs are highly appreciated. Thank you.
--------XML ---------------------------
DECLARE #cartXML XML =
'<OBJECT CLASS="Test1" ID="-1" FULL="FULL" VERSION="1">
<FIELD NAME="OrderDate">20220619</FIELD>
<FIELD NAME="OrderParty">Individual</FIELD>
<FIELD NAME="ShipToID">34567</FIELD>
<FIELD NAME="ShipToAddress1">123 Test Street</FIELD>
<FIELD NAME="ShipToCity">TestCity</FIELD>
<FIELD NAME="ShipToState">IL</FIELD>
<FIELD NAME="ShipTocountry">USA</FIELD>
<FIELD NAME="TaxNumber">444</FIELD>
<FIELD NAME="DiscountCode">Summer22</FIELD>
<SUBTYPE NAME="SubType1">
<OBJECT NAME="SubType111" ID="-1">
<FIELD NAME="TestID">-1</FIELD>
<FIELD NAME="Sequence">1</FIELD>
<FIELD NAME="ParentSequence">-1</FIELD>
<FIELD NAME="ExtID">-1</FIELD>
<FIELD NAME="ExtName">ABC</FIELD>
</OBJECT>
<OBJECT NAME="SubType111" ID="-1">
<FIELD NAME="TestID">-1</FIELD>
<FIELD NAME="Sequence">2</FIELD>
<FIELD NAME="ParentSequence">1</FIELD>
<FIELD NAME="ExtID">-1</FIELD>
<FIELD NAME="ExtName">DEF</FIELD>
<FIELD NAME="__ExtendedData"><OBJECT
CLASS="Meet123" ID="-1" FULL="FULL"
VERSION="1"><FIELD
NAME="OrderDetailID">-1</FIELD><FIELD
NAME="OrderID">-1</FIELD><FIELD
NAME="Sequence">0</FIELD><FIELD
NAME="AttendeeID">123</FIELD><FIELD NAME="AttendeeID_Name">Test, Mark/I
H 6</FIELD><FIELD
NAME="ShowList">1</FIELD><FIELD
NAME="BdgeName">Mark</FIELD><FIELD
NAME="BadgeCompanyName">I H 6</FIELD>
</OBJECT></FIELD>
</OBJECT>
<OBJECT NAME="SubType111" ID="-1">
<FIELD NAME="TestID">-1</FIELD>
<FIELD NAME="Sequence">3</FIELD>
<FIELD NAME="ParentSequence">1</FIELD>
<FIELD NAME="ExtID">-1</FIELD>
<FIELD NAME="ExtName">GHI</FIELD>
</OBJECT>
</SUBTYPE>
<SUBTYPE NAME="SubType2"/>
<SUBTYPE NAME="SubType3"/>
</OBJECT>';
-----------------------SQL -----------------------
select #cartXML as originalXML
DECLARE #ID as int ,#productID as int, #attendeeId as int = 7878,
#sequenceId as int, #orderLineXML as XML , #ExtendedAttrDetail as XML
SET #sequenceId = 2
select #orderlineXML = c.query('.'), #ExtendedAttrDetail = w.query('.') from
#cartXML.nodes('/OBJECT/SUBTYPE/OBJECT[FIELD[#NAME="Sequence"]/text()=sql:variable("#sequenceId")]') t1(c)
Cross APPLY (VALUES(TRY_CAST(c.query('FIELD[#NAME="__ExtendedData"]').value('.','NVARCHAR(MAX)') AS XML)))AS t2(w)
-----This works..But I am looking to alter #cartXML as it contains the entire XML
SET #ExtendedAttrDetail.modify('replace value of
(/OBJECT/FIELD[#NAME="AttendeeID"]/text())[1]
with sql:variable("#attendeeId")')
--select #ExtendedAttrDetail
------- Option 1( Preferred)---does not work--
SET #cartXML.modify ('replace value of
(/OBJECT/SUBTYPE/OBJECT[FIELD[#NAME="Sequence"]/text()=sql:variable("#sequenceId")]/FIELD[#NAME="__ExtendedData"]/OBJECT/FIELD[#NAME="AttendeeID"]/text())[1] with sql:variable("#attendeeId")')
select #cartXML as ModifiedDirectly
---Option 2 (Insert does not add correctly )
--SET #cartXML.modify('delete
--/OBJECT/SUBTYPE/OBJECT[FIELD[#NAME="Sequence"]/text()=sql:variable("#sequenceId")]
--/FIELD[#NAME="__ExtendedData"]');
--SET #cartXML.modify('insert sql:variable("#ExtendedAttrDetail") into
--(/OBJECT/SUBTYPE/OBJECT[FIELD[#NAME="Sequence"]/text()=sql:variable("#sequenceId")])
--[1]');
--SELECT #cartXML as UpdatedXL;

Answer 1

Please try the following solution.
The issue is that the XML fragment in question is encoded.
SQL
DECLARE #cartXML XML =
N'<OBJECT CLASS="Test1" ID="-1" FULL="FULL" VERSION="1">
<FIELD NAME="OrderDate">20220619</FIELD>
<FIELD NAME="OrderParty">Individual</FIELD>
<FIELD NAME="ShipToID">34567</FIELD>
<FIELD NAME="ShipToAddress1">123 Test Street</FIELD>
<FIELD NAME="ShipToCity">TestCity</FIELD>
<FIELD NAME="ShipToState">IL</FIELD>
<FIELD NAME="ShipTocountry">USA</FIELD>
<FIELD NAME="TaxNumber">444</FIELD>
<FIELD NAME="DiscountCode">Summer22</FIELD>
<SUBTYPE NAME="SubType1">
<OBJECT NAME="SubType111" ID="-1">
<FIELD NAME="TestID">-1</FIELD>
<FIELD NAME="Sequence">1</FIELD>
<FIELD NAME="ParentSequence">-1</FIELD>
<FIELD NAME="ExtID">-1</FIELD>
<FIELD NAME="ExtName">ABC</FIELD>
</OBJECT>
<OBJECT NAME="SubType111" ID="-1">
<FIELD NAME="TestID">-1</FIELD>
<FIELD NAME="Sequence">2</FIELD>
<FIELD NAME="ParentSequence">1</FIELD>
<FIELD NAME="ExtID">-1</FIELD>
<FIELD NAME="ExtName">DEF</FIELD>
<FIELD NAME="__ExtendedData"><OBJECT
CLASS="Meet123" ID="-1" FULL="FULL"
VERSION="1"><FIELD
NAME="OrderDetailID">-1</FIELD><FIELD
NAME="OrderID">-1</FIELD><FIELD
NAME="Sequence">0</FIELD><FIELD
NAME="AttendeeID">123</FIELD><FIELD NAME="AttendeeID_Name">Test, Mark/I
H 6</FIELD><FIELD
NAME="ShowList">1</FIELD><FIELD
NAME="BdgeName">Mark</FIELD><FIELD
NAME="BadgeCompanyName">I H 6</FIELD>
</OBJECT></FIELD>
</OBJECT>
<OBJECT NAME="SubType111" ID="-1">
<FIELD NAME="TestID">-1</FIELD>
<FIELD NAME="Sequence">3</FIELD>
<FIELD NAME="ParentSequence">1</FIELD>
<FIELD NAME="ExtID">-1</FIELD>
<FIELD NAME="ExtName">GHI</FIELD>
</OBJECT>
</SUBTYPE>
<SUBTYPE NAME="SubType2"/>
<SUBTYPE NAME="SubType3"/>
</OBJECT>';
DECLARE #ExtendedData XML
, #attendeeId INT = 770;;
-- Step #1: select XML fragment in question as real XML data type
SELECT #ExtendedData = w
FROM #cartxml.nodes('/OBJECT/SUBTYPE/OBJECT[#ID="-1"]') as t1(c)
CROSS APPLY (VALUES(TRY_CAST(c.query('FIELD[#NAME="__ExtendedData"]').value('.','NVARCHAR(MAX)') AS XML))) AS t2(w)
WHERE w.exist('/OBJECT[#CLASS="Meet123"]') = 1;
-- Step #2: remove encoded XML fragment
SET #cartXML.modify('replace value of (/OBJECT/SUBTYPE[#NAME="SubType1"]/OBJECT/FIELD[#NAME="__ExtendedData"]/text())[1]
with ""');
-- Step #3: modify AttendeeID
SET #ExtendedData.modify('replace value of
(/OBJECT/FIELD[#NAME="AttendeeID"]/text())[1]
with sql:variable("#attendeeId")');
-- Step #4: insert real XML fragment
SET #cartXML.modify('insert sql:variable("#ExtendedData") into
(/OBJECT/SUBTYPE[#NAME="SubType1"]/OBJECT/FIELD[#NAME="__ExtendedData"])[1]');
-- test
SELECT #cartXML;