Parse, filter nested XML in TSQL - sql-server

Question

I have a table (table1) which has a column containing XML data.
I need to parse that XML and create rows of data from the child elements of the element -
The output needs to be something like
TestID Sequence ParentSequence ExtID ExtName
-1 1 -1 1 ABC
-1 2 -1 1 DEF
-1 2 -1 1 GHI
But I am getting an empty result set with every other method I tried.
I have focused on accessing Sequence as rest will follow the same process.
Not sure why this does not work. Any help in this regard is appreciated. Thank you. The SQL I have tried is after the XML(commented text is the options I have tried)
SQL
-- DDL and sample data population, start
DECLARE #tbl TABLE (ID INT IDENTITY PRIMARY KEY, xmlfield
NVARCHAR(MAX));
INSERT INTO #tbl (xmlfield) VALUES
(N'<OBJECT CLASS="Test1" ID="-1" FULL="FULL" VERSION="1">
<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>
<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>');
-- DDL and sample data population, end
;WITH rs AS
(
SELECT ID, TRY_CAST(xmlfield AS XML) AS cartxml
FROM #tbl
)
SELECT ID
, c.value('(FIELD[#NAME="TestID"]/text())[1]', 'INT') AS TestID
, c.value('(FIELD[#NAME="Sequence"]/text())[1]', 'INT') AS [Sequence]
, c.value('(FIELD[#NAME="ParentSequence"]/text())[1]', 'INT') AS
ParentSequence
, c.value('(FIELD[#NAME="ExtID"]/text())[1]', 'INT') AS ExtID
, c.value('(FIELD[#NAME="ExtName"]/text())[1]', 'VARCHAR(20)') AS
ExtName
,c1.value('(FIELD[#NAME="AttendeeID"]/text())[1]', 'VARCHAR(20)') AS
AttendeeId,
,c1.value('(FIELD[#NAME="AttendeeID_Name"]/text())[1]',
'VARCHAR(20)') AS AttendeeName,
FROM src As T
CROSS APPLY cartxml.nodes('/OBJECT/SUBTYPE/OBJECT[#ID="-1"]') as
t2(c)
OUTER APPLY cartxml.nodes('/
OBJECT/SUBTYPE/OBJECT[#ID="-1"]/FIELD[#NAME="__ExtendedData"]') as
t3(c1)

Answer 1

Please try the following solution.
SQL
-- DDL and sample data population, start
DECLARE #tbl TABLE (ID INT IDENTITY PRIMARY KEY, xmlfield NVARCHAR(MAX));
INSERT INTO #tbl (xmlfield) VALUES
(N'<OBJECT CLASS="Test1" ID="-1" FULL="FULL" VERSION="1">
<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>');
-- DDL and sample data population, end
;WITH rs AS
(
SELECT ID, TRY_CAST(xmlfield AS XML) AS cartxml
FROM #tbl
)
SELECT ID
, c.value('(FIELD[#NAME="TestID"]/text())[1]', 'INT') AS TestID
, c.value('(FIELD[#NAME="Sequence"]/text())[1]', 'INT') AS [Sequence]
, c.value('(FIELD[#NAME="ParentSequence"]/text())[1]', 'INT') AS ParentSequence
, c.value('(FIELD[#NAME="ExtID"]/text())[1]', 'INT') AS ExtID
, c.value('(FIELD[#NAME="ExtName"]/text())[1]', 'VARCHAR(20)') AS ExtName
, w.value('(OBJECT/FIELD[#NAME="AttendeeID"]/text())[1]', 'VARCHAR(20)') AS AttendeeID
, w.value('(OBJECT/FIELD[#NAME="AttendeeID_Name"]/text())[1]', 'VARCHAR(20)') AS AttendeeID_Name
FROM rs AS t
CROSS APPLY 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;
Output
ID
TestID
Sequence
ParentSequence
ExtID
ExtName
AttendeeID
AttendeeID_Name
1
-1
2
1
-1
DEF
123
Test, Mark/I H 6