Parse selected values from XML in SQL - sql

Question

I have the following XML file (I put here only a short scheme), it's a SEPA XML bank statement. I'm not familiar with parsing XML files, my next move will be inserting and comparing to data stored in the SQL databases for error checks. Sadly, I know what to do next, don't know how to make progress with my first step. All I need is to create a table to select values of 2 attributes from a file stored at a particular place
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:camt.053.001.02">
<BkToCstmrStmt>
<GrpHdr>
..........
</GrpHdr>
<Stmt>
<Ntry>
<Amt Ccy="EUR">RequestedAmount1</Amt>
<AddtlNtryInf>RequestedInfo1</AddtlNtryInf>
</Ntry>
<Ntry>
<Amt Ccy="EUR">RequestedAmount2</Amt>
<AddtlNtryInf>RequestedInfo2</AddtlNtryInf>
</Ntry>
<Ntry>
<Amt Ccy="EUR">RequestedAmount3</Amt>
<AddtlNtryInf>RequestedInfo3</AddtlNtryInf>
</Ntry>
</Stmt>
</BkToCstmrStmt>
</Document>
If the XML structure was simpler, for example like this...
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Ntry>
<Amt Ccy="EUR">RequestedAmount1</Amt>
<AddtlNtryInf>RequestedInfo1</AddtlNtryInf>
</Ntry>
<Ntry>
<Amt Ccy="EUR">RequestedAmount2</Amt>
<AddtlNtryInf>RequestedInfo2</AddtlNtryInf>
</Ntry>
<Ntry>
<Amt Ccy="EUR">RequestedAmount3</Amt>
<AddtlNtryInf>RequestedInfo3</AddtlNtryInf>
</Ntry>
...then I'd use this query to select requested attributes Amt and AddtlNtryInf and it works perfectly
SELECT
MY_XML.Ntry.query('Amt').value('.', 'NVARCHAR(255)') AS Amt,
MY_XML.Ntry.query('AddtlNtryInf').value('.', 'NVARCHAR(255)') AS AddtlNtryInf
FROM (SELECT CAST(MY_XML AS xml)
FROM OPENROWSET(BULK 'C:\tmp\TestSqlSimple.xml', SINGLE_BLOB) AS T(MY_XML)) AS T(MY_XML)
CROSS APPLY MY_XML.nodes('Ntry') AS MY_XML (Ntry);
But don't know how to deal with that more complicated one. I've tried something like this and several similar attempts but I failed because it doesn't select anything, the result is nothing
SELECT
MY_XML.Ntry.query('Amt').value('.', 'NVARCHAR(255)') AS Amt,
MY_XML.Ntry.query('AddtlNtryInf').value('.', 'NVARCHAR(255)') AS AddtlNtryInf
FROM (SELECT CAST(MY_XML AS xml)
FROM OPENROWSET(BULK 'C:\tmp\TestSqlSimple.xml', SINGLE_BLOB) AS T(MY_XML)) AS T(MY_XML)
CROSS APPLY MY_XML.nodes('/Document/BkToCstmrStmt/Stmt/Ntry') AS MY_XML (Ntry);
Can't figure out what to do with that CROSS APPLY. Thank you very much for any suggestions or improvements, you're doing a great job

Answer 1

You were almost there.
(1) The XML file has a default namespace, and it needs a special treatment via XMLNAMESPACES clause.
(2) The Amt element probably has a numeric value so you could use DECIMAL(x,y) data type. But I kept the NVARCHAR(255) to match the obfuscated XML file example.
(3) The SQL below is using .value() method without unnecessary .query() method.
(4) It is a good practice to use elementName/text() technique for performance reasons. It is MS SQL Server specific peculiarity.
SQL
-- DDL and sample data population, start
DECLARE #tbl TABLE (
ID INT IDENTITY PRIMARY KEY,
Amt NVARCHAR(255),
AddtlNtryInf NVARCHAR(255)
);
-- DDL and sample data population, end
;WITH XMLNAMESPACES (DEFAULT 'urn:iso:std:iso:20022:tech:xsd:camt.053.001.02')
, XmlFile (xmlData) AS
(
SELECT TRY_CAST(BulkColumn AS XML)
FROM OPENROWSET(BULK 'e:\Temp\TestSqlSimple.xml', CODEPAGE = '65001', SINGLE_BLOB) AS x
)
INSERT INTO #tbl (Amt, AddtlNtryInf)
SELECT c.value('(Amt/text())[1]', 'NVARCHAR(255)') AS Amt
, c.value('(AddtlNtryInf/text())[1]', 'NVARCHAR(255)') AS AddtlNtryInf
FROM XmlFile CROSS APPLY xmlData.nodes('/Document/BkToCstmrStmt/Stmt/Ntry') AS t(c);
-- test
SELECT * FROM #tbl;

Answer 2

Something like this:
declare #doc xml = '<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:camt.053.001.02">
<BkToCstmrStmt>
<GrpHdr>
..........
</GrpHdr>
<Stmt>
<Ntry>
<Amt Ccy="EUR">RequestedAmount1</Amt>
<AddtlNtryInf>RequestedInfo1</AddtlNtryInf>
</Ntry>
<Ntry>
<Amt Ccy="EUR">RequestedAmount2</Amt>
<AddtlNtryInf>RequestedInfo2</AddtlNtryInf>
</Ntry>
<Ntry>
<Amt Ccy="EUR">RequestedAmount3</Amt>
<AddtlNtryInf>RequestedInfo3</AddtlNtryInf>
</Ntry>
</Stmt>
</BkToCstmrStmt>
</Document>';
with xmlnamespaces (DEFAULT 'urn:iso:std:iso:20022:tech:xsd:camt.053.001.02')
select s.Stmt.value('(GrpHdr)[1]', 'varchar(200)') GrpHdr,
n.Ntry.value('(Amt)[1]', 'varchar(200)') Amt,
n.Ntry.value('(AddtlNtryInf)[1]', 'varchar(200)') AddtlNtryInf
from #doc.nodes('/Document/BkToCstmrStmt') s(Stmt)
outer apply s.Stmt.nodes('Stmt/Ntry') n(Ntry)