SQL Server: bulk insert node into xml joined to another table - sql-server

Question

I've googled but can't find a good example of this.
I have a #temp table with an pk ID and decimal column
ID decimal
2 0.34
3 0.1
I have another table called master having a column with the same pk and an xml column like:
Master
ID xml
2 <Form ....
3 <Form.....
I need to insert a new node into the xml that has its element name as the decimal value. All which have the same element name and at the same level.
The xml on a basic level looks like:
<Form formCode="123">
<Node1>234</Node1>
<Node2>234</Node3>
</Form>
And I want the final xml to look like:
<Form formCode="123">
<Node1>234</Node1>
<Node2>234</Node3>
<NewNode>0.34</NewNode>
</Form>
I think it should be something like:
UPDATE Master
SET
xml.modify('insert /Form/'...followed by some kind of join.

Answer 1

Try something like this
DECLARE #tbl TABLE(ID INT, decimalColumn DECIMAL(4,2));
INSERT INTO #tbl VALUES
(2,0.34)
,(3,0.1);
DECLARE #master TABLE(ID INT, xmlColumn XML);
INSERT INTO #master VALUES
(2,
'<Form formCode="123">
<Node1>234</Node1>
<Node2>234</Node2>
</Form>')
,(3,
'<Form formCode="456">
<Node1>234</Node1>
<Node2>234</Node2>
</Form>')
UPDATE #master SET xmlColumn.modify('insert sql:column("NewNode.AsXml") as last into /Form[1]')
FROM #master AS m
INNER JOIN #tbl AS tbl ON tbl.ID=m.ID
CROSS APPLY(SELECT CAST(tbl.decimalColumn AS VARCHAR(MAX)) FOR XML PATH('NewNode'),TYPE) AS NewNode(AsXml);
SELECT * FROM #master
The result
2 <Form formCode="123"><Node1>234</Node1><Node2>234</Node2><NewNode>0.34</NewNode></Form>
3 <Form formCode="456"><Node1>234</Node1><Node2>234</Node2><NewNode>0.10</NewNode></Form>

Answer 2

Use UPDATE ... FROM and the sql:column function:
DECLARE #temp TABLE (id int, d decimal(10,2));
DECLARE #master TABLE (id int, x xml);
INSERT #temp
VALUEs (2, 0.34),(3,.1);
INSERT #master
VALUES (2, '<Form><Test /></Form>'), (3, '<Form><Test /></Form>')
UPDATE m
SET x.modify('insert <NewNode>{sql:column("d.d")}</NewNode> after (/Form/Test)[1]')
FROM #master m
INNER JOIN #temp d
ON m.id = d.id
SELECT * FROM #master