Loop Through Collection of XML Records in SQL - sql

Question

I have a dataset that looks like this:
<?xml version="1.0" encoding="utf-8"?>
<process xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<return>
<approved>
<callbackTable>
<tableRow max="100" value="10" selectedRow="true" maxRow="112.0">
<tableCell term="72" selectedCell="false" maxCell="73">
<number>21.7</number>
</tableCell>
<tableCell term="74" selectedCell="true" maxCell="75">
<number>21.7</number>
</tableCell>
</tableRow>
<tableRow max="200" value="15" selectedRow="false" maxRow="113.0">
<tableCell term="76" selectedCell="false" maxCell="77">
<number>14.5</number>
</tableCell>
<tableCell term="78" selectedCell="false" maxCell="79">
<number>22.5</number>
</tableCell>
</tableRow>
<tableRow max="300" value="20" selectedRow="false" maxRow="114.0">
<tableCell term="80" selectedCell="false" maxCell="81">
<number>14.6</number>
</tableCell>
<tableCell term="82" selectedCell="false" maxCell="83">
<number>15.7</number>
</tableCell>
</tableRow>
</callbackTable>
</approved>
</return>
</process>
I need to be able to loop through the callbackTable entries and add them to a table named Options.
Here is what I need the data to ultimately look like in the Options table.
Id
Max
Value
SelectedRow
MaxRow
Term
SelectedCell
MaxCell
Number
1
100
10
true
112.0
72
false
73
21.7
2
100
10
true
112.0
74
true
75
21.7
3
200
15
false
113.0
76
false
77
14.5
4
200
15
false
113.0
78
false
79
22.5
5
300
20
false
114.0
80
false
81
14.6
6
300
20
false
114.0
82
false
83
15.7
(Note that the Id column is an identity key and does not need to be populated)
The tricky part is that I don't know exactly how many rows or how many cells are in the callbackTable collection so I will need to loop through the results and insert based on the number of items in the collection.
I could really use some help as I'm not entirely sure where to start.
Thanks in advance!

Answer 1

If you can change the encoding in the XML processing instruction to utf-16 or omit it, try the set-based query below. Note the Id column of the target table is omitted from the column list so that SQL Server will assign the IDENTITY value.
DECLARE #xml xml =
<process xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<return>
<approved>
<callbackTable>
<tableRow max="100" value="10" selectedRow="true" maxRow="112.0">
<tableCell term="72" selectedCell="false" maxCell="73">
<number>21.7</number>
</tableCell>
<tableCell term="74" selectedCell="true" maxCell="75">
<number>21.7</number>
</tableCell>
</tableRow>
<tableRow max="200" value="15" selectedRow="false" maxRow="113.0">
<tableCell term="76" selectedCell="false" maxCell="77">
<number>14.5</number>
</tableCell>
<tableCell term="78" selectedCell="false" maxCell="79">
<number>22.5</number>
</tableCell>
</tableRow>
<tableRow max="300" value="20" selectedRow="false" maxRow="114.0">
<tableCell term="80" selectedCell="false" maxCell="81">
<number>14.6</number>
</tableCell>
<tableCell term="82" selectedCell="false" maxCell="83">
<number>15.7</number>
</tableCell>
</tableRow>
</callbackTable>
</approved>
</return>
</process>';
INSERT INTO dbo.TargetTable([Max],[Value],[SelectedRow],[MaxRow],[Term],[SelectedCell],[MaxCell],[Number])
SELECT
tableRow.value('data(./#max)', 'varchar(10)')
,tableRow.value('data(./#value)', 'int')
,tableRow.value('data(./#selectedRow)', 'varchar(10)')
,tableRow.value('data(./#maxRow)', 'decimal(10,1)')
,tableCell.value('data(./#term)', 'int')
,tableCell.value('data(./#selectedCell)', 'varchar(10)')
,tableCell.value('data(./#maxCell)', 'int')
,tableCell.value('./number[1]', 'decimal(10,1)')
FROM #xml.nodes('//tableRow') AS tableRow(tableRow)
CROSS APPLY tableRow.nodes('//tableCell') AS tableCell(tableCell);