如何从 sql 服务器中的 XML 生成特定表？

Question

I have a xml document. I want to generate table with this xml. Here is my xml data

Declare @Result XML
SET @Result='
<General>
  <Customer>
    <model_year>2011</model_year>
    <vehicle_id>1</vehicle_id>
    <customer_requests>
      <request>
        <definition>I want to new car tyre</definition>
      </request>
      <request>
        <definition>I want to new headlight</definition>
      </request>
    </customer_requests>
    <mileage>34000</mileage>
  </Customer>
  <Customer>
    <model_year>2012</model_year>
    <vehicle_id>2</vehicle_id>
    <customer_requests>
      <request>
        <definition>I want to general maintenance</definition>
      </request>
    </customer_requests>
    <mileage>35000</mileage>
  </Customer>
</General>
'

This is sample output

model_year	vehicle_id	request	mileage
2011	1	I want to new car tyre,I want to new headlight	34000
2012	2	I want to general maintenance	35000

How can I generate table from XML data like sample output with tsql?

Answer 1

Please try the following solution.

It is using XQuery's FLWOR expression to concatenate multiple <definition> tag values into one string.

SQL

DECLARE @Result XML = 
N'<General>
  <Customer>
    <model_year>2011</model_year>
    <vehicle_id>1</vehicle_id>
    <customer_requests>
      <request>
        <definition>I want to new car tyre</definition>
      </request>
      <request>
        <definition>I want to new headlight</definition>
      </request>
    </customer_requests>
    <mileage>34000</mileage>
  </Customer>
  <Customer>
    <model_year>2012</model_year>
    <vehicle_id>2</vehicle_id>
    <customer_requests>
      <request>
        <definition>I want to general maintenance</definition>
      </request>
    </customer_requests>
    <mileage>35000</mileage>
  </Customer>
</General>';

SELECT c.value('(model_year/text())[1]', 'CHAR(4)') AS model_year
    ,  c.value('(vehicle_id/text())[1]', 'INT') AS vehicle_id
    ,  c.query('for $x in customer_requests/request/definition
                return if ($x is (customer_requests/request[last()]/definition)[1]) then data($x)
                        else concat($x/text()[1], ",")')
        .value('text()[1]', 'VARCHAR(MAX)') AS request
    ,  c.value('(mileage/text())[1]', 'INT') AS mileage
FROM @Result.nodes('/General/Customer') AS t(c);

Output

+------------+------------+-------------------------------------------------+---------+
| model_year | vehicle_id |                     request                     | mileage |
+------------+------------+-------------------------------------------------+---------+
|       2011 |          1 | I want to new car tyre, I want to new headlight |   34000 |
|       2012 |          2 | I want to general maintenance                   |   35000 |
+------------+------------+-------------------------------------------------+---------+