Extracting data from xml in SQL query

Question

I'm trying to query the SQL 2008R2 database Surveillance and extract the MacAddress value from this XML Column Settings in the table Hardware I'm brand new to SQL queries but quickly learning. Any suggestions would be GREATLY appreciated.

<properties>
  <settings hwid="hardware">
    <setting typeid="DAF813F8-2E02-4AE5-9F0F-B0FB203D3CB6">
      <name>ProductID</name>
      <value>AxisP3301</value>
    </setting>
    <setting typeid="F9D27CE8-8FA9-4B91-8C85-3E80DE7EF0AB">
      <name>MacAddress</name>
      <value>00408CC3ABCF</value>
    </setting>
    <setting typeid="FC714851-E998-4738-A140-F4FF20E99DEB">
      <name>FirmwareVersion</name>
      <value>5.40.9.2</value>
    </setting>
    <setting typeid="F1DED00E-9614-475F-A6F7-BA29FCA8DE39">
      <name>SerialNumber</name>
      <value>00408CC3ABCF</value>
    </setting>
    <setting typeid="5BE128A3-BDEC-4FEE-8690-D575DF03E3EE">
      <name>Bandwidth</name>
      <value>Unlimited</value>
    </setting>
    <setting typeid="188A93DE-67D8-417E-BCFC-FF5B3F74434A">
      <name>AudioEncoding</name>
      <value>G711</value>
    </setting>
    <setting typeid="5ADCDA37-78B3-4AB9-93E5-966EDE722FA3">
      <name>AlertEventServerIP</name>
      <value />
    </setting>
    <setting typeid="922AAF32-821A-4E24-A646-72A4AE592364">
      <name>AlertEventServerPort</name>
      <value>0</value>
    </setting>
    <setting typeid="18BF9B14-D675-40A1-B57D-90A03272468A">
      <name>SmtpEventServerIP</name>
      <value />
    </setting>
    <setting typeid="5F614912-4C46-453E-9043-3BFC15321E56">
      <name>SmtpEventServerPort</name>
      <value>25</value>
    </setting>
    <setting typeid="9F739984-A2C0-4E09-AAB6-97F229E9F208">
      <name>InternalEventServerIP</name>
      <value>25</value>
    </setting>
    <setting typeid="59094737-81C6-4FC2-B748-0005C390A775">
      <name>AttachmentSavePath</name>
      <value />
    </setting>
    <setting typeid="AF8875BC-7B45-4EBC-92DC-4E3959810A2E">
      <name>InternalEventServerPort</name>
      <value />
    </setting>
    <setting typeid="2B22F067-7AA4-4486-A206-85CBE3BE3285">
      <name>HTTPSPort</name>
      <value>443</value>
    </setting>
    <setting typeid="DA6E7891-54FA-4902-8164-75A790C11F17">
      <name>HTTPSEnabled</name>
      <value>no</value>
    </setting>
  </settings>
</properties>

Answer 1

You can use function value() and correct XQuery to get the result you need:

SELECT Settings.value('(/properties/settings/setting[name="MacAddress"]/value/text())[1]', 'varchar(255)') as MacAddress 
FROM Hardware

Here you find the setting element that has child element name with value MacAddress and take the text of its child element value. When using value() function you need to provide the data type, so it is provided as varchar(255) in this case.

Here is a link to SQL Fiddle