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POSQL Server 2005 Querying XML column Data
 

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    <p>I have a table called <code>People</code> with a columns of datatype <code>xml</code> called <code>properties</code>. I've used this to store random information about each person basically allowing people to store any extra data that are added in the future without a database redesign. Not all people will have the same elements in their xml. </p> <pre><code>CREATE TABLE [dbo].[Person]( [PersonID] [bigint] IDENTITY(1,1) NOT NULL, [PersonType] [nvarchar](50) NULL, [Title] [nvarchar](5) NULL, [Forename] [nvarchar](60) NULL, [Surname] [nvarchar](60) NULL, [Company] [nvarchar](60) NULL, [Properties] [xml] NULL ) </code></pre> <p>An example of the xml is:</p> <pre><code>&lt;PropertyList xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt; &lt;Property Name="Class"&gt;Class A&lt;/Property&gt; &lt;Property Name="CarRegistration"&gt;123456&lt;/Property&gt; &lt;Property Name="MedicalNotes"&gt;None&lt;/Property&gt; &lt;/PropertyList&gt; </code></pre> <p>First question is I can't seem to find a SQL query that will allow me to get a list of records that match criteria stored in the xml. </p> <p>For example how would i get all records where the <code>Class="Class A"</code>. I've tried :</p> <pre><code>SELECT PersonID, Properties.value('/PropertyList/Property[@Name="Class"][1]','nvarchar(50)') FROM Person </code></pre> <p>I know this is incorrect but I get the error "requires a singleton (or empty sequence)" and I'm not quite sure whats gone wrong.</p> <p>And second side question is I've combined several older databases into a single person list however the old database frontends still need to access their bit of the data. My plan was to create a view for each database frontend with a layout specific for its needs all linking back to the main people table. However some of their fields are now stored in the XML. Is there any way of creating a view to update the XML without seeing the xml i.e. so it looks and acts just like a view on any other table. I hope i explained that correctly. For each view I will have a specific set of XML properties I need them to edit and all records will have them so its not so random. </p> <p>Thanks for any help.</p>
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