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POWhich design pattern for Activity Logging (Audit Trailing)
 

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  1. POWhich design pattern for Activity Logging (Audit Trailing)
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    <p>I have a winform which allows people to edit data from a database, to simplify things assume there is a Customer table in database with 3 fields - Name, City, Country. Through winform(s) people can Add/Edit/Delete customers.</p> <p>For each of these actions we need to save:</p> <ol> <li><p>What the field names are (Name,City,Country in this case)</p></li> <li><p>What the field values were before they were modified</p></li> <li><p>What the field values are after they are modified.</p></li> </ol> <p>If the action is Add or Delete then 2 and 3 will be the same.</p> <p>I have already implemented this using XMLSerialisation (but not using any of the design patterns) and my XML output looks like this.</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;ActivityItem xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt; &lt;UserID&gt;26&lt;/UserID&gt; &lt;FormTitle&gt;frmCustomer&lt;/FormTitle&gt; &lt;Action&gt;Edit&lt;/Action&gt; &lt;Area&gt;Customers&lt;/Area&gt; &lt;TrackedActivity&gt; &lt;FieldNames&gt; &lt;string&gt;Name&lt;/string&gt; &lt;string&gt;City&lt;/string&gt; &lt;string&gt;Country&lt;/string&gt; &lt;/FieldNames&gt; &lt;PreValues&gt; &lt;string&gt;CompA&lt;/string&gt; &lt;string&gt;London&lt;/string&gt; &lt;string&gt;UK&lt;/string&gt; &lt;/PreValues&gt; &lt;PostValues&gt; &lt;string&gt;CompB&lt;/string&gt; &lt;string&gt;Manchester&lt;/string&gt; &lt;string&gt;UK&lt;/string&gt; &lt;/PostValues&gt; &lt;/TrackedActivity&gt; &lt;DateTimeStamp&gt;2012-06-15T10:16:18&lt;/DateTimeStamp&gt; &lt;/ActivityItem&gt; </code></pre> <p>The solution can handle different areas of the system with different number of fields (i.e the same thing works when you are modifying Products for instance).</p> <p>My question is, is there a well defined design pattern to deal with this kind of behavior?</p> <p>Many Thanks</p>
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