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Re: Appending XML to File

• To: Alan Gutierrez <alan-xml-dev@e...>
• Subject: Re: Appending XML to File
• From: david.lyon@c...
• Date: Tue, 18 Jan 2005 21:57:30 +1100
• Cc: xml-dev@l...
• In-reply-to: <20050118075711.GA22606@m...>
• References: <20050118075711.GA22606@m...>
• User-agent: Internet Messaging Program (IMP) 3.2.6

Hi Alan,

> I was wondering if anyone had used XML in a logging context.

To answer the question, I believe that you will find a
good way to manage the data is to store it into a SQL
database in a memo field, along with a datetime entry
stamp and a unique row id.

This will take care of:

 - concurrency issues, if you need it to work from
   multiple machines.

 - programming time, design/code/debugging of what
   is a deceptively simple task (aka all I want is a
   simple system that just...)

 - performance. A free db like mysql might be good
   for a small budget. Consider other products if you
   have more to spend.

 - maintenance and querying. Very easy with sql and
   you get a good choice of languages.

>     Have you wanted to append XML to file, or store XML events to
>     file? How did you do this and manage to keep the document well
>     formed?

I don't know how fast you need the logging to be, your spec didn't
say. What we do to keep it really fast is make sure it can go
in a single TCP/IP packet... and use our whacky compact and fast
xml encoding. ie

EventType&="LogMessage" MachineName&="HP-EPC" LogMessage&="Processing complete"

or go the normal way with something like this:

 <LogEntry>
  <EventType>LogMessage</EventType>
  <MachineName>HP-EPC</MachineName>
  <LogMessage>Processing complete</LogMessage>
 </LogEntry>

Then you save that into the database.

Best Regards

David



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