How do you write a file involving the changes in application engine?

Hi Guys,
I have a requirement in app engine.
I have to update a table based on the changes occured in other tables.
I have to show the user old value and new updated value in the log file how do I write a file for below fields?
Old Value: Name:Rock|SSN:0000000|Address:675478
New Value Name: Roger|SSN:0000000|Address:908765
Thanks and regards,

Hi ,
My Requirement is Quite different here.
I cannot use CI.i have to implement in app engine.
Below explained:
I have data coming from abc table and populating into xyz table.
So if any field in abc gets changed which is extracted and populated in the xyz table.I have to show the old field value of xyz and the new field values of abc which I am going to insert into the xyz.
My log file should have both the values.
how do I write both the values and update it:
say I have value from abc.id=12 and xyz.id=12
when we update abc.id=13 and xyz.id=14
I have to print
old record details:
id=12
New record details:
id=13
somerthing of above sort
Thanks and Regards

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