How to serialize a record / row in SQL?
I feel my answer may lack what you are looking for but with out more context here are a couple options:


Use the mysqldump command.  

mysqldump -u user -pPassword   --no-create-db --no-create-info --where="primary_key=N"


will give you a sql insert command which you can use to reconstruct that row.  


run a query like

select * into outfile '/tmp/rowdump.data' from table where primary_key=N


This will create a file /tmp/rowdump.data in tab separated format.  This can be reimported with

load data infile '/tmp/rowdump.data' into table `table`;


If these don't suit your needs please elaborate on your use case on what you are trying to accomplish.