Dynamic update query ?

[vjau]

I am quite new to SQL and PGTyped.
What is the correct pattern if i want to update records in a table with five columns ?
Do i have to create a function for each one of the five columns ?
I have tried to use a parameterized column name in my UPDATE statement, but it doesn't seem to be accepted by the pgtyped compiler (probably because of dangerous construct).
What are my options ?

Thank you