Question

everyone. This is a piece of code from using sqlite in android tutorial:

return db.update(employeeTable, cv, colID+"=?", 
new String []{String.valueOf(emp.getID())});  

I don’t understand why in colID+"=?" after ‘=’ stay ‘?’

Anyone can explain this, please?

Thanks for everyone!

Answer 1

This is a Prepared Satatement. In this case, you can define a query as a template and left some parameters to fill dynamically. You represent the parameter with an ?.
In your case, you are indicating that String.valueOf(emp.getID()) will substitute the ?.