@stringer.popov Your issue here is the syntax of your INSERT. You are trying to insert data into 3 columns but only specifiying 2 values, hence the error “Column count doesn’t match value count”.
If you look closely you specify the columns as: (name,surname,age) but then in values you only give 2 question marks (?,?). You need to specify 3 values (?,?,?) and this error will go away.