InsertCommand.py

class InsertCommand:
    def __init__(self, db, name, email, phone, address, service, joining_date, travel):
        self.db = db
        self.name = name
        self.email = email
        self.phone = phone
        self.address = address
        self.service = service
        self.joining_date = joining_date
        self.travel = travel

    def execute(self):
        if not all([self.name, self.email, self.phone, self.address, self.service, self.joining_date, self.travel]):
            raise ValueError("Missing required parameter")
        if not self.phone.isdigit() or len(self.phone) != 10:
            raise ValueError("Invalid phone number")
        self.db.insert(self.name, self.email, self.phone, self.address, self.service, self.joining_date, self.travel)