Provides the SQL used to insert a customer object into the database.
Customer cust = (Customer)p; // Cast it to a Customer
int cust_id = cust.getId(); // The customer id
String last = cust.getLastName(); // The last name
String first = cust.getFirstName(); // The first name
// INSERT INTO t_customer (cust_id, last_name, first_name)
// VALUES (1, 'the Clown', 'Bozo')
return "INSERT INTO t_customer (cust_id, last_name, first_name) " +
"VALUES (" + cust_id + ", '" + last + "', '" + first +
"')";