Can't Add New Record

follow the training video , i created the phonebook application, and after do all need to do, update and delete record function is OK, but when i add a new record, the record isn't added to DB, i don't know why, dose persional env disable the add new record function? or other reason?
Hi Han,

Can you give us a small example of your application? It may be the case that there is an error, and the record isn't being added to the database. By providing us with an example, we may be able to troubleshoot your problem more accurately.

Ricardo Alves