The Cockroach in class practice

Title: Program crashes when you install a program on a new phone

Resolution: 1, find the error: After a series of tests, found that the problem occurred in the first time access to the database code times wrong. The reason for the error is that the established tables in the database cannot be discovered.

2, how to solve: in the main page to join the Access database statement.

Title: The date selected by the user cannot be returned when the date is selected.

Resolution: 1, find out the error: the error is because the calendar interface after the date of the selection of the value of the database record does not match the date format (the database deposit date format is xxxx-xx-xx, the actual calendar selection month and day less than 10 o'clock the incoming format becomes xxxx-x-x), causing the query to fail, throw an error.

2. How to FIX: Change the date format for delivery

The Cockroach in class practice