Today I found that I made a mistake in the project. This often happens on the same page. After the customer clicks the button, ProgramDetermine whether this record exists. If yes, perform update; otherwise, insert. At that time, in order to save time, a viewstate is saved in the page to record whether the existence of the record exists, and the user thinks that the database is not checked once. However, you should jump out of this page after you forget the operation is successful, and a problem occurs. When you enter this page, the first operation saves the status of the record to be added and continues to save, because the page is not displayed, the program remains added.
Think about this error. You can try the following methods in the future:
1. Delete the original record and add it again
2. determine at the business layer whether to add
3. jump out of the interface after the operation is successful
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