Java-check if user is already registered for lesson

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Hi guys,

I am trying to check if the user which tries to register for a lesson is already registered for this lesson.

For example, a user tries to log on for the same lesson again, how can I check this?
The informations are stored in a database. I have a table with one column for the user and one for the lesson I want to show a message box if the same data is already stored in the database.

I tried something like

Quote:
modelStudÜbersicht.setRowCount(0);

But I think that's not the right way to solve this. I think I have to SELECT all data in a new query..?

thx all in advance

What I have tried:

Quote:
I tried something like
Quote:
modelStudÜbersicht.setRowCount(0);

Posted 7-Jul-18 0:17am

Member 13814158

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Richard MacCutchan 7-Jul-18 8:10am

You first need to query the database to see if there is an entry for that user with the requested lesson. If there is no entry then you should insert or update the user entry. If the entry already exists then take whatever action is required to reject the request.

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