How to register events posted from Firebird with parameters in Delphi?

You could read the usernames from the user table (if new. Username is actually a field and not some FB system value) and create the eventalerters components dynamically, one per user name.

Since events don't really support parameters, one way would be to add extra fields to table, which contain auto incremental id (or timestamp) and the data you need as a parameter.

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