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In DBMSs like Oracle, even MySQL or PostgreSQL have similar concepts, you have cases where multiple schemas/databases exist. Netbeans has no option to allow you to reverse engineer entities from these schemas/databases unless you connect as these users.
I'm not sure what is the issue here, but looks more like enhancement. Do you mean you need first to create connection but want to omit this step? Or want to create entities from several databased at once?
Yes, enhancement sorry. Hibernate has a similar feature with their reveng XML file, you can specify schema filters, table filters, etc. Not sure if netbeans is just delegating down to eclipselink to do this or not, but what would be ideal is if the UI would allow me to pick a schema and show tables under that schema rather than only allowing user's schema.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss