Dynamic jdbc connection string

Hi!

First of all, thank you for the Beaker project. I've been regularly using it for a few years and I'm now giving a try to the modern BeakerX.

When in SQL language, I create a connection via jdbc using the %defaultDatasource magics. Although the connection itself works fine (i.e. I can retrieve the data from the database), my jdbc connection string contains sensitive information (i.e. login/password) which I would prefer not to save as plain text in the notebook.

So I wonder whether there is away to dynamically construct a jdbc connection string and feed it to the %defaultDatasource magic, by analogy with how the "%classpath add dynamyc" magic works.

Overall, your advice on how to avoid storing credentials in plain for custom jdbc connections in BeakerX is much appreciated.

Thanks!