Isn't it more about when to initially *open* the connection than about when and whether to close it?

No, neither are issues about which you would even think one minute: you always keep your connection open as short as possibly. Which means, open late, close early. It is ludicrous to optimize this because of licensing issues, instead of best practices ;-)

Maybe the database vendor is just encouraging best practices by licensing based on concurrent open connections ;)

FYI, NHibernate has been doing the same since 1.2

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