SQL equivalint of #incude directive ?

I thought this would be common. But a quick Google only revealed what look to be
workarounds.

I am defining a bunch of functions, and I would prefer to store them in a
separate file, which then gets "source" by the main DB init file.

Is there a standard way to do this?

--
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
                        -- Benjamin Franklin