Frame:SetManyAttributes

This is a user-defined function that you can copy and paste into your addon.

Small function to be attached to secure frames to allow for setting many attributes in a single call.

local function SetManyAttributes(self, ...)
	for i=1,select("#", ...),2 do
		local att,val = select(i, ...)
		if not att then return end
		self:SetAttribute(att,val)
	end
end

Example

local frames = {}

for i=1,12 do
	frames[i] = CreateFrame("Button", nil, UIParent, "SecureActionButtonTemplate")
	frames[i].SetManyAttributes = SetManyAttributes
end

frames[1]:SetManyAttributes("type1", "macro", "macrotext", "/equip Hydrocane")
frames[2]:SetManyAttributes("type1", "spell", "spell", "Greater Heal")

Or to just use the function on a random frame:

 SetManyAttributes(someFrame, "type1", "macro", "macrotext", "/equip Hydrocane");