The 6th level spell Transformation gives you a fighters BAB as you mention, but I do not think it is available to any type of cleric. I cannot find any other spell that does that.
As to the spell list, I am afraid I am not familiar enough with the Pathfinder cleric to give much advice. Enlarge Person always seemed to work for other clerics
I think the spell you're thinking about is Divine Power... in 3.5 it did exactly that AND granted a +6 enhancement bonus to STR. However, Paizo obviously thought this was a bit too powerful for a 4th level spell (and I don't blame them), so they changed it a bit. Divine Power is still a good spell for melee clerics - just not as ridiculously powerful as it was in 3.5. Other good spells for melee clerics are Righteous Might, Blessing of Fervor (every cleric should use that spell), and Divine Favor. Clerics also have some good spells for melee combat that can REALLY save money on gear costs... Magic Weapon, Magic Vestment, Shield of Faith, and Bull's STR are some examples. Again, these spells give the same bonuses as typical melee gear, so take your pick.
I think the spells you need are Divine Favor and Divine Might. There was a divine equivalent to Transformation (I think called Divine Power) in 3.X, but Pathfinder seems to have removed it. Divine Might is your best bet for now since its luck bonus should catch you most of the way up to a full BAB in terms of to hit bonuses and it gives you a haste attack.
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Depending on your Magic Items:
Shield of Faith
Blessings of Fervor
Bulls Strength
Enlarge Person
Bless
Weapon of Awe
Disrupting Weapon (against Undead)
Align Weapon (against Outsiders)
Righteous Might
Divine Power
Heroes Feast
Mighty Strength
Holy Sword
Magic Vestment
Stone Skin
Rage
This is in no order but as I thought of them.
The spell your talking about is probably Divine Power. It doesn't give you a full BAB but might as well. Combine with Righteous might, stone skin and weapon of Awe for a melee fighter that will rival the Barbarian/fighter.
Oh, there's also Righteous Might. It's basically a powered up Enlarge Person that is self only.
Am I invisible in these threads... or do people like to just ignore an undead face? :p And this isn't the first time, either. :( *goes back to the crypts*
Um...with Divine Power being changed to provide a Luck bonus to attack and damage, there's no use for Divine Favor if you're using DP, as they won't stack. DP is now DF+, gaining bonuses to Str checks, Str-based skill checks, temporary HP and an extra attack.