For me the problem is not solved on TYPO3 4.5.2, and it's not clear to me, if it should (deleted target-version here, but not in the 'old' bugtracker).
It costed me hours to find out why a fresh install of TYPO3 suddenly isn't able to connect to database - and i use typo3 now for 8 or 9 years! ...
What did I do:
- I used a 'package' which i bundled myself some time ago, with all necessary extensions, typoscript and templates inside, a sql file for importing my common users , ... etc etc pp... and copied to my new webhost.
I do this on a very regular basis!
- as in the 'clean' localconf I use as a 'template' for fresh install, no database information is available the 123 mode appears on first call of installtool (via /typo3/install); anyway I delete the 123-mode thing from url to get to the installtool directly.
-> now i'm not able to get a simple db-connection until I recognize that dbal and adodb activated themselves on the very first call of this 123-mode thingy.
realy bad, as i never would think about 'selfinstalling' extensions and therefore searched the error on many different places except in the extlist in localconf.php ...
probably a checkbox in installtool and 1-2-3 mode 'use dbal', or 'use-mysql' or something like this would be great.