uni no affect but if u going for govt. job, it will be an issue,
maybe fudgester may verify my latter point.
Huh? Why me? I haven't been to DB leh..... 
All I'm saying is, I've read quite a few instances of outright
criminals entering and being accepted into local universities. And
I'm talking about crimes like burglary and sex offences. So
following this thread of reasoning to its logical conclusion, DB
should not really be a factor in university admission.
That said, it can be a black mark on your NS record,
which may not reflect well on prospective employers. Of course,
that would depend on the type and seriousness of the offence you
were tossed into DB for.
For instance, getting tossed into DB for long-term AWOL reflects
more badly than getting tossed in for speeding in your
5-tonner....