[Lazarus] What is a TSQLTransaction and why do I need one?

[zeljko]

>
> I think we should not change a thing, until the problem is clear. Maybe
> we can come up with some 'general' transaction-isolation levels. The
> reason they are not implemented in a general way is that each DB has
> it's own locking-style.

Here is nice explanation of isolation levels, "general" transaction-isolation 
levels should be implemented definitelly.
http://en.wikipedia.org/wiki/Isolation_%28database_systems%29

zeljko