My experience is there are no non-commercial JDBC drivers out there for MSSQL which are really good enough for a production system. Of the commercial ones Data Direct's offering is pretty good. Of the open source ones jTDS is nearly there, and far better than MS's own offering.
We've had bitter experience with MS's JDBC Driver and it's aweful. On high traffic sites, it brings the application server to it's knees pretty quick.
We're using JTDS and haven't looked back.
Joined: Aug 19, 2004
Microsoft driver is pretty bad. So much so that if you try and prepare two statements on the same connection object it will implicitly open another connection! JTDS driver isnt bad and its free but I have faced few issues with it while working on time stamp fields. Data direct is good and so J SQL Connect. See what fits your needs.