On Wed, Feb 27, 2008 at 4:04 PM, Peter Bex <[EMAIL PROTECTED]> wrote: > On Wed, Feb 27, 2008 at 02:47:14PM -0600, Jeremy Sydik wrote: > > dbi:query-fold, dbi:query-map, query-for-each. I thought about > > implementing these, but I > > haven't been able to think of the use case that makes them necessary > > in the presence > > Scheme's fold, map, and for-each, other than as shorthand (which > > could be define'd > > in place in a heartbeat for anyone who wants it) > > No. If you want to look at a result set that consists of several hundred > binary blobs of megabytes each, you most certainly don't want to implement > this as a "fetch all into one list" operation. You would want to load in > one row, handle it, then take the next, etc.
At the driver level, LOBs are often handled with a stream-based interface. For an LOB, I'd suggest representing it with a a thunk which, when evaluated, returns an input stream, Chicken blob or a string. That would allow you to inspect the other column values before deciding whether to evaluate the LOB. G _______________________________________________ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
