Re: Should clients warn in case of server version mismatch

I had problem such this. I've got 8.1.3 client and 8.0.6 server. But
psql 8.1.3 warned me, that some \? functions can not work properly. I've
resolved this problem in very simply way. I got binary psql from 8.0.x
and run. Psql program is a client program, that uses libpq library, so
it is (I think) no difference until the libpq includes correct and
enough routines to call them from psql. I've tested for example my own
application compiled with 8.1.3 libpq on 7.4.8 libpq, or compiled with
8.0.7 on 8.1.3. But the not use functions, like \?. No problems. But the
\? functions in psql are implemented (I think) in other way and are
version specific, becouse the consttruction of information part of
database is not compatible between versions 8.0.x and 8.1.x and 8.2.x
(the first two numbers of a version are signifficant in this case).
Brgds
Adam

Rajesh Kumar Mallah wrote:

> Hi,
>
> We connected psql 8.2.0 accidently to postmaster ver 8.1.5.
> \d tablename does not work.
>
> should psql at least warn like pg_dump does in case
> of such client server version mismatches ?
>
> regds
> mallah.
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>       choose an index scan if your joining column's datatypes do not
>       match
>
>