>tcl-extension for postgreSQL.
>I'm currently using 7.0 and always getting a seg fault when I try to
>read from the database connection after issueing a "COPY table TO
>stdout;" (I'm using the connection handle, *not* the result handle).
>Maybe this is fixed in a later release.
>The README file in src/interfaces/libpgtcl tells me, that this should
>work, but unforunately it doesn't.

Yes, it seems broken. It is a bug in libpgtcl.  Are you running Tcl >= 8.3.2?
That's when the Tcl team changed the data structure for channel
callbacks.  The change itself was designed to be backward compatible, but I
suspect a related change made the code more sensitive to errors in the
structure (NULL pointers where functions are required).  Either that, or
nobody has tried to use libpgtcl with COPY in a long time.

First, I have to say I can't think of a good reason to use PostgreSQL's
COPY command from a Tcl application. I think it should only be used with
psql for importing data from another source into PostgreSQL, or for
exporting PostgreSQL data into another database (but why would anyone do
that?) If it was me, I would stick with SELECT and INSERT and be "SQL
Compliant".

OK, editorial is over. Try applying the patch below to fix
      src/interfaces/libpgtcl/pgtclId.c
and let us know if it works. I did little testing on it, but my test did
segfault before and ran fine (copy in and copy out) after the patch.  This
is for PostgreSQL-7.1.2 - since you are running older 7.0, I don't know if
this will work, but I suspect it will.

PS It's the absence of PgWatchProc which kills it. I didn't upgrade it
to the "V2" channel type structure, so it should be compatible with older
Tcl's. But aside from gets and puts, I doubt any other file operations
would work on the handle during a copy.

ljb

occur unconditionally, even if the rule should otherwise execute
conditionally.  This is more useful than giving an error, even though it's
not truly the correct behavior.  Per today's pghackers discussion.

the postmaster can kill the forked off processes when shutdown
is requested.

Jan

2) Keep FE/BE protocol more precisely.
3) Improve procedure calls.
4) A trial to avoid PREMATURE execution(#ifdef'd now).

Hiroshi Inoue

versions of gcc.  We don't really need to explicitly test the limits
anyway, just reverse-convert and see if we get the same answer.

coercing OID literals to OID in its queries.  Depending on the query
and the server version, this could cause failures for OIDs over 2 billion.

max_connections.

for them, and making them just wastes time during backend startup/shutdown.
Also, remove compile-time MAXBACKENDS limit per long-ago proposal.
You can now set MaxBackends as high as your kernel can stand without
any reconfiguration/recompilation.

>
>> On Mon, 3 Sep 2001 22:01:17 -0500, you wrote:
>>     public boolean isWritable(int column) throws SQLException
>>     {
>>         return !isReadOnly(column);
>>     }

Actually, I think this change has a consequence for this method
in the same class:

    public boolean isDefinitelyWritable(int column)
        throws SQLException
    {
        return isWritable(column);
    }

This is from the JDBC spec
(http://java.sun.com/j2se/1.3/docs/api/java/sql/ResultSetMetaData.html):

  isReadOnly() - Indicates whether the designated column is
definitely not writable.

  isWritable() - Indicates whether it is possible for a write on
the designated column to succeed.

  isDefinitelyWritable() - Indicates whether a write on the
designated column will definitely succeed.

At this time we don't really implement the fine semantics of
these methods. I would suggest the following defaults:

  isReadOnly()             false
  isWritable()             true
  isDefinitelyWritable()   false

And that would mean that your patch is correct, but
isDefinitelyWritable() would need to be patched accordingly:

    public boolean isDefinitelyWritable(int column)
        throws SQLException
    {
        return false;
    }

Again, both in jdbc1 and jdbc2.

Regards,
Ren? Pijlman <rene@lab.applinet.nl>

>public boolean isWritable(int column) throws SQLException
>{
>        if (isReadOnly(column))
>                return true;
>        else
>                return false;
>}

The author probably intended:

    public boolean isWritable(int column) throws SQLException
    {
        return !isReadOnly(column);
    }

And if he would have coded it this way he wouldn't have made
this mistake :-)

>hence, isWritable() will always return false. this is something
>of a problem :)

Why exactly? In a way, true is just as incorrect as false, and
perhaps it should throw "not implemented". But I guess that
would be too non-backwardly-compatible.

>let me know if i can provide further information.

Will you submit a patch?

Regards,
Ren? Pijlman <rene@lab.applinet.nl>

> new files). I'm attaching those two files below.
>
> Regards
> Mikhail Terekhov

Thanks. However, I seem to have left a single debug statement in there :-(

Here's a patch to remove it.

Vianen, Jeroen van

written a generic framework of rules that the contrib makefiles can
use instead of writing their own each time.  You only need to set a few
variables and off you go.

man page to the Programmer's Guide.