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From: Guy Dupont <dupont@info.polymtl.ca>
To: postgres@postgres.Berkeley.EDU
Subject: moving in a portal
Date: Thu, 18 Aug 1994 16:09:24 -0400 (EDT)
Message-ID: <Pine.3.89.9408181647.D4317-0100000@de-morgan> (raw)

I have some problems with the command fetch. 

I want to count the number of instance in my portal.  

So I make a first fetch to go to the last instances and get the number 
of instance.  But if I fetch backward to return to the beginning of the 
portal, i get nothing and all other fetch in one or the other direction 
will return nothing.  I join an example of it.

It seems to me that there is a problem when an extremite of the portal 
is get.

Can somebody has experienced a similar problem ?

Thank Guy,

Here is the example:


Welcome to the POSTGRES terminal monitor

Go 
* 
Query sent to backend is "begin "
BEGIN
Go 
* 
Query sent to backend is "retrieve portal myportal (pg_user.usename) "
RETRIEVE
Go 
* 
Query sent to backend is "fetch all in myportal "
---------------
| usename     |
---------------
| postgres    |
---------------
| nouveau     |
---------------
| pfeadm      |
---------------
| dupont      |
---------------

Go 

--> It's ok until now but:

* 
Query sent to backend is "fetch backward all in myportal "
---------------
| usename     |
---------------

--> I get nothing evan when I want to return to the begining.
Go 
* 
Query sent to backend is "fetch all in myportal "
---------------
| usename     |
---------------

--> still nothing
Go 
* 
Query sent to backend is "fetch backward all in myportal "
---------------
| usename     |
---------------

Go 
* 
Query sent to backend is "end "
END
Go 
* 







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