Re: cursor "x" does not exist

[rob stone]

Hello Bob,

On Sat, 2018-04-14 at 15:44 +0100, Bob Jones wrote:
> Hello,
> 
> 
> 
> P.S. As a side-question, if anyone here has experience in using
> Postgres as a backend to PHP, are refcursors the way to go or should
> I
> be thinking of SETOF or other return styles ?
> 


If you have a business requirement along the lines of "display all
outstanding orders for a customer" it is best to create a view that
serves that purpose. Then all you need to code is a "select * from
v_outstanding_orders where customer_id = $1";
If there are any outstanding orders you can page through the
associative array returned by the query in order to display the
results.

HTH,
Rob

Re: cursor "x" does not exist

[Adrian Klaver]

On 04/14/2018 09:36 AM, Bob Jones wrote:

On 14 April 2018 at 16:38, Tom Lane  wrote:

Bob Jones  writes:

My apologies if I'm being incredibly stupid here, but I've reviewed
what the docs have to say about naming portals and I still can't see
where I'm going wrong here ?


I think you're forgetting to double-quote an upper case identifier.


FETCH ALL IN B;
ERROR:  cursor "b" does not exist


The cursor is named "B" not "b", but B without quotes folds to the latter.

 regards, tom lane



Thank you tom for showing me the error in my ways.

Now where's that dunce cap gone ?  Maybe I don't deserve to use
anything better than MySQL.   ;-)


Or read the below and be illuminated:)

https://www.postgresql.org/docs/10/static/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS







--
Adrian Klaver
adrian.kla...@aklaver.com

Re: cursor "x" does not exist

[Bob Jones]

On 14 April 2018 at 16:38, Tom Lane  wrote:
> Bob Jones  writes:
>> My apologies if I'm being incredibly stupid here, but I've reviewed
>> what the docs have to say about naming portals and I still can't see
>> where I'm going wrong here ?
>
> I think you're forgetting to double-quote an upper case identifier.
>
>> FETCH ALL IN B;
>> ERROR:  cursor "b" does not exist
>
> The cursor is named "B" not "b", but B without quotes folds to the latter.
>
> regards, tom lane


Thank you tom for showing me the error in my ways.

Now where's that dunce cap gone ?  Maybe I don't deserve to use
anything better than MySQL.   ;-)

Re: cursor "x" does not exist

[Tom Lane]

Bob Jones  writes:
> My apologies if I'm being incredibly stupid here, but I've reviewed
> what the docs have to say about naming portals and I still can't see
> where I'm going wrong here ?

I think you're forgetting to double-quote an upper case identifier.

> FETCH ALL IN B;
> ERROR:  cursor "b" does not exist

The cursor is named "B" not "b", but B without quotes folds to the latter.

regards, tom lane