Re: Working with pages of data (LIMIT/OFFSET keyword)

I would go with 2).

Npgsql supports multiple resultsets. You can pass a query separated by
semicolon ';' or you can use a procedure call which return a setof
refcursor.

On both ways, you will need to call NextResult in your Datareader just
like with SQLServer.

You can check our user manual: http://manual.npgsql.org to get more
info about how to use refcursors

I hope it helps.

Please, let me know if you need more info.

On Wed, Jun 16, 2010 at 16:44, Szymon Guz <mabewlun(at)gmail(dot)com> wrote:
>
>
> 2010/6/16 Mike Christensen <mike(at)kitchenpc(dot)com>
>>
>> I'm generating a query on the fly to return a set of data, however I
>> only want to display 30 rows at a time to the user.  For this reason,
>> I use the LIMIT 30 OFFSET x clause on the select statement.  However,
>> I also want to know the total rows that match this query had there
>> been no limit, that way I can display to the user the total count and
>> the number of pages, and have Next/Prev buttons in my UI.  I can think
>> of the following ways to do this:
>>
>> 1) When the page loads, execute two totally separate queries.  One
>> that does the COUNT, and then another query immediately after to get
>> the desired page of data.  I don't like this as much because the two
>> queries will execute in separate transactions and it'd be nice if I
>> could just perform a single SQL query and get all this information at
>> once.  However, I will use this if there's no other way.
>>
>
> Just run them in one transaction.
> You can also just show the Next/Prev buttons and then do something just for
> the case where there is no data.
> Or use LIMIT 31 so you always know that there is the next page with at least
> one record.
> regards
> Szymon Guz

--
Regards,

Francisco Figueiredo Jr.
Npgsql Lead Developer
http://www.npgsql.org
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