Re: [SQL] Stepping through a table.

Thanks, I was thinking that's what cursors did, but I can't find a good
source anywhere that actually tells you that you are reading one record at
a time instead of submitting a whole query where the results are place in
memory.

You mentioned that cursors are read only. Can I do update statements while
navigating with cursors? Or do they lock the records they are reading?

Again, thank you.

Matthew

At 12:19 PM 8/16/99 +0300, Herouth Maoz wrote:
>At 05:58 +0300 on 16/08/1999, Matthew Hagerty wrote:
>
>
>> If I need to process each record in a table, how can I step through each
>> record? I suppose I could write a query to return all records and fetch
>> each row that way, but that would be a big memory pig, no? Also, the table
>> could get pretty big. Is there some way to navigate a table, maybe
>> fetching one record from the disk at a time, or something similar?
>
>I guess you are looking for cursors. Read about it on page 154 of the
>PostgreSQL user guide, or check out the manpage about "declare". Note that
>PostgreSQL cursors are readonly, and can't be used to update information.
>
>Herouth
>
>--
>Herouth Maoz, Internet developer.
>Open University of Israel - Telem project
>http://telem.openu.ac.il/~herutma
>
>