On Thu, Mar 10, 2005 at 01:51:07PM -0800, Mark Richardson wrote:
> I'm doing a port from Sybase's pre-compiler cpre, to ecpg and I have a couple of questions (if anyone has the time).
Thisrelates to cursors and fetching, and what I would like to do is retrieve a bunch of records at one time - cpre is
ableto fetch values into an array...
> EXEC SQL BEGIN DECLARE SECTION;
> int myInts[100];
> EXEC SQL END DECLARE SECTION;
> ...
> EXEC SQL DECLARE myCursor FOR SELECT
> myInt FROM myTable;
>
> EXEC SQL FETCH myCursor INTO
> :myInts;
>
> There is one mechanism that cpre uses to make sure that you don't exceed the array size...
> EXEC SQL OPEN myCursor ROW_COUNT=100;
> then, every time you do a fetch, it retrives 100 rows.
This is usually done in the fetch statement and not in the open one.
Just use
EXEC SQL FETCH 100 myCursor INTO :myInts;
> Also, since I'm in the middle of a port, I'm trying to make the code work for both with a different compile flag -
butthe pre-compilers don't care about #defines. Is there some other mecanism to tell ecpg to ignore or skip a section?
I really don't want to have to make a "Pre-pre-compiler".
EXEC SQL DEFINE/IFDEF/...
> I thought I would share this - the ecpg pre-compiler is much easier to work with, and it handles things better than
cprewhen it comes to code generation. I think it would be much easier to port from ecpg to cpre than what I am doing,
becausea lot of the non-standard options that are available used/forced in cpre. So thanks for all the work you guys
havedone.
Nice to hear that. :-)
Michael
--
Michael Meskes
Email: Michael at Fam-Meskes dot De
ICQ: 179140304, AIM/Yahoo: michaelmeskes, Jabber: meskes@jabber.org
Go SF 49ers! Go Rhein Fire! Use Debian GNU/Linux! Use PostgreSQL!
