Re: [INTERFACES] Use ecpg

On Thu, 28 Jan 1999, Margarita Barvinok wrote:

>
> Hello All,
>
> I just began to use postgresql-6.4.2 and ecpg (version: 2.4.4).
> I try t precompile simple
> code ( I took it from a book) and get this error message:
> prog:17: parse error
> Perhaps this is stupid error, but I have no idea what to do, because I
> don't have good manual on Embedded SQL. Can I find somewhere
> documentation on C-Embedded SQL?

I'm kinda in the same boat.  I've been using the Oracle Pro*C precompiler
manual.  I don't have the URL here at work but I found an online copy
using www.google.com

>   /* set error handler to bail out if we can't connect */
>   EXEC SQL WHENEVER SQLERROR
>     {                                            /* LINE 17     */
>     printError();
>     return FAILURE;
>     };
>

I don't think this will work.  I think you need to define an action for
the ecpg parser.  I asked one of the authors about the sqlerror option and
here's a snippet from the e-mail I got this morning

<snip>


> interested in the actions to whenever sqlerror.  I tried to look in the
> preproc.y file but I have no idea what I'm looking at.  I saw a DO and
> a CALL but can't find out what they mean.

The following actions are defined:

continue
sqlprint
stop
goto label
go to label
do break
do function(parameter)
call function(parameter)

</snip>

For me, the best documentation has been the test progs bundled in the
postgresql distro.  From memory the location is

postgresql-6.4.2/src/interfaces/ecpg/test

or something like that. There are two test programs and a preformace
program.

Hope this helps.  I you'd be so kind, mail me and let me know how things
work out, I'm working on error handling tonight.

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