Re: DB2 UDF written in C

> Have you read the "Stored Procedures, Triggers and User Defined Functions on
> DB2 Universal Database for iSeries" redbook. Here is a link to downloadable
> PDF: http://www.redbooks.ibm.com/abstracts/sg246503.html?Open

No, but thanks for the link.

> You don't show it, so let me ask, did you compile this module into a service
> program PGMRPGMLIB/DEBUGOUT?

I believe I did with:

CRTSRVPGM SRVPGM(PGMRPGMLIB/DEBUGOUT) EXPORT(*ALL) ACTGRP(*CALLER)

> Do 'fileName' and 'message' get passed in as struct that has a short 2 byte
> integer value giving you the length of the data, followed by the data
> itself?

Not that I can tell. In the above PDF they have example: (readFileToTable) p513.

They pass in a VARCHAR(255) which maps to *fileName
They are accessing it in the same way: fopen(fileName, "r"))
 
> Elvis
> 
> 
> -----Original Message-----
> From: c400-l-bounces+ebudimlic=centerfieldtechnology.com@xxxxxxxxxxxx
> [mailto:c400-l-bounces+ebudimlic=centerfieldtechnology.com@xxxxxxxxxxxx] On
> Behalf Of Stephen More
> Sent: Friday, March 18, 2005 6:41 AM
> To: c400-l@xxxxxxxxxxxx
> Subject: [C400-L] DB2 UDF written in C
> 
> I am trying to a create a DB2 function that writes output to a file.
> I am close, but it does not seem to work. Does anyone know what the
> problem could be ?
> 
> /*
>     This method will be called from DB2
> 
> */
> #include <stdio.h>
> #include <time.h>
> 
> void DEBUGOUT( char* fileName,
>     char* message,
>     int* ValRet,
>     short* inind,
>     short* outind,
>     char* sqlstate,
>     char* funcname,
>     char* specname,
>     char* msgtext )
> {
>         FILE *fp;
>         char *fileType;
>         time_t  now;
>         struct tm *ptr;
>         char buf1[20];
> 
>         if( ( fp = fopen( fileName, "a" )) != NULL )
>         {
>                 time( &now );
>                 ptr = localtime( &now );
>                 strftime(buf1, 80, "%m/%d/%y %H:%M:%S %p", ptr);
> 
>                 *ValRet = fprintf( fp, "%s %s\n", buf1, message  );
> 
>                 fclose( fp );
>         }
>         else
>         {
>             *ValRet = 0;
>             *outind = 0;
>         }
> }
> 
> CRTCMOD MODULE(PGMRPGMLIB/DEBUGOUT) SRCFILE(PGMRSRCLIB/CSRC)
> DBGVIEW(*SOURCE)
> CRTSRVPGM SRVPGM(PGMRPGMLIB/DEBUGOUT) EXPORT(*ALL) ACTGRP(*CALLER)
> 
> CREATE FUNCTION PGMRPGMLIB/DEBUGOUT( VARCHAR(50), VARCHAR(50) )
> RETURNS INTEGER
> EXTERNAL NAME 'PGMRPGMLIB/DEBUGOUT(DEBUGOUT)'
> LANGUAGE C
> NO SQL
> PARAMETER STYLE SQL
> DETERMINISTIC;
> 
> select ( '/tmp/out.txt', 'Hello' ) from sysibm/sysdummy1
> 
> I am only getting back 0.
> 
> -Thanks
> Steve More
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