C Function Definition - Analytics Database - Teradata Vantage

SQL External Routine Programming

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-07-11
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iiv1628111441820.ditamap
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dita:id
B035-1147
lifecycle
latest
Product Category
Teradata Vantage™
#define SQL_TEXT Latin_Text
#define SQL_STATE_LENGTH 6
#define ERROR_MESSAGE_LENGTH 257

#include <sqltypes_td.h>
#include "phasetrace.h"

void trace (char *input_string)
{
   void *argv[1];
   int length[1];
   argv[0] = input_string;
   length[0] = strlen(input_string);
   FNC_Trace_Write_DL(1, argv, length);    /* write to trace table. */
}

char tbuf[256];

typedef struct
{
   int cnt;
} local_ctx;
void fnc_phase(
   INTEGER *in1,
   VARCHAR_LATIN *in2,
   INTEGER *out1,   // first result attribute
   VARCHAR_LATIN *out2,
   int* i_i1,
   int* i_i2,
   int* i_o1,
   int* i_o2,
   char      sqlstate[SQL_STATE_LENGTH],
   SQL_TEXT  fncname[FNC_MAXNAMELEN],
   SQL_TEXT  sfncname[FNC_MAXNAMELEN],
   SQL_TEXT  errormsg[ERROR_MESSAGE_LENGTH])

{
   FNC_Phase  Phase;
   local_ctx *state_info;

   /* make sure the function is called in the supported context */
   if (FNC_GetPhase(&Phase) != TBL_MODE_VARY)
   {
      strcpy(sqlstate, "U0005");
      strcpy((char *) errormsg, "Table function being called in unsupported mode.");
      return;
   }
   switch(Phase)
   {
      case TBL_PRE_INIT:
         state_info = FNC_TblAllocCtx(sizeof(local_ctx));
         sprintf (tbuf,"\n In Pre Init");
         trace(tbuf);
         break;
      case TBL_INIT:
         state_info = FNC_TblGetCtx();
         state_info->cnt=1;
         sprintf (tbuf,"\n In Init");
         trace(tbuf);
         break;
      case TBL_BUILD:
         state_info = FNC_TblGetCtx();
         if (state_info->cnt == 0 )
         {
            sprintf (tbuf,"\n In Build setting EOF, input 1 is %d",*in1);
            trace(tbuf);
            strcpy(sqlstate, "02000");
            return;
         }
         sprintf (tbuf,"\n In Build, input 1 is %d",*in1);
         trace(tbuf);
         *out1 = *in1;
         strcpy((char*)out2,(char*)in2);
         state_info->cnt = 0;
         break;
      case TBL_FINI:
         sprintf (tbuf,"\n In Fini");
         trace(tbuf);
         break;
      case TBL_END:
         sprintf (tbuf,"\n In END");
         trace(tbuf);
         break;
   }
}