Creating General Global Functions | SQL External Routine Programming | Vantage - Creating General Global Functions - 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 Vantageā„¢

One way to create a general global function is to supply the code in a C/C++ function for the first UDF you create.

For example, suppose you have the following general global function:

/*****  Source code filename: global1.c  *****/
int global1( char *text1)
{
   ...
}

The C code for the first UDF declares the general global function as external, and looks like this:

/*****  Source code filename: udf1.c  *****/
#define SQL_TEXT Latin_Text
#include <sqltypes_td.h>
 
external global1(char *text1);
   
void udf1(CHARACTER *a, INTEGER *result,
          ... )
{
   int global_result;
 
   global_result = global1(a);
   ... 
   
}

The corresponding CREATE FUNCTION statement must specify the source for the general global function and the first UDF:

CREATE FUNCTION UDF1(A CHAR(30) CHARACTER SET LATIN)
RETURNS INTEGER
  ...
EXTERNAL NAME 'CS!global1!global1.c!CS!udf1!udf1.c';