Parameter Lists in Functions that User Period Types - 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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B035-1147
lifecycle
latest
Product Category
Teradata Vantage™

UDFs can define Period arguments and return values, passing them by a handle.

Here is an example of how to declare a scalar function that uses Period types:

/*****  C source file name: udfsamp.c  *****/
   
#define SQL_TEXT Latin_Text
#include <sqltypes_td.h>
   
void do_something( PDT_HANDLE          *aPDT,
                  PDT_HANDLE          *resultPDT,
                  char                sqlstate[6] )
{
     ...
}

The corresponding CREATE FUNCTION statement looks like this:

CREATE FUNCTION DO_SOMETHING(A PERIOD(TIMESTAMP))
        RETURNS PERIOD(DATE)
        LANGUAGE C
        NO SQL
        PARAMETER STYLE TD_GENERAL
        EXTERNAL NAME 'CS!udfsamp!td_udf/udfsamp.c';

For details on the PDT_HANDLE C data type, see C Data Types.