17.10 - CHARACTER LARGE OBJECT / CLOB - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL External Routine Programming

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1147-171K
Language
English (United States)

C Data Type Definition

typedef long LOB_LOCATOR;
typedef long LOB_RESULT_LOCATOR;

Usage

CLOBs are passed as locators only, and not automatically loaded into memory. CLOB argument and return types must specify AS LOCATOR in the CREATE FUNCTION statement.

Here is an example using CLOB AS LOCATOR in a UDF definition and LOB_LOCATOR and LOB_RESULT_LOCATOR in the C function declaration.

SQL Function Definition Equivalent C Function Declaration
CREATE FUNCTION F1 (
  A CLOB AS LOCATOR)
RETURNS CLOB AS LOCATOR
 ...;
void f1( LOB_LOCATOR        *a,
         LOB_RESULT_LOCATOR *result,
   ... )
{  ... }