C/C++ Function Name | C/C++ UDMs | Teradata Vantage - 17.10 - C/C++ Function Name - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL External Routine Programming

Advanced SQL Engine
Teradata Database
Release Number
Release Date
July 2021
Content Type
Programming Reference
Publication ID
English (United States)

The name of the method in the C or C++ source code follows the C function naming conventions, with the additional restriction that the name cannot be longer than 30 characters.

In C++, the function definition must be preceded by extern "C" so that the function name is not converted to a C++ overloaded name. For example:

extern "C" 
void get_area( UDT_HANDLE *circleUDT, FLOAT *result, char sqlstate[6])

The function can call any module written in C++.

When you use the CREATE METHOD statement to install the UDM, you specify the name of the C or C++ function. For more information, see Installing the UDM.

On Linux, long names can sometimes cause errors when you install a UDM. For more information, see Argument list too long.