Example: FNC_GetXMLInfo, FNC_GetXML, and FNC_SetXML - Analytics Database - Teradata Vantage

This function takes an XML parameter, retrieves the XML value, and returns the string in the XML return parameter.

CREATE FUNCTION xmlUDF1(P1 XML)
RETURNS XML
NO SQL
PARAMETER STYLE SQL
DETERMINISTIC
LANGUAGE C
EXTERNAL NAME 'CS!xmlUDF1!xmlUDF1.c';

void xmlUDF1(XML_HANDLE* xml_handle,
             XML_HANDLE* return_handle,
             int*        indicator_thisXML,
             int*        indicator_returnXML,
             char        sqlstate[6],
             SQL_TEXT    extname[129],
             SQL_TEXT    specific_name[129],
             SQL_TEXT    error_message[257] )
{
    FNC_XMLSize_t xmlSize;
    char* xmlBuffer;

    int xmlBufferSize;
    int numLobs;

    /* Get the XML Size. Note we use size + 2 to account for
       the Unicode null termination character. */
     FNC_GetXMLInfo(*xml_handle, &xmlSize, &numLobs); 
  
     if(numLobs == 0) 
    {
      xmlBuffer = (char*)FNC_Malloc(xmlSize + 2);
      xmlBufferSize = xmlSize + 1;

     /* Get the XML Value */
      FNC_GetXML(*xml_handle, xmlBuffer, xmlBufferSize, &xmlSize); 
                                                                                                   
     /* Set the XML string as return value */
      FNC_SetXML(*return_handle, xmlBuffer, xmlSize); 

     *indicator_returnXML = 0;
     FNC_free(xmlBuffer);
    }
}