centos man page for spi_getvalue

SPI_GETVALUE(3) 					  PostgreSQL 9.2.7 Documentation					   SPI_GETVALUE(3)

NAME
       SPI_getvalue - return the string value of the specified column

SYNOPSIS
       char * SPI_getvalue(HeapTuple row, TupleDesc rowdesc, int colnumber)

DESCRIPTION
       SPI_getvalue returns the string representation of the value of the specified column.

       The result is returned in memory allocated using palloc. (You can use pfree to release the memory when you don't need it anymore.)

ARGUMENTS
       HeapTuple row
	   input row to be examined

       TupleDesc rowdesc
	   input row description

       int colnumber
	   column number (count starts at 1)

RETURN VALUE
       Column value, or NULL if the column is null, colnumber is out of range (SPI_result is set to SPI_ERROR_NOATTRIBUTE), or no output function
       is available (SPI_result is set to SPI_ERROR_NOOUTFUNC).

PostgreSQL 9.2.7						    2014-02-17							   SPI_GETVALUE(3)