SPI_getvalue — return the string value of the specified column
char * SPI_getvalue(HeapTuplerow, TupleDescrowdesc, intcolnumber)
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.)
HeapTuple rowinput row to be examined
TupleDesc rowdescinput row description
int colnumbercolumn number (count starts at 1)
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).
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