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).