SPI_fnumber — determine the column number for the specified column name
int SPI_fnumber(TupleDescrowdesc
, const char *colname
)
SPI_fnumber
returns the column number for the
column with the specified name.
If colname
refers to a system column (e.g.,
oid
) then the appropriate negative column number will
be returned. The caller should be careful to test the return value
for exact equality to SPI_ERROR_NOATTRIBUTE
to
detect an error; testing the result for less than or equal to 0 is
not correct unless system columns should be rejected.