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.,
ctid
) 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.
TupleDesc rowdesc
input row description
const char * colname
column name
Column number (count starts at 1 for user-defined columns), or
SPI_ERROR_NOATTRIBUTE
if the named column was not
found.