SPI_getargtypeid — return the data type OID for an argument of
a statement prepared by SPI_prepare
Oid SPI_getargtypeid(SPIPlanPtrplan, intargIndex)
SPI_getargtypeid returns the OID representing the type
for the argIndex'th argument of a statement prepared by
SPI_prepare. First argument is at index zero.
SPIPlanPtr plan
prepared statement (returned by SPI_prepare)
int argIndexzero based index of the argument
The type OID of the argument at the given index.
If the plan is NULL or invalid,
or argIndex is less than 0 or
not less than the number of arguments declared for the
plan,
SPI_result is set to SPI_ERROR_ARGUMENT
and InvalidOid is returned.