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 planprepared 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.