Return the data type oid for an argument of a statement prepared by spi_prepare
Oid SPI_getargtypeid(SPIPlanPtr plan, int argIndex)
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 argIndex
zero 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.