Function SQLSetDescField 

pub unsafe extern "system" fn SQLSetDescField(
    hdesc: HDesc,
    rec_number: SmallInt,
    field_identifier: Desc,
    value: Pointer,
    buffer_length: Integer,
) -> SqlReturn

Sets the value of a single field of a descriptor record.

Returns

SUCCESS, SUCCESS_WITH_INFO, ERROR, or INVALID_HANDLE.