ingres_field_type() returns the type of a
field in a query result, or
FALSE on failure. Examples of
types returned are "IIAPI_BYTE_TYPE", "IIAPI_CHA_TYPE",
"IIAPI_DTE_TYPE", "IIAPI_FLT_TYPE", "IIAPI_INT_TYPE",
"IIAPI_VCH_TYPE". Some of these types can map to more than one
SQL type depending on the length of the field (see
ingres_field_length()). For example
"IIAPI_FLT_TYPE" can be a float4 or a float8. For detailed
information, see the Ingres/OpenAPI User Guide - Appendix C.
index is the number of the field and must be between 1 and the value given by ingres_num_fields().