define external counter function SQLColAttribute
     (  read-only SQL_handle_type StatementHandle,
        value counter ColumnNumber,
        value counter FieldIdentifier,
        modifiable stream CharacterAttribute,
        value counter BufferLength,
        modifiable counter StringLength,
        modifiable counter NumericAttribute )

Returns descriptor information for a column in a result set. Descriptor information is returned as a character string, a 32-bit descriptor-dependent value, or an integer value.

Input arguments:

1. StatementHandle.
2. ColumnNumber. The column number of the result data, starting at 1. Columns can be described in any order. Column 0 can be specified, but all values except SQL_DESC_TYPE and SQL_DESC_OCTET_LENGTH will return undefined values.
3. FieldIdentifier. The number of the field to be returned. The following values are allowed:
   • SQL_DESC_COUNT
   • SQL_DESC_TYPE
   • SQL_DESC_LENGTH
   • SQL_DESC_OCTET_LENGTH_PTR
   • SQL_DESC_PRECISION
   • SQL_DESC_SCALE
   • SQL_DESC_DATETIME_INTERVAL_CODE
   • SQL_DESC_NULLABLE
   • SQL_DESC_INDICATOR_PTR
   • SQL_DESC_DATA_PTR
   • SQL_DESC_NAME
   • SQL_DESC_UNNAMED
   • SQL_DESC_OCTET_LENGTH
   • SQL_DESC_ALLOC_TYPE
   • SQL_DESC_ARRAY_SIZE
   • SQL_DESC_ARRAY_STATUS_PTR
   • SQL_DESC_BASE_COLUMN_NAME
   • SQL_DESC_BASE_TABLE_NAME
   • SQL_DESC_BIND_OFFSET_PTR
   • SQL_DESC_BIND_TYPE
   • SQL_DESC_DATETIME_INTERVAL_PRECISION
   • SQL_DESC_LITERAL_PREFIX
   • SQL_DESC_LITERAL_SUFFIX
   • SQL_DESC_LOCAL_TYPE_NAME
   • SQL_DESC_MAXIMUM_SCALE
   • SQL_DESC_MINIMUM_SCALE
   • SQL_DESC_NUM_PREC_RADIX
   • SQL_DESC_PARAMETER_TYPE
   • SQL_DESC_ROWS_PROCESSED_PTR
4. BufferLength. The length of the data buffer, in bytes.

Output arguments:

• CharacterAttribute. The value in the FieldIdentifier field, if it is character data.
• StringLength. The number of bytes returned in CharacterAttribute.
• NumericAttribute. The value in the FieldIdentifier field, if it is numeric data.