define external counter function SQLGetData
     (  read-only SQL_handle_type StatementHandle,
        value counter ColumnNumber,
        value counter TargetType,
        modifiable stream TargetValue,
        value counter BufferLength,
        modifiable counter StrLen_or_Ind )

Retrieves data for a single column in the result set. It can be called many times to retrieve variable-length data in parts.

Input arguments:

1. StatementHandle.
2. ColumnNumber. The number of the result set column. Columns are numbered in increasing column order starting at zero (column 0 is the bookmark column), if bookmarks are available. Otherwise, column numbers start at 1.
3. TargetType. The C data type of the result data. The following values are allowed:
   • SQL_C_DEFAULT
   • SQL_C_NUMERIC
   • SQL_C_CHAR
   • SQL_C_LONG
   • SQL_C_SHORT
   • SQL_C_FLOAT
   • SQL_C_DOUBLE
   • SQL_C_DATE
   • SQL_C_TIME
   • SQL_C_TIMESTAMP
   • SQL_C_TYPE_DATE
   • SQL_C_TYPE_TIME
   • SQL_C_TYPE_TIMESTAMP
   • SQL_C_INTERVAL_YEAR
   • SQL_C_INTERVAL_MONTH
   • SQL_C_INTERVAL_DAY
   • SQL_C_INTERVAL_HOUR
   • SQL_C_INTERVAL_MINUTE
   • SQL_C_INTERVAL_SECOND
   • SQL_C_INTERVAL_YEAR_TO_MONTH
   • SQL_C_INTERVAL_DAY_TO_HOUR
   • SQL_C_INTERVAL_DAY_TO_MINUTE
   • SQL_C_INTERVAL_DAY_TO_SECOND
   • SQL_C_INTERVAL_HOUR_TO_MINUTE
   • SQL_C_INTERVAL_HOUR_TO_SECOND
   • SQL_C_INTERVAL_MINUTE_TO_SECOND
   • SQL_C_BINARY
   • SQL_C_BIT
   • SQL_C_SBIGINT
   • SQL_C_UBIGINT
   • SQL_C_TINYINT
   • SQL_C_SLONG
   • SQL_C_SSHORT
   • SQL_C_STINYINT
   • SQL_C_ULONG
   • SQL_C_USHORT
   • SQL_C_UTINYINT
   • SQL_C_BOOKMARK
   • SQL_C_VARBOOKMARK
   • SQL_C_TINYINT
   • SQL_C_VARBOOKMARK
   • SQL_ARD_TYPE
   • SQL_C_DEFAULT
4. BufferLength. The maximum length of TargetValue.

Output arguments:

• TargetValue. A pointer to the buffer in which to return the data.
• StrLen_or_Ind. The length of data available for return, or the data indicator value (SQL_NULL_DATA or SQL_NO_TOTAL).