IColumnsRowset: Notes

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Implementation Notes

  • The following columns return NULL values:

    DBCOLUMN_COLLATINGSEQUENCE

    DBCOLUMN_COMPUTEMODE

    DBCOLUMN_DEFAULTVALUE

    DBCOLUMN_DOMAIN

    DBCOLUMN_HASDEFAULT

    DBCOLUMN_ISUNIQUE.

  • Driver-specific columns can be requested. There is no way to return the list of what these may be for the driver in use. Consumers should specify a COLUMNID of type DBCOLKIND_GUID_PROPID, with guid equal to GUID_NULL and ulPropid equal to the value of the ODBC driver-specific option (the fDescType parameter in SQLColAttributes). A heuristic is used to determine the data type of the option from the ODBC driver.

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