How to check for DBNull fields in C ++ - ADO?

Question

I tried to retrieve data from SQL Server via ADO in C ++ and how can I check the null values ​​of the record fields? thre is not a function of IsNUll ()?

Answer 1

Testing for DBNull in a C ++ ADO record set includes checking a fieldpointer->Value property of type VARIANT . To check the values ​​of the null variant, you check the vt field, which is equal to VT_NULL for null values.

So, to check DBNull, check fieldpointer->Value.vt == VT_NULL