RetrieveValue()

template<NullableValueType T>

T sqt::NullableValueTraits< T >::RetrieveValue ( const Statement & statement, int column_index )

static

Retrieves a nullable value from the statement at the specified column index.

Parameters

statement	The statement from which the value is retrieved.
column_index	The index of the column from which to retrieve the value.

Returns

The retrieved value.

If the value at the specified column index is null, this method returns std::nullopt. Otherwise, it delegates to the RetrieveValue() method of the corresponding sqt::PrimitiveValueTraits<> specialization to retrieve the underlying value.

See also

sqt::PrimitiveValueTraits<INTEGER>::RetrieveValue()

sqt::PrimitiveValueTraits<FLOAT>::RetrieveValue()

sqt::PrimitiveValueTraits<std::string>::RetrieveValue()