Indicates the data types after string conversion.
Enumeration values
VT_INTEGER: integer
VT_DOUBLE: double-precision floating-point
VT_STRING: string
VT_NULL: null
VT_BLOB: BLOB
enum VariantType {
VT_INTEGER = 0;
VT_DOUBLE = 1;
VT_STRING = 3;
VT_NULL = 6;
VT_BLOB = 7;
}