What java collection for large amount of data and user customizable record

Question

I'm trying to write an application which operates on large amount of data. I want user could customize data structure (record) from different types of variables(float,int,bool,string,enums). These records should be stored in some kind of Array. Size of record: 1-200 variables; size of Array of those records: about 100000 items (one record every second through whole day). I want these data stored in some embedded database (sqlite, hsqldb) - access using simple JDBC. Could you give me some advise how to design thoses data strucures. Sincerely yours :)
Ok, maybe I give some example. This will be some C++ code.
I made an interface:
class ParamI {
virtual string toString() = 0;
virtual void addValue( ParamI * ) = 0;
virtual void setValue( ParamI * ) = 0;
virtual BYTE getType() = 0;
Than I made some template class derived from interface ParamI:
template <class T>
class CParam : CParamI {
public:
     void setValue( T val );
     T getValue();
     string toString();
     void setValue( ParamI *src ) {
          if ( itemType == src->getType() ) {
               CParam<T> ptr = (CParam<T>)src;
               value = ptr->value;
private:
     BYTE itemType;
     T value;
sample constructor of <int> template:
template<> CParam<int>::CParam() {
     itemType = ParamType::INTEGER;
This solution makes me possible to write collection of CParamI:
std::vector<CParamI*> myCollection;
CParam<int> *pi = new CParam<int>();
pi->setValue(10);
myCollection.push_back((CParamI*)pi);
Is this correct solution?. My main problem is to get data from the collection. I have to check its data type using getType() method of CParamI interface.
Please could give me some advise, some idea to make it right using java.

Answer 1

If you have the requirement that you have to be able to configure on the fly, then what I've done in the past is just put everything into data pairs into a list: something along the line of: (<Vector>, <String>), where the Vector would store your data and String would contain a data type. I would then make a checker to validate the input according to the SQL databypes that I want to support on the project. It's not a big deal with the amount of data you are talking about.
The problem you're going to have is when you try to allow dynamic definition, on the fly, of data being input to a table that has already been defined. Your DB will not support that, unless you just store that data pair--which I do not suggest.