HashMap and dynamic JDBC update

Hello,

I have an HashMap<String, Object> used to save names and values of
fields to be updated via JDBC update in a table. The type of data is
variable according to field name , so I'm using Object ... the idea to
produce update query is as follows but I believe there is a better
method to do it.

//START
public void updateQuery(Session session, String table,
HashMap<String,Object> updateH, String condition) throws Throwable{
        try{
            String sQuery="UPDATE " + table + " SET ";
            String keys="";

            Iterator iterator = updateH.keySet().iterator(); //key set
            while(iterator.hasNext()) //got the key and then remove first char,
ie ","
                keys= keys + "," + iterator.next() + "= ?";

            PreparedStatement ps = session.connection().prepareStatement(sQuery
+ keys.substring(1) + " WHERE " + condition);

            while(iterator.hasNext()){
                Object myObj=updateH.get(iterator.next());
                if(myObj instanceof String){

                    ps.setString(....
                }
                                else if (myObj.instanceof Date){
                                            ps.setDate(.....
                               }
                               //etc also for Double, Integer, ..
            }
            ps.executeUpdate();
        }
        catch(Throwable ex){
            throw ex;
        }
    }

//END

Any suggestions ?

Thanks in advance and best regards,
Paul