type casting

<--bean class-->method calllist is of object type

List <Object> o=bss.totalList(i);

<--service class--> public List (object type) <Object> totalList(int pi){

     try{

Query q= em.createQuery("select p,c,b from Book b ,Customer c , Purchage p where c.uid=p.customer.uid and p.book.bid=b.bid and p.pid=:pid") .setParameter("pid", pi);

     return  q.getResultList();
     }catch(Exception e){
         return null;
     }

how to type cast object type to entity type .

View Answers

March 29, 2011 at 1:53 PM

public List dataList(){
ArrayList list=new ArrayList();
try{
     Class.forName("com.mysql.jdbc.Driver");
           Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
           Statement st=con.createStatement();
           ResultSet rs=st.executeQuery("select * from employee");
           while(rs.next()){
               list.add(rs.getString("name"));
               list.add(rs.getString("address"));
               list.add(rs.getString("contactNo"));
               list.add(rs.getString("email"));

}
}
catch(Exception e){}
return list;
}

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