Hello,

As i know after connection closed you will get the value.I tried your question and found that if you make the database connection and fetch the data and store it in the HashMap and after that you close the connection, now if you fetch the value from the Hashmap you will get the value.
try following code
////
public class ValuePersist {
public static void main(String[] args) {
Connection con = null;
HashMap hm =new HashMap();
try{
Class.forName("org.gjt.mm.mysql.Driver");
con = DriverManager.getConnection("jdbc:mysql://temp/myDatabase","root","root";);
Statement st = con.createStatement() ;
ResultSet rs = st.executeQuery("Select ID,DOB from data");
while(rs.next()){
hm.put(rs.getObject(1).toString(), rs.getObject(2).toString());
}
con.close();
System.out.println(hm);
}catch (Exception e) {
e.printStackTrace();
}


}
}

Thanks ...:)