java.sql.SQLException: [Oracle][ODBC][Ora]ORA-06413: Connection not open.

i had this error,,pls any one help me,,its caught from following code ,,i need quick reply,i am using oracle10g windows 7,64bit

pls send solution to tis forums or my mail ia:barathim@ymail.com

code

import java.io.*;
import java.sql.*;
class sample{
public static void main(String args[])
{
try
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(Exception e)
{
System.out.println(e);
}
Connection con=DriverManager.getConnection ("Jdbc:Odbc:hai","system","system");
Statement st=con.createStatement();
st.executeQuery("insert into emp21 values(1,mani,manager,500,01-may-2000,chennai)");


 

ResultSet rs=st.executeQuery("select * from empl21");
while(rs.next())
{
String eno=rs.getString(1);
String ename=rs.getString(2);
String dest=rs.getString(3);
String esal=rs.getString(4);
String jdate=rs.getString(5);
String eaddr=rs.getString(6);
System.out.println(eno+" "+ename+" "+dest+" "+esal+"  "+jdate+" "+eaddr);
}
}
catch(Exception e)
{
System.out.println(e);
}
}
}