java调用oracle有返回值的函数

create or replace function myfun1(v_ename varchar2) return
number is v_sal number(7,2);
begin
  select sal*12+nvl(comm,0)*12 into v_sal from pme where ename=v_ename;
  return v_sal;
end;

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import java.sql.*;    public class Testproc {        public static void main(String[] args) {         try{             Class.forName("oracle.jdbc.driver.OracleDriver");             Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:myora1", "scott", "tiger");             CallableStatement c = conn.prepareCall("{?=call myfun1(?)}");             c.registerOutParameter(1, Types.VARCHAR);             c.setString(2, "SCOTT");             c.execute();              String s = c.getString(1);             System.out.println(s);             c.close();              conn.close();         }catch(ClassNotFoundException e){             e.printStackTrace();         }catch(SQLException e){             e.printStackTrace();         }     } }