JBUILDER如何执行ORACLE的储存过程

Question

      import oracle.jdbc.driver.*;
      ……
      CallableStatement cstmt=conn.prepareCall("{call checkservice ?,?,?}");
      cstmt.setString(1,"myuserid");
      cstmt.setString(2,"fcun");
      cstmt.registerOutParameter(3,java.sql.Types.REAL);
      float res=cstmt.execute();
      ResultSet rs = ((OracleCallableStatement)cstmt).getCursor(3);
      while(rs.next())
      String outParam=rs.getString(3);