java oracle 插入date字段

 DataAccessUtil dau =new DataAccessUtil();
        String sql = "UPDATE BPM_WORKLIST SET STATUS ='COMPLETED' , ENDDATE=to_date(?,'yyyy-MM-dd hh24:mi:ss' ) WHERE TASKID=? " ;
     
       
        SimpleDateFormat f=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        java.util.Date utilDate=new Date();  
        String date = f.format(utilDate);
        java.sql.Date sqlDate=new java.sql.Date(utilDate.getTime());       

        dau.addParamString(1, date);
        dau.addParamString(2, taskId);
        dau.excuteSql(sql);
         sql = "UPDATE BPM_PROCINST SET FINISHEDDATE ='' WHERE INSTID IN ( SELECT INSTID FROM BPM_WORKLIST WHERE TASKID=?)" ;

         dau.addParamString(1, taskId);
      //  pm.completeTask(taskId, paras);
        return dau.excuteSql(sql);