IN Parameter Array

public List<Map> selectBlockList(Map<String, Object> param) {
       
        //Map parmdsd = new HashMap();
        List aa = new ArrayList();
       
       
        Map row = new HashMap();
        row.put("ROW", "1");
        row.put("SHIP", "2006");
        //row.put("velocityCount", "1");
         
        aa.add(row);
       
        Map row2 = new HashMap();
        row2.put("ROW", "2");
        row2.put("SHIP", "2007");
       // row2.put("velocityCount", "2");
        aa.add(row2);
              
        param.put("piv", aa);
        //param.put("velocityCount","2");
       
        return dao.select("PLMB1890Service.selectBlockList", param);
    }