在SSH框架多表查询时聚合函数的使用

对于SSH框架下多表查询聚合函数的问题，还真纠结了我蛮久！做出来之后，发现虽然这个问题没有特别复杂，但是要注意的东西还是有蛮多的！比如：在SSH框架下平时简单的多表查询中，我们可以通过对象来获取他的值，但是在聚合函数查询的时候，我们不能select一个对象，必须是一个具体的值！下面是我做的一个项目中有用到关于这个问题的地方，跟大家一起来分享一下！

在dao包里面：

//分页显示所有统计查询船舶违章的具体信息
    public List getAllBreakInformationT(final String hql, final Integer page , final Integer size, final Object ...p){
        return getHibernateTemplate().executeFind(new HibernateCallback(){

            public Object doInHibernate(Session session)
                    throws HibernateException, SQLException {
                Query query = session.createQuery(hql);
                query.setCacheable(true);
                if (p != null) {
                    for (int i = 0; i < p.length; i++) {
                        query.setParameter(i, p[i]);
                    }
                }
                if ( page != null && size != null) {
                    query.setFirstResult((page-1)*size).setMaxResults(size);
                }
                List list = query.list();
                return list;
            }});
    }

    //按时间、船舶船员名，违章代码统计查询的总条数
    public Integer countCheckBreak(final String bname, final String sname, final java.sql.Date sDate, final java.sql.Date lDate, final int incode) {
        return (Integer) getHibernateTemplate().execute(new HibernateCallback(){

            public Object doInHibernate(Session session)
                    throws HibernateException, SQLException {
                String hql = "select count(*) from ViolationTable where 1=1";
                StringBuffer sb=new StringBuffer(hql);
                if(sDate!=null){
                    sb.append(" and vitime >='"+sDate+"'");
                    System.out.print("dao sdate:"+sDate);
                }
                if(lDate!=null){
                    sb.append(" and vitime <='"+lDate+"'");
                    System.out.print("dao ldate:"+lDate);
                }
                if(bname!="" && bname!=null){
                    sb.append(" and driveTable.boatTable.bchinesename like '%"+bname+"%' group by driveTable.boatTable.bchinesename");
                    System.out.print("dao bname:"+bname);
                }
                if(sname!="" && sname!=null){
                    sb.append(" and driveTable.sailorTable.sname like '%"+sname+"%' group by driveTable.sailorTable.sname");
                    System.out.print("dao sname:"+sname);
                }
                if(incode!=0){
                    sb.append(" and informationTable.incode ="+incode + "group by informationTable.incode");
                    System.out.print("dao incode:"+incode);
                }
                String sql=sb.toString();
                Query query = session.createQuery(sql);
                //query.setCacheable(true);
                //Object object = query.uniqueResult();
                List list=query.list();
                System.out.print("list.size()"+list.size());
                return list.size();
            }});
    }

    //根据船舶船员名、时间和违章代码统计查询
    public String gethqlB(final String bname, final String sname, java.sql.Date sDate, java.sql.Date lDate, int incode) {
        String hql="select count(viid),sum(informationTable.ingrade),sum(informationTable.inmoney),informationTable.incode,driveTable.boatTable.bchinesename,driveTable.sailorTable.sname from ViolationTable where 1=1";
        StringBuffer sb=new StringBuffer(hql);
        if(sDate!=null){
            sb.append(" and vitime >='"+sDate+"'");
        }
        if(lDate!=null){
            sb.append(" and vitime <='"+lDate+"'");
        }
        if(bname!="" && bname!=null){
            sb.append(" and driveTable.boatTable.bchinesename like '%"+bname+"%' group by driveTable.boatTable.bchinesename");
        }
        if(sname!="" && sname!=null){
            sb.append(" and driveTable.sailorTable.sname like '%"+sname+"%' group by driveTable.sailorTable.sname");
        }
        if(incode!=0){
            sb.append(" and informationTable.incode ="+incode + "group by informationTable.incode");
        }
        sb.append(" order by vitime desc");
        System.out.println(sb.toString());
        String sql=sb.toString();
        return sql;
    }

在service包里面

    //根据违章代码，船舶船员名和时间统计查询
    public Map getAllChekB(String bname,String sname,Date sDate,Date lDate,int incode,int page,int size){
        String hql=violationTableDAO.gethqlB(bname, sname, sDate, lDate,incode);
        System.out.println("hql="+hql);
        //求总条数
        int num = violationTableDAO.countCheckBreak(bname, sname, sDate, lDate, incode);
        System.out.println("num="+num);
        
        //求总页数
        int count = num%size==0 ? num/size : num/size+1 ;
        
        //越界查询
        if(page<1)   page = 1;
        if(page>count)  page = count ;
        System.out.println(1234564);
        
        List vlist = violationTableDAO.getAllBreakInformationT(hql, page, size);
        System.out.println(vlist.size()+"******");

        List list=new ArrayList();
        for (int i = 0; i < vlist.size(); i++) { 
            Object ob[]=(Object[]) vlist.get(i);
            CountTest ct=new CountTest();
            ct.setVcount(Integer.parseInt(ob[0].toString()));
            ct.setVsum(Integer.parseInt(ob[1].toString()));
            ct.setVmoney(Double.parseDouble(ob[2].toString()));
            ct.setIncode(Integer.parseInt(ob[3].toString()));
            ct.setBchinesename(ob[4].toString());
            ct.setSname(ob[5].toString());
            System.out.println("ct-Vcount:"+ct.getVcount());
            list.add(ct);
        }
        
        Map map = new HashMap();
        
        map.put("list", list);
        map.put("page", page);
        map.put("size", size);
        map.put("num", num);
        map.put("count", count);
        
        return map;
    }

在action包里面

    //根据船舶,船员名和日期查找违章记录
    public String checkRecord(){
        HttpServletRequest request=ServletActionContext.getRequest();
        HttpServletResponse response=ServletActionContext.getResponse();
        
        int page =1 ;
        int size = 5 ;
        String pageString = request.getParameter("page");
        if (pageString != null) 
            page = Integer.parseInt(pageString);
        
        String sizeString = request.getParameter("size");
        if(sizeString != null)
            size = Integer.parseInt(sizeString);
        
        String bname=request.getParameter("bname");
        if(bname!=null){
            bname=bname.trim().toString();
        }
        request.setAttribute("bname", bname);
        System.out.println("bname:"+bname);
        String sname=request.getParameter("sname");
        if(sname!=null){
            sname=sname.trim().toString();
        }
        request.setAttribute("sname", sname);
        System.out.println("sname:"+sname);
        String icode=request.getParameter("incode");
        int incode=0;
        if(icode!=null){
            icode=icode.trim().toString();
        }
        System.out.println(icode);
        if(icode!="" && icode!=null){
            incode=Integer.parseInt(icode);
        }
        System.out.println("incode:"+incode);
        request.setAttribute("incode", incode);
        
        String syear=request.getParameter("syear");
        String smonth=request.getParameter("smonth");
        String sday=request.getParameter("sday");
        String lyear=request.getParameter("lyear");
        String lmonth=request.getParameter("lmonth");
        String lday=request.getParameter("lday");
        
        Date sDate=null;
        if(!"".equals(syear) && syear!=null){
            System.out.println(123456);
            StringBuffer sb1=new StringBuffer();
            sb1.append(syear);
            sb1.append("-");
            sb1.append(smonth);
            sb1.append("-");
            sb1.append(sday);
            sDate=Date.valueOf(sb1.toString());
        }
        request.setAttribute("sDate", sDate);
        System.out.println("sDate:"+sDate);
        
        Date lDate=null;
        if(!"".equals(lyear) && lyear!=null){
            System.out.println(22222223);
            StringBuffer sb2=new StringBuffer();
            sb2.append(lyear);
            sb2.append("-");
            sb2.append(lmonth);
            sb2.append("-");
            sb2.append(lday);
            lDate=Date.valueOf(sb2.toString());
        }
        request.setAttribute("lDate", lDate);
        System.out.println("lDate:"+lDate);
        
        if(("".equals(bname) || bname==null) && ("".equals(sname) || sname==null) && incode==0){
            Map map=breakRecordService.getAllChek(bname, sname, sDate, lDate, incode, page, size);
            request.setAttribute("checkmap", map);
            return "CheckDate";
        }else if((!"".equals(bname) || bname!=null) && ("".equals(sname) || sname==null) && incode==0){
            System.out.println("bname进来");
            Map map=breakRecordService.getAllChekB(bname, sname, sDate, lDate, incode, page, size);
            request.setAttribute("checkmap", map);
            return "CheckBname";
        }else if(("".equals(bname) || bname==null) && (!"".equals(sname) || sname!=null) && incode==0){
            System.out.println("sname进来！");
            Map map=breakRecordService.getAllChekB(bname, sname, sDate, lDate, incode, page, size);
            request.setAttribute("checkmap", map);
            return "CheckSname";
        }else if(("".equals(bname) || bname==null) && ("".equals(sname) || sname==null) && incode!=0){
            System.out.println("incode进来！");
            Map map=breakRecordService.getAllChekB(bname, sname, sDate, lDate, incode, page, size);
            request.setAttribute("checkmap", map);
            return "CheckIncode";
        }
        return "err";
    }