关于在DWZ使用ssh后台查询的几种方式

Posted 2020-08-23 厚积薄发

1.查询所有记录，并以列表形式查询

DaoImpl

 1 public PageBean queryByPage(String hql, List<Object> listobj, int pageSize, int page) {
 2         try {
 3             SQLQuery query = this.getHibernateTemplate().getSessionFactory().getCurrentSession().createSQLQuery(hql);
 4             final int offset = PageBean.countOffset(pageSize, page);
 5             final int length = pageSize;            
 6             
 7             for(int i =0;i <listobj.size();i++) {
 8                 if(listobj.get(i) instanceof java.sql.Date) {
 9                     query.setDate(i,(Date)listobj.get(i));
10                 }else {
11                     query.setParameter(i,listobj.get(i));
12                 }
13             }
14             
15             query.setFirstResult(offset);  
16             query.setMaxResults(length); 
17             List list = query.list();
18             
19             List<ZdwhModel> listbd=new ArrayList<ZdwhModel>();
20             ZdwhModel obj=null;
21             Object  arrobj[]=null;
22             for(int i=0;i<list.size();i++){
23                 arrobj=(Object[])list.get(i);
24                 obj=new ZdwhModel();
25                 BigDecimal decimal = (BigDecimal) arrobj[0];
26                 obj.setId(decimal.longValue());
27                 obj.setDic_type((String)arrobj[6]);
28                 obj.setItem_code((String)arrobj[2]);
29                 obj.setItem_name((String)arrobj[3]);
30                 obj.setMemo((String)arrobj[4]);
31                 listbd.add(obj);
32             }
33             //count
34             String countHql="select count(*)   "+hql.substring(hql.indexOf("from"),hql.indexOf("order"));
35             query=null;
36             query = this.getHibernateTemplate().getSessionFactory().getCurrentSession().createSQLQuery(countHql);
37                         
38             for(int i =0;i <listobj.size();i++) {
39                 if(listobj.get(i) instanceof java.sql.Date) {
40                     query.setDate(i,(Date)listobj.get(i));
41                 }else {
42                     query.setParameter(i,listobj.get(i));
43                 }
44             }
45             
46             List listcount = query.list();  
47            
48             int allRow = ((BigDecimal)listcount.get(0)).intValue();
49             final int currentPage = PageBean.countCurrentPage(page);
50             
51              int totalPage = PageBean.countTotalPage(pageSize, allRow);//
52             PageBean pageBean = new PageBean();
53             pageBean.setPageSize(pageSize);
54             pageBean.setAllRow(allRow);
55             pageBean.setTotalPage(totalPage);
56             pageBean.setCurrentPage(currentPage);
57             pageBean.setList(listbd);
58             pageBean.init();    
59             return pageBean; 
60             
61             
62         } catch (Exception e) {
63             e.printStackTrace();
64         }
65         return null;
66     }

ServiceImpl

    public String getHql(Map<String, Object> map,List<Object> listobj){
        String hql = "";
        hql+=" order by id";
        return hql;
    }
    
    public PageBean queryForPage(int pageSize, int page,Map<String, Object> map){
        List<Object> listobj = new ArrayList<Object>();
        String hql = getHql(map, listobj);
        PageBean pageben = zdwhdao.queryByPage(hql, listobj, pageSize, page);
        return pageben;
    }
    

2.预处理查询、并且查询结果 当确定返回的实例只有一个或者null时 用uniqueResult()方法

1 public UserModel islogin(String dwdm,String uname, String upwd) {
2         String hql="from UserModel where uname=? and upwd=? and dwdm=?";
3         Query query=this.getHibernateTemplate().getSessionFactory().getCurrentSession().createQuery(hql);
4         query.setString(0, uname);
5         query.setString(1, upwd);
6         query.setString(2, dwdm);
7         return(UserModel)query.uniqueResult();
8     }