hibernate_Restrictions用法

最新推荐文章于 2019-09-05 23:59:39 发布

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最新推荐文章于 2019-09-05 23:59:39 发布

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本文介绍Hibernate框架下多种查询方式，包括获取记录数量、分页查询、特定字段查询、模糊查询、not in查询、in条件查询及多表关联查询等实用方法。

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http://blog.youkuaiyun.com/cuiran/article/details/6324083

补充：

百度：criteria:

http://baike.baidu.com/link?url=49PcEgB_kMdEfRGg-aBS_YqEKWEvEwfTZmzHk42CLX1vinmvR7bOGS3tAnFxz6BS2BrBpP1zLsTbSZx0fo35cq

收集：

1 获得count：

public Long findCount(String vendorId) {
       DetachedCriteria criteria = DetachedCriteria.forClass(Inventory.class)
                .setProjection(Projections.rowCount())
               .add(Restrictions.eq(VENDORID, vendorId));
        return Long.parseLong(getHibernateTemplate().findByCriteria(criteria).get(0).toString());
   }

(2)

public int countAccessCodes(String vid) {
       StringBuffer query = new StringBuffer("SELECT COUNT(*) FROM ").append(Accesscodes.class.getName()).append(" where vid='").append(vid).append("'");
       List rs = (List) getHibernateTemplate().find(query.toString());
       if(rs.isEmpty())
           return 0;
       else
           return Integer.parseInt(rs.get(0).toString());
   }

2 分页：

List<Inventory> inventories = (List<Inventory>) getHibernateTemplate()
               .execute(new HibernateCallback() {
                   public Object doInHibernate(Session session)
                           throws HibernateException, SQLException {
                       return session.createQuery(hql.toString()).setFirstResult(firstRow)
                               .setMaxResults(pageSize).list();
       }});

3 查询某个字段：

public List<String> findPropvalues(String vendorId, int propnumber) {
        return (List<String>)getHibernateTemplate().findByCriteria(
                DetachedCriteria.forClass(Properties.class)
                .add(Restrictions.eq(VID, vendorId))
                .add(Restrictions.eq(PROPNUMBER, propnumber))
                .addOrder(Order.asc(PROPVALUE))
                .setProjection(Projections.distinct(Projections.property(PROPVALUE)))
                );
    }

4 模糊查询like

public List<Orderitemattribs> findByImage(Long orderdataid, Long orderitemid){
       return (List<Orderitemattribs>)getHibernateTemplate().findByCriteria(
               DetachedCriteria.forClass(Orderitemattribs.class)
                   .add(Restrictions.eq("orderid", orderdataid))
                   .add(Restrictions.eq("orderitemid", orderitemid))
                   .add(Restrictions.like("attname", "%Image%"))
                );
   }

5 not in :

public List<A> find(String vendorId, boolean isPerServerMode, boolean showGiftCardCert) {
DetachedCriteria query = DetachedCriteria.forClass(A.class)
.add(

(!isPerServerMode)?Restrictions.eq(VID, vendorId):Restrictions.or(Restrictions.eq(VID, vendorId), Restrictions.isNull(VID))
);
if(!showGiftCardCert) {
DetachedCriteria detachedCriteria = DetachedCriteria.forClass(B.class)
.add(Restrictions.eq(VID, vendorId))
.add(Restrictions.isNotNull(GIFT_CERT_ID))
.setProjection(Projections.property(GIFT_CERT_ID));
query.add(Subqueries.propertyNotIn(GIFT_CERT_ID, detachedCriteria));
}
return (List<A>) getHibernateTemplate().findByCriteria(query);
}

6 查询条件in (id,id,id,id)

public List<Properties> findProperties(String vendorId, String propName,
List<Long> itemIds) {
if (itemIds.isEmpty())
return new ArrayList<Properties>();
DetachedCriteria criteria = DetachedCriteria.forClass(Properties.class)
.add(Restrictions.eq(VID, vendorId))
.add(Restrictions.eq(PROP_NAME, propName));
Disjunction disjunction = Restrictions.disjunction();
for (Long itemId : itemIds)
if (itemId != null)
disjunction.add(Restrictions.eq(IID, itemId)); // 这里写根据条件list添加
criteria.add(disjunction);
return getHibernateTemplate().findByCriteria(criteria);
}

7 多表查询：

（1）多对一：如图1，实体类

如图2：语法：

8 使用hsql

public List<SuggestionAdminGroup> findAdminGroup(final String vid,final Long adminid){
       return (List<SuggestionAdminGroup>)getHibernateTemplate().executeFind(new HibernateCallback(){
           public Object doInHibernate(Session session)
                   throws HibernateException, SQLException {
               String sql = "SELECT s FROM "+SuggestionAdminGroup.class.getName()+" s,"+SuggestionGroup.class.getName()+" g where " +
                       "s.adminId="+adminid+" and g.vid='"+vid+"' and g.suggestionGroupId=s.suggestionGroupId"; // hsql
               Query query = session.createQuery(sql);
               return query.list();
           }
       });
   }