事件，criteria.createAlias

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DetachedCriteria criteria = DetachedCriteria.forClass(Course.class);
	    
		if(!Strings.isNullOrEmpty(name))criteria.add(Restrictions.like("name",name,MatchMode.ANYWHERE));
		
		//由于course和property之间的关系是，一对多
		//如果增加个查询条件，=propertyId
		//那么这样：
		if(propertyId!=0)criteria.createAlias("properties","properties")
							.add(Restrictions.eq("properties.id",propertyId)).add(Restrictions.eq("properties.id",propertyId2));
		
		//if(propertyId!=0)criteria.createAlias("properties","properties")
		//					.add(Restrictions.eq("properties.id",propertyId));