2010.03.30————hql语句处理时间问题

2010.03.30————hql语句处理时间问题

public List<CP_GongCheng> getByDate(Date start,Date end){
		String hql = "from CP_GongCheng o where o.kg_date between "+start+" and "+end;
		return (List<CP_GongCheng>)this.getHibernateTemplate().find(hql);
	}

当我这样写时，就会报异常：

org.hibernate.hql.ast.QuerySyntaxException: unexpected token: Jan near line 1, column 54

而当我像下面写时，就没有问题，貌似必须把参数和hql分开，原因我也不知道

public List<CP_GongCheng> getByDate(Date start,Date end){
		String hql = "from CP_GongCheng o where o.kg_date between ? and ?";
		Object[] values = {start,end};
		return (List<CP_GongCheng>)this.getHibernateTemplate().find(hql,values);
	}