group by 与连接查询 问题 - ITeye问答
group by 与连接查询 问题10 String hql_count = "select s.name,count(c....Hibernate: select shelf2_.name as col_0_0_, count(commodity0_.id) as...
什么叫n+1次select查询问题?_百度知道
什么叫n+1次select查询问题?默认情况下,当Hibernate从数据库中加载Customer对象时,会同时加载所有关联的Order对象。以Customer和Order类为例,假定ORDERS表的CUSTOMER_...