org.hibernate.LazyInitializationException
在一對多和多對一的時候，默認的lazy爲true，多表的時候，懶加載是默認的，所以在頁面和servlet交互的時候，要將lazy改爲false 勤加載和懶加載 勤加載：調用的時候就會先檢索一級緩存，如果一級緩存存在對應的主鍵對象，就不會發起數據庫的查詢，將緩存中的數據值返回，如果一級緩存沒有，就會檢索是否存在二級緩存，如果二級緩存存在就返回，否在就發起SQL語句，到達數據庫。 懶加載：又叫延遲加載
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