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                # 19.2.3\. 策略:讀/寫緩存(Strategy: read/write) 如果應用程序需要更新數據,那么使用`讀/寫緩存` 比較合適。 如果應用程序要求“序列化事務”的隔離級別(serializable transaction isolation level),那么就決不能使用這種緩存策略。 如果在JTA環境中使用緩存,你必須指定`hibernate.transaction.manager_lookup_class`屬性的值, 通過它,Hibernate才能知道該應用程序中JTA的`TransactionManager`的具體策略。 在其它環境中,你必須保證在`Session.close()`、或`Session.disconnect()`調用前, 整個事務已經結束。 如果你想在集群環境中使用此策略,你必須保證底層的緩存實現支持鎖定(locking)。Hibernate內置的緩存策略并不支持鎖定功能。 ``` <class name="eg.Cat" .... > <cache usage="read-write"/> .... <set name="kittens" ... > <cache usage="read-write"/> .... </set> </class> ```
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