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                # 19.2.1\. 緩存映射(Cache mappings) 類或者集合映射的“`&lt;cache&gt;`元素”可以有下列形式: ``` <cache usage="transactional|read-write|nonstrict-read-write|read-only" region="RegionName" include="all|non-lazy" /> ``` | ![1](1.png) | `usage`(必須)說明了緩存的策略: `transactional`、 `read-write`、 `nonstrict-read-write`或 `read-only`。 | |:--- |:--- | | ![2](2.png) | `region` (可選, 默認為類或者集合的名字(class or collection role name)) 指定第二級緩存的區域名(name of the second level cache region) | | ![3](3.png) | `include` (可選,默認為 `all`) `non-lazy` 當屬性級延遲抓取打開時, 標記為`lazy="true"`的實體的屬性可能無法被緩存 | 另外(首選?), 你可以在hibernate.cfg.xml中指定`&lt;class-cache&gt;`和 `&lt;collection-cache&gt;` 元素。 這里的`usage` 屬性指明了_緩存并發策略(cache concurrency strategy)_。
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