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                ### 29.3.3. 創建和刪除JPA數據庫 默認情況下,只有在你使用內嵌數據庫(H2, HSQL或Derby)時,JPA數據庫才會被自動創建。你可以使用`spring.jpa.*`屬性顯式的設置JPA,比如,將以下配置添加到`application.properties`中可以創建和刪除表: ```properties spring.jpa.hibernate.ddl-auto=create-drop ``` **注** Hibernate自己內部對創建,刪除表支持的屬性是`hibernate.hbm2ddl.auto`(如果你記得更好)。你可以使用`spring.jpa.properties.*`(前綴在被添加到實體管理器之前會被去掉)設置Hibernate其他的native屬性,比如:`spring.jpa.properties.hibernate.globally_quoted_identifiers=true`將傳遞`hibernate.globally_quoted_identifiers`到Hibernate實體管理器。 通常,DDL執行(或驗證)被延遲到`ApplicationContext`啟動后,這可以通過`spring.jpa.generate-ddl`標簽控制,如果Hibernate自動配置被激活,那該標識就不會被使用,因為`ddl-auto`設置粒度更細。
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