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                # 74.5 配置JPA屬性 ### 74.5 配置JPA屬性 Spring Data JPA已經提供了一些獨立的配置選項(比如,針對SQL日志),并且Spring Boot會暴露它們,針對hibernate的外部配置屬性也更多些,最常見的選項如下: ``` spring.jpa.hibernate.ddl-auto=create-drop spring.jpa.hibernate.naming.physical-strategy=com.example.MyPhysicalNamingStrategy spring.jpa.database=H2 spring.jpa.show-sql=true ``` `ddl-auto`配置是個特殊情況,它的默認設置取決于是否使用內嵌數據庫(是則默認值為`create-drop`,否則為`none`)。當本地`EntityManagerFactory`被創建時,所有`spring.jpa.properties.*`屬性都被作為正常的JPA屬性(去掉前綴)傳遞進去了。 Spring Boot提供一致的命名策略,不管你使用什么Hibernate版本。如果使用Hibernate 4,你可以使用`spring.jpa.hibernate.naming.strategy`進行自定義;Hibernate 5定義一個`Physical`和`Implicit`命名策略:Spring Boot默認配置`SpringPhysicalNamingStrategy`,該實現提供跟Hibernate 4相同的表結構。如果你情愿使用Hibernate 5默認的,可以設置以下屬性: ``` spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl ``` 具體詳情可參考[HibernateJpaAutoConfiguration](https://github.com/spring-projects/spring-boot/tree/v1.4.1.RELEASE/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.java)和[JpaBaseConfiguration](https://github.com/spring-projects/spring-boot/tree/v1.4.1.RELEASE/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/JpaBaseConfiguration.java)。
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