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JPA Doc
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JPA Miscellaneous

This section contains miscellaneous JPA types. The PersistenceUtil and PersistenceUnitUtil interfaces provide general utility methods: The Cache interface and the CacheRetrieveMode and CacheStoreMode enum types serve in managing the EntityManagerFactory's shared (level 2) cache: Other enum types are provided for setting of various JPA operations:
Manual
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JPA Persistence Unit

A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. persistence.xml Persistence units are defined in
Manual
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Online Backup

backup root directory can be specified by setting the target parameter before executing the backup
Manual
7

Running JPA Queries

("UPDATE Country SET area = 0").executeUpdate(); A TransactionRequiredException is thrown
Tutorial
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Step 1: Create a Java Project

qualified class name is set (you may use copy & paste). Click the Finish button to create
Tutorial
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Step 2: Entity Class and Persistence Unit

+ ")"; } } A default JPA persistence unit (with default settings) was generated in a persistence.xml
Tutorial
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Step 2: Entity Class and Persistence Unit

entity class will represents guests in the database. We also need to configure JPA by setting a META-INF
Tutorial
7

Step 2: Entity Class and Persistence Unit

+ ")"; } } A default JPA persistence unit (with default settings) was generated in a persistence.xml file
Tutorial
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Step 2: Entity Class and Persistence Unit

guests in the database. We also need to configure JPA by setting a META-INF/persistence.xml file
Tutorial
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Step 3: Create an ObjectDB Data Source

. The next step is using this data source to create a data set for the BIRT report.