About persistence unit

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Manual
251

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
Tutorial
235

Step 2: Entity Class and Persistence Unit

with a default persistence unit (that will be configured later). If the Finish button is disabled ... + ")"; } } A default JPA persistence unit (with default settings) was generated in a persistence.xml ... /xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction-type
Tutorial
235

Step 2: Entity Class and Persistence Unit

with a default persistence unit (that will be configured later). If the Finish button is disabled ... + ")"; } } A default JPA persistence unit (with default settings) was generated in a persistence.xml file ... .com/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction
Tutorial
229

Step 2: Entity Class and Persistence Unit

/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit ... ="javax.persistence.jdbc.password" value="admin"/> persistence-unit ... .persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity
Tutorial
229

Step 2: Entity Class and Persistence Unit

/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction-type="JTA"> com ... > persistence-unit> persistence> Now ObjectDB should be used as a JPA provider with the specified ... .Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax
JDO Doc
66

Constants.PMF_ATTRIBUTE_PERSISTENCE_UNIT_NAME

Static Field javax.jdo.Constants String PMF_ATTRIBUTE_PERSISTENCE_UNIT_NAME The name of the persistence manager factory element's "persistence-unit-name" attribute. Since: JDO 2.1
JDO Doc
65

Constants.PROPERTY_PERSISTENCE_UNIT_NAME

Static Field javax.jdo.Constants String PROPERTY_PERSISTENCE_UNIT_NAME "javax.jdo.option.PersistenceUnitName" Since: JDO 2.1 See Also: PersistenceManagerFactory.getPersistenceUnitName()
Manual
35

Storing JPA Entity Objects

"> <persistence-unit-metadata> <persistence-unit-defaults> persist/> persistence-unit-defaults> persistence-unit-metadata> The mapping file ... explicitly in the persistence unit definition (in persistence.xml). Batch Store Storing a large number
JPA Doc
33

javax.persistence.Persistence

(String persistenceUnitName) Create and return an EntityManagerFactory for the named persistence unit. Create and return an EntityManagerFactory for the named persistence unit. Parameters: persistenceUnitName - the name of the persistence unit Returns: the factory that creates EntityManagers configured
JPA Doc
32

javax.persistence.spi.PersistenceUnitInfo

are only transformed once within the same classloading scope, regardless of how many persistence units ... the root of the persistence unit that have not been explicitly listed are to be included in the set of managed classes. Returns whether classes in the root of the persistence unit that have not