About persistence unit

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Manual
398

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
376

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
376

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
368

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
Tutorial
368

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
JDO Doc
92

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
89

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
79

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
Manual
78

Database Connection using JPA

of the createEntityManagerFactory method takes a map of persistence unit properties as a second parameter: Mappersistence unit. As an extension, ObjectDB enables specifying a database url (or path) directly, bypassing the need for a persistence unit. Any string that starts with objectdb: or ends with .odb or
Manual
59

JPA Persistable Types

The term persistable types refers to data types that can be used in storing data in the database. ObjectDB supports all the JPA persistable types, which are: User defined classes - Entity classes ... can be stored in the database directly. Other persistable types can be embedded in entity classes as fields. In