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JPA Persistence Unit

A JPA Persistence Unit is a logical grouping of user defined persistable classes ... > persistence.xml Persistence units are defined in a persistence.xmlpersistence.xml file can include definitions for one or more persistence units. The portable way

Step 2: Entity Class and Persistence Unit

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.xmlpersistence/persistence_2_0.xsd"> <persistence-unit

Step 2: Entity Class and Persistence Unit

persistence unit (that will be configured later). If the Finish button is disabled ... () { return name + " (signed on " + signingDate + ")"; } } A default JPA persistence unit ... /xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction

Step 2: Entity Class and Persistence Unit

/persistence"> <persistence-unit ... ; </persistence-unit> </persistence> Now ObjectDB should be used as ... .sql.Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax

Step 2: Entity Class and Persistence Unit

.xsd"> <persistence-unit name="GuestbookPU" transaction-type="RESOURCE_LOCAL"> < ... " value="admin"/> </properties> </persistence-unit> </persistence> ... ; import; import java.sql.Date; import javax.persistence.Entity; import javax

Database Connection using JPA

-unit#persistence.xml">persistence unit properties as a second parameter: persistence-unit">persistence 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


">javax.jdo.ConstantsString PMF_ATTRIBUTE_PERSISTENCE_UNIT_NAME The name of the persistence manager factory element's "persistence-unit-name" attribute.


Static Field javax.jdo.ConstantsString PROPERTY_PERSISTENCE_UNIT_NAME "javax.jdo

[ODB1] Chapter 3 - Persistent Classes

Persistent Classes are user defined classes whose instances can be stored in a database ... >persistent objects or persistent instances. Objects that do not represent anything in the database (including instances of persistent classes that live only in memory) are called transient

[ODB1] Chapter 6 - Persistent Objects

Persistent In JDO applications, every object in memory is either a persistent object, i.e ... > operator, it always starts as a transient object, regardless of its type. Instances of persistent classes can become persistent later, as demonstrated by the following code: pm