115 | JPA Persistence UnitA 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 |
106 | JPA Persistable TypesThe term persistable types refers to data types that can be used for 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 |
100 | What is the Java Persistence API (JPA)?The Java Persistence API (JPA) is a standard API for accessing databases from within Java ... . Using plain old Java objects (POJO) to represent persistent data can significantly simplify database ... Persistence API (JPA). By interacting with ObjectDB using standard JPA you can keep your application |
36 | javax.persistence.Persistencejavax.persistence Class Persistence java.lang.Object javax.persistence.Persistence Bootstrap class that is used to obtain an EntityManagerFactory in Java SE environments. The Persistence ... bootstrapping APIs is not required in container environments. The Persistence class is used to obtain |
22 | Step 2: Entity Class and Persistence Unit) and selecting New > Entity Class... (or New > Other... > Persistence > Entity Class and clicking ... the [Provider and Database] step just click Finish to generate a default persistence.xml file with a default persistence unit (that will be configured later). If the Finish button is disabled |
22 | Step 2: Entity Class and Persistence Unit) and selecting New > Entity Class... (or New > Other... > Persistence > Entity Class and clicking ... the [Provider and Database] step click Finish to generate a default persistence.xml file with a default persistence unit (that will be configured later). If the Finish button is disabled |
22 | Step 2: Entity Class and Persistence Unit.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity ... ; // Persistent Fields: @Id @GeneratedValue Long id; private String name ... guests in the database. We also need to configure JPA by setting a META-INF/persistence.xml file |
22 | Step 2: Entity Class and Persistence Unit.Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id |
10 | [ODB1] Chapter 3 - Persistent ClassesPersistent Classes are user defined classes whose instances can be stored in a database using JDO. Instances of these classes that represent objects in the database are called persistent objects or persistent instances. Objects that do not represent anything in the database (including instances |
10 | [ODB1] Chapter 6 - Persistent Objects Persistent In JDO applications, every object in memory is either a persistent object, i.e. represents some ... , regardless of its type. Instances of persistent classes can become persistent later, as demonstrated by ... a simple transient object. Then it becomes persistent by an explicit call to the makePersistent |
