 204 | 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 |
201 | ) 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 |
201 | ) 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 |
200 | .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 |
200 | 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 |
200 | .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 |
190 | 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 |
82 | javax.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 |
80 | Constructor javax.persistence.Persistence Persistence() Since: JPA 1.0 |
80 | Static Field javax.persistence.Persistence String PERSISTENCE_PROVIDER Deprecated. This final String is deprecated and should be removed and is only here for TCK backward compatibility Since: JPA 1.0 |