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5 de dic. de 2023 · En Java Persistence API el fichero persistence.xml define la conexion a la base de datos y las entidades que vamos a considerar salvables en ella. Como resultado de ambos conceptos se genera un objeto EntityManagerFactory que se encargará de guardar todas estas entidades para la base de datos.
Applied to a persistent field or property of an entity class or mapped superclass to denote a composite primary key that is an embeddable class. Entity Specifies that the class is an entity.
2 de feb. de 2020 · The Java Persistence API (JPA), in 2019 renamed to Jakarta Persistence, is a Java application programming interface specification that describes the management of relational data in applications using Java Platform, Standard Edition and Java Platform, Enterprise Edition/Jakarta EE.
The Java Persistence API (JPA) is one possible approach to ORM. Via JPA the developer can map, store, update and retrieve data from relational databases to Java objects and vice versa. JPA can be used in Java-EE and Java-SE applications. JPA is a specification and several implementations are available.
javax.persistence.Persistence public class Persistence extends Object Bootstrap class that is used to obtain an EntityManagerFactory in Java SE environments.
The Java Persistence API provides a POJO persistence model for object-relational mapping. The Java Persistence API was developed by the EJB 3.0 software expert group as part of JSR 220, but its use is not limited to EJB software components.
The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit. A persistence unit defines the set of all classes that are related or grouped by the application, and which must be colocated in their mapping to a single database.
