About primary key

manual

Deleting JPA Entity Objects

Explains how to use JPA to delete (remove) entity objects from the database.... primaryKey) EntityManager's method Find by primary key. See JavaDoc Reference Page... ( Employee. class , 1 ...

 
api-jpa

javax.persistence.Cache

Interface used to interact with the second-level cache.(Interface of JPA)

 
api-jdo

PrimaryKey.name

Name of the primary key constraint(Annotation Element of javax.jdo.annotations.PrimaryKey)

 
api-jdo

Join.primaryKey

Name for a generated primary key constraint.(Annotation Element of javax.jdo.annotations.Join)

 
api-jdo

Persistent.primaryKey

Whether this member is part of the primary key for application identity.(Annotation Element of javax.jdo.annotations.Persistent)

 
api-jpa

SequenceGenerator.name

(Required) A unique generator name that can be referenced by one or more classes to be the generator for primary key values.(Annotation Element of javax.persistence.SequenceGenerator)

 
forum_thread

Is ObjectDB the only object database that supports JPA?

Other Object database does'nt support JPA?   ... object databases. For example, user defined primary keys and composite primary keys are features of RDBMS (relational databases), which are not ...

 
api-jdo

javax.jdo.annotations.PersistenceCapable

Annotation for whether the class or interface is persistence-capable.(Annotation of JDO)

 
forum_thread

enumeration table? how to on pure jpa?

Hello , I've relational db , and there is some table named enumerations with , some key and values.We will migrate to objectdb. Our problem is , we want to store some keys and values for global application configs. Like; tablename : enumeration table rows: key                value ... , and there is some table named enumerations with , some key and values.We will migrate to objectdb. Our problem is , we want to ... class. The key field could also be set as a primary key for fast and simple access by find : String ...

 
api-jpa

getReference(entityClass, primaryKey)

Get an instance, whose state may be lazily fetched.(Method of javax.persistence.EntityManager)