About primary key

manual

Locking in JPA

Explains how to use optimistic locking and pessimistic locking in JPA.... lockMode) EntityManager's method Find by primary key and lock. See JavaDoc Reference Page... method has a form that ...

 
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

JPA Annotations for Value Generation

Reference (JavaDoc) of JPA 2 value generation annotations, including @GeneratedValue, @SequenceGenerator and @TableGenerator. Automatically generated values are mainly useful for primary key fields, but are supported by ObjectDB also for regular (non primary key) ...

 
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

PrimaryKey.columns

The column(s) for the primary key(Annotation Element of javax.jdo.annotations.PrimaryKey)

 
api-jdo

jdoNewObjectIdInstance()

Create a new instance of the ObjectId class for this PersistenceCapable class and initialize the key fields from the instance on which this method is called.(Method of javax.jdo.spi.PersistenceCapable)

 
api-jpa

CollectionTable.joinColumns

(Optional) The foreign key columns of the collection table which reference the primary table of the entity.(Annotation Element of javax.persistence.CollectionTable)

 
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 ...