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JPA Method in javax.persistence.EntityManager T find (   Class  entityClass,    Object  primaryKey ) Find by primary key. Search for an entity of the specified ... from there. Parameters: entityClass - entity class primaryKey - primary key Return: the found entity

JPA Method in javax.persistence.Cache void evict (   Class cls,    Object  primaryKey ) Remove the data for the given entity from the cache. Parameters: cls - entity class primaryKey - primary key Since: JPA 2.0

JPA Method in javax.persistence.Cache boolean contains (   Class cls,    Object  primaryKey ) Whether the cache contains data for the given entity. Parameters: cls - entity class primaryKey - primary key Return: boolean indicating whether the entity is in the cache Since: JPA 2.0

JPA Method in javax.persistence.EntityManager T find (   Class  entityClass,    Object  primaryKey ,     LockModeType  lockMode ) Find by primary ... only statement-level rollback Parameters: entityClass - entity class primaryKey - primary key lockMode - lock

JPA Method in javax.persistence.EntityManager T find (   Class  entityClass,    Object  primaryKey ,    Map  properties ) Find by primary key ... class primaryKey - primary key properties - standard and vendor-specific properties and hints Return

JPA Method in javax.persistence.EntityManager T getReference (   Class  entityClass,    Object  primaryKey ) Get an instance, whose state may be lazily fetched ... while the entity manager was open. Parameters: entityClass - entity class primaryKey - primary key Return

JPA Method in javax.persistence.EntityManager T find (   Class  entityClass,    Object  primaryKey ,     LockModeType  lockMode,    ... class primaryKey - primary key lockMode - lock mode properties - standard and vendor-specific

* * EntityManager.find(entityClass, primaryKey ) is slow when accessing * non-existent IDs. * * Select queries

;Object  primaryKey ) Find by primary key. Search for an entity of the specified class and primary ... there. Parameters: entityClass - entity class primaryKey - primary key Return: the found entity instance or null ... is null Since: JPA 1.0 T find (Class  entityClass, Object  primaryKey ,  LockModeType

T fetch(Company company, Long primaryKey ) {   mLogger.info("Fetching type: {} with id {} with company: {}", new Object[]{managedClass, primaryKey , company});   CriteriaBuilder qb ... "), primaryKey ),     qb.and(qb.equal(p.get("owningCompany"), company)));  

SimpleEntity {     @Id @GeneratedValue private Long primaryKey ;     ... primaryKey ;     }     public void setPrimaryKey(Long primaryKey ) {         this. primaryKey = primaryKey ;     } }    

contains (Class cls, Object  primaryKey ) Whether the cache contains data for the given entity. Parameters: cls - entity class primaryKey - primary key Return: boolean indicating ... void evict (Class cls, Object  primaryKey ) Remove the data for the given entity from

Serializable{ @ PrimaryKey private String name; private int age; ...} @Entity public class Company implements Serializable{ @ PrimaryKey private String name; private Person employee; ...} When I save

JDO Annotation Attribute in javax.jdo.annotations.Persistent String primaryKey default "" Whether this member is part of the primary key for application identity. This is equivalent to specifying @ PrimaryKey as a separate annotation on the member. Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. PrimaryKey String column default "" Name of the column to use for the primary key Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. PrimaryKey String name default "" Name of the primary key constraint Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. PrimaryKey Column [] columns default {} The column(s) for the primary key Since: JDO 2.1

JDO Annotation PrimaryKey Target: ElementType.TYPE, ElementType.FIELD, ElementType.METHOD Implemented Interfaces: Annotation Annotation on a member to define it as a primary key member of a class or persistent interface using application identity. Also used to define the primary key columns

JDO Annotation Attribute in javax.jdo.annotations.Join String primaryKey default "" Name for a generated primary key constraint. Since: JDO 2.1

.getCache().contains(entityClass, primaryKey ) , so you can persist or retrieve an entity object

it should be:     @ PrimaryKey     @Persistent(valueStrategy

implements Serializable { @ PrimaryKey private long id; private String name; protected TestClass() { } public

class MyClass { @ PrimaryKey String id; } Persistent objects with a String primary key (including

and persistent in the embedded usage. Since: JDO 2.1 String primaryKey default "" Whether this member is part of the primary key for application identity. This is equivalent to specifying @ PrimaryKey as

"" Whether to use an outer join. Since: JDO 2.1 String primaryKey default "" Name for a generated primary key