ObjectDB Database Search

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.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.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.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 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 ,     LockModeType  lockMode,    ... class primaryKey - primary key lockMode - lock mode properties - standard and vendor-specific

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

* * 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.Join String primaryKey default "" Name for a generated primary key constraint. 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. PrimaryKey String name default "" Name of the primary key constraint 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 Column [] columns default {} The column(s) for the primary key 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