• Javax Persistence Query
• Javax Persistence Annotations
• Javax.persistence Foreign Key Generator Parts

Hi Medasha, I read that I can have a reference as an id. Did I misunderstand this? It is practically not possible. There are few reasons behind it: 1. Id needs to be a field or rather say field value. But this reference will create an object actually from where you can accress the whole data of the class for example 'matters.dddist' etc 2.

• Class

Javax Persistence Query

Annotation Type ForeignKey

• 
  
  Used to specify the handling of foreign key constraints when schema generation is in effect. If this annotation is not specified, the persistence provider's default foreign key strategy will be used.

  The ConstraintMode value is used to specify whether foreign key constraints should be generated.

  The syntax used in the foreignKeyDefinition element should follow the SQL syntax used by the target database for foreign key constraints. For example, this may be similar the following:

  When the ConstraintMode value is CONSTRAINT, but the foreignKeyDefinition element is not specified, the provider will generate foreign key constraints whose update and delete actions it determines most appropriate for the join column(s) to which the foreign key annotation is applied.

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  Since:

  Java Persistence 2.1

  See Also:

  JoinColumn, JoinColumns, MapKeyJoinColumn, MapKeyJoinColumns, PrimaryKeyJoinColumn, JoinTable, CollectionTable, SecondaryTable, AssociationOverride

1. Java Persistence API Entities. It is not necessary to explicitly specify this for a join column that corresponds to a primary key that is part of a foreign key.??? @javax.persistence.AttributeOverride & @AttributeOverrides. Defines a primary key generator that may be referenced by name from @GeneratedValue.
2. This chapter takes you through the relationships between Entities. Generally the relations are more effective between tables in the database. Here the entity classes are treated as relational tables (concept of JPA), therefore the relationships between Entity classes are as follows: Many-To-One.
3. If the join is for a OneToMany entity relationship using a foreign key mapping strategy, the foreign key column for the map key is in the table of the entity that is the value of the map. Default: If the map is for an element collection, the name of the collection table for the map value.
4. Estou com o o seguinte problema, preciso fazer o mapeamento relacional de um banco, e nesse banco possui a tabela sessao, a qual possui 2 campos de referencia a tabela sala, como posso realizar esse.
5. If the join is for a OneToOne or ManyToOne mapping using a foreign key mapping strategy, the foreign key column is in the table of the source entity or embeddable. If the join is for a unidirectional OneToMany mapping using a foreign key mapping strategy, the foreign key.

• • Optional Element Summary

    Optional Elements

    Modifier and Type	Optional Element and Description
    String	foreignKeyDefinition
    String	name (Optional) The name of the foreign key constraint.
    ConstraintMode	value (Optional) Used to specify whether a foreign key constraint should be generated when schema generation is in effect.

Javax Persistence Annotations

• • Element Detail

    • name

      (Optional) The name of the foreign key constraint. If this is not specified, it defaults to a provider-generated name.

      Default:

      '

  • • value

      (Optional) Used to specify whether a foreign key constraint should be generated when schema generation is in effect.

      A value of CONSTRAINT will cause the persistence provider to generate a foreign key constraint. If the foreignKeyDefinition element is not specified, the provider will generate a constraint whose update and delete actions it determines most appropriate for the join column(s) to which the foreign key annotation is applied.

      A value of NO_CONSTRAINT will result in no constraint being generated.

      A value of PROVIDER_DEFAULT will result in the provider's default behavior (which may or may not result in the generation of a constraint for the given join column(s).

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      Default:

      javax.persistence.ConstraintMode.CONSTRAINT

  • • foreignKeyDefinition

      Default:

      '

Javax.persistence Foreign Key Generator Parts

• Class

• Summary:
• Field
• Required

• Detail:
• Field

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• Packages that use javax.persistence

  Package	Description
  javax.persistence	Java Persistence is the API for the management for persistence and object/relational mapping.
  javax.persistence.criteria
  javax.persistence.spi	SPI for Java Persistence providers

• Classes in javax.persistence used by javax.persistence

  Class	Description
  AccessType	Used with the Access annotation to specify an access type to be applied to an entity class, mapped superclass, or embeddable class, or to a specific attribute of such a class.
  AssociationOverride	Used to override a mapping for an entity relationship.
  AttributeNode
  AttributeOverride	Used to override the mapping of a Basic (whether explicit or default) property or field or Id property or field.
  Cache	Interface used to interact with the second-level cache.
  CacheRetrieveMode	Used as the value of the javax.persistence.cache.retrieveMode property to specify the behavior when data is retrieved by the find methods and by queries.
  CacheStoreMode	Used as the value of the javax.persistence.cache.storeMode property to specify the behavior when data is read from the database and when data is committed into the database.
  CascadeType	Defines the set of cascadable operations that are propagated to the associated entity.
  Column	Specifies the mapped column for a persistent property or field.
  ColumnResult	Used in conjunction with the SqlResultSetMapping annotation or ConstructorResult annotation to map a column of the SELECT list of a SQL query.
  ConstraintMode
  ConstructorResult	Used in conjunction with the SqlResultSetMapping annotation to map the SELECT clause of a SQL query to a constructor.
  Convert	Specifies the conversion of a Basic field or property.
  DiscriminatorType	Defines supported types of the discriminator column.
  EntityGraph	This type represents the root of an entity graph that will be used as a template to define the attribute nodes and boundaries of a graph of entities and entity relationships.
  EntityManager	Interface used to interact with the persistence context.
  EntityManagerFactory	Interface used to interact with the entity manager factory for the persistence unit.
  EntityResult	Used in conjunction with the SqlResultSetMapping annotation to map the SELECT clause of a SQL query to an entity result.
  EntityTransaction	Interface used to control transactions on resource-local entity managers.
  EnumType
  FetchType	Defines strategies for fetching data from the database.
  FieldResult	Used in conjunction with the EntityResult annotation to map columns specified in the SELECT list of a SQL query to the properties or fields of an entity class.
  FlushModeType
  ForeignKey	Used to specify the handling of foreign key constraints when schema generation is in effect.
  GenerationType	Defines the types of primary key generation strategies.
  Index	Used in schema generation to specify creation of an index.
  InheritanceType
  JoinColumn	Specifies a column for joining an entity association or element collection.
  JoinTable
  LockModeType	Lock modes can be specified by means of passing a LockModeType argument to one of the EntityManager methods that take locks (lock, find, or refresh) or to the Query.setLockMode() or TypedQuery.setLockMode() method.
  MapKeyJoinColumn	Specifies a mapping to an entity that is a map key.
  NamedAttributeNode	A NamedAttributeNode is a member element of a NamedEntityGraph.
  NamedEntityGraph	Used to specify the path and boundaries for a find operation or query.
  NamedNativeQuery
  NamedQuery	Specifies a static, named query in the Java Persistence query language.
  NamedStoredProcedureQuery	Specifies and names a stored procedure, its parameters, and its result type.
  NamedSubgraph	A NamedSubgraph is a member element of a NamedEntityGraph.
  Parameter
  ParameterMode	Specifies the mode of a parameter of a stored procedure query.
  PersistenceContext	Expresses a dependency on a container-managed EntityManager and its associated persistence context.
  PersistenceContextType	Specifies whether a transaction-scoped or extended persistence context is to be used in PersistenceContext.
  PersistenceException	Thrown by the persistence provider when a problem occurs.
  PersistenceProperty	Describes a single container or persistence provider property.
  PersistenceUnit	Expresses a dependency on an EntityManagerFactory and its associated persistence unit.
  PersistenceUnitUtil	Utility interface between the application and the persistence provider managing the persistence unit.
  PersistenceUtil	Utility interface between the application and the persistence provider(s).
  PessimisticLockScope	Defines the values of the javax.persistence.lock.scope property for pessimistic locking.
  PrimaryKeyJoinColumn	Specifies a primary key column that is used as a foreign key to join to another table.
  Query
  QueryHint	Used to supply a query property or hint to the NamedQuery or NamedNativeQuery annotation.
  SecondaryTable	Specifies a secondary table for the annotated entity class.
  SequenceGenerator	Defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation.
  SharedCacheMode	Specifies how the provider must use a second-level cache for the persistence unit.
  SqlResultSetMapping	Specifies the mapping of the result of a native SQL query or stored procedure.
  StoredProcedureParameter	Specifies a parameter of a named stored procedure query.
  StoredProcedureQuery	Interface used to control stored procedure query execution.
  Subgraph	This type represents a subgraph for an attribute node that corresponds to a Managed Type.
  SynchronizationType	Specifies whether the persistence context is always automatically synchronized with the current transaction or whether the persistence context must be explicitly joined to the current transaction by means of the EntityManager.joinTransaction() method.
  TableGenerator	Defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation.
  TemporalType	Type used to indicate a specific mapping of java.util.Date or java.util.Calendar.
  TupleElement	The TupleElement interface defines an element that is returned in a query result tuple.
  TypedQuery	Interface used to control the execution of typed queries.
  UniqueConstraint	Specifies that a unique constraint is to be included in the generated DDL for a primary or secondary table.
  ValidationMode	The validation mode to be used by the provider for the persistence unit.

• Classes in javax.persistence used by javax.persistence.criteria

  Class	Description
  Parameter
  Tuple	Interface for extracting the elements of a query result tuple.
  TupleElement	The TupleElement interface defines an element that is returned in a query result tuple.

• Classes in javax.persistence used by javax.persistence.spi

  Class	Description
  EntityManagerFactory	Interface used to interact with the entity manager factory for the persistence unit.
  SharedCacheMode	Specifies how the provider must use a second-level cache for the persistence unit.
  ValidationMode	The validation mode to be used by the provider for the persistence unit.