Interface for extracting the elements of a query result tuple. Interface used to control the execution of typed queries. Defines strategies for fetching data from the database. Defines the types of primary key generation strategies. Specifies the mode of a parameter of a stored procedure query. The validation mode to be used by the provider for the persistence unit. Thrown by the persistence provider when an optimistic locking conflict occurs.
Thrown by the persistence provider when a problem occurs. Thrown by the persistence provider when an pessimistic locking conflict occurs. Used to override a mapping for an entity relationship. Used to override mappings of multiple relationship properties or fields. Used to override mappings of multiple properties or fields.
Specifies the mapped column for a persistent property or field. Specifies the conversion of a Basic field or property. Specifies that the annotated class is a converter and defines its scope. Specifies a collection of instances of a basic type or embeddable class. Used in schema generation to specify creation of an index.
Specifies the inheritance strategy to be used for an entity class hierarchy. Specifies a column for joining an entity association or element collection. Specifies a many-valued association with many-to-many multiplicity. Specifies the enum type for a map key whose basic type is an enumerated type. Used to specify the path and boundaries for a find operation or query. Used to group NamedEntityGraph annotations. Specifies multiple named Java Persistence query language queries.
Specifies a static, named query in the Java Persistence query language. Specifies and names a stored procedure, its parameters, and its result type.
Eclipse can't find javax. Entity even though jar is present Ask Question. Asked 3 years, 10 months ago. Active 3 years, 5 months ago. Viewed 2k times. Improve this question. Clearly not in the classpath. Add a comment. Active Oldest Votes. The JPA persistence provider translates the Java persistence query language statement to the appropriate database SQL statement when the application is deployed. Thus, the JPA persistence provider is responsible for converting the entity name and the names of its persistent fields to the appropriate database table and column names.
Java persistence query language is portable to all databases supported by OC4J. OC4J provides complete support for Java persistence query language with the following important features:. Automatic Code Generation: Java persistence query language queries are defined in the deployment descriptor of the entity bean. When enterprise beans are deployed to Oracle Application Server, the container automatically translates the queries into the SQL dialect of the target data store.
Due to this translation, entity beans with container-managed persistence are portable: their code is not tied to a specific type of a data store. Relationships: Oracle Application Server supports Java persistence query language for both single entity beans and also with entity beans that have relationships, with support for any type of multiplicity and directionality.
Using EJB 3. Native SQL is appropriate for taking advantage of advanced query features of your underlying relational database that Java persistence query language does not support. Skip Headers. What is a JPA Entity? An entity has the following characteristics: it is EJB 3. How do you Avoid Database Resource Contention? An entity relationship has the following characteristics: Multiplicity—there are four types of multiplicities all of which are supported by Oracle Application Server: one-to-one, many-to-one, one-to-many, and many-to-many.
Figure shows the life cycle of a JPA entity. PostPersist This optional method is invoked for an entity after the corresponding EntityManager persist operation is executed. PreRemove This optional method is invoked for an entity before the corresponding EntityManager remove operation is executed.
PostRemove This optional method is invoked for an entity after the corresponding EntityManager remove operation is executed. PreUpdate This optional method is invoked before the database update operation on entity data.
PostUpdate This optional method is invoked after the database update operation on entity data. PostLoad This optional method is invoked after the entity has been loaded into the current persistence context from the database or after the refresh operation has been applied to it and before a query result is returned or accessed or an association is traversed.
All fields within the primary key are restricted to the following: primitive object types; serializable types; types that can be mapped to SQL types. Note: Once the primary key for an entity bean has been set, the EJB 3. A persistence context is a set of entity instances in which for any persistent entity identity there is a unique entity instance. Within the persistence context, the entity instances and their lifecycle are managed.
The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities. The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit. A persistence unit defines the set of all classes that are related or grouped by the application, and which must be colocated in their mapping to a single database.
Since: Java Persistence 1. Object entity Check if the instance is a managed entity instance belonging to the current persistence context. String graphName Return a mutable copy of the named EntityGraph. String name, java. String name Create an instance of StoredProcedureQuery for executing a stored procedure in the database. String sqlString, java. String qlString Create an instance of Query for executing a Java Persistence query language statement.
String qlString, java. String procedureName Create an instance of StoredProcedureQuery for executing a stored procedure in the database. String procedureName, java. Object entity Remove the given entity from the persistence context, causing a managed entity to become detached. Object primaryKey Find by primary key. Object primaryKey, java. Object getDelegate Return the underlying provider object for the EntityManager , if available.
String graphName Return a named EntityGraph. FlushModeType getFlushMode Get the flush mode that applies to all objects contained in the persistence context. Object entity Get the current lock mode for the entity instance. Metamodel getMetamodel Return an instance of Metamodel interface for access to the metamodel of the persistence unit. Object primaryKey Get an instance, whose state may be lazily fetched. Object entity, LockModeType lockMode Lock an entity instance that is contained in the persistence context with the specified lock mode type.
Object entity, LockModeType lockMode, java. Object entity Make an instance managed and persistent. Object entity Refresh the state of the instance from the database, overwriting changes made to the entity, if any. Object entity, java. Object entity, LockModeType lockMode Refresh the state of the instance from the database, overwriting changes made to the entity, if any, and lock it with respect to given lock mode type. Object entity Remove the entity instance. String propertyName, java. Object value Set an entity manager property or hint.
Parameters: entity - entity instance Throws: EntityExistsException - if the entity already exists. If the entity already exists, the EntityExistsException may be thrown when the persist operation is invoked, or the EntityExistsException or another PersistenceException may be thrown at flush or commit time.
IllegalArgumentException - if the instance is not an entity TransactionRequiredException - if there is no transaction when invoked on a container-managed entity manager of that is of type PersistenceContextType.
Parameters: entity - entity instance Returns: the managed instance that the state was merged to Throws: java. IllegalArgumentException - if instance is not an entity or is a removed entity TransactionRequiredException - if there is no transaction when invoked on a container-managed entity manager of that is of type PersistenceContextType. Parameters: entity - entity instance Throws: java.
IllegalArgumentException - if the instance is not an entity or is a detached entity TransactionRequiredException - if invoked on a container-managed entity manager of type PersistenceContextType. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context, it is returned from there. Parameters: entityClass - entity class primaryKey - primary key Returns: the found entity instance or null if the entity does not exist Throws: java.
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