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This document is intended for application developers who want to developapplications using EclipseLink with Java Persistence Architecture (JPA).This document does not include details about related common tasks, butfocuses on EclipseLink functionality.
This chapter introduces EclipseLink. EclipseLink is an advanced,object-persistence and object-transformation framework that providesdevelopment tools and run-time capabilities that reduce development andmaintenance efforts, and increase enterprise application functionality.
EclipseLink is suitable for use with a wide range of Java EnterpriseEdition (Jakarta EE) and Java application architectures. Use EclipseLinkto design, implement, deploy, and optimize an advancedobject-persistence and object-transformation layer that supports avariety of data sources and formats, including the following:
The EclipseLink runtime lets your application exploit this mappingmetadata with a simple session facade that provides in-depth support forstandard APIs such as JPA, and JAXB as well as EclipseLink-specificextensions to those standards.
This document explains the EclipseLink enhancements and extensions toJPA. Please refer to the JPA specification for full documentation ofcore JPA. Where appropriate, this documentation provides links to thepertinent section of the specification.
This chapter includes information on the EclipseLink extensions to theJakarta Persistence API (JPA) annotations. EclipseLink supports theJakarta Persistence API (JPA) 2.0 specification. It also includes manyenhancements and extensions.
You can define additional criteria on entities or mapped superclass.When specified at the mapped superclass level, the additional criteriadefinition applies to all inheriting entities, unless those entitiesdefine their own additional criteria, in which case those defined forthe mapped superclass are ignored.
Additional criteria can provide an additional filtering mechanism forqueries. This filtering option, for example, allows you to use anexisting additional JOIN expression defined for the entity or mappedsuperclass and allows you to pass parameters to it.
Set additional criteria parameters through properties on the entitymanager factory or on the entity manager. Properties set on the entitymanager override identically named properties set on the entity managerfactory. Properties must be set on an entity manager before executing aquery. Do not change the properties for the lifespan of the entitymanager.
Specify additional criteria using the @AdditionalCriteria annotationor the element. The additional criteriadefinition supports any valid JPQL string and must use this as analias to form the additional criteria. For example:
In a multitenancy environment, tenants (users, clients, organizations,applications) can share database tables, but the views on the data arerestricted so that tenants have access only to their own data. You canuse additional criteria to configure such restrictions.
For a shared table, there may be inheritance in the table but not in theobject model. For example, a SavingsAccount class may be mapped to anACCOUNT table, but the ACCOUNT table contains both savings accountdata (SAVINGS) and checking account (CHECKING) data. You can useadditional criteria to filter out the checking account data.
When using BatchFetchType=IN, EclipseLink selects only objects notalready in the cache. This method may work better with cursors orpagination, or in situations in which you cannot use a JOIN. On somedatabases, this may only work for singleton IDs.
Use @Cache (in place of the JPA @Cachable annotation) to configurethe EclipseLink object cache. By default, EclipseLink uses a sharedobject cache to cache all objects. You can configure the caching typeand options on a per class basis to allow optimal caching.
(Optional) Set to a boolean value of true to force all queries that goto the database to refresh the cache only if the data received from thedatabase by a query is newer than the data in the cache (as determinedby the optimistic locking field)
A cache index allows singleResult queries to obtain a cache hit whenquerying on the indexed fields. A resultList query cannot obtain cachehits, as it is unknown if all of the objects are in memory, (unless thecache usage query hint is used).
Once set, the specified class will receive all caching calls. ExistingEclipseLink cache settings will continue to be used, any calls allowedto continue to the EclipseLink cache will execute against the configuredcache.
Use @ChangeTracking to specify theorg.eclipse.persistence.descriptors.changetracking.ObjectChangePolicy.This policy computes change sets for the EclipseLink commit process andoptimizes the transaction by including objects in the change setcalculation that have at least one changed attribute.
Use this annotation to configure an alternative change policy, if theautomatic policy is having issues with your application. Using@ChangeTracking may improve commit performance for objects with fewattributes or objects with many changed attributes.
If you are mapping to an existing database, and the tables do not have adiscriminator column you can still define inheritance using the@ClassExtractor annotation or element. The classextractor takes a class that implements the ClassExtractor interface.An instance of this class is used to determine the class type to use fora database row. The class extractor must define a extractClassFromRowmethod that takes the database Record and Session.
If a class extractor is used with SINGLE_TABLE inheritance, the rowsof the class type must be able to be filtered in queries. This can beaccomplished by setting an onlyInstancesExpression orwithAllSubclassesExpression for branch classes. These can be set toExpression objects using a DescriptorCustomizer.
It should be used if target type is a primitive type and@CollectionTable designates the table that belongs to composite memberpersistence unit other than the source composite member persistenceunit. This allows the source and target to be mapped to differentdatabases.
The JPA specification allows you to map an Enum to database columnsusing the @Enumerated annotation, when the database value is eitherthe name of the Enum or its ordinal value. With EclipseLink, you canalso map an Enum to a coded value, using a converter.
Use @Converter to define a named converter that can be used withmappings. A converter can be defined on an entity class, method, orfield. Specify a converter with the @Convert annotationon a Basic or ElementCollection mapping.
Use @DeleteAll to indicate that when an relationship is deleted,EclipseLink should use a delete all query. This typically happens if therelationship is PrivateOwned and its owner is deleted. In that case,the members of the relationship will be deleted without reading them in.
Use @ExcludeDefaultMappings to specify that no default mapping shouldbe added to a specific class. Instead, EclipseLink will use onlymappings that are explicitly defined by annotations or the XML mappingfile.
On merge() operations, use @ExistenceChecking to specify ifEclipseLink uses only the cache to determine if an object exists, or ifthe object should be read (from the database or cache). By default theobject will be read from the database.
You can define more than one fetch group for a class. You can optionallydesignate at most one such fetch group as the default fetch group. Ifyou execute a query without specifying a fetch group, EclipseLink willuse the default fetch group, unless you configure the query otherwise.
Before using fetch groups, it is recommended that you perform a carefulanalysis of system use. In many cases, the extra queries required toload attributes not in the fetch group could well offset the gain fromthe partial attribute loading.
The persistence unit properties support adding named connection pools inaddition to the existing configuration for read/write/sequence. A namedconnection pool must be defined for each node in the database cluster.
If a transaction modifies data from multiple partitions, you should useJTA to ensure proper two-phase commit of the data. You can alsoconfigure an exclusive connection in the EntityManager to ensure thatonly a single node is used for a single transaction.
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