Jakarta Persistence Query Language: Difference between revisions

Revision as of 23:19, 30 July 2020

Revision as of 23:31, 30 July 2020

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{{noref|date=June 2010}}

{{Infobox programming language

| name = JavaJakarta Persistence Query Language

| logo =

| paradigm =

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| implementations =

| dialects =

| influenced_by = [[SQL]], [[Hibernate_Hibernate (Java)#Hibernate_Query_LanguageHibernate Query Language (HQL)|Hibernate]]

| influenced =

| operating_system = [[Cross-platform]]

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| website =

}}

The '''JavaJakarta Persistence Query Language''' ('''JPQL'''; formerly Java Persistence Query Language) is a platform-independent [[object-oriented]] [[query language]] defined as part of the [[JavaJakarta Persistence API]] (JPA; formerly Java Persistence API) specification.

JPQL is used to make queries against entities stored in a relational database. It is heavily inspired by [[SQL]], and its queries resemble SQL queries in syntax, but operate against JPA entity objects rather than directly with database tables.

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==Hibernate Query Language==

JPQL is based on the [[Hibernate_Hibernate (Java)#Hibernate_Query_Language_Hibernate Query Language (HQL)|Hibernate Query Language]] (HQL), an earlier non-standard query language included in the [[Hibernate (Java)|Hibernate]] [[object-relational mapping]] library.

Hibernate and the HQL were created before the JPA specification.

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* [[Object-relational mapping]]

* [[Hibernate (framework)]]

* [[JavaJakarta Persistence API]]

* [[ActiveJPA]]

== External links ==

* {{official website}}

** [https://docseclipse-ee4j.oraclegithub.com/javaee/6io/jakartaee-tutorial/doc/bnbufpersistence-querylanguage006.html Full Query Language Syntax from The JavaJakarta EE 68 Tutorial]

* [https://www.objectdb.com/java/jpa/query JPA Queries and JPQL - a chapter of the ObjectDB Manual]

* [https://torpedoquery.org/ Type safe Hibernate (HQL) query engine - TorpedoQuery]