Jakarta Persistence Query Language: Difference between revisions

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{{norefinline|date=June 2010}}

{{Infobox programming language

| name = JavaJakarta Persistence Query Language

| logo =

| paradigm =

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| latest_test_version =

| latest_test_date =

| turing-complete = No

| typing =

| 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 =

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The '''JavaJakarta Persistence Query Language''' ('''JPQL'''; formerly Java Persistence Query Language) is a platform-independent [[Object-oriented programming|object-oriented]] [[query language]]{{sfn|Bauer|King|Gregory|2016}}{{rp|loc=§12|p=284}} 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,{{sfn|Bauer|King|Gregory|2016}}{{rp|loc=§1.3|p=17}} but operate against JPA entity objects rather than directly with database tables.{{sfn|Bauer|King|Gregory|2016}}{{rp|loc=§2.2.3|p=26}}

In addition to retrieving objects (<code>SELECT</code> queries), JPQL supports set based <code>UPDATE</code> and <code>DELETE</code> queries.

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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.

As of Hibernate 3 JPQL is a subset of HQL.

==Citations==

{{Reflist}}

==References==

*{{citation

|last1 = Bauer

|first1 = Christian

|last2 = King

|first2 = Gavin

|last3 = Gregory

|first3 = Gary

| year = 2016

| title = Java Persistence with Hibernate

| edition = Second

| publisher = [[Manning Publications]]

| isbn = 978-1617290459

| url =

}}

==See also==

* [[Object-relational mapping]]

* [[Hibernate (framework)]]

* [[JavaJakarta Persistence API]]

* [[ActiveJPA]]

== External links ==

* {{official website}}

** [https://docseclipse-ee4j.oraclegithub.com/javaee/6io/jakartaee-tutorial/doc/bnbuf.html#full-query-language-syntax 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]