88 words
distinct(distinct) - JPA CriteriaQuery's method
Methodjavax.persistence.criteria.CriteriaQuery
CriteriaQuery<T> distinct(
boolean distinct
)
Specify whether duplicate query results will be eliminated.
A true value will cause duplicates to be eliminated.
A false value will cause duplicates to be retained.
If distinct has not been specified, duplicate results must
be retained.
This method only overrides the return type of the
corresponding
AbstractQuery method.- Parameters:
distinct- boolean value specifying whether duplicate results must be eliminated from the query result or whether they must be retained
- Returns:
- the modified query.
- Since:
- JPA 2.0
This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
Object DB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.
Which JPA is Faster?
See a comparison of Hibernate, EclipseLink, OpenJPA, DataNucleus, MySQL, PostgreSQL, Derby, HSQLDB, DB4O by Versant, H2 Database, SQLite and ObjectDB
in the JPA Benchmark.
