61 words
groupBy(grouping) - JPA CriteriaQuery's method
Methodjavax.persistence.criteria.CriteriaQuery
CriteriaQuery<T> groupBy(
List<Expression<?>> grouping
)
Specify the expressions that are used to form groups over
the query results.
Replaces the previous specified grouping expressions, if any.
If no grouping expressions are specified, any previously
added grouping expressions are simply removed.
This method only overrides the return type of the
corresponding
AbstractQuery method.- Parameters:
grouping- list of zero or more grouping expressions
- 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.
