About performance

page

Company

... Software is the market leader in providing very high performance persistence solution for Java, based on the Java Persistence API ... start-ups, governments and defence forces. When database performance matters - ObjectDB Software provides the most effective solution. ...

 
forum_thread

Duplicate a table

Hello, I would like to know if it's possible to copy the content of a table representing one class of object to another table whithout having to use java object (no object instantiation) ? In fact, I would like to execute a native query like "select * into T0 from T1" My purpose is to backup a table before erasing the content. Thanks. ... code for this purpose. Use enhanced classes to get best performance in reading and writing the objects. The impact of object instantiation on performance should be minor. ObjectDB Support ...

 
api-jpa

javax.persistence.criteria.Root

A root type in the from clause.(Interface of JPA)

 
api-jpa

javax.persistence.criteria.ListJoin

The ListJoin interface is the type of the result of joining to a collection over an association or element collection that has been specified as a java.util.List.(Interface of JPA)

 
api-jpa

javax.persistence.criteria.Predicate

The type of a simple or compound predicate: a conjunction or disjunction of restrictions.(Interface of JPA)

 
api-jpa

javax.persistence.criteria.PluralJoin

The PluralJoin interface defines functionality that is common to joins to all collection types.(Interface of JPA)

 
api-jpa

javax.persistence.criteria.Expression

Type for query expressions.(Interface of JPA)

 
api-jpa

javax.persistence.criteria.CollectionJoin

The CollectionJoin interface is the type of the result of joining to a collection over an association or element collection that has been specified as a java.util.Collection.(Interface of JPA)

 
api-jpa

javax.persistence.criteria.CriteriaBuilder.In

Interface used to build in predicates.(Interface of JPA)

 
api-jpa

lock(entity, lockMode, properties)

Lock an entity instance that is contained in the persistence context with the specified lock mode type and with specified properties.(Method of javax.persistence.EntityManager)