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291

Paths and Types in JPQL and Criteria API

as arguments. Path expressions that navigate from one object to another. Instances of user defined ... . But more often they are used in JPQL path expressions that navigate to values of simple types (number, boolean ... , and they can be used in ordering. Navigation through Path Expressions A path expression always starts
78

javax.persistence.criteria.Path

javax.persistence.criteria Interface Path Superinterfaces: Expression, Selectionpath from a bound type or collection, and is a "primitive" expression. Since: JPA 2.0 Learn how to use JPA criteria API paths in Chapter 4 of the ObjectDB/JPA
72

get(attributeName)

Method javax.persistence.criteria.Path Path get( String attributeName ) Create a path ... the type resulting from the get operation in order to avoid the use of Path variables ... (Person.class); Path > nicknames = p.get("nicknames"); q.select(p) .where(cb.isMember("joe", nicknames
70

get(attribute)

Method javax.persistence.criteria.Path Path get( SingularAttribute attribute ) Create a path corresponding to the referenced single-valued attribute. Parameters: attribute - single-valued attribute Returns: path corresponding to the referenced attribute Since: JPA 2.0
69

type()

Method javax.persistence.criteria.Path Expression> type() Create an expression corresponding to the type of the path. Returns: expression corresponding to the type of the path Since: JPA 2.0
69

getParentPath()

Method javax.persistence.criteria.Path Path getParentPath() Return the parent "node" in the path or null if no parent. Returns: parent Since: JPA 2.0
69

getModel()

Method javax.persistence.criteria.Path Bindable getModel() Return the bindable object that corresponds to the path expression. Returns: bindable object corresponding to the path Since: JPA 2.0
68

get(collection)

Method javax.persistence.criteria.Path Expression get( PluralAttribute collection ) Create a path corresponding to the referenced collection-valued attribute. Parameters: collection - collection-valued attribute Returns: expression corresponding to the referenced attribute Since: JPA 2.0
68

get(map)

Method javax.persistence.criteria.Path Expression get( MapAttribute map ) Create a path corresponding to the referenced map-valued attribute. Parameters: map - map-valued attribute Returns: expression corresponding to the referenced attribute Since: JPA 2.0
55

[ODB1] Chapter 8 - ObjectDB Server

com.objectdb.Server where represents the installation path of ObjectDB. If you add ... <path> : specify a configuration file explicitly -port : override configuration TCP port ... below: You can also specify an explicit path to the configuration file: > java com.objectdb.Server

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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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.

Copyright © 2003, 2010, 2021  ObjectDB Software, all rights reserved. The JPA API Reference Documentation (JavaDoc) on this website 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. The JDO API Reference Documentation (JavaDoc) on this website is derived with some adjustments from the JDO 2.2 API and is available under the terms of the Apache License, v. 2.0. Images on this website are available under these licecnes. Documentation on this website explains how to use JPA in the context of the ObjectDB Object Database but mostly relevant also for ORM JPA implementations, such as Hibernate (and HQL), EclipseLink, TopLink, OpenJPA and DataNucleus. ObjectDB is not an ORM JPA implementation but an Object Database (ODBMS) for Java with built in JPA 2 support.