ObjectDB Database Search

connection URL. This can be an embedded URL (for example, c:\points.odb ) or a client-server URL ... ) and click Next . Enter a JPQL or a JDOQL query and click Finish . See the Report Generation with BIRT and JPA tutorial for more detailed instructions.

classes as entities, embeddables, or mapped superclasses while configuring caching and listener ... associations between entities, such as one-to-one or many-to-many, and specify cascade and fetch

= c.population * 11 / 10 The UPDATE clause defines exactly one range variable (with or ... . The SET clause defines one or more field-update expressions, which use the range variable

been modified or removed during a transaction are held in the persistence context by weak references ... to use strong or soft references instead of weak references . Use the contains method to check

of the ssl element, which can be set to true or false , specifies whether SSL is used. As shown in ... attribute of the ssl element must be set to true . Every keystore or truststore file is represented by

, an alias cannot be changed or reassigned. Returns the same selection item. Inherited from Selection ... specifying whether duplicate results must be eliminated from the subquery result or ... assigned to the tuple element or null, if no alias has been assigned. Inherited from TupleElement

of EntityManager . A persistence unit defines the set of all classes that are related or grouped by ... may be defined by a persistence.xml file, or it may be defined at runtime via the PersistenceConfiguration API. Every persistence unit has a transaction type , either JTA , or RESOURCE_LOCAL . Resource

: Annotation Target: Method, Field The simplest type of mapping of a persistent field or property to a single database column. The Basic annotation may be applied to a property or instance variable whose type is any one of the following: a Java primitive type, or wrapper of a primitive type, String , java

must: be a non- final top-level class or static inner class, have a public or protected constructor with no parameters, and have no final methods or persistent instance variables. An enum, record, or ... annotation, and may have one or more secondary tables, mapped using the SecondaryTable annotation

the query result or whether they must be retained Returns: the modified query. Since: Jakarta ... getGroupRestriction () Return the predicate that corresponds to the restriction(s) over the grouping items, or null ... () Return the predicate that corresponds to the where clause restriction(s), or null if no restrictions

(whether explicit or default) property or field or Id property or field. May be applied to an entity that extends a mapped superclass or to an embedded field or property to override a basic mapping or id mapping defined by the mapped superclass or embeddable class ( or embeddable class of one of its attributes

: Annotation Target: Method, Field Specifies a column for joining an entity association or element ... ForeignKey foreignKey () (Optional) Used to specify or control the generation of a foreign key ... is for a OneToOne or ManyToOne mapping using a foreign key mapping strategy, the foreign key column is in

, Comparable , Serializable Enumerates the kinds of optimistic or pessimistic lock ... as an argument to: one of the methods of EntityManager which obtains locks ( lock() , find() , or refresh() ), or to Query.setLockMode or TypedQuery.setLockMode . Optimistic locks are specified using

association or element collection at the point when the association or collection is retrieved. The syntax ... [, orderby_item]* orderby_item ::= [property_ or _field_name] [ASC | DESC] If ASC or DESC is not specified, ASC ... , ordering by the primary key of the associated entity is assumed. The property or field name

of multiple persistent fields or properties, across several entities, and so distinct instances ... must: be a non- abstract , non- final top-level class or static inner class, or a Java record type, have a public or protected constructor with no parameters, unless it is a record type, and have no final

: - The represented entity or mapped superclass type. Super Interfaces: ManagedType , Type An instance of the type IdentifiableType represents an entity or mapped superclass type. Since: Jakarta ... the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters

element type is returned. If the bindable type is SINGULAR_ATTRIBUTE or ENTITY_TYPE , the Java type of the represented entity or attribute is returned. Inherited from Bindable Returns: Java type ... ) Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass

, LOWER, MAX, MEMBER, MIN, MOD, NEW, NOT, NULL, NULLIF, OBJECT, OF, OR , ORDER, OUTER, POSITION, SELECT

relational database by using an ORM JPA provider such as Hibernate, EclipseLink or Open JPA

and then using it in one or more fields. Use the @SequenceGenerator annotation to define a sequence

order to interact with a relational database such as Oracle, DB2, SQL Server or MySQL. The popular JPA

, 'Adam' or '' ), and a single quotation mark within a string is represented by two single quotation

or NetBeans . Forget relational databases, JDBC, drivers, tables, records, ORM tools and mapping

experience in database development, SQL or JPA, but such experience is definitely not a prerequisite.

field that is not declared as static or transient is a persistent field. For example, the persistent

result type is unknown or when a query returns polymorphic results whose lowest common denominator

is greater than or equal to 100 are deleted. All other Point objects are updated. Chapter 3

A prior knowledge of database programming (SQL, JDBC, ORM or JPA) is not required in order to follow

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB is a full featured

the number of objects that the query updated or deleted. The Query Structure section provides more details about DELETE and UPDATE queries.

, lib , or build , its parent directory is the ObjectDB home directory ( $objectdb ). As a result

a ServletContextListener to perform initialization and cleanup operations: The database will be opened ( or created ... . The database will be closed when the web application stops ( or when the web server shuts down), by

Project . Run the project: Select  Run Run Main Project... ( or   F6 ). Choose or define

node (in the [Project Explorer] window) and selecting New Folder ( or   New Other... General

This tutorial demonstrates how to create and run a full Java Spring MVC (Model View Controller) web application using Tomcat ( or GlassFish), JPA, ObjectDB and Maven. The demo web application manages a basic guestbook page. Every visitor can sign the guestbook by filling a simple form. All visitors

IDEA: Select the new run configuration at the toolbar and click the green run icon ( or   Shift

editor (by right clicking and selecting  Open With Text Editor or by double click

clicking and selecting Edit or by double click and then moving to the XML tab in the editor window

The  Java EE Web Application tutorial provides step by step instructions on how to build a simple Java/JPA database driven web application (for GlassFish 3/ JBoss 6) in  Eclipse or   NetBeans . Building a new application step by step is an effective way to learn - but 

, such as GlassFish 3.0.1 or JBoss AS 6. Another tutorial shows how to use JPA in a Spring MVC Framework

when the Maven project is imported into the IDE). Choose or define the server and click  Finish

Operations on the database will be performed by an instance of a session bean (EJB) class that we will define in this step: Open the [New Session Bean] dialog box by right clicking the guest package node (in the [Projects] window), selecting New Other... Java EE ( or Enterprise JavaBeans) Session

Start tutorial ). Specify an ObjectDB connection url - either embedded (e.g. c:\points.odb ) or client

project is imported into the IDE). Choose or define the server and click  Finish . Eclipse

you will need the following software: Java JDK (6.0 or above). Eclipse IDE for Java EE Developers Apache

The Getting Started with JPA tutorial provides step by step instructions on how to build a simple JPA database driven application in Eclipse or NetBeans . Building a new application step by step is an effective way to learn - but if you prefer, you may download and run the result

the project in NetBeans: Select Run Run Main Project... ( or F6 ). Click Select Main Class .

. Run the project in IntelliJ IDEA: Select Run Run Main Project... ( or F6 ). Click Select Main Class .

is imported into the IDE). Choose or define the server and click Finish . Eclipse should open an internal

We start by creating a new Java EE 6 Web Application project in NetBeans: Open the [New Project] dialog box, e.g. by using File New Project... Select Java Web Web Application and click Next . Choose a Project Name (e.g. Guestbook ) and click Next . Select GlassFish Server 3 ( or above)