ObjectDB Database Search

The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual objects and fields. The position of a GROUP BY ... clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects

The ORDER BY clause specifies a required order for the query results. Any JPQL query that does not include an ORDER BY clause produces results in an undefined and non-deterministic order. ORDER BY ... is at least one million people, ordered by the country name: SELECT c.name FROM Country c WHERE c.population 1000000

In this step we will add a main class to the project to store and retrieve Point objects from the database: Right click the tutorial package in the [Package Explorer] window and select New Class . The package name should be tutorial . Enter Main as the class name (case sensitive). Click Finish

In this step we will add code to the Main class (that was generated with the project) in order to store Point objects in the database and then retrieve them from the database. Use copy and paste to replace the content of the Main class with the following content: package tutorial; import javax

the Service. By using the Service, You agree to the collection and use of information in accordance ... files that are placed on Your computer, mobile device or any other device by a website, containing ... individuals employed by the Company to facilitate the Service, to provide the Service on behalf

language. For step by step instructions on using BIRT with ObjectDB see the  Report Generation ... Developers extension. To install it: Open the [Install] dialog box by selecting Help Install New Software ... and press ENTER. Select the ObjectDB Birt/ODA feature. Complete the installation by clicking Next twice

: These tutorials provide step by step instructions on how to start using JPA in your IDE ... This chapter demonstrates basic ObjectDB and JPA concepts by introducing a simple example program ... that contains points in the plane. Each point is represented by an object with two int fields, x and y

Please read carefully this software license agreement. By downloading, installing or using ... of this agreement will be binding, unless in writing and signed by an authorized representative of each party. 1 ... other humanly perceivable form. The Customer will use its best efforts and take all reasonable steps

In JPA a database connection is represented by the EntityManager interface. Therefore, in order ... an EntityManager instance consists of two steps . First we need to obtain an instance ... by ObjectDB to be a database URL rather than a persistence unit name. The $objectdb variable

What are the steps of creating small web app?

that can be referenced by ID, and meets a uniform and powerful IElement interface. - The BooleanValue is doing a heap ... to do it this way; but the wrapped boolean value is not the whole story.   webel Dr Darren Kelly By JVM ... -Djava.compiler=NONE webel Dr Darren Kelly OK. It could still be an optimization that is used by the JVM

: Query plan 1/128 description ============================ Step 1: Process ObjectNode (o) instances ---------------------------------------- [ Step 1a] Scan index com.agile.hummingbird.ObjectNode ... )'). [ Step 1b] Retrieve fields in ObjectNode (o) instances. Step 2: Process ObjectProperty (v$2

The  JPA Web Application tutorial provides step by step instructions on how to build a simple ... . Building a new application step by step is an effective way to learn - but if you prefer ... ) If  Maven is installed - extract the zip and run the application from the command line by

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 ... ) If Maven is installed - extract the zip and run the application from the command line by : mvn test

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 

The  Spring MVC JPA tutorial provides step by step instructions on how to build a simple Java/JPA Spring MVC database driven web application in  Eclipse or  NetBeans . Building a new application step by step is an effective way to learn - but if you prefer

a basic guestbook page. Every visitor can sign the guestbook by filling a simple form. The visitors that have already signed are listed below the form: Persistence is managed by JPA. Every visitor that has signed the guestbook is represented by a  Guest JPA entity object and all the  Guest

application manages a basic guestbook page. Every visitor can sign the guestbook by filling a simple form. The visitors that have already signed are listed below the form: Persistence is managed by JPA. Every visitor that has signed the guestbook is represented by a Guest entity object

manages a basic guestbook page. Every visitor can sign the guestbook by filling a simple form. The visitors that have already signed are listed below the form: Persistence is managed by JPA. Every visitor that has signed the guestbook is represented by a Guest JPA entity object and all the Guest

can sign the guestbook by filling a simple form. The visitors that have already signed are listed below the form: Persistence is managed by JPA. Every visitor that has signed the guestbook is represented by a Guest entity object and all the Guest entity objects are stored in an ObjectDB database

. The demo web application manages a basic guestbook page. Every visitor can sign the guestbook by ... is managed by JPA. Every visitor that has signed the guestbook is represented by a Guest entity object ... but the code would be the same). The Tutorial Steps This tutorial consists of the following steps :

. Every visitor can sign the guestbook by filling a simple form. The visitors that have already signed are listed below the form: Persistence is managed by JPA. Every visitor that has signed the guestbook is represented by a Guest entity object and all the Guest entity objects are stored in

3 web application: Spring MVC and JPA Maven Projects for Download The tutorials provide  step by step instructions on how to create the sample applications. In addition, the sample applications

--------------------- Group the results of step 5 by : a.endDate,v$1.nodePath,v$3.doubleValue. Step 7: Apply ... .properties.name = 'scheduledSlot') GROUP BY a.endDate, a.objectsInCharge.nodePath, a.objectsInCharge ... we can see that this index is not used: Query Plan Description ====================== Step 1: Process

directory a path to it has to be specified. Alternatively, you can run the Explorer by double clicking explorer.jar or by running explorer.exe (on Windows) or explorer.sh (on Unix/Linux, after editing ... command. By default, when the Explorer starts it tries to open a connection to the most recently used

Description ====================== Step 1: Process IndividualContact ($1) instances ------------------------------------------------ [ Step 1a] Scan type com.quasado.foundation.communication.api.model.contact.individual.IndividualContact locating all the IndividualContact ($1) instances. [ Step 1b

of entity classes and to keep them as simple as possible. Retrieval by Class and Primary Key Every entity object can be uniquely identified and retrieved by the combination of its class and its primary key ... method except that if the entity object is not already managed by the EntityManager a hollow object

.classIdentifier='(TC)')). [ Step 1b] Order the results of step 1a by :   v$1. [ Step 1c] Scan index com.agile ... )')). [ Step 1d] Order the results of step 1c by :   v$1. [ Step 1e] Merge the results of steps 1b ... results --------------------- Group the results of step 4 by :   o. [ Step 6] Remove duplicates

the size by which to extend the database file when additional space is needed. Small initial size and resize values save space. Larger values can improve performance by reducing file fragmentation (many ... When enabled, a recovery file is created by ObjectDB when a database is opened and deleted by ObjectDB

the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright ... and all other entities that control, are controlled by , or are under common control with that entity

(Mapped By ) fields Primary key (ID) fields Version field The first three groups (transient ... -final entity field is persistent by default unless explicitly specified otherwise (e.g. by using ... . Only the persistent state of the entity object, as reflected by its persistent fields (including

update collisions resulting from simultaneous updates to the same data by two concurrent users. Locking ... by another transaction. When using ObjectDB, optimistic locking is enabled by default and fully ... is automatically increased by one. Version numbers are managed internally but can be exposed by defining

are represented in queries by entity names . By default, the entity name is the unqualified name ... can be set explicitly by using the name attribute of the Entity annotation: @Entity ( name ="MyName ... superclasses are treated by ObjectDB as ordinary entity classes. Mapped superclasses are really

ObjectDB Enhancer is a post compilation tool that improves performance by modifying the byte code ... (and actually required by JPA but not enforced by ObjectDB) to avoid accessing persistent fields ... should be used (e.g. by using the get and set methods). If you follow this practice only user defined

additions to the Program originate from and are distributed by that particular Contributor. A Contribution 'originates' from a Contributor if it was added to the Program by such Contributor itself or ... entity that distributes the Program. "Licensed Patents" mean patent claims licensable by

well (dialog boxes and menus might look slightly different but the code would be the same). This tutorial consists of the following steps :

well (dialog boxes and menus might look slightly different but the code would be the same). This tutorial consists of the following steps :

the database is uniquely identified (and can be retrieved from the database) by the combination of its type ... and do not have their own separate identity. Automatic Primary Key By default, the primary key is a sequential 64 bit number ( long ) that is set automatically by ObjectDB for every new entity object

New entity objects can be stored in the database either explicitly by invoking the persist method ... is committed. An IllegalArgumentException is thrown by persist if the argument is not an instance of an entity ... is thrown. The exception is thrown either by persist (if that existing entity object is currently

) The following method retrieves a Country object from the database by its name: public Country ... method supports method chaining ( by returning the same TypedQuery instance on which it was invoked ... identified in a query string by their special form, which is a colon (:) followed by a valid JPQL

classes) are represented in JPQL by the following types of expressions: Variables - FROM ... and functions (e.g. for strings and for numbers ), they can be compared by all six comparison operators ... with an instance of a user defined class (represented by a variable, parameter or prefix path

Detached entity objects are objects in a special state in which they are not managed by any ... ). Retrieval by navigation from detached objects is not supported, so only persistent fields ... EntityManager . In addition, in JPA 2 we can detach an entity object by using the detach method: em. detach

at the WHERE clause level by using a type expression . For example, in the following query, c iterates ... , and the same query can also be written as follows: SELECT c FROM Country c By default, the name ... name). The default name can be overridden by specifying another name explicitly in the @Entity 's

an entity object that is already managed by the  EntityManager returns the existing instance from ... objects, which is managed by the EntityManagerFactory and shared by all its EntityManager objects ... . The scope of these server side caches is wider, since they exist per database and are shared by

A connection to a database is represented by an EntityManager instance, which also provides ... . An EntityManagerFactory is constructed for a specific database, and by managing resources efficiently (e.g ... the content of a database require active transactions. Transactions are managed by an EntityTransaction

its own notation (which is also in use by JDOQL, the JDO Query Language). ObjectDB supports both forms ... by these operators. Comparing NULL values The following table shows how NULL values are handled by ... IS NULL and IS NOT NULL operators which are provided by JPQL (and SQL): c.president IS NULL c.president

Databases are also supported by ObjectDB. The combination of Object Database features ... (limited only by operating system resources). Unlimited CPUs and cores. Reliability and Stability Recovery from failure by using a  recovery file and double writing. Additional recovery layer

and are invoked automatically by JPA when these events occur. Internal Callback Methods Internal callback ... - after an entity has been retrieved from the database. @PreUpdate - when an entity is identified as modified by ... for the same event. However, the same method may be used for multiple callback events by marking

Queries are represented in JPA  by the Query and TypedQuery interfaces: The JPA Query API ... that is known only at runtime (e.g. depending on which fields are filled by a user in a form) can be done by concatenating JPQL strings into a valid complete JPQL query. JPA 2 introduced the JPA Criteria

The JPA Criteria API interfaces in this group are used for setting the SELECT and ORDER BY clauses ... clause in a criteria query is represented by Selection : Because Selection  is a super interface ... selection expressions can be represented by   CompoundSelection , which is itself a subinterface