ObjectDB Database Search

== 0)) ORDER BY r.startDateTime DESC If we remove the ORDER BY part, the query completes OK ... : Caused by : java.lang.IllegalStateException: com.objectdb.o.InternalException: Unexpected internal ... ;           Caused by : com.objectdb.o.InternalException

Hi, after trying out objectdb for a while now and being quite impressed by its speed and overall performance I noticed a strange behaviour where an ORDER BY - directive isn't executed as ... if we order by a simple member (e.g. a String) being the Entity-ID and, at the same time, filter

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

Dear all, I have a problem with ORDER BY clause. I have a simple query: select u from User u order by u.name When the name starts with "normal/english" character, records are ordered correctly ... ORDER BY clause. However, if you have to sort a large result list - it might be more efficient

and using. We find a slow memleak in our application recently, and by trace of Entity construct and finalize, we found the problem is caused by bad state of EntityManager. After first throwing ... and retrieved by EntityManagerFactory, and the instances of Entity constructed by ObjectDB

, of type ECompoundKeyMapItem, identified by their "key" within the EContainer class. The items ... "ECompoundKeyMapSubItem", identified by their keys. The embeddedId for the item class, ECompoundKeyMapItemId ... ] Unexpected exception (Error 990) Generated by Java HotSpot(TM) Client VM 1.6.0_27 (on Windows Server 2008 6.0

attribute specifies how non-enhanced classes are handled. ObjectDB can manage non-enhanced classes by ... . The valid values are "weak" , "soft" , and "strong" . Modified entities are always held by strong ... attribute specifies the size of the shared level-2 cache that is managed by

This chapter demonstrates basic ObjectDB and JPA concepts by introducing a simple example program ... is represented by an object with two int fields, x and y , that store the point's x and y coordinates. The program demonstrates CRUD database operations by storing, retrieving, updating, and deleting

manage broad persistence issues by using the base class. The exception hierarchy is as follows ... and locking exceptions Lock acquisition failures during updates or retrieval are indicated by : Thrown ... : Thrown by Query.getSingleResult() when the query returns no results. Thrown by Query.getSingleResult

the example, SSL is disabled by default. Enable SSL when accessing remote ObjectDB databases ... by using the JDK keytool utility: https://docs.oracle.com/javase/6/docs/technotes/tools/solaris/keytool.html By using these keystore and truststore files, a client can verify during the SSL handshake

Jakarta Persistence (JPA) Annotation Type jakarta.persistence.NamedEntityGraphs Implemented Interfaces: Annotation Target: Type Used to group NamedEntityGraph annotations. See Also: NamedEntityGraph Since: Jakarta Persistence (JPA) 2.1 Annotation Elements NamedEntityGraph[] value Since: Jakarta

Jakarta Persistence (JPA) Annotation Type jakarta.persistence.Converts Implemented Interfaces: Annotation Target: Method, Field, Type Used to group Convert annotations. Multiple converters must not be applied to the same basic attribute. See Also: Convert Since: Jakarta Persistence (JPA) 2.1

Jakarta Persistence (JPA) Annotation Type jakarta.persistence.SequenceGenerators Implemented Interfaces: Annotation Target: Type, Method, Field, Package Used to group SequenceGenerator annotations. See Also: SequenceGenerator Since: Jakarta Persistence (JPA) 2.2 Annotation Elements

Jakarta Persistence (JPA) Annotation Type jakarta.persistence.TableGenerators Implemented Interfaces: Annotation Target: Type, Method, Field, Package Used to group TableGenerator annotations. See Also: TableGenerator Since: Jakarta Persistence (JPA) 2.2 Annotation Elements TableGenerator[] value

of the Java Data Objects (JDO) API than competing object databases. By using a standard API such as JPA ... relational database by using an ORM JPA provider such as Hibernate, EclipseLink or Open JPA ... . The support of two standard APIs (JPA and JDO) by ObjectDB minimizes the risk

A composite index is an index on more than one persistent field. Define a composite index by specifying ... is sorted lexicographically by word, not by word length. In summary, if an index contains all the fields in

) is that in JPA data is represented by classes and objects rather than by tables and records as in ... of the Java Persistence API (JPA). By interacting with ObjectDB using standard JPA

, which retrieves all Country objects from the database, is represented by both q1 and q2 . When you build ... JPA, building queries by passing JPQL query strings directly to the createQuery method is called ... named queries , by using the @NamedQuery and @NamedQueries annotations. In JPA, it is a best

of a parameterized type by using an enhanced for loop: for (Country c : results) { System.out.println(c.getName ... result object. However, you must then extract the object from the result collection, for example, by ... )query. getSingleResult (); By definition, an aggregate COUNT query always returns one result. In

a specific type by its Class instance: // Get a managed type (entity, embeddable or mapped super classes ... . Type interface hierarchy In the Metamodel API, types are represented by interfaces that extend the Type ... interface hierarchy Managed fields and properties are represented by the Attribute interface

Hello, we opened a transaction, load an entity from database and removed this entity by em.remove(). Afterwards the entity can be load again by query although the resulted entity have an attribute ... them available to that transaction. Every snapshot represents a picture of the database as seen by

We start by creating a new Eclipse Dynamic Web Project: Open the [New Project] dialog box, e.g. by ... as a new server by clicking the New Runtime... button . Follow the instructions and specify the path ... web project. Now, add ObjectDB support to the new Eclipse Project - by dragging the objectdb

The Guest entities will be stored in an ObjectDB database, which will be represented by a JPA's ... if not existing yet) when the web application starts, by instantiating an EntityManagerFactory . The database will be closed when the web application stops (or when the web server shuts down), by

] dialog box by right clicking the WEB-INF node under the Web Pages node (in the [Projects] window ... , which contains a simple form for signing the guestbook, followed by a list of all the guests that have already signed (which are retrieved from the request's guestDao attribute that is set by

the [New Java Class] dialog box, e.g. by right clicking the project node (in the [Package Explorer] window ... + ")"; } } The Guest entity class will represents guests in the database. We also need to configure JPA by setting a META-INF/persistence.xml file: Open the [New Folder] dialog box, e.g. by right clicking the project

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 and all the  Guest entities

You can run the application now by right clicking the Main node (in the [Projects] window ... 1,000 objects. You can view the content of the database file by opening it in the ObjectDB Explorer : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

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

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 and all the Guest

We start by creating a new Java EE dynamic web project in Eclipse: Open the [New Project] dialog box, e.g. by using File New Project... Select Web Dynamic Web Project and click Next . Choose ... runtime. Note: You may have to add GlassFish 3 as a new server by clicking the New Runtime... button

the [New Entity Class] dialog box, e.g. by right clicking the project node (in the [Projects] window ... to the project (under Configuration Files). Open the persistence.xml file in a text editor ( by right clicking and selecting Edit or by double click and then moving to the Source or XML tab in

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 and all the  Guest entities are stored in an ObjectDB database

] dialog box by right clicking the Web Pages node (in the [Projects] window) and selecting New JSP ... a simple form for signing the guestbook, followed by a list of all the guests that have already signed (which are retrieved from the request's "guests" attribute that is set by the servlet in

You can now run the application by right clicking the Main.java file (in the [ Package Explorer ] window) and selecting Run As Java Application . The expected output in the Eclipse [Console] window ... by opening it in the ObjectDB Explorer : This is the end of the Eclipse JPA tutorial. Learn more about ObjectDB and JPA by reading the Manual .

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 and all the Guest entities

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 and all the Guest entities are stored in an ObjectDB database. Required Software

. 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

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

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 and all the  Guest entities are stored in an ObjectDB database

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New Entity Class] dialog box, e.g. by right clicking the project node (in the [Projects] window ... a text editor ( by right clicking and selecting Edit or by double click and then moving to the XML

. 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 and all the Guest entities are stored in an ObjectDB database

] dialog box by right clicking the Web Pages node (in the [Projects] window) and selecting New JSP ... a simple form for signing the guestbook, followed by a list of all the guests that have already signed (which are retrieved from the request's "guests" attribute that is set by the servlet in

] dialog box by right clicking the WebContent node (in the [Package Explorer] window), selecting ... the guestbook, followed by a list of all the guests that have already signed (which are retrieved from the request's "guests" attribute that is set by the servlet in the previous step). The next step

] dialog box by right clicking WEB-INF under src/main/webapp (in the [Package Explorer] window ... the guestbook, followed by a list of all the guests that have already signed (which are retrieved from the request's  guestDao attribute that is set by the controller in the previous step

box by right clicking the guest package node (in the [Projects] window) and selecting New Servlet ... the page output. Notice that operations on the database are carried on by the  GuestDao session bean, which is instantiated and injected by the application server into the  guestDao field

] dialog box by right clicking the WebContent node (in the [Package Explorer] window), selecting ... generates the guestbook page output, which contains a simple form for signing the guestbook, followed by ... " attribute that is set by the servlet in the previous step). The next step (and the last one in this tutorial) is running the web application .

In this step we will add a servlet to manage guestbook web requests: Open the [Create Servlet] dialog box by right clicking the guest package node (in the [Package Explorer] window), selecting  ... on the database are carried on by the GuestDao session bean, which is instantiated and injected by the application

the [New Data Set] dialog box by right clicking the Data Sets node in the [Data Explorer] window ... Points ).  Enter a data set name (e.g. Points by X ) and click Next . The database in ... ( 20 ): You may click Preview Results  to see the query results: Close the dialog box by clicking

We start by creating a new NetBeans Web Application Project: Open the [New Project] dialog box, e.g. by using File New Project... Select Java Web Web Application and click Next . Choose a Project ... : You may have to add Tomcat 6 as a new server by clicking the Add... button . Follow the instructions and specify

technology by Sun Microsystems. The main purpose of this guide is to familiarise you with ObjectDB ... class is and which types are supported by JDO. Chapter 4 - JDO Metadata Shows how to define JDO ... you may want to extend your knowledge of JDO by reading the JDO specification or a book on JDO