ObjectDB Database Search

Hi, I'm trying to create reporting query that will return entities grouped by year / mont / day ... WHERE YEAR(record_date) = 2009 GROUP BY YEAR(record_date), MONTH(record_date) or maybe something like this: SELECT COUNT(id) FROM stats WHERE YEAR(record_date) = 2009 GROUP BY DATE_FORMAT(record_date

Well ! I think i pointed out a HUGE performance issue with mapped- by attribute (yeah ... , go the MyEntity class and remove "mapped- by ". You obtain 1 second max of query fetch. So my performance ... = "myEntity") // Test by adding / remove "mappedBy" public MyEntityChild getEntityChild() {  

after an undetermined period. Caused by : com.objectdb.o.UserException: Connection is closed at com ... .createEntityManager(EMF.java:160) ... 39 more Caused by : java.io.EOFException at com.objectdb.o.NTS

the application I get an exception. The exception is ultimately caused by a null pointer on the line "em ... it is, because stack traces are occasionally inaccurate. Try to change your code by moving suspected lines to separate methods, etc. support Support

() is throwing the following exception ava.lang.ArithmeticException: / by zero at com.objectdb.td.remove(td.java ... Binit Bhaskar This division by zero occurs in some hash table that happens to have a 0 size (but I

Hi, I am unable to repair a database by Doctor. Getting following error. com.objectdb.o.UserException: Failed to locate field field com.apps.test.ContactTab.col8 using reflection at com.objectdb.o ... ) at com.objectdb.o.DCM.j(DCM.java:112) at com.objectdb.Doctor.main(Doctor.java:10) Caused by : java

Hello, it is possible to find out if a child entity is just referenced by other parent entity types. But the types of the parent entities are unknown. Is there a possibility to find out if an entity is referenced? best regards btc_es BTC EmbeddedSystems You can only find it (using a query

tn3 = em.find(tNode.class, 1);   System.out.printf("find by retrieval : %s %n",tn3.getTa

MyEntity that wraps the array access operation and then use that method in the query. It is supported by

I'm trying to fetch a list of entities, by their Id. I Use this query: SELECT c FROM User c WHERE c.id IN :ids This querey works as long as I don't set the property "id" as @Id. If i set @Id to any other member, this query works, if I set id as @Id, it stops working and gives zero results

covered by the fix of 2.6.6_05. Build 2.6.6_06 should fix it. Unfortunately it is difficult to cover

of objectC, and I cant find any reason for that. Could be any bug in ObjectDB when I retrieve by navigation

JPQL features are not supported yet by ObjectDB. The main missing feature is subqueries

. I want to search for objects by exact timestamps.   takada Takumi Adachi It should work

Hello! In a query like SELECT parent, children FROM Parent parent LEFT JOIN p.children children GROUP BY parent  maybe it would be good if it will return a list of Object[2], where the second object is a list of children of a parent. Because creating a query to get a list of parents

java.sql.Time field off by 30 minutes

getting "Unexpected total page count" error when diagnosis mu db by ObjectDB doctor.

Can you implement fastest Native JPA for MySQL by ClusterJ like?

.5_05] Unexpected exception (Error 990)   Generated by Java HotSpot(TM) 64-Bit Server VM 1.8.0 ... ) and the next part: Caused by : java.lang.OutOfMemoryError: Metaspace at java.lang.ClassLoader

I have a problem loading lazy associations by access/navigation with an @Embedded attribute containing an @ElementCollection which is lazy loaded.  I'm not sure if the same problem exists ... { ... @ElementCollection // lazy loaded by default private Map values; ... } @Stateless public class

Incorrect entity returned by query

expression handling by using a minimal set of reusable interfaces, so many different types of expressions are represented by the same Expression interface.  Core expressions The following interfaces

The configuration element specifies settings for running an ObjectDB Server . The server is also affected by other elements in the configuration file, such as the and elements. The default ... server. Every database file in the data directory and its subdirectories can be accessed by the server

the original name (specified by the required name attribute) to the new name. All classes in ... , the class name changes from the original name (specified by the required name attribute) to the new name

is global to the application and can be used by multiple fields across different classes. Specify ... Hibernate, TopLink, EclipseLink, and OpenJPA) simulate a sequence by using a table to support

Jakarta Persistence (JPA) Entity Graphs optimize query performance by specifying which attributes should be loaded eagerly. Graph definitions Use the following interfaces to define ... Individual components within a graph are represented by the following interface: Represents a specific

. Only the persistent state of the object, which is represented by its persistent fields , is stored. By default, any

In JPA, a database connection is represented by the EntityManager interface. Therefore, to manipulate an ObjectDB database, you need an EntityManager instance. Operations that modify database ... directory, which by default is the directory where ObjectDB is installed. If a database file does not

to the new schema on a field- by -field basis: For every field in the new schema that has a matching field in ... ) The automatic schema evolution mechanism, as described above, is based on matching fields by

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 ... . An EntityManagerFactory with a lifecycle managed by the application may be created using the static operations

name ) Return the attribute declared by the managed type that corresponds to the specified name ... the attributes declared by the managed type. Returns empty set if the managed type has no declared attributes ... the Collection-valued attribute declared by the managed type that corresponds to the specified name

( String name ) Return the attribute declared by the managed type that corresponds to the specified ... () Return the attributes declared by the managed type. Returns empty set if the managed type has no declared ... elementType ) Return the Collection-valued attribute declared by the managed type that corresponds

( String name ) Return the attribute declared by the managed type that corresponds to the specified name ... the attributes declared by the managed type. Returns empty set if the managed type has no declared ... ) Return the Collection-valued attribute declared by the managed type that corresponds to the specified

) 1.0 Attribute getDeclaredAttribute ( String name ) Return the attribute declared by the managed ... getDeclaredAttributes () Return the attributes declared by the managed type. Returns empty set if the managed type ... the Collection-valued attribute declared by the managed type that corresponds to the specified name

(JPA) 1.0 Attribute getDeclaredAttribute ( String name ) Return the attribute declared by ... (JPA) 1.0 Set getDeclaredAttributes () Return the attributes declared by the managed type. Returns ... getDeclaredCollection ( String name , Class elementType ) Return the Collection-valued attribute declared by

a basic guestbook page. Every visitor can sign the guestbook by filling a simple form. All visitors that have already signed are listed below the form: Persistence is managed by JPA. Every visitor

In this step we will add a Spring Controller to manage guestbook web requests: Open the [New Java Class] dialog box by right clicking the guest package node (in the [Package Explorer] window ... . A GuestDao component is automatically constructed and injected by Spring into the guestDao field

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

We start by creating a new NetBeans Project: Open the [New Project] dialog box, e.g. by using File New Project... Select Java Java Application and click Next . Choose a Project Name (e.g. Tutorial ). The name of the Main class should be tutorial.Main . Verify that exactly this case sensitive fully

another xml configuration file. Open the web.xml file (under Web Pages WEB-INF) in a text editor ( by right clicking and selecting Edit or by double click and then moving to the XML tab in the editor window

We start by creating a new Maven web project in NetBeans: Open the [New Project] dialog box, e.g. by using File New Project... Select Maven Maven Web Application and click Next . Choose a Project Name (e.g. Guestbook ) and select Java EE 5. Enter Maven Group Id (e.g. com.objectdb.tutorial.spring

;you can run the application now by right clicking the project node (in the [Project Explorer] window ... ; ObjectDB Explorer : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the  Manual .

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 

You can run the application now by right clicking the GuestServlet node (in the [Project Explorer] window) and selecting Run As Run on Server Finish : Since we are using ObjectDB in embedded mode ... : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

You can run the application now by right clicking the GuestServlet node (in the [Project Explorer] window) and selecting Run As Run on Server Finish : Since we are using ObjectDB in embedded mode ... the database file in ObjectDB Explorer : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

, enter src/main/java as Folder Name and click Finish . Open the [New Java Class] dialog box, e.g. by ... by setting a  META-INF/persistence.xml file: Right click the src/main/resources node (in

In this step we will add a Spring Controller to manage guestbook web requests: Open the [New Java Class] dialog box by right clicking the guest package node (in the [Projects] window) and selecting ... is automatically constructed and injected by Spring into the guestDao field (because it is annotated

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

You can run the application now by right clicking the  GuestServlet node (in the [Projects] window), selecting  Run File , and then clicking  OK (no need to change the servlet ... server and open the database file in ObjectDB Explorer : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

You can run the application now by right clicking the GuestServlet node (in the [Projects] window), selecting Run File , and then clicking  OK (no need to change the servlet execution URI ... of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .