About Object Database

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Manual
20

UPDATE SET Queries in JPA/JPQL

the content of specified entity objects in the database. Updating entity objects in the database using ... with the database. For example, the EntityManager may not be aware that a cached entity object in ... Existing entity objects can be updated, as explained in chapter 2, by: Retrieving the entity
Manual
19

GROUP BY and HAVING clauses

clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects ... over all the Country objects in the database. The GROUP BY clause groups these Country objects by ... properties of generated groups instead of individual objects and fields. The position of a GROUP BY
Manual
19

JPA Query Structure (JPQL / Criteria)

rather than just field values from database tables, as with SQL. That makes JPQL more object oriented friendly ... JPQL Query The following query retrieves all the Country objects in the database: SELECT c FROM ... over objects in the database. A query variable that is bound to an entity class is referred to as
Manual
18

JPA Lifecycle Events

(added to the EntityManager). @PostPersist - after storing a new entity in the database (during commit or flush). @PostLoad - after an entity has been retrieved from the database. @PreUpdate ... the database (during commit or flush). @PreRemove - when an entity is marked for removal in
Issue
16

Explorer bug ? Objects seem to be missing from database in Class view, but are present as references

) We see that 2 Project objects were created, however in the database Explorer it lists size=0 for Project class ... because it appears to be either database integrity corruption, or it just looks like ... . When the project runs it logs creation of objects. Please note that there are 2 Project objects, and note
Forum
16

how to operate with same object but two different Thread on database.

operation with that same object and same database. --------- So, point is two different operation, two different thread,one object(we can assume one table in sql), one database. if it will possible ... with its own EntityManager has a private persistence context, i.e. the same database object
Forum
16

Is ObjectDB the only object database that supports JPA?

Other Object database doesn't support JPA?   JPA is designed as an API for Object Relational Mapping (ORM), so many JPA features cannot be supported by regular object databases. For example, user ... ), which are not supported by most object databases. ObjectDB does support these features.  Some object
Forum
16

How to define database structure and insert some initial objects from scratch

the initial database structure of our application? We know objectdb is all about objects and probably doesn't ... .createEntityManager();         // Store 1000 Point objects in the database:         em.getTransaction().begin ... jdbc driver for ETL software like Kettle? How about migrating data from another database
Issue
16

Object DB Explorer fails to open database

. The code runs fine. i.e. Role objects are getting persisted in the database. But when I try to open the database using Object DB Explorer, it fails.  I have attached all the related files.  Regards, Md ... with it. Again the code runs fine but Object DB Explorer fails to open the database.  All the related
Forum
16

How to access database object to my application.

is without using tostring method. like a independent object and database. Thank you. Unfortunately ... Hi, I want to access a object which contains some value like id,name,college and address. Here it returns some address but i am not getting object value, i attach 3 java program below, please check