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Is ObjectDB the only object database that supports JPA?

Other Object database doesn't support JPA? Manikandan ManikandanPalaniappan JPA is designed as ... (relational databases), which are not supported by most object databases. ObjectDB does support these features. Some object databases support a subset of JPA but as far as we know currently

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

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 ... database object is represented by multiple separate memory objects in different entity managers

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 ... = emf.createEntityManager();         // Store 1000 Point objects in the database:         em ... jdbc driver for ETL software like Kettle? How about migrating data from another database

JPA Primary Key

Every entity object that is stored in the database has a primary key. Once assigned, the primary key cannot be modified. It represents the entity object as long as it exists in the database. As an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not

Locking in JPA

in ObjectDB (and in JPA) is always at the database object level, i.e. each database object is locked separately. Optimistic locking is applied on transaction commit. Any database object ... is being performed on an old version of a database object, for which another update has already been committed

FROM clause (JPQL / Criteria API)

identification variables that iterate over all the database objects of a specific entity class ... over all the Country objects in the database: SELECT c FROM Country AS c The AS keyword is optional ... . Caution is required when using multiple range variables. Iteration over about 1,000,000 database objects

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

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 ... Hello again, I have another case where Object DB Explorer fails to open database. I have a BaseEntity

[ODB1] Chapter 4 - JDO Metadata

in the JDO specification, are ignored by ObjectDB if specified (as a pure object database, ObjectDB always uses datastore identity with its own object-id class). 4.3 Metadata for Fields Unlike ... . When a persistent object is retrieved from the database its fields are not ready yet. Only when the program

[ODB1] Chapter 7 - JDOQL Queries

There are various ways to retrieve objects from an ObjectDB database, as shown in section 6.3 ... for RDBMS. It provides object retrieval from the database according to a specified selectioPlan ... compilation succeeds, the Extent of Person instances in the database is iterated object by object

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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