6 | What are the main benefits of using ObjectDB? performance. Reducing Development Time and Costs ObjectDB makes database programming easier and faster. The ability to store ordinary objects in the database directly can simplify the code significantly ... fields can be stored by ObjectDB simply as part of the containing object. Relational databases lack |
6 | Paths and Types in JPQL and Criteria API over all the Country objects in the database. For a country with no capital city, such as Nauru, c.capital ... of all the entity objects in the database, excluding Country entity objects: SELECT COUNT(e) FROM ... is an extension of ObjectDB that can be used to iterate over all the entity objects in the database |
6 | 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 |
6 | CompanyObjectDB Software develops, markets and supports the ObjectDB Object-Oriented Database Management ... ) standards, since ObjectDB is the first object oriented database with built in support of JPA and JDO ... . When database performance matters - ObjectDB Software provides the most effective solution. ObjectDB Software |
5 | SELECT clause (JPQL / Criteria API) that JPA provides for managed entity objects, including transparent navigation to other database ... propagated to the database. Multiple SELECT Expressions The SELECT clause may also define composite |
1 | Step 4: Run the Application) When you run the application for the first time, a new ObjectDB database file is generated in ... will use the existing database file to store an additional 1000 objects. You can view the content of the database file by opening it in the ObjectDB Explorer: This is the end of the Eclipse JPA tutorial |
1 | Step 4: Add a Servlet Class Guest entity object is constructed and stored in the database. All the Guest entity objects are retrieved from the database and stored in the request's "guest" attribute. Then the processing ... " attribute to generate the page output. Notice that operations on the database are carried on by the GuestDao |
1 | Step 2: Define a JPA Entity ClassTo store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... in the database. Besides the @Entity annotation and the id field (and its annotations) - the Guest ... is adding a context listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database. |
1 | Step 4: Add a Servlet Class that will be added in the next tutorial step) - a new Guest entity object is constructed and stored in the database. All the Guest entity objects are retrieved from the database and stored in the request's "guest ... on the database are carried on by the GuestDao session bean, which is instantiated and injected by |
0 | javax.jdo.JDOEntityManager to the database will not be persisted. Since: JPA 1.0 boolean contains(Object entity) Check ... of the entity), will not be synchronized to the database. Entities which previously referenced the detached ... provider must perform optimistic version checks when obtaining the database lock. If these checks fail |
