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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is now held otherwise. The product store user data in the ObjectDB-Database. Example: V1.0: EntityPerson ... : [name=”Max Mustermann”; zip=”26135”; city=”Oldenburg”] How can we load the Database DB1 ... , but not V1.0 -> V2.0 directly, and you make sure that on upgrade all the old objects are converted
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
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
(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
The ObjectDB Object Database ObjectDB is a powerful Object-Oriented Database Management ... Features 100% pure Java Object-Oriented Database Management System (ODBMS). No proprietary API - managed ... and Spring. See the ObjectDB Object Database Features for more details.
since the setter methods in Query and TypedQuery support method chaining (by returning the query object on which they were invoked). Flush Mode (setFlushMode) Changes made to a database using an EntityManager ... . Therefore, before a query is executed, uncommitted database changes (if any) have to be flushed to the database in
.createEntityManager(); // Store 1000 Point objects in the database: em.getTransaction().begin ... of Point objects in the database: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point p ... 1000 Point objects in the database, and then runs a few queries, including a query that retrieves
to the database will not be persisted. Since: JPA 1.0 boolean contains(Object entity) Check ... for each object that failed the consistency check. No datastore resources acquired during the execution ... - a criteria query object Returns: the new query instance Throws: IllegalArgumentException - if the criteria
Static Field javax.jdo.Constants String OPTION_MAPPING_HETEROGENEOUS_OBJECT_TYPE "javax.jdo.option.mapping.HeterogeneousObjectType" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
Welcome to the ObjectDB for Java/JDO Developer's Guide. Here you can learn how to develop database applications using ObjectDB and JDO (Java Data Objects), the revolutionary database programming ... and delete database objects. Chapter 7 - JDOQL Queries Describes JDOQL, the JDO Query Language. The last