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Manual
14

Query Parameters in JPA

) The following method retrieves a Country object from the database by its name: public Country ... ( "SELECT c FROM Country c WHERE c.name = :name", Country.class); return query.setParameter ... .createQuery( "SELECT c FROM Country c WHERE c.name = ?1", Country.class); return query
JDO Doc
14

javax.jdo.PersistenceManager

to manage the life cycle of PersistenceCapable instances. A PersistenceManager is obtained from ... 1.0 void deletePersistent(Object pc) Delete the persistent instance from the data store. Delete the persistent instance from the data store. This method must be called in an active transaction
Result
13

Privacy Policy

for websites to obtain explicit consent from users before leaving behind or reading files such as cookies ... . Users are advised that if they wish to deny the use and saving of cookies from this website ... settings to block all cookies from this website and its external serving vendors. This website uses
Manual
13

Running JPA Queries

: TypedQuery query = em.createQuery("SELECT c FROM Country c", Country.class); List ... (generic) type: Query query = em.createQuery("SELECT c FROM Country c"); List results = query ... has to be extracted from the result collection after query execution (e.g. by results.get(0)). To eliminate
Manual
13

Updating JPA Entity Objects

Once an entity object is retrieved from the database (no matter which way) it can simply be modified in memory from inside an active transaction: Employee employee = em.find(Employee.class, 1); em ... can be cascaded from all the entity objects that have to be stored in the database, including from
Manual
13

Deleting JPA Entity Objects

Existing entity objects can be deleted from the database either explicitly by invoking the remove ... from the database it has to first be retrieved (no matter which way) and then in an active ... (); The entity object is physically deleted from the database when the transaction is committed. Embedded
Result
12

Eclipse Public License - v 1.0

additions to the Program originate from and are distributed by that particular Contributor. A Contribution 'originates' from a Contributor if it was added to the Program by such Contributor itself or ... , such as lost profits; iii) states that any provisions which differ from this Agreement are offered
Manual
12

JPA Primary Key

that is absent from other object oriented databases. Entity Identification Every entity object in the database is uniquely identified (and can be retrieved from the database) by the combination of its type ... are deleted from the database. The primary key value of an entity can be accessed by declaring a primary
Manual
12

Shared (L2) Entity Cache

an entity object that is already managed by the EntityManager returns the existing instance from ... - every entity class which is not marked with @Cacheable inherits cacheability setting from its super ... context. If an entity object is not available also in the shared cache - it is retrieved from
Tutorial
12

Step 3: Add a Main Class

In this step we will add a main class to the project to store and retrieve Point objects from ... the database: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point p ... : Query q2 = em.createQuery("SELECT AVG(p.x) FROM Point p"); System.out.println("Average X