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Manual
18

JPA Persistable Types

The term persistable types refers to data types that can be used in storing data in the database ... can be stored in the database directly. Other persistable types can be embedded in entity classes as fields. In ... persistent fields would cause data duplication in the database. Entity Classes An entity class
Manual
17

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
Tutorial
17

Step 3: Add a Main Class

the database and then retrieve them from the database: Open the [New Java Class] dialog box by right ... class Main { public static void main(String[] args) { // Open a database connection // (create a new database if it doesn't exist yet): EntityManagerFactory emf
Tutorial
17

Step 3: Add a Main Class

to store Point objects in the database and then retrieve them from the database. Use copy and paste ... ) { // Open a database connection // (create a new database if it doesn't exist ... Point objects in the database: em.getTransaction().begin(); for (int i = 0; i
Forum
16

Best practice: Database update/migration of embedded databases in products

is now held otherwise. The product store user data in the ObjectDB-Database. Example: V1.0: EntityPerson ... city;}     DB3: [name=”Max Mustermann”; zip=”26135”; city=”Oldenburg”] How can we load the Database ... the database in their new form, you can remove the fields firstName and familyName from V2.0.   btc_es
Manual
16

DELETE Queries in JPA/JPQL

As explained in chapter 2, entity objects can be deleted from the database by: Retrieving ... . Applying changes to the database by calling the commit method. JPQL DELETE queries provide ... the database, DELETE queries do not retrieve data from the database, but when executed, delete specified
Manual
16

FROM clause (JPQL / Criteria API)

the database. A query identification variable is similar to a variable of a Java enhanced for loop in ... 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
Manual
16

JPA Entity Fields

that do not participate in persistence and their values are never stored in the database (similar ... only transient (non persistent) entity fields with no real content to be stored in the database. Persistent ... otherwise (e.g. by using the @Transient annotation). Storing an entity object in the database does not
Manual
14

Online Backup

An ObjectDB database can be backed up by simply copying or archiving the database file while the database is offline (i.e. when it is not open in an ObjectDB server and not in use by any application), since an ObjectDB database is stored as an ordinary file in the file system.  ObjectDB 2.1
Manual
14

Server User List

definitions but the master user itself cannot be used to connect to the database. The element ... . The required permissions attribute specifies which database file permissions are granted. The comma separated string value may contain the following permissions: access - permission to open a database