 15 | In JPA a database connection is represented by the EntityManager interface. Therefore, in order ... to get an EntityManager instance. JPA requires the definition of a persistence unit in an XML file in order ... string that ends with .odb or .objectdb is considered by ObjectDB to be a database url |
14 | order to be visible to the query. Flush policy in JPA is represented by the FlushModeType enum ... since the setter methods in Query and TypedQuery support method chaining (by returning the query object ... ObjectDB the default is COMMIT (which is more efficient). The default mode can be changed by |
14 | of a corrupted ObjectDB database file Repairs a corrupted ObjectDB database file by creating a new ... - if recovery file is disabled. Using the database file simultaneously by two instances of the ObjectDB ... the database file externally not through ObjectDB (e.g. by malicious software such as a computer |
14 | = em.createQuery(
"SELECT g FROM Guest g ORDER BY g.id", Guest.class);
return ... Operations on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC component: Open the [New Java Class] dialog box by right |
14 | (
"SELECT g FROM Guest g ORDER BY g.id", Guest.class);
return query ... Operations on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC component: Open the [New Java Class] dialog box by right |
13 | Existing entity objects can be deleted from the database either explicitly by invoking the remove method or implicitly as a result of a cascade operation. Explicit Remove In order to delete an object ... back and not committed the object is not deleted. An IllegalArgumentException is thrown by remove |
13 | ") specifies if SSL is used. As shown above, SSL is disabled by default. It could be enabled ... . This file is generated from the Keystore file by omitting the private key (it still contains ... of the client machine by the server is also required a Keystore file (which might be different from |
13 | declarations separated by commas. Each ordering declaration is the name of the field on which to order ... with a PersistenceManager. Multiple queries might be executed simultaneously by different threads ... , import statements, ordering and grouping specifications, result and result class, the range |
12 | order to make the reader proficient in a short time. After reading this guide you may want to extend your knowledge of JPA by reading a book on JPA. ... required in order to follow this guide, but a strong background and understanding of the Java |
12 | ) is that in JPA data is represented by classes and objects rather than by tables and records as in JDBC ... programming. A JPA implementation (sometimes referred to as a JPA provider) is needed in order ... Persistence API (JPA). By interacting with ObjectDB using standard JPA you can keep your application |