6 | ObjectDB OverviewThe ObjectDB Object Database ObjectDB is a powerful Object-Oriented Database Management System (ODBMS). It is compact, reliable, easy to use and extremely fast. ObjectDB provides all the standard database management services (storage and retrieval, transactions, lock management, query processing |
6 | Retrieving JPA Entity ObjectsThe Java Persistence API (JPA) provides various ways to retrieve objects from the database. The retrieval of objects does not require an active transaction because it does not change the content of the database. The persistence context serves as a cache of retrieved entity objects. If a requested |
6 | Database Management Settings of the database file, with $ added at the end. Every transaction commit is first written to the recovery file |
6 | Setting and Tuning of JPA Queries em can be visible to anyone who uses em, even before committing the transaction (but not to users |
6 | JPA Entity Fields (when stored in the database for the first time) is 1. For every transaction in which an entity object |
1 | Step 4: Add a Servlet Class" attribute to generate the page output. Finally, the database connection (including the transaction |
1 | Step 2: Entity Class and Persistence Unit.com/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction |
1 | Step 1: Create a Maven Web Project> <dependency> <groupId>javax.transaction</groupId> <artifactId>jta</artifactId |
1 | Step 4: Add a Servlet Class, the database connection (including the transaction if still active) is closed. The next step is adding a JSP page that will produce the guestbook page output. |
1 | Step 2: Entity Class and Persistence Unit/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction-type="JTA"> <provider>com |
