 14 | 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 |
14 | ") 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 |
14 | 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 |
14 | Hello, we opened a transaction, load an entity from database and removed this entity by em.remove(). Afterwards the entity can be load again by query although the resulted entity have an attribute ... : ObjectDB uses snapshots in order to isolate transactions, i.e. to hide uncommitted flush changes |
14 | , of type ECompoundKeyMapItem, identified by their "key" within the EContainer class. The items ... "ECompoundKeyMapSubItem", identified by their keys. The embeddedId for the item class, ECompoundKeyMapItemId ... = parent;
}
[ObjectDB 2.3.0_01] Unexpected exception (Error 990)
Generated by Java HotSpot(TM |
14 | ), count(ov) from ObjectView ov group by hour(ov.created) order by hour(ov.created) ASC where ov ... have to group by date(). For few queries I was concatenating 'date' from year()-month()-day() calls ... implementation. There is only one small problem with new version. When you group by date |
14 | ObjectDB ignores lazy setting of non collection mapped by (inverse) fields and loads them always eagerly. This is allowed by JPA since lazy is only hint but it is not efficient. The reason ... , at least as hollow objects. In order to instantiate referenced objects their exact type is needed |
13 | 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 |
13 | through mapped by to-many relationships. Please check the new build. If you still get the exception we may need a test case that demonstrate the issue in order to explore it further. Thanks, no exception |
13 | ) 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 |