5 | javax.persistence.EntityManager that are related or grouped by the application, and which must be colocated in their mapping to a single ... for executing a named query (in the Java Persistence query language or in native SQL). Create an instance of Query for executing a named query (in the Java Persistence query language or in native SQL |
5 | Detached Entity Objects object. Cascading Detach Marking a reference field with CascadeType.DETACH (or CascadeType ... invocation of rollback or by a commit failure. Explicit Merge Detached objects can be attached ... class or it is a removed entity. A TransactionRequiredException is thrown if there is no active |
5 | Deleting JPA Entity Objects method or implicitly as a result of a cascade operation. Explicit Remove In order to delete an object ... if the argument is not an instance of an entity class or if it is a detached entity ... with CascadeType.REMOVE (or CascadeType.ALL, which includes REMOVE) indicates that remove operations |
5 | ObjectDB Object Database Features Requirements Windows, Linux, Unix, Mac OS, and most other OS with Java support. Java 8 or higher Tested ... a proprietary API - any user with some experience with Hibernate, TopLink, EclipseLink, OpenJPA, JPOX or ... - multiple @Id fields or a @EmbeddedId field. Primary Key Data Types Primitives (boolean, byte, short |
5 | Posting Sample CodeTo demonstrate a technical question or an issue - you may have to provide a complete runnable sample program. If an unexpected exception (e.g. NullPointerException or ClassCastException) is thrown by ... should have a no-arg public or protected constructor, An entity class must be a top level class, The project does |
5 | Auto Generated Values and using the named sequence in one or more fields in one or more classes. The @SequenceGenerator ... one or more fields in one or more classes. The SEQUENCE strategy is used in the @GeneratedValue |
5 | Query Parameters in JPA other query elements) are represented by objects (of type ParameterExpression or its super interface Parameter) rather than by names or numbers. See the Parameters in Criteria Queries section ... methods in order to specify what they represent, such as a pure date, a pure time or a combination |
1 | Eclipse/JPA Java EE Tutorial For this tutorial you will need the following software: Java JDK (6.0 or above). Eclipse IDE for Java EE Developers. GlassFish Server 3.0.1 (or above). The last version of ObjectDB (just download and extract ... : ObjectDB 2.3.7_04 or later is required if Glassfish 3.1.2 (or later) is used. The Tutorial Steps This tutorial consists of the following steps: |
1 | NetBeans/JPA Java EE Tutorial For this tutorial you will need the following software: Java JDK (6.0 or above). NetBeans - Java or ... slightly different but the code would be the same). Note: ObjectDB 2.3.7_04 or later is required if Glassfish 3.1.2 (or later) is used. The Tutorial Steps This tutorial consists of the following steps: |
0 | ObjectDB 1.0 Manual (SQL, JDBC or JDO) is not required in order to follow this guide, but a strong background ... you may want to extend your knowledge of JDO by reading the JDO specification or a book on JDO. Feedback We would appreciate any comment or suggestion regarding this manual. Please send your comments or questions to support@objectdb.com. |
