15 | JPA Primary Key. Reference to an entity object. Composite Primary Key A composite primary key consists of multiple ... ; : } When an entity has multiple primary key fields, JPA requires defining a special ID class |
10 | Setting and Tuning of JPA Queries uses automatic optimistic locking to prevent concurrent changes to entity objects by multiple users |
10 | Database Replication and ClusteringObjectDB supports master-slave replication (cluster). When replication (or clustering) is used, the same database is managed on multiple machines (nodes), possibly in different geographic locations. This could help in achieving high availability, fault tolerance and prompt disaster recovery. In |
10 | JPA Query Expressions (JPQL / Criteria): * (multiplication), / (division), + (addition) and - (subtraction). Comparison operators |
10 | Retrieving JPA Entity Objects that field (multiple entity objects can be referenced by a collection field): @Entity class Employee |
10 | JPA Named Queries", query="SELECT c FROM Country c") public class Country { ... } Attaching multiple named |
10 | DELETE Queries in JPA/JPQL multiple variables and JOIN, and cannot include the GROUP BY, HAVING and ORDER BY clauses |
10 | WHERE clause (JPQL / Criteria API))); Multiple Restrictions The second where method takes a variable number of arguments of Predicate type |
10 | CRUD Database Operations with JPA the result objects. It should be used (rather than getSingleResult) when multiple results |
1 | [ODB1] Chapter 4 - JDO Metadata X.jdo must be dedicated to a single class whose name is X. Metadata for multiple classes ... and cannot be shared by references from multiple objects. In addition, embedded objects of persistent classes |
