4 | Running JPA Queries("UPDATE Country SET area = 0").executeUpdate(); A TransactionRequiredException is thrown |
4 | Criteria Query Selection and ResultsThe JPA Criteria API interfaces in this group are used for setting the SELECT and ORDER BY clauses and for representing query results as tuples. SELECT Clause Elements The content of the SELECT clause in a criteria query is represented by Selection: Because Selection is a super interface |
4 | Online Backup backup root directory can be specified by setting the target parameter before executing the backup |
4 | JPA Annotations for ClassesJPA defines three types of persistable classes which are set by the following annotations: Chapter 2 of the ObjectDB manual explains these annotations in detail. Entity and mapped super classes can be further configured by annotations that specify cache preferences and lifecycle event listener |
4 | JPA Persistence UnitA JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. persistence.xml Persistence units are defined in |
4 | Criteria Query From ElementsThe interfaces in this group are in use for setting a criteria query FROM clause. Criteria Query Variables The FROM clause in JPA queries (as in SQL) defines the query variables. Query variables are represented in criteria queries by descendant interfaces of the From interface: Range variables |
4 | javax.persistence.criteria.CriteriaQuery do not affect the query. Returns: the list of ordering expressions Since: JPA 2.0 Set ... . Returns empty set if there are no parameters. Modifications to the set do not affect the query. Returns ... type is Object. Returns: result type Since: JPA 2.0 Set<Root<?>> getRoots() Return the query roots |
4 | javax.persistence.EntityManager. An EntityManager instance is associated with a persistence context. A persistence context is a set ... key, and to query over entities. The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit. A persistence unit defines the set of all classes |
0 | Step 5: Add a JSP Page the request's "guests" attribute that is set by the servlet in the previous step). The next step |
0 | [ODB1] Chapter 4 - JDO Metadata above. The Index Rebuilder Tool Setting indexes for a new class that does not have persistent instances |
