299 | 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 |
124 | Left join fetch behaviour doesn't retrieve children?(); em.clear(); em.close(); // Try to retrieve parent and children using ... is now closed, let's check if children are retrieved em.close(); emf.close ... (); em.close(); // Try to retrieve parent and children using left join fetch em = emf |
29 | CRUD Operations with JPAExplains how to use JPA for CRUD database operations (persist, retrieve, update, remove). |
29 | Chapter 3 - Using JPAExplains how to store, retrieve, update and delete entity objects using JPA. |
25 | CRUD Database Operations with JPA it to store, retrieve, update and delete database objects. Storing New Entity Objects The following ... a Double object reflecting the average x value of all the Point objects in the database. Retrieving Existing Entities The Retrieving Entities section in chapter 3 describes several methods for retrieving |
25 | Shared (L2) Entity Cache that it manages. The persistence context serves as a first level cache. An attempt to retrieve ... automatically: On retrieval - shared cache is used for entity objects that are not in the persistence context. If an entity object is not available also in the shared cache - it is retrieved from |
7 | retrieve(pc, useFetchPlan)Method javax.jdo.PersistenceManager void retrieve( Object pc, boolean useFetchPlan ) Retrieve field ... intends to use the instance, and its field values must be retrieved. If the useFetchPlan parameter ... the current fetch plan to determine which fields to load and which instances to retrieve. Since: JDO 2.0 |
7 | retrieve(pc)Method javax.jdo.PersistenceManager void retrieve( Object pc ) Retrieve field values of an instance ... , and its field values must be retrieved. The PersistenceManager might use policy information about the class to retrieve associated instances. Parameters: pc - the instance Since: JDO 1.0 |
5 | [ODB1] Chapter 6 - Persistent Objects or queried directly (an embedded object can only be retrieved using a reference from its containing ... in object retrieval, as shown in the next section (section 6.3). ObjectDB supports two identifying ... can easily start from them, as explained in the next section. 6.3 Retrieving Persistent Objects |
3 | [ODB1] Chapter 7 - JDOQL QueriesThere are various ways to retrieve objects from an ObjectDB database, as shown in section 6.3. An Extent, for instance, can be used to retrieve all the instances of a specified persistent class. When a more selective retrieval is needed, JDOQL (JDO Query Language) is used. JDOQL for JDO is like SQL |
