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JDO Doc
12

javax.jdo.PersistenceManager

the PersistenceManagerFactory (recommended) or by construction. Since: JDO 1.0   void ... JDOUserException if the instance is transient or is managed by another PersistenceManager. Parameters: pc ... the affected instances is as specified by the FetchPlan. Parameters: pc - the instance to detach Returns
Manual
12

JPA Query Expressions (JPQL / Criteria)

consists of clauses - SELECT, FROM, WHERE, GROUP BY, HAVING and ORDER BY, and each clause consists ... of at least one atomic component. More complex query expressions are built by combining atomic ... the following operators (in order of decreasing precedence): Navigation operator (.) Arithmetic operators
Manual
12

Obtaining a JPA Database Connection

In JPA a database connection is represented by the EntityManager interface. Therefore, in order ... to get an EntityManager instance. JPA requires the definition of a persistence unit in an XML file in order ... string that ends with .odb or .objectdb is considered by ObjectDB to be a database url
Forum
12

Update is ignored by ObjectDB

Hi! Sorry for my bad english skills. When I execute fulfilOrder, only Order entity is updated in ... ; @PersistenceContext(unitName = "SMShop") private EntityManager shopdb; ... public Order fulfilOrder(Long orderID, Long userID, int itemID) { Order order = shopdb.find(Order.class, orderID); if (order
Manual
12

Setting and Tuning of JPA Queries

order to be visible to the query. Flush policy in JPA is represented by the FlushModeType enum ... since the setter methods in Query and TypedQuery support method chaining (by returning the query object ... ObjectDB the default is COMMIT (which is more efficient). The default mode can be changed by
Forum
11

Pre-detach loading: retrieval by navigation not working in if statement

/questions/35359676/java-jpa-objectdb-pre-detach-loading-why-retrieval-by-navigation-and-access ... system a BooleanValue wrapper is ultimately an Element that can be referenced by ID, and meets ... boolean value is not the whole story.   By JVM optimizations I meant JIT Compiler optimizations and not
Manual
11

Database Doctor

of a corrupted ObjectDB database file Repairs a corrupted ObjectDB database file by creating a new ... - if recovery file is disabled. Using the database file simultaneously by two instances of the ObjectDB ... the database file externally not through ObjectDB (e.g. by malicious software such as a computer
Tutorial
11

Step 3: Define a Spring DAO Component

= em.createQuery( "SELECT g FROM Guest g ORDER BY g.id", Guest.class); return ... Operations on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC component: Open the [New Java Class] dialog box by right
Tutorial
11

Step 3: Define a Spring DAO Component

( "SELECT g FROM Guest g ORDER BY g.id", Guest.class); return query ... Operations on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC component: Open the [New Java Class] dialog box by right
Forum
11

Should derived fields of an EmbeddedId be manually maintained by app code?

, 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