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javax.persistence.metamodel.SetAttribute

>>, Bindable<E>, PluralAttribute<X,Set<E>,E> Instances of the type SetAttribute represent persistent java.util.Set-valued attributes. Since: JPA 2.0 Class<T> getBindableJavaType() Return the Java type of the represented object. Return the Java type of the represented object. If the bindable type
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javax.persistence.metamodel.SingularAttribute

>, Bindable<T> Instances of the type SingularAttribute represents persistent single-valued properties or fields. Since: JPA 2.0 Class<T> getBindableJavaType() Return the Java type of the represented object. Return the Java type of the represented object. If the bindable type of the object is PLURAL
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javax.persistence.criteria.Subquery

Returns: selection item Since: JPA 2.0 Expression<X> as(Class<X> type) Perform a typecast ... a new expression object. This method does not cause type conversion: the runtime type is not changed. Warning: may result in a runtime failure. Parameters: type - intended type of the expression Returns
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combined index not used

.properties.doubleValue FROM Action a WHERE a.type = 0 and a.subType = 3 and a.state = 3 and a.endDate ... .linkedObjects.objectNameUpper = 'SETUP' and a.objectsInCharge.linkedObjects.type = 1 ... retaining only results that satisfy: (a.type=0). Step 2: Process ObjectNode (v$1) instances
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JPA Lifecycle Events

of the lifecycle event. The argument can have any type that matches the actual value (e.g. in the code above, Object can be replaced by a more specific type). The listener class should be stateless
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JPA Query Expressions (JPQL / Criteria)

, navigation and types (get, type). Arithmetic expressions (sum, diff, prod, quot, mod, abs, neg
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Auto Generated Values

identity generator is managed per type hierarchy, so generated values are unique only per type
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JPA Reference (JavaDoc)

This reference contains the API documentation (similar to JavaDoc) of the Java Persistence API (JPA) 2.0. The content is derived from the original JPA documentation (in the EclipseLink JPA 2 RI) with some additions and notes. The four most basic JPA types are: All the other JPA types are organized
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javax.jdo.Query

There are two namespaces in queries. Type names have their own namespace that is separate from the namespace for fields, variables and parameters. The method setClass introduces the name of the candidate class in the type namespace. The method declareImports introduces the names of the imported class or interface types
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JDO Predefined ID Classes

but should not be used as the type of a primary key field in a persistence capable class. For example, to use a String primary key define a primary key field of type String: @PersistenceCapable public

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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