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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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JPA Query Expressions (JPQL / Criteria)

, navigation and types (get, type). Arithmetic expressions (sum, diff, prod, quot, mod, abs, neg
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javax.persistence.metamodel.Metamodel

the metamodel embeddable type representing the embeddable class. Return the metamodel embeddable type representing the embeddable class. Parameters: cls - the type of the represented embeddable class Returns: the metamodel embeddable type Throws: IllegalArgumentException - if not an embeddable class
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javax.persistence.criteria.Path

Represents a simple or compound attribute path from a bound type or collection, and is a "primitive ... > type) Perform a typecast upon the expression, returning a new expression object. Perform a typecast upon the expression, returning a new expression object. This method does not cause type conversion
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javax.persistence.criteria.Fetch

join to the specified attribute using the given join type. Create a fetch join to the specified attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting fetch join Throws: IllegalArgumentException
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javax.jdo.FetchGroup

with addCategory and removeCategory calls. This category includes all members in the persistent type ... types as defined in section 6.4 of the specification, including String, Locale, Currency, BigDecimal, and BigInteger; as well as Date and its jdbc subtypes and Enum types. Since: JDO 2.2 String DEFAULT
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javax.persistence.EnumType

> Defines mapping for enumerated types. The constants of this enumerated type specify how a persistent property or field of an enumerated type should be persisted. Since: JPA 1.0 Learn how to define and use enum fields in Chapter 2 of the ObjectDB/JPA manual. EnumType ORDINAL Persist enumerated type
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javax.persistence.criteria.ParameterExpression

>, Parameter, Selection, TupleElement Type of criteria query parameter expressions. Since: JPA 2.0 ... . Parameters: name - alias Returns: selection item Since: JPA 2.0 Expression as(Class type ... upon the expression, returning a new expression object. This method does not cause type conversion
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javax.persistence.DiscriminatorType

, Comparable Defines supported types of the discriminator column. Since: JPA 1.0 DiscriminatorType CHAR Single character as the discriminator type. Single character as the discriminator type. Since: JPA 1.0 DiscriminatorType INTEGER Integer as the discriminator type. Integer as
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javax.persistence.metamodel.Bindable.BindableType

_TYPE Entity type Entity type Since: JPA 2.0 BindableType PLURAL_ATTRIBUTE Multi-valued attribute type Multi-valued attribute type Since: JPA 2.0 BindableType SINGULAR_ATTRIBUTE Single-valued attribute type Single-valued attribute type Since: JPA 2.0 BindableType valueOf(String name) Returns the enum

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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