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3

distinct(distinct)

Method javax.persistence.criteria.Subquery Subquery<T> distinct( boolean distinct ) Specify whether duplicate query results will be eliminated. A true value will cause duplicates to be eliminated ... method. Parameters: distinct - boolean value specifying whether duplicate results must be eliminated
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coalesce()

type of the tuple element Since: JPA 2.0 boolean isCompoundSelection() Whether the selection item is a compound selection. Whether the selection item is a compound selection. Returns: boolean
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isCollection()

Method javax.persistence.metamodel.Attribute boolean isCollection() Is the attribute collection-valued (represents a Collection, Set, List, or Map). Returns: boolean indicating whether the attribute is collection-valued Since: JPA 2.0
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isAssociation()

Method javax.persistence.metamodel.Attribute boolean isAssociation() Is the attribute an association. Returns: boolean indicating whether the attribute corresponds to an association Since: JPA 2.0
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hasVersionAttribute()

Method javax.persistence.metamodel.IdentifiableType boolean hasVersionAttribute() Whether the identifiable type has a version attribute. Returns: boolean indicating whether the identifiable type has a version attribute Since: JPA 2.0
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javax.persistence.criteria.Order

the expression that is used for ordering. Returns: expression used for ordering Since: JPA 2.0 boolean ... : boolean indicating whether ordering is ascending Since: JPA 2.0 Order reverse() Switch the ordering
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javax.persistence.criteria.ParameterExpression

- expressions to be tested against Returns: predicate testing for membership Since: JPA 2.0 boolean ... is a compound selection. Returns: boolean indicating whether the selection is a compound selection
3

contains(entity)

Method javax.persistence.EntityManager boolean contains( Object entity ) Check if the instance is a managed entity instance belonging to the current persistence context. Parameters: entity - entity instance Returns: boolean indicating if entity is in persistence context Throws: IllegalArgumentException - if not an entity Since: JPA 1.0
3

hasSingleIdAttribute()

Method javax.persistence.metamodel.IdentifiableType boolean hasSingleIdAttribute() Whether the identifiable type has a single id attribute. Returns true for a simple id or embedded id; returns false for an idclass. Returns: boolean indicating whether the identifiable type has a single id attribute Since: JPA 2.0
0

javax.jdo.spi.PersistenceCapable.ObjectIdFieldManager

to implement both ObjectIdFieldSupplier and ObjectIdFieldConsumer. Since: JDO 1.0 boolean fetchBooleanField ... storeBooleanField(int fieldNumber, boolean value) Store one field into the field manager. Store

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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