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GROUP BY and HAVING clauses

an Expression<Boolean> argument and the other having form takes a variable number of Predicate arguments

Index Definition

a value of one of the following persistable types: Primitive types: boolean, byte, short, char, int

JPA Primary Key

: boolean, byte, short, char, int, long, float, double. Equivalent wrapper classes from package java

Shared (L2) Entity Cache

is cached: boolean isCached = cache.contains(MyEntity.class, Long.valueOf(id)); Cached entity

Working with JPA Entity Objects

is in the persistence context: boolean isManaged = em.contains(employee); The persistence


boolean isAssociation() Is the attribute an association. Is the attribute an association. Returns: boolean indicating whether the attribute corresponds to an association Since: JPA 2.0 boolean isCollection ... collection-valued (represents a Collection, Set, List, or Map). Returns: boolean indicating


. Since: JPA 2.0 AbstractQuery<T> distinct(boolean distinct) Specify whether duplicate query results ... been specified, duplicate results must be retained. Parameters: distinct - boolean value specifying ... <Boolean> restriction) Specify a restriction over the groups of the query. Specify a restriction


instances of PersistenceCapable instances, at the choice of the implementation. Since: JDO 1.0 boolean getBooleanField( PersistenceCapable pc, int field, boolean currentValue) Return the value ... representing the version of the calling instance Since: JDO 2.0 boolean isDeleted( PersistenceCapable pc


to the Class of the query. It is then evaluated by the Boolean expression of the filter. The element ... . Returns: the fetch plan used by this query Since: JDO 2.0 boolean getIgnoreCache ... . Returns: the PersistenceManager associated with this Query. Since: JDO 1.0 boolean isUnmodifiable


See Also: PersistenceManager.getObjectId(Object pc) PersistenceManager.getObjectById(Object oid, boolean validate ... () PersistenceManager.getObjectId(Object pc) PersistenceManager.getObjectById(Object oid, boolean validate) Object ... : the version Since: JDO 2.0 boolean jdoIsDeleted() Tests whether this object has been deleted. Tests

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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