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34

General Performance Issues Illustrated with a Specific Method

" + ") " + " from Client c " + " where c.retired=false ... ) from Client c where c.retired=false and ( lower(c.phn)=:q or lower(c.person.localReferanceNo ... =false and ( lower(c.phn)=:q or lower(c.person.localReferanceNo)=:q or lower(c.person.ssNumber
8

FROM clause (JPQL / Criteria API)

,DELETE, DESC, DISTINCT, ELSE, EMPTY, END, ENTRY, ESCAPE, EXISTS, FALSE, FETCH,FROM, GROUP, HAVING, IN
8

Index Definition

with no unique constraint or a unique index if unique="true"is specified (the default is false). The optional
8

Shared (L2) Entity Cache

that are specified as non Cacheable explicitly. For example: @Cacheable(false) @Entity public class
8

Server User List

to 192.18.194.255, as well as from 127.0.0.1. The admin attribute (whose value is "true" or "false
6

javax.persistence.criteria.CriteriaBuilder

with zero disjuncts is false. Returns: or predicate Since: JPA 2.0 Predicate equal( Expression<?> x ... a predicate testing for a false value. Create a predicate testing for a false value. Parameters: x ... will be false. Parameters: elem - element collection - expression Returns: is-member predicate
0

javax.jdo.PersistenceManager

, then it throws a JDOUserException. If the validate flag is false, and there is already an instance ... , where multiple PersistenceCapable classes share the same ObjectId class. If the validate flag is false ... is false, this method behaves exactly as makeTransient(Object pc). The affected instance(s) lose their JDO
0

[ODB1] Chapter 3 - Persistent Classes

. New persistent fields that are missing in the old schema are initialized with default values (0, false
0

javax.jdo.spi.StateInterrogation

.TRUE. Instances known by the implementation to be non-deleted return Boolean.FALSE. Instances not ... -detached return Boolean.FALSE. Instances not recognized by the implementation return null. Parameters: pc ... return Boolean.FALSE. Instances not recognized by the implementation return null. Parameters: pc
0

javax.jdo.JDOHelper

return false. Parameters: pc - the PersistenceCapable instance. Returns: true if the parameter instance ... that have been detached return true. Transient instances return false. Parameters: pc - the instance ... PersistenceCapable return false. Parameters: pc - the PersistenceCapable instance. Returns: true

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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