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Collections in JPQL and Criteria Queries

. as path expressions - in navigation to persistent collection fields. IS [NOT] EMPTY The IS [NOT] EMPTY operator checks whether a specified collection is empty or not. For example: c.languages IS EMPTY is TRUE if the collection is empty and FALSE otherwise. c.languages IS NOT EMPTY is FALSE

Comparison in JPQL and Criteria API

Equal To >= >= Equal = == Not Equal <> != The two sets differ in the Equal and the Not Equal operators ... . When both operands are not NULL (not shown in the table) the operator is evaluated to either TRUE or FALSE ... and expressions that include an unknown value are evaluated as unknown, i.e. to NULL. IS [NOT] NULL

Eclipse Public License - v 1.0

anyone acting on such Contributor's behalf. Contributions do not include additions to the Program ... under their own license agreement, and (ii) are not derivative works of the Program. "Contributor" means any person or ... to be covered by the Licensed Patents. The patent license shall not apply to any other combinations

Apache License, Version 2.0, January 2004

. "Source" form shall mean the preferred form for making modifications, including but not limited ... resulting from mechanical transformation or translation of a Source form, including but not limited ... . For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely

Detached Entity Objects

Detached entity objects are objects in a special state in which they are not managed by any ... objects are limited in functionality: Many JPA methods do not accept detached objects (e.g. lock). Retrieval by navigation from detached objects is not supported, so only persistent fields

FROM clause (JPQL / Criteria API)

are always polymorphic. JPQL does not provide a way to exclude descendant classes from iteration ... pair of countries that do not share a border, returning as results only neighboring countries ... a simpler long path expression (which is not an option for a collection). For example: SELECT c, c

ObjectDB License Agreement [ver. 2.0.4]

the software you agree to the terms and conditions of this agreement. If you do not agree to these terms and conditions - do not download, install or use the software. This agreement is between ObjectDB ... of this agreement. 2. The Customer is not allowed to modify the Software or any portion of it in any

JPA Persistable Types

: should be a top-level class (i.e. not a nested / inner class). should have a public or protected ... user defined class (but not system classes, such as ArrayList) and implement any interface ... classes, but also some restrictions. ObjectDB, however, does not enforce these restrictions so mapped

[ODB1] Chapter 9 - ObjectDB Explorer

Some JVM arguments can be useful. For instance, by default Java does not use more than 64MB ... . Otherwise, the required executable jar would not be found by explorer.exe. By default, running explorer.exe ... Explorer. In this way, the edited script will not be deleted when extracting files of a newer

[ODB1] Chapter 2 - A Quick Tour

with the HelloWorld sample program, which is not JDO portable because it uses some ObjectDB extensions ... catch (JDOException x) { 23 // If not found - construct and store a new list ... (lines 12-13). If a database file does not exist in that path, a new database file is created

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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