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The project does not contain a persistence unit

The project does not contain a persistence unit

Index Definition

. When an entity object is stored in the database every indexed field must contain either null or ... . Arrays and collections that contain values of the above types (including null). Indexes ... part of the containing entity. Composite indexes on multi part paths are also allowed: @Entity @Index(members

SELECT clause (JPQL / Criteria API)

with the containing entities. Therefore, embedded objects that are retrieved directly by a result path expression ... results: SELECT c.name, c.capital.name FROM Country AS c The result list of this query contains ... cell contains the country name (c.name) and the second array cell contains the capital city name (c

Collections in JPQL and Criteria Queries

is contained in a specified persistent collection field. For example: 'English' MEMBER OF c.languages is TRUE if languages contains 'English' and FALSE if not. 'English' NOT MEMBER OF c.languages is TRUE if languages does not contain 'English'. [NOT] IN The [NOT] IN operator provides an additional

Storing JPA Entity Objects

of other persistable types can only be stored in the database embedded in containing entities (as ... already contains another entity of the same type with the same primary key, an EntityExistsException ... embedded in containing entity objects. Therefore, if Address is defined as an embeddable class

[ODB1] Chapter 6 - Persistent Objects

the database as part of a containing object. Objects stored explicitly by makePersistent ... or queried directly (an embedded object can only be retrieved using a reference from its containing ... .getObjectId(person); String s1 = oid.toString(); // s1 contains a temporary negative number pm

[ODB1] Chapter 2 - A Quick Tour

by step. Both sample programs are contained in ObjectDB's samples directory. 2.1 Hello World ... is expected to be: Hello World 0 Hello World 1 After two runs, the database contains a list ... source file, HelloWorld.java, containing a single class: 1 // A simple program that manages a list

[ODB1] Chapter 9 - ObjectDB Explorer

the bin/sh directory. Before using explorer.sh, you have to edit the paths that it contains ... contains (root objects are discussed in chapter 6). The "Query" window enables a user to execute JDOQL ... the "Tools | Options" menu command. The "General" Page The "General" page contains various options

[ODB1] Chapter 8 - ObjectDB Server

, packaged in the odbse.jar file. The jar file contains the entire ObjectDB implementation including ... the data directory containing all the database files that the server is allowed to access and manage ... containing his or her private database files (as demonstrated in section 8.3). The <permissions

[ODB1] Chapter 4 - JDO Metadata

A JDO metadata file is an XML file with a '.jdo' suffix, containing information about one or ... > A single persistent class, test.A, is declared by a <class> element containing <field> sub elements ... , the group contains all the fields with primitive types (e.g. int), types defined in java.lang (e.g

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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