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ObjectDB Object Database Features

attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented ... cache (per EntityManagerFactory). Database file page cache. Query program cache (for repeating queries with different arguments). Query result cache (for repeating queries with the same arguments


Static Field javax.jdo.Constants String OPTION_UNCONSTRAINED_QUERY_VARIABLES "javax.jdo.option.UnconstrainedQueryVariables" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()


Method javax.jdo.Query void setGrouping( String group ) Set the grouping expressions, optionally including a "having" clause. When grouping is specified, each result expression must either be an expression contained in the grouping, or an aggregate evaluated once per group. Parameters: group


Method javax.jdo.Query void setExtensions( Map extensions ) Set multiple extensions, or use null to clear all extensions. Map keys and values are not standard. An implementation must ignore entries that are not recognized. Parameters: extensions - the map of extensions Since: JDO 2.0 See Also: addExtension


Method javax.jdo.Query boolean getIgnoreCache() Get the ignoreCache option setting. Returns: the ignoreCache option setting. Since: JDO 1.0 See Also: setIgnoreCache


Method javax.jdo.Query long deletePersistentAll() Deletes all the instances of the candidate class that pass the filter. Returns the number of instances of the candidate class that were deleted, specifically not including the number of dependent and embedded instances. Dirty instances of affected


Method javax.jdo.Query void declareImports( String imports ) Set the import statements to be used to identify the fully qualified name of variables or parameters. Parameters and unbound variables might come from a different class from the candidate class, and the names need to be declared in


Annotation Element javax.jdo.annotations.Query Class resultClass Result class into which to put the results. Returns: the class of the result Default value: void.class Since: JDO 2.1


Annotation Element javax.jdo.annotations.Query Extension[] extensions Vendor extensions. Returns: the vendor extensions Default value: {} Since: JDO 2.1

[ODB1] Chapter 9 - ObjectDB Explorer

to browse databases, execute JDOQL queries, create new databases and edit the content of existing ... database objects visually, navigate among them and execute queries is very valuable during development ... contains (root objects are discussed in chapter 6). The "Query" window enables a user to execute JDOQL

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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