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JDOHelper()

Constructor javax.jdo.JDOHelper JDOHelper() Some applications might prefer to use instance methods instead of static methods. Since: JDO 2.1
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javax.jdo.JDOHelper

javax.jdo Class JDOHelper java.lang.Object javax.jdo.JDOHelper Implemented Interfaces ... ; and to get its associated PersistenceManager if it has one. Since: JDO 1.0 JDOHelper() Some applications ... methods instead of static methods. Since: JDO 2.1 JDOHelper getInstance() Return the singleton
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[ODB1] Chapter 6 - Persistent Objects

(useful when a PersistenceManager is unavailable): Object oid = JDOHelper.getObjectId(obj); JDO does ... = JDOHelper.getObjectId(obj) + '@' + obj.getClass(); In this case the object can be retrieved later ... The state of an object in a JDO application can be examined using five JDOHelper static methods
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getInstance()

Static Method javax.jdo.JDOHelper JDOHelper getInstance() Return the singleton instance of JDOHelper. This instance is thread-safe. Returns: the thread-safe singleton JDOHelper Since: JDO 2.1
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getPersistenceManagerFactory(overrides, name)

Static Method javax.jdo.JDOHelper PersistenceManagerFactory getPersistenceManagerFactory( Map overrides, String name ) Returns a named PersistenceManagerFactory or persistence unit. Parameters: overrides - name - Since: JDO 2.1 See Also: getPersistenceManagerFactory(Map,String,ClassLoader,ClassLoader)
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getPersistenceManagerFactory(name, resourceLoader, pmfLoader)

Static Method javax.jdo.JDOHelper PersistenceManagerFactory getPersistenceManagerFactory( String name, ClassLoader resourceLoader, ClassLoader pmfLoader ) Returns a named PersistenceManagerFactory or persistence unit. Parameters: name - resourceLoader - pmfLoader - Since: JDO 2.0 See Also: getPersistenceManagerFactory(Map,String,ClassLoader,ClassLoader)
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getPersistenceManagerFactory(overrides, name, resourceLoader, pmfLoader)

Static Method javax.jdo.JDOHelper PersistenceManagerFactory getPersistenceManagerFactory( Map overrides, String name, ClassLoader resourceLoader, ClassLoader pmfLoader ) Returns a PersistenceManagerFactory configured based on the properties stored in the resource at name, or, if not found, returns
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getPersistenceManagerFactory(overrides, name, resourceLoader)

Static Method javax.jdo.JDOHelper PersistenceManagerFactory getPersistenceManagerFactory( Map overrides, String name, ClassLoader resourceLoader ) Returns a named PersistenceManagerFactory or persistence unit. Parameters: overrides - name - resourceLoader - Since: JDO 2.1 See Also: getPersistenceManagerFactory(Map,String,ClassLoader,ClassLoader)
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getPersistenceManagerFactory(props)

Static Method javax.jdo.JDOHelper PersistenceManagerFactory getPersistenceManagerFactory( Map props ) Get a PersistenceManagerFactory based on a Properties instance, using the current thread's context class loader to locate the PersistenceManagerFactory class. Parameters: props - a Properties
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getPersistenceManagerFactory(pmfClassLoader)

Static Method javax.jdo.JDOHelper PersistenceManagerFactory getPersistenceManagerFactory( ClassLoader pmfClassLoader ) Get the anonymous PersistenceManagerFactory configured via the standard configuration file resource "META-INF/jdoconfig.xml", using the given class loader. Parameters

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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