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| <h3>JDOHelper<a id="JDOHelper"></a></h3> |
| </div> |
| --> |
| <div id="doc-content"> |
| <div class="sect1"> |
| <h2 id="index">JDOHelper<a id="JDOHelper"></a></h2> |
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| <p>JDO provides a standard utility that gives access to useful parts of the |
| JDO persistence process. This is known as <strong>JDOHelper</strong> |
| (javax.jdo.JDOHelper) |
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| </div> |
| <div class="sect2"> |
| <h3 id="_persistencemanagerfactory_methods_a_id_persistencemanagerfactory_methods_a">PersistenceManagerFactory methods<a id="PersistenceManagerFactory_methods"></a></h3> |
| <div class="paragraph"> |
| <p>The methods in JDOHelper can be split into categories. Here we start |
| with the methods for creating the starting point for persistence, the |
| PersistenceManagerFactory (PMF)</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><strong>getPersistenceManagerFactory(Map props)</strong> - creates a PMF given a Map |
| of the properties</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(Map props, ClassLoader cl)</strong> - creates a |
| PMF given a Map of the properties, and a ClassLoader to use</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(String resource)</strong> - creates a PMF given |
| a resource defining the properties. This can be used to create a named |
| PMF in JDO2.1</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(String props, ClassLoader cl)</strong> - creates |
| a PMF given a resource defining the properties, and a ClassLoader to use</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(File props)</strong> - creates a PMF given a |
| file containing the properties</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(File props, ClassLoader cl)</strong> - creates a |
| PMF given a file containing the properties and a ClassLoader to use</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(String jndi, Context ctx)</strong> - creates a |
| PMF given a JNDI resource</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(String jndi, Context ctx, ClassLoader |
| cl)</strong> - creates a PMF given a JNDI resource and a ClassLoader to use</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(InputStream strm)</strong> - creates a PMF given |
| an InputStream</p> |
| </li> |
| <li> |
| <p><strong>getPersistenceManagerFactory(InputStream strm, ClassLoader cl)</strong> - |
| creates a PMF given an InputStream and a ClassLoader to use</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_persistence_methods_a_id_persistence_methods_a">Persistence methods<a id="Persistence_methods"></a></h3> |
| <div class="paragraph"> |
| <p>Now we move onto the operations for persistence.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><strong>getPersistenceManager(Object pc)</strong> - returns the PersistenceManager |
| associated with the passed object (if any)</p> |
| </li> |
| <li> |
| <p><strong>makeDirty(Object pc, String fieldName)</strong> - marks the field of the |
| passed object as dirty (meaning that it needs updating in ther |
| datastore)</p> |
| </li> |
| <li> |
| <p><strong>getObjectId(Object pc)</strong> - returns the object identity for the passed |
| object (if persistent)</p> |
| </li> |
| <li> |
| <p><strong>getObjectIds(Collection pc)</strong> - returns the object identities for the |
| passed objects (if persistent)</p> |
| </li> |
| <li> |
| <p><strong>getObjectIds(Object[] pc)</strong> - returns the object identities for the |
| passed objects (if persistent)</p> |
| </li> |
| <li> |
| <p><strong>getVersion(Object pc)</strong> - returns the version for the passed object |
| (if persistent)</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_lifecycle_methods_a_id_lifecycle_methods_a">Lifecycle methods<a id="Lifecycle_methods"></a></h3> |
| <div class="paragraph"> |
| <p>Now we move onto lifecycle operations</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><strong>getObjectState(Object pc)</strong> - returns the object state (JDO2.1 JDK1.5+ |
| only)</p> |
| </li> |
| <li> |
| <p><strong>isDirty(Object pc)</strong> - returns whether the passed object is dirty</p> |
| </li> |
| <li> |
| <p><strong>isTransactional(Object pc)</strong> - returns whether the passed object is |
| transactional</p> |
| </li> |
| <li> |
| <p><strong>isPersistent(Object pc)</strong> - returns whether the passed object is |
| persistent</p> |
| </li> |
| <li> |
| <p><strong>isNew(Object pc)</strong> - returns whether the passed object is new</p> |
| </li> |
| <li> |
| <p><strong>isDeleted(Object pc)</strong> - returns whether the passed object is deleted</p> |
| </li> |
| <li> |
| <p><strong>isDetached(Object pc)</strong> - returns whether the passed object is |
| detached</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
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