/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate;
import java.io.Serializable;
import java.sql.Connection;
import org.hibernate.jdbc.ReturningWork;
import org.hibernate.jdbc.Work;
import org.hibernate.stat.SessionStatistics;
/**
* The main runtime interface between a Java application and Hibernate. This is the
* central API class abstracting the notion of a persistence service.<br>
* <br>
* The lifecycle of a <tt>Session</tt> is bounded by the beginning and end of a logical
* transaction. (Long transactions might span several database transactions.)<br>
* <br>
* The main function of the <tt>Session</tt> is to offer create, read and delete operations
* for instances of mapped entity classes. Instances may exist in one of three states:<br>
* <br>
* <i>transient:</i> never persistent, not associated with any <tt>Session</tt><br>
* <i>persistent:</i> associated with a unique <tt>Session</tt><br>
* <i>detached:</i> previously persistent, not associated with any <tt>Session</tt><br>
* <br>
* Transient instances may be made persistent by calling <tt>save()</tt>,
* <tt>persist()</tt> or <tt>saveOrUpdate()</tt>. Persistent instances may be made transient
* by calling<tt> delete()</tt>. Any instance returned by a <tt>get()</tt> or
* <tt>load()</tt> method is persistent. Detached instances may be made persistent
* by calling <tt>update()</tt>, <tt>saveOrUpdate()</tt>, <tt>lock()</tt> or <tt>replicate()</tt>.
* The state of a transient or detached instance may also be made persistent as a new
* persistent instance by calling <tt>merge()</tt>.<br>
* <br>
* <tt>save()</tt> and <tt>persist()</tt> result in an SQL <tt>INSERT</tt>, <tt>delete()</tt>
* in an SQL <tt>DELETE</tt> and <tt>update()</tt> or <tt>merge()</tt> in an SQL <tt>UPDATE</tt>.
* Changes to <i>persistent</i> instances are detected at flush time and also result in an SQL
* <tt>UPDATE</tt>. <tt>saveOrUpdate()</tt> and <tt>replicate()</tt> result in either an
* <tt>INSERT</tt> or an <tt>UPDATE</tt>.<br>
* <br>
* It is not intended that implementors be threadsafe. Instead each thread/transaction
* should obtain its own instance from a <tt>SessionFactory</tt>.<br>
* <br>
* A <tt>Session</tt> instance is serializable if its persistent classes are serializable.<br>
* <br>
* A typical transaction should use the following idiom:
* <pre>
* Session sess = factory.openSession();
* Transaction tx;
* try {
* tx = sess.beginTransaction();
* //do some work
* ...
* tx.commit();
* }
* catch (Exception e) {
* if (tx!=null) tx.rollback();
* throw e;
* }
* finally {
* sess.close();
* }
* </pre>
* <br>
* If the <tt>Session</tt> throws an exception, the transaction must be rolled back
* and the session discarded. The internal state of the <tt>Session</tt> might not
* be consistent with the database after the exception occurs.
*
* @see SessionFactory
* @author Gavin King
*/
public interface Session extends SharedSessionContract {
/**
* Obtain a {@link Session} builder with the ability to grab certain information from this session.
*
* @return The session builder
*/
public SharedSessionBuilder sessionWithOptions();
/**
* Force this session to flush. Must be called at the end of a
* unit of work, before committing the transaction and closing the
* session (depending on {@link #setFlushMode(FlushMode)},
* {@link Transaction#commit()} calls this method).
* <p/>
* <i>Flushing</i> is the process of synchronizing the underlying persistent
* store with persistable state held in memory.
*
* @throws HibernateException Indicates problems flushing the session or
* talking to the database.
*/
public void flush() throws HibernateException;
/**
* Set the flush mode for this session.
* <p/>
* The flush mode determines the points at which the session is flushed.
* <i>Flushing</i> is the process of synchronizing the underlying persistent
* store with persistable state held in memory.
* <p/>
* For a logically "read only" session, it is reasonable to set the session's
* flush mode to {@link FlushMode#MANUAL} at the start of the session (in
* order to achieve some extra performance).
*
* @param flushMode the new flush mode
* @see FlushMode
*/
public void setFlushMode(FlushMode flushMode);
/**
* Get the current flush mode for this session.
*
* @return The flush mode
*/
public FlushMode getFlushMode();
/**
* Set the cache mode.
* <p/>
* Cache mode determines the manner in which this session can interact with
* the second level cache.
*
* @param cacheMode The new cache mode.
*/
public void setCacheMode(CacheMode cacheMode);
/**
* Get the current cache mode.
*
* @return The current cache mode.
*/
public CacheMode getCacheMode();
/**
* Get the session factory which created this session.
*
* @return The session factory.
* @see SessionFactory
*/
public SessionFactory getSessionFactory();
/**
* End the session by releasing the JDBC connection and cleaning up. It is
* not strictly necessary to close the session but you must at least
* {@link #disconnect()} it.
*
* @return the connection provided by the application or null.
* @throws HibernateException Indicates problems cleaning up.
*/
public Connection close() throws HibernateException;
/**
* Cancel the execution of the current query.
* <p/>
* This is the sole method on session which may be safely called from
* another thread.
*
* @throws HibernateException There was a problem canceling the query
*/
public void cancelQuery() throws HibernateException;
/**
* Check if the session is still open.
*
* @return boolean
*/
public boolean isOpen();
/**
* Check if the session is currently connected.
*
* @return boolean
*/
public boolean isConnected();
/**
* Does this session contain any changes which must be synchronized with
* the database? In other words, would any DML operations be executed if
* we flushed this session?
*
* @return True if the session contains pending changes; false otherwise.
* @throws HibernateException could not perform dirtying checking
*/
public boolean isDirty() throws HibernateException;
/**
* Will entities and proxies that are loaded into this session be made
* read-only by default?
*
* To determine the read-only/modifiable setting for a particular entity
* or proxy:
* @see Session#isReadOnly(Object)
*
* @return true, loaded entities/proxies will be made read-only by default;
* false, loaded entities/proxies will be made modifiable by default.
*/
public boolean isDefaultReadOnly();
/**
* Change the default for entities and proxies loaded into this session
* from modifiable to read-only mode, or from modifiable to read-only mode.
*
* Read-only entities are not dirty-checked and snapshots of persistent
* state are not maintained. Read-only entities can be modified, but
* changes are not persisted.
*
* When a proxy is initialized, the loaded entity will have the same
* read-only/modifiable setting as the uninitialized
* proxy has, regardless of the session's current setting.
*
* To change the read-only/modifiable setting for a particular entity
* or proxy that is already in this session:
* @see Session#setReadOnly(Object,boolean)
*
* To override this session's read-only/modifiable setting for entities
* and proxies loaded by a Query:
* @see Query#setReadOnly(boolean)
*
* @param readOnly true, the default for loaded entities/proxies is read-only;
* false, the default for loaded entities/proxies is modifiable
*/
public void setDefaultReadOnly(boolean readOnly);
/**
* Return the identifier value of the given entity as associated with this
* session. An exception is thrown if the given entity instance is transient
* or detached in relation to this session.
*
* @param object a persistent instance
* @return the identifier
* @throws TransientObjectException if the instance is transient or associated with
* a different session
*/
public Serializable getIdentifier(Object object) throws HibernateException;
/**
* Check if this instance is associated with this <tt>Session</tt>.
*
* @param object an instance of a persistent class
* @return true if the given instance is associated with this <tt>Session</tt>
*/
public boolean contains(Object object);
/**
* Remove this instance from the session cache. Changes to the instance will
* not be synchronized with the database. This operation cascades to associated
* instances if the association is mapped with <tt>cascade="evict"</tt>.
*
* @param object a persistent instance
* @throws HibernateException
*/
public void evict(Object object) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* obtaining the specified lock mode, assuming the instance exists.
*
* @param theClass a persistent class
* @param id a valid identifier of an existing persistent instance of the class
* @param lockMode the lock level
* @return the persistent instance or proxy
* @throws HibernateException
* @deprecated LockMode parameter should be replaced with LockOptions
*/
@Deprecated
public Object load(Class theClass, Serializable id, LockMode lockMode) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* obtaining the specified lock mode, assuming the instance exists.
*
* @param theClass a persistent class
* @param id a valid identifier of an existing persistent instance of the class
* @param lockOptions contains the lock level
* @return the persistent instance or proxy
* @throws HibernateException
*/
public Object load(Class theClass, Serializable id, LockOptions lockOptions) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* obtaining the specified lock mode, assuming the instance exists.
*
* @param entityName a persistent class
* @param id a valid identifier of an existing persistent instance of the class
* @param lockMode the lock level
* @return the persistent instance or proxy
* @throws HibernateException
* @deprecated LockMode parameter should be replaced with LockOptions
*/
@Deprecated
public Object load(String entityName, Serializable id, LockMode lockMode) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* obtaining the specified lock mode, assuming the instance exists.
*
* @param entityName a persistent class
* @param id a valid identifier of an existing persistent instance of the class
* @param lockOptions contains the lock level
* @return the persistent instance or proxy
* @throws HibernateException
*/
public Object load(String entityName, Serializable id, LockOptions lockOptions) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* assuming that the instance exists. This method might return a proxied instance that
* is initialized on-demand, when a non-identifier method is accessed.
* <br><br>
* You should not use this method to determine if an instance exists (use <tt>get()</tt>
* instead). Use this only to retrieve an instance that you assume exists, where non-existence
* would be an actual error.
*
* @param theClass a persistent class
* @param id a valid identifier of an existing persistent instance of the class
* @return the persistent instance or proxy
* @throws HibernateException
*/
public Object load(Class theClass, Serializable id) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* assuming that the instance exists. This method might return a proxied instance that
* is initialized on-demand, when a non-identifier method is accessed.
* <br><br>
* You should not use this method to determine if an instance exists (use <tt>get()</tt>
* instead). Use this only to retrieve an instance that you assume exists, where non-existence
* would be an actual error.
*
* @param entityName a persistent class
* @param id a valid identifier of an existing persistent instance of the class
* @return the persistent instance or proxy
* @throws HibernateException
*/
public Object load(String entityName, Serializable id) throws HibernateException;
/**
* Read the persistent state associated with the given identifier into the given transient
* instance.
*
* @param object an "empty" instance of the persistent class
* @param id a valid identifier of an existing persistent instance of the class
* @throws HibernateException
*/
public void load(Object object, Serializable id) throws HibernateException;
/**
* Persist the state of the given detached instance, reusing the current
* identifier value. This operation cascades to associated instances if
* the association is mapped with <tt>cascade="replicate"</tt>.
*
* @param object a detached instance of a persistent class
*/
public void replicate(Object object, ReplicationMode replicationMode) throws HibernateException;
/**
* Persist the state of the given detached instance, reusing the current
* identifier value. This operation cascades to associated instances if
* the association is mapped with <tt>cascade="replicate"</tt>.
*
* @param object a detached instance of a persistent class
*/
public void replicate(String entityName, Object object, ReplicationMode replicationMode) throws HibernateException;
/**
* Persist the given transient instance, first assigning a generated identifier. (Or
* using the current value of the identifier property if the <tt>assigned</tt>
* generator is used.) This operation cascades to associated instances if the
* association is mapped with <tt>cascade="save-update"</tt>.
*
* @param object a transient instance of a persistent class
* @return the generated identifier
* @throws HibernateException
*/
public Serializable save(Object object) throws HibernateException;
/**
* Persist the given transient instance, first assigning a generated identifier. (Or
* using the current value of the identifier property if the <tt>assigned</tt>
* generator is used.) This operation cascades to associated instances if the
* association is mapped with <tt>cascade="save-update"</tt>.
*
* @param object a transient instance of a persistent class
* @return the generated identifier
* @throws HibernateException
*/
public Serializable save(String entityName, Object object) throws HibernateException;
/**
* Either {@link #save(Object)} or {@link #update(Object)} the given
* instance, depending upon resolution of the unsaved-value checks (see the
* manual for discussion of unsaved-value checking).
* <p/>
* This operation cascades to associated instances if the association is mapped
* with <tt>cascade="save-update"</tt>.
*
* @see Session#save(java.lang.Object)
* @see Session#update(Object object)
* @param object a transient or detached instance containing new or updated state
* @throws HibernateException
*/
public void saveOrUpdate(Object object) throws HibernateException;
/**
* Either {@link #save(String, Object)} or {@link #update(String, Object)}
* the given instance, depending upon resolution of the unsaved-value checks
* (see the manual for discussion of unsaved-value checking).
* <p/>
* This operation cascades to associated instances if the association is mapped
* with <tt>cascade="save-update"</tt>.
*
* @see Session#save(String,Object)
* @see Session#update(String,Object)
* @param object a transient or detached instance containing new or updated state
* @throws HibernateException
*/
public void saveOrUpdate(String entityName, Object object) throws HibernateException;
/**
* Update the persistent instance with the identifier of the given detached
* instance. If there is a persistent instance with the same identifier,
* an exception is thrown. This operation cascades to associated instances
* if the association is mapped with <tt>cascade="save-update"</tt>.
*
* @param object a detached instance containing updated state
* @throws HibernateException
*/
public void update(Object object) throws HibernateException;
/**
* Update the persistent instance with the identifier of the given detached
* instance. If there is a persistent instance with the same identifier,
* an exception is thrown. This operation cascades to associated instances
* if the association is mapped with <tt>cascade="save-update"</tt>.
*
* @param object a detached instance containing updated state
* @throws HibernateException
*/
public void update(String entityName, Object object) throws HibernateException;
/**
* Copy the state of the given object onto the persistent object with the same
* identifier. If there is no persistent instance currently associated with
* the session, it will be loaded. Return the persistent instance. If the
* given instance is unsaved, save a copy of and return it as a newly persistent
* instance. The given instance does not become associated with the session.
* This operation cascades to associated instances if the association is mapped
* with <tt>cascade="merge"</tt>.<br>
* <br>
* The semantics of this method are defined by JSR-220.
*
* @param object a detached instance with state to be copied
* @return an updated persistent instance
*/
public Object merge(Object object) throws HibernateException;
/**
* Copy the state of the given object onto the persistent object with the same
* identifier. If there is no persistent instance currently associated with
* the session, it will be loaded. Return the persistent instance. If the
* given instance is unsaved, save a copy of and return it as a newly persistent
* instance. The given instance does not become associated with the session.
* This operation cascades to associated instances if the association is mapped
* with <tt>cascade="merge"</tt>.<br>
* <br>
* The semantics of this method are defined by JSR-220.
*
* @param object a detached instance with state to be copied
* @return an updated persistent instance
*/
public Object merge(String entityName, Object object) throws HibernateException;
/**
* Make a transient instance persistent. This operation cascades to associated
* instances if the association is mapped with <tt>cascade="persist"</tt>.<br>
* <br>
* The semantics of this method are defined by JSR-220.
*
* @param object a transient instance to be made persistent
*/
public void persist(Object object) throws HibernateException;
/**
* Make a transient instance persistent. This operation cascades to associated
* instances if the association is mapped with <tt>cascade="persist"</tt>.<br>
* <br>
* The semantics of this method are defined by JSR-220.
*
* @param object a transient instance to be made persistent
*/
public void persist(String entityName, Object object) throws HibernateException;
/**
* Remove a persistent instance from the datastore. The argument may be
* an instance associated with the receiving <tt>Session</tt> or a transient
* instance with an identifier associated with existing persistent state.
* This operation cascades to associated instances if the association is mapped
* with <tt>cascade="delete"</tt>.
*
* @param object the instance to be removed
* @throws HibernateException
*/
public void delete(Object object) throws HibernateException;
/**
* Remove a persistent instance from the datastore. The <b>object</b> argument may be
* an instance associated with the receiving <tt>Session</tt> or a transient
* instance with an identifier associated with existing persistent state.
* This operation cascades to associated instances if the association is mapped
* with <tt>cascade="delete"</tt>.
*
* @param entityName The entity name for the instance to be removed.
* @param object the instance to be removed
* @throws HibernateException
*/
public void delete(String entityName, Object object) throws HibernateException;
/**
* Obtain the specified lock level upon the given object. This may be used to
* perform a version check (<tt>LockMode.READ</tt>), to upgrade to a pessimistic
* lock (<tt>LockMode.PESSIMISTIC_WRITE</tt>), or to simply reassociate a transient instance
* with a session (<tt>LockMode.NONE</tt>). This operation cascades to associated
* instances if the association is mapped with <tt>cascade="lock"</tt>.
*
* @param object a persistent or transient instance
* @param lockMode the lock level
* @throws HibernateException
* @deprecated instead call buildLockRequest(LockMode).lock(object)
*/
@Deprecated
public void lock(Object object, LockMode lockMode) throws HibernateException;
/**
* Obtain the specified lock level upon the given object. This may be used to
* perform a version check (<tt>LockMode.OPTIMISTIC</tt>), to upgrade to a pessimistic
* lock (<tt>LockMode.PESSIMISTIC_WRITE</tt>), or to simply reassociate a transient instance
* with a session (<tt>LockMode.NONE</tt>). This operation cascades to associated
* instances if the association is mapped with <tt>cascade="lock"</tt>.
*
* @param object a persistent or transient instance
* @param lockMode the lock level
* @throws HibernateException
* @deprecated instead call buildLockRequest(LockMode).lock(entityName, object)
*/
@Deprecated
public void lock(String entityName, Object object, LockMode lockMode) throws HibernateException;
/**
* Build a LockRequest that specifies the LockMode, pessimistic lock timeout and lock scope.
* timeout and scope is ignored for optimistic locking. After building the LockRequest,
* call LockRequest.lock to perform the requested locking.
*
* Use: session.buildLockRequest().
* setLockMode(LockMode.PESSIMISTIC_WRITE).setTimeOut(1000 * 60).lock(entity);
*
* @param lockOptions contains the lock level
* @return a lockRequest that can be used to lock the passed object.
* @throws HibernateException
*/
public LockRequest buildLockRequest(LockOptions lockOptions);
/**
* Re-read the state of the given instance from the underlying database. It is
* inadvisable to use this to implement long-running sessions that span many
* business tasks. This method is, however, useful in certain special circumstances.
* For example
* <ul>
* <li>where a database trigger alters the object state upon insert or update
* <li>after executing direct SQL (eg. a mass update) in the same session
* <li>after inserting a <tt>Blob</tt> or <tt>Clob</tt>
* </ul>
*
* @param object a persistent or detached instance
* @throws HibernateException
*/
public void refresh(Object object) throws HibernateException;
/**
* Re-read the state of the given instance from the underlying database. It is
* inadvisable to use this to implement long-running sessions that span many
* business tasks. This method is, however, useful in certain special circumstances.
* For example
* <ul>
* <li>where a database trigger alters the object state upon insert or update
* <li>after executing direct SQL (eg. a mass update) in the same session
* <li>after inserting a <tt>Blob</tt> or <tt>Clob</tt>
* </ul>
*
* @param entityName a persistent class
* @param object a persistent or detached instance
* @throws HibernateException
*/
public void refresh(String entityName, Object object) throws HibernateException;
/**
* Re-read the state of the given instance from the underlying database, with
* the given <tt>LockMode</tt>. It is inadvisable to use this to implement
* long-running sessions that span many business tasks. This method is, however,
* useful in certain special circumstances.
*
* @param object a persistent or detached instance
* @param lockMode the lock mode to use
* @throws HibernateException
* @deprecated LockMode parameter should be replaced with LockOptions
*/
@Deprecated
public void refresh(Object object, LockMode lockMode) throws HibernateException;
/**
* Re-read the state of the given instance from the underlying database, with
* the given <tt>LockMode</tt>. It is inadvisable to use this to implement
* long-running sessions that span many business tasks. This method is, however,
* useful in certain special circumstances.
*
* @param object a persistent or detached instance
* @param lockOptions contains the lock mode to use
* @throws HibernateException
*/
public void refresh(Object object, LockOptions lockOptions) throws HibernateException;
/**
* Re-read the state of the given instance from the underlying database, with
* the given <tt>LockMode</tt>. It is inadvisable to use this to implement
* long-running sessions that span many business tasks. This method is, however,
* useful in certain special circumstances.
*
* @param entityName a persistent class
* @param object a persistent or detached instance
* @param lockOptions contains the lock mode to use
* @throws HibernateException
*/
public void refresh(String entityName, Object object, LockOptions lockOptions) throws HibernateException;
/**
* Determine the current lock mode of the given object.
*
* @param object a persistent instance
* @return the current lock mode
* @throws HibernateException
*/
public LockMode getCurrentLockMode(Object object) throws HibernateException;
/**
* Create a {@link Query} instance for the given collection and filter string. Contains an implicit {@code FROM}
* element named {@code this} which refers to the defined table for the collection elements, as well as an implicit
* {@code WHERE} restriction for this particular collection instance's key value.
*
* @param collection a persistent collection
* @param queryString a Hibernate query fragment.
*
* @return The query instance for manipulation and execution
*/
public Query createFilter(Object collection, String queryString);
/**
* Completely clear the session. Evict all loaded instances and cancel all pending
* saves, updates and deletions. Do not close open iterators or instances of
* <tt>ScrollableResults</tt>.
*/
public void clear();
/**
* Return the persistent instance of the given entity class with the given identifier,
* or null if there is no such persistent instance. (If the instance is already associated
* with the session, return that instance. This method never returns an uninitialized instance.)
*
* @param clazz a persistent class
* @param id an identifier
* @return a persistent instance or null
* @throws HibernateException
*/
public Object get(Class clazz, Serializable id) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* or null if there is no such persistent instance. (If the instance is already associated
* with the session, return that instance. This method never returns an uninitialized instance.)
* Obtain the specified lock mode if the instance exists.
*
* @param clazz a persistent class
* @param id an identifier
* @param lockMode the lock mode
* @return a persistent instance or null
* @throws HibernateException
* @deprecated LockMode parameter should be replaced with LockOptions
*/
@Deprecated
public Object get(Class clazz, Serializable id, LockMode lockMode) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* or null if there is no such persistent instance. (If the instance is already associated
* with the session, return that instance. This method never returns an uninitialized instance.)
* Obtain the specified lock mode if the instance exists.
*
* @param clazz a persistent class
* @param id an identifier
* @param lockOptions the lock mode
* @return a persistent instance or null
* @throws HibernateException
*/
public Object get(Class clazz, Serializable id, LockOptions lockOptions) throws HibernateException;
/**
* Return the persistent instance of the given named entity with the given identifier,
* or null if there is no such persistent instance. (If the instance is already associated
* with the session, return that instance. This method never returns an uninitialized instance.)
*
* @param entityName the entity name
* @param id an identifier
* @return a persistent instance or null
* @throws HibernateException
*/
public Object get(String entityName, Serializable id) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* or null if there is no such persistent instance. (If the instance is already associated
* with the session, return that instance. This method never returns an uninitialized instance.)
* Obtain the specified lock mode if the instance exists.
*
* @param entityName the entity name
* @param id an identifier
* @param lockMode the lock mode
* @return a persistent instance or null
* @throws HibernateException
* @deprecated LockMode parameter should be replaced with LockOptions
*/
@Deprecated
public Object get(String entityName, Serializable id, LockMode lockMode) throws HibernateException;
/**
* Return the persistent instance of the given entity class with the given identifier,
* or null if there is no such persistent instance. (If the instance is already associated
* with the session, return that instance. This method never returns an uninitialized instance.)
* Obtain the specified lock mode if the instance exists.
*
* @param entityName the entity name
* @param id an identifier
* @param lockOptions contains the lock mode
* @return a persistent instance or null
* @throws HibernateException
*/
public Object get(String entityName, Serializable id, LockOptions lockOptions) throws HibernateException;
/**
* Return the entity name for a persistent entity
*
* @param object a persistent entity
* @return the entity name
* @throws HibernateException
*/
public String getEntityName(Object object) throws HibernateException;
/**
* Enable the named filter for this current session.
*
* @param filterName The name of the filter to be enabled.
* @return The Filter instance representing the enabled filter.
*/
public Filter enableFilter(String filterName);
/**
* Retrieve a currently enabled filter by name.
*
* @param filterName The name of the filter to be retrieved.
* @return The Filter instance representing the enabled filter.
*/
public Filter getEnabledFilter(String filterName);
/**
* Disable the named filter for the current session.
*
* @param filterName The name of the filter to be disabled.
*/
public void disableFilter(String filterName);
/**
* Get the statistics for this session.
*/
public SessionStatistics getStatistics();
/**
* Is the specified entity or proxy read-only?
*
* To get the default read-only/modifiable setting used for
* entities and proxies that are loaded into the session:
* @see org.hibernate.Session#isDefaultReadOnly()
*
* @param entityOrProxy, an entity or HibernateProxy
* @return true, the entity or proxy is read-only;
* false, the entity or proxy is modifiable.
*/
public boolean isReadOnly(Object entityOrProxy);
/**
* Set an unmodified persistent object to read-only mode, or a read-only
* object to modifiable mode. In read-only mode, no snapshot is maintained,
* the instance is never dirty checked, and changes are not persisted.
*
* If the entity or proxy already has the specified read-only/modifiable
* setting, then this method does nothing.
*
* To set the default read-only/modifiable setting used for
* entities and proxies that are loaded into the session:
* @see org.hibernate.Session#setDefaultReadOnly(boolean)
*
* To override this session's read-only/modifiable setting for entities
* and proxies loaded by a Query:
* @see Query#setReadOnly(boolean)
*
* @param entityOrProxy, an entity or HibernateProxy
* @param readOnly, if true, the entity or proxy is made read-only;
* if false, the entity or proxy is made modifiable.
*/
public void setReadOnly(Object entityOrProxy, boolean readOnly);
/**
* Controller for allowing users to perform JDBC related work using the Connection
* managed by this Session.
*
* @param work The work to be performed.
* @throws HibernateException Generally indicates wrapped {@link java.sql.SQLException}
*/
public void doWork(Work work) throws HibernateException;
/**
* Controller for allowing users to perform JDBC related work using the Connection
* managed by this Session, returning the result from calling <code>work.execute()</code>
* ({@link ReturningWork<T>.execute(Connection)}/
*
* @param work The work to be performed.
* @return the result from calling <code>work.execute()</code>.
* @throws HibernateException Generally indicates wrapped {@link java.sql.SQLException}
*/
public <T> T doReturningWork(ReturningWork<T> work) throws HibernateException;
/**
* Disconnect the session from its underlying JDBC connection. This is intended for use in cases where the
* application has supplied the JDBC connection to the session and which require long-sessions (aka, conversations).
* <p/>
* It is considered an error to call this method on a session which was not opened by supplying the JDBC connection
* and an exception will be thrown.
* <p/>
* For non-user-supplied scenarios, normal transaction management already handles disconnection and reconnection
* automatically.
*
* @return the application-supplied connection or {@literal null}
*
* @see #reconnect(Connection)
*/
Connection disconnect() throws HibernateException;
/**
* Reconnect to the given JDBC connection.
*
* @param connection a JDBC connection
*
* @see #disconnect()
*/
void reconnect(Connection connection) throws HibernateException;
/**
* Is a particular fetch profile enabled on this session?
*
* @param name The name of the profile to be checked.
* @return True if fetch profile is enabled; false if not.
* @throws UnknownProfileException Indicates that the given name does not
* match any known profile names
*
* @see org.hibernate.engine.profile.FetchProfile for discussion of this feature
*/
public boolean isFetchProfileEnabled(String name) throws UnknownProfileException;
/**
* Enable a particular fetch profile on this session. No-op if requested
* profile is already enabled.
*
* @param name The name of the fetch profile to be enabled.
* @throws UnknownProfileException Indicates that the given name does not
* match any known profile names
*
* @see org.hibernate.engine.profile.FetchProfile for discussion of this feature
*/
public void enableFetchProfile(String name) throws UnknownProfileException;
/**
* Disable a particular fetch profile on this session. No-op if requested
* profile is already disabled.
*
* @param name The name of the fetch profile to be disabled.
* @throws UnknownProfileException Indicates that the given name does not
* match any known profile names
*
* @see org.hibernate.engine.profile.FetchProfile for discussion of this feature
*/
public void disableFetchProfile(String name) throws UnknownProfileException;
/**
* Convenience access to the {@link TypeHelper} associated with this session's {@link SessionFactory}.
* <p/>
* Equivalent to calling {@link #getSessionFactory()}.{@link SessionFactory#getTypeHelper getTypeHelper()}
*
* @return The {@link TypeHelper} associated with this session's {@link SessionFactory}
*/
public TypeHelper getTypeHelper();
/**
* Retrieve this session's helper/delegate for creating LOB instances.
*
* @return This session's LOB helper
*/
public LobHelper getLobHelper();
/**
* Contains locking details (LockMode, Timeout and Scope).
*/
public interface LockRequest {
static final int PESSIMISTIC_NO_WAIT = 0;
static final int PESSIMISTIC_WAIT_FOREVER = -1;
/**
* Get the lock mode.
*
* @return the lock mode.
*/
LockMode getLockMode();
/**
* Specify the LockMode to be used. The default is LockMode.none.
*
* @param lockMode
*
* @return this LockRequest instance for operation chaining.
*/
LockRequest setLockMode(LockMode lockMode);
/**
* Get the timeout setting.
*
* @return timeout in milliseconds, -1 for indefinite wait and 0 for no wait.
*/
int getTimeOut();
/**
* Specify the pessimistic lock timeout (check if your dialect supports this option).
* The default pessimistic lock behavior is to wait forever for the lock.
*
* @param timeout is time in milliseconds to wait for lock. -1 means wait forever and 0 means no wait.
*
* @return this LockRequest instance for operation chaining.
*/
LockRequest setTimeOut(int timeout);
/**
* Check if locking is cascaded to owned collections and relationships.
*
* @return true if locking will be extended to owned collections and relationships.
*/
boolean getScope();
/**
* Specify if LockMode should be cascaded to owned collections and relationships.
* The association must be mapped with {@code cascade="lock"} for scope=true to work.
*
* @param scope {@code true} to cascade locks; {@code false} to not.
*
* @return {@code this}, for method chaining
*/
LockRequest setScope(boolean scope);
void lock(String entityName, Object object) throws HibernateException;
public void lock(Object object) throws HibernateException;
}
}