org.hibernate

Interface Session

All Superinterfaces:
Serializable
Known Subinterfaces:
EventSource, Session
Known Implementing Classes:
SessionImpl

public interface Session
extends Serializable

The main runtime interface between a Java application and Hibernate. This is the central API class abstracting the notion of a persistence service.

The lifecycle of a Session is bounded by the beginning and end of a logical transaction. (Long transactions might span several database transactions.)

The main function of the Session is to offer create, read and delete operations for instances of mapped entity classes. Instances may exist in one of three states:

transient: never persistent, not associated with any Session
persistent: associated with a unique Session
detached: previously persistent, not associated with any Session

Transient instances may be made persistent by calling save(), persist() or saveOrUpdate(). Persistent instances may be made transient by calling delete(). Any instance returned by a get() or load() method is persistent. Detached instances may be made persistent by calling update(), saveOrUpdate(), lock() or replicate(). The state of a transient or detached instance may also be made persistent as a new persistent instance by calling merge().

save() and persist() result in an SQL INSERT, delete() in an SQL DELETE and update() or merge() in an SQL UPDATE. Changes to persistent instances are detected at flush time and also result in an SQL UPDATE. saveOrUpdate() and replicate() result in either an INSERT or an UPDATE.

It is not intended that implementors be threadsafe. Instead each thread/transaction should obtain its own instance from a SessionFactory.

A Session instance is serializable if its persistent classes are serializable.

A typical transaction should use the following idiom:
 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();
 }
 

If the Session throws an exception, the transaction must be rolled back and the session discarded. The internal state of the Session might not be consistent with the database after the exception occurs.
Author:
Gavin King
See Also:
SessionFactory

Method Summary

Transaction
beginTransaction()
Begin a unit of work and return the associated Transaction object.
void
cancelQuery()
Cancel the execution of the current query.
void
clear()
Completely clear the session.
Connection
close()
End the session by releasing the JDBC connection and cleaning up.
Connection
connection()
Deprecated. (scheduled for removal in 4.x).
boolean
contains(Object object)
Check if this instance is associated with this Session.
Criteria
createCriteria(Class persistentClass)
Create a new Criteria instance, for the given entity class, or a superclass of an entity class.
Criteria
createCriteria(Class persistentClass, String alias)
Create a new Criteria instance, for the given entity class, or a superclass of an entity class, with the given alias.
Criteria
createCriteria(String entityName)
Create a new Criteria instance, for the given entity name.
Criteria
createCriteria(String entityName, String alias)
Create a new Criteria instance, for the given entity name, with the given alias.
Query
createFilter(Object collection, String queryString)
Create a new instance of Query for the given collection and filter string.
Query
createQuery(String queryString)
Create a new instance of Query for the given HQL query string.
SQLQuery
createSQLQuery(String queryString)
Create a new instance of SQLQuery for the given SQL query string.
void
delete(Object object)
Remove a persistent instance from the datastore.
void
delete(String entityName, Object object)
Remove a persistent instance from the datastore.
void
disableFilter(String filterName)
Disable the named filter for the current session.
Connection
disconnect()
Disconnect the Session from the current JDBC connection.
void
doWork(Work work)
Controller for allowing users to perform JDBC related work using the Connection managed by this Session.
Filter
enableFilter(String filterName)
Enable the named filter for this current session.
void
evict(Object object)
Remove this instance from the session cache.
void
flush()
Force this session to flush.
Object
get(Class clazz, Serializable id)
Return the persistent instance of the given entity class with the given identifier, or null if there is no such persistent instance.
Object
get(Class clazz, Serializable id, LockMode lockMode)
Return the persistent instance of the given entity class with the given identifier, or null if there is no such persistent instance.
Object
get(String entityName, Serializable id)
Return the persistent instance of the given named entity with the given identifier, or null if there is no such persistent instance.
Object
get(String entityName, Serializable id, LockMode lockMode)
Return the persistent instance of the given entity class with the given identifier, or null if there is no such persistent instance.
CacheMode
getCacheMode()
Get the current cache mode.
LockMode
getCurrentLockMode(Object object)
Determine the current lock mode of the given object.
Filter
getEnabledFilter(String filterName)
Retrieve a currently enabled filter by name.
EntityMode
getEntityMode()
Retrieve the entity mode in effect for this session.
String
getEntityName(Object object)
Return the entity name for a persistent entity
FlushMode
getFlushMode()
Get the current flush mode for this session.
Serializable
getIdentifier(Object object)
Return the identifier value of the given entity as associated with this session.
Query
getNamedQuery(String queryName)
Obtain an instance of Query for a named query string defined in the mapping file.
Session
getSession(EntityMode entityMode)
Starts a new Session with the given entity mode in effect.
SessionFactory
getSessionFactory()
Get the session factory which created this session.
SessionStatistics
getStatistics()
Get the statistics for this session.
Transaction
getTransaction()
Get the Transaction instance associated with this session.
boolean
isConnected()
Check if the session is currently connected.
boolean
isDirty()
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?
boolean
isOpen()
Check if the session is still open.
Object
load(Class theClass, Serializable id)
Return the persistent instance of the given entity class with the given identifier, assuming that the instance exists.
Object
load(Class theClass, Serializable id, LockMode lockMode)
Return the persistent instance of the given entity class with the given identifier, obtaining the specified lock mode, assuming the instance exists.
void
load(Object object, Serializable id)
Read the persistent state associated with the given identifier into the given transient instance.
Object
load(String entityName, Serializable id)
Return the persistent instance of the given entity class with the given identifier, assuming that the instance exists.
Object
load(String entityName, Serializable id, LockMode lockMode)
Return the persistent instance of the given entity class with the given identifier, obtaining the specified lock mode, assuming the instance exists.
void
lock(Object object, LockMode lockMode)
Obtain the specified lock level upon the given object.
void
lock(String entityName, Object object, LockMode lockMode)
Obtain the specified lock level upon the given object.
Object
merge(Object object)
Copy the state of the given object onto the persistent object with the same identifier.
Object
merge(String entityName, Object object)
Copy the state of the given object onto the persistent object with the same identifier.
void
persist(Object object)
Make a transient instance persistent.
void
persist(String entityName, Object object)
Make a transient instance persistent.
void
reconnect()
Deprecated. Manual reconnection is only needed in the case of application-supplied connections, in which case the reconnect(java.sql.Connection) for should be used.
void
reconnect(Connection connection)
Reconnect to the given JDBC connection.
void
refresh(Object object)
Re-read the state of the given instance from the underlying database.
void
refresh(Object object, LockMode lockMode)
Re-read the state of the given instance from the underlying database, with the given LockMode.
void
replicate(Object object, ReplicationMode replicationMode)
Persist the state of the given detached instance, reusing the current identifier value.
void
replicate(String entityName, Object object, ReplicationMode replicationMode)
Persist the state of the given detached instance, reusing the current identifier value.
Serializable
save(Object object)
Persist the given transient instance, first assigning a generated identifier.
Serializable
save(String entityName, Object object)
Persist the given transient instance, first assigning a generated identifier.
void
saveOrUpdate(Object object)
Either save(Object) or update(Object) the given instance, depending upon resolution of the unsaved-value checks (see the manual for discussion of unsaved-value checking).
void
saveOrUpdate(String entityName, Object object)
Either save(String,Object) or update(String,Object) the given instance, depending upon resolution of the unsaved-value checks (see the manual for discussion of unsaved-value checking).
void
setCacheMode(CacheMode cacheMode)
Set the cache mode.
void
setFlushMode(FlushMode flushMode)
Set the flush mode for this session.
void
setReadOnly(Object entity, boolean readOnly)
Set an unmodified persistent object to read only mode, or a read only object to modifiable mode.
void
update(Object object)
Update the persistent instance with the identifier of the given detached instance.
void
update(String entityName, Object object)
Update the persistent instance with the identifier of the given detached instance.

Method Details

beginTransaction

public Transaction beginTransaction()
            throws HibernateException
Begin a unit of work and return the associated Transaction object. If a new underlying transaction is required, begin the transaction. Otherwise continue the new work in the context of the existing underlying transaction. The class of the returned Transaction object is determined by the property hibernate.transaction_factory.
Returns:
a Transaction instance
See Also:
Transaction

cancelQuery

public void cancelQuery()
            throws HibernateException
Cancel the execution of the current query.

This is the sole method on session which may be safely called from another thread.

Throws:
HibernateException - There was a problem canceling the query

clear

public void clear()
Completely clear the session. Evict all loaded instances and cancel all pending saves, updates and deletions. Do not close open iterators or instances of ScrollableResults.

close

public Connection close()
            throws HibernateException
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 disconnect() it.
Returns:
the connection provided by the application or null.
Throws:
HibernateException - Indicates problems cleaning up.

connection

public Connection connection()
            throws HibernateException

Deprecated. (scheduled for removal in 4.x). Replacement depends on need; for doing direct JDBC stuff use doWork(Work); for opening a 'temporary Session' use (TBD).

Get the JDBC connection of this Session.

If the session is using aggressive collection release (as in a CMT environment), it is the application's responsibility to close the connection returned by this call. Otherwise, the application should not close the connection.
Returns:
the JDBC connection in use by the Session
Throws:
HibernateException - if the Session is disconnected

contains

public boolean contains(Object object)
Check if this instance is associated with this Session.
Parameters:
object - an instance of a persistent class
Returns:
true if the given instance is associated with this Session

createCriteria

public Criteria createCriteria(Class persistentClass)
Create a new Criteria instance, for the given entity class, or a superclass of an entity class.
Parameters:
persistentClass - a class, which is persistent, or has persistent subclasses
Returns:
Criteria

createCriteria

public Criteria createCriteria(Class persistentClass,
                               String alias)
Create a new Criteria instance, for the given entity class, or a superclass of an entity class, with the given alias.
Parameters:
persistentClass - a class, which is persistent, or has persistent subclasses
Returns:
Criteria

createCriteria

public Criteria createCriteria(String entityName)
Create a new Criteria instance, for the given entity name.
Parameters:
entityName -
Returns:
Criteria

createCriteria

public Criteria createCriteria(String entityName,
                               String alias)
Create a new Criteria instance, for the given entity name, with the given alias.
Parameters:
entityName -
Returns:
Criteria

createFilter

public Query createFilter(Object collection,
                          String queryString)
            throws HibernateException
Create a new instance of Query for the given collection and filter string.
Parameters:
collection - a persistent collection
queryString - a Hibernate query
Returns:
Query

createQuery

public Query createQuery(String queryString)
            throws HibernateException
Create a new instance of Query for the given HQL query string.
Parameters:
queryString - a HQL query
Returns:
Query

createSQLQuery

public SQLQuery createSQLQuery(String queryString)
            throws HibernateException
Create a new instance of SQLQuery for the given SQL query string.
Parameters:
queryString - a SQL query
Returns:
SQLQuery

delete

public void delete(Object object)
            throws HibernateException
Remove a persistent instance from the datastore. The argument may be an instance associated with the receiving Session or a transient instance with an identifier associated with existing persistent state. This operation cascades to associated instances if the association is mapped with cascade="delete".
Parameters:
object - the instance to be removed

delete

public void delete(String entityName,
                   Object object)
            throws HibernateException
Remove a persistent instance from the datastore. The object argument may be an instance associated with the receiving Session or a transient instance with an identifier associated with existing persistent state. This operation cascades to associated instances if the association is mapped with cascade="delete".
Parameters:
entityName - The entity name for the instance to be removed.
object - the instance to be removed

disableFilter

public void disableFilter(String filterName)
Disable the named filter for the current session.
Parameters:
filterName - The name of the filter to be disabled.

disconnect

public Connection disconnect()
            throws HibernateException
Disconnect the Session from the current JDBC connection. If the connection was obtained by Hibernate close it and return it to the connection pool; otherwise, return it to the application.

This is used by applications which supply JDBC connections to Hibernate and which require long-sessions (or long-conversations)

Note that disconnect() called on a session where the connection was retrieved by Hibernate through its configured ConnectionProvider has no effect, provided ConnectionReleaseMode.ON_CLOSE is not in effect.

Returns:
the application-supplied connection or null

doWork

public void doWork(Work work)
            throws HibernateException
Controller for allowing users to perform JDBC related work using the Connection managed by this Session.
Parameters:
work - The work to be performed.
Throws:
HibernateException - Generally indicates wrapped java.sql.SQLException

enableFilter

public Filter enableFilter(String filterName)
Enable the named filter for this current session.
Parameters:
filterName - The name of the filter to be enabled.
Returns:
The Filter instance representing the enabled fiter.

evict

public void evict(Object object)
            throws HibernateException
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 cascade="evict".
Parameters:
object - a persistent instance

flush

public void flush()
            throws HibernateException
Force this session to flush. Must be called at the end of a unit of work, before commiting the transaction and closing the session (depending on flush-mode, Transaction.commit() calls this method).

Flushing 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.

get

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.
Parameters:
clazz - a persistent class
id - an identifier
Returns:
a persistent instance or null

get

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.
Parameters:
clazz - a persistent class
id - an identifier
lockMode - the lock mode
Returns:
a persistent instance or null

get

public Object get(String entityName,
                  Serializable id)
            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.)
Parameters:
entityName - the entity name
id - an identifier
Returns:
a persistent instance or null

get

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.
Parameters:
entityName - the entity name
id - an identifier
lockMode - the lock mode
Returns:
a persistent instance or null

getCacheMode

public CacheMode getCacheMode()
Get the current cache mode.
Returns:
The current cache mode.

getCurrentLockMode

public LockMode getCurrentLockMode(Object object)
            throws HibernateException
Determine the current lock mode of the given object.
Parameters:
object - a persistent instance
Returns:
the current lock mode

getEnabledFilter

public Filter getEnabledFilter(String filterName)
Retrieve a currently enabled filter by name.
Parameters:
filterName - The name of the filter to be retrieved.
Returns:
The Filter instance representing the enabled fiter.

getEntityMode

public EntityMode getEntityMode()
Retrieve the entity mode in effect for this session.
Returns:
The entity mode for this session.

getEntityName

public String getEntityName(Object object)
            throws HibernateException
Return the entity name for a persistent entity
Parameters:
object - a persistent entity
Returns:
the entity name

getFlushMode

public FlushMode getFlushMode()
Get the current flush mode for this session.
Returns:
The flush mode

getIdentifier

public Serializable getIdentifier(Object object)
            throws HibernateException
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.
Parameters:
object - a persistent instance
Returns:
the identifier

getNamedQuery

public Query getNamedQuery(String queryName)
            throws HibernateException
Obtain an instance of Query for a named query string defined in the mapping file.
Parameters:
queryName - the name of a query defined externally
Returns:
Query

getSession

public Session getSession(EntityMode entityMode)
Starts a new Session with the given entity mode in effect. This secondary Session inherits the connection, transaction, and other context information from the primary Session. It doesn't need to be flushed or closed by the developer.
Parameters:
entityMode - The entity mode to use for the new session.
Returns:
The new session

getSessionFactory

public SessionFactory getSessionFactory()
Get the session factory which created this session.
Returns:
The session factory.

getStatistics

public SessionStatistics getStatistics()
Get the statistics for this session.

getTransaction

public Transaction getTransaction()
Get the Transaction instance associated with this session. The class of the returned Transaction object is determined by the property hibernate.transaction_factory.
Returns:
a Transaction instance
See Also:
Transaction

isConnected

public boolean isConnected()
Check if the session is currently connected.
Returns:
boolean

isDirty

public boolean isDirty()
            throws HibernateException
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?
Returns:
True if the session contains pending changes; false otherwise.
Throws:
HibernateException - could not perform dirtying checking

isOpen

public boolean isOpen()
Check if the session is still open.
Returns:
boolean

load

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.

You should not use this method to determine if an instance exists (use get() instead). Use this only to retrieve an instance that you assume exists, where non-existence would be an actual error.
Parameters:
theClass - a persistent class
id - a valid identifier of an existing persistent instance of the class
Returns:
the persistent instance or proxy

load

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.
Parameters:
theClass - a persistent class
id - a valid identifier of an existing persistent instance of the class
lockMode - the lock level
Returns:
the persistent instance or proxy

load

public void load(Object object,
                 Serializable id)
            throws HibernateException
Read the persistent state associated with the given identifier into the given transient instance.
Parameters:
object - an "empty" instance of the persistent class
id - a valid identifier of an existing persistent instance of the class

load

public Object load(String entityName,
                   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.

You should not use this method to determine if an instance exists (use get() instead). Use this only to retrieve an instance that you assume exists, where non-existence would be an actual error.
Parameters:
entityName - a persistent class
id - a valid identifier of an existing persistent instance of the class
Returns:
the persistent instance or proxy

load

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.
Parameters:
entityName - a persistent class
id - a valid identifier of an existing persistent instance of the class
lockMode - the lock level
Returns:
the persistent instance or proxy

lock

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 (LockMode.READ), to upgrade to a pessimistic lock (LockMode.UPGRADE), or to simply reassociate a transient instance with a session (LockMode.NONE). This operation cascades to associated instances if the association is mapped with cascade="lock".
Parameters:
object - a persistent or transient instance
lockMode - the lock level

lock

public void lock(String entityName,
                 Object object,
                 LockMode lockMode)
            throws HibernateException
Obtain the specified lock level upon the given object. This may be used to perform a version check (LockMode.READ), to upgrade to a pessimistic lock (LockMode.UPGRADE), or to simply reassociate a transient instance with a session (LockMode.NONE). This operation cascades to associated instances if the association is mapped with cascade="lock".
Parameters:
object - a persistent or transient instance
lockMode - the lock level

merge

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 cascade="merge".

The semantics of this method are defined by JSR-220.
Parameters:
object - a detached instance with state to be copied
Returns:
an updated persistent instance

merge

public Object merge(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 cascade="merge".

The semantics of this method are defined by JSR-220.
Parameters:
object - a detached instance with state to be copied
Returns:
an updated persistent instance

persist

public void persist(Object object)
            throws HibernateException
Make a transient instance persistent. This operation cascades to associated instances if the association is mapped with cascade="persist".

The semantics of this method are defined by JSR-220.
Parameters:
object - a transient instance to be made persistent

persist

public void persist(String entityName,
                    Object object)
            throws HibernateException
Make a transient instance persistent. This operation cascades to associated instances if the association is mapped with cascade="persist".

The semantics of this method are defined by JSR-220.
Parameters:
object - a transient instance to be made persistent

reconnect

public void reconnect()
            throws HibernateException

Deprecated. Manual reconnection is only needed in the case of application-supplied connections, in which case the reconnect(java.sql.Connection) for should be used.

Obtain a new JDBC connection. This is used by applications which require long transactions and do not supply connections to the session.
See Also:
disconnect()

reconnect

public void reconnect(Connection connection)
            throws HibernateException
Reconnect to the given JDBC connection. This is used by applications which require long transactions and use application-supplied connections.
Parameters:
connection - a JDBC connection
See Also:
disconnect()

refresh

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
  • where a database trigger alters the object state upon insert or update
  • after executing direct SQL (eg. a mass update) in the same session
  • after inserting a Blob or Clob
Parameters:
object - a persistent or detached instance

refresh

public void refresh(Object object,
                    LockMode lockMode)
            throws HibernateException
Re-read the state of the given instance from the underlying database, with the given LockMode. 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.
Parameters:
object - a persistent or detached instance
lockMode - the lock mode to use

replicate

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 cascade="replicate".
Parameters:
object - a detached instance of a persistent class

replicate

public void replicate(String entityName,
                      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 cascade="replicate".
Parameters:
object - a detached instance of a persistent class

save

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 assigned generator is used.) This operation cascades to associated instances if the association is mapped with cascade="save-update".
Parameters:
object - a transient instance of a persistent class
Returns:
the generated identifier

save

public Serializable save(String entityName,
                         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 assigned generator is used.) This operation cascades to associated instances if the association is mapped with cascade="save-update".
Parameters:
object - a transient instance of a persistent class
Returns:
the generated identifier

saveOrUpdate

public void saveOrUpdate(Object object)
            throws HibernateException
Either save(Object) or update(Object) the given instance, depending upon resolution of the unsaved-value checks (see the manual for discussion of unsaved-value checking).

This operation cascades to associated instances if the association is mapped with cascade="save-update".

Parameters:
object - a transient or detached instance containing new or updated state
See Also:
Session.save(java.lang.Object), Session.update(Object object)

saveOrUpdate

public void saveOrUpdate(String entityName,
                         Object object)
            throws HibernateException
Either save(String,Object) or update(String,Object) the given instance, depending upon resolution of the unsaved-value checks (see the manual for discussion of unsaved-value checking).

This operation cascades to associated instances if the association is mapped with cascade="save-update".

Parameters:
object - a transient or detached instance containing new or updated state

setCacheMode

public void setCacheMode(CacheMode cacheMode)
Set the cache mode.

Cache mode determines the manner in which this session can interact with the second level cache.

Parameters:
cacheMode - The new cache mode.

setFlushMode

public void setFlushMode(FlushMode flushMode)
Set the flush mode for this session.

The flush mode determines the points at which the session is flushed. Flushing is the process of synchronizing the underlying persistent store with persistable state held in memory.

For a logically "read only" session, it is reasonable to set the session's flush mode to FlushMode.MANUAL at the start of the session (in order to achieve some extra performance).

Parameters:
flushMode - the new flush mode
See Also:
FlushMode

setReadOnly

public void setReadOnly(Object entity,
                        boolean readOnly)
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 and the instance is never dirty checked.

update

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 cascade="save-update".
Parameters:
object - a detached instance containing updated state

update

public void update(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 cascade="save-update".
Parameters:
object - a detached instance containing updated state