org.hibernate.query

Interface CommonQueryContract

All Known Subinterfaces:

HqlQueryImplementor<R>, NativeQuery<T>, NativeQueryImplementor<R>, ProcedureCall, ProcedureCallImplementor<R>, Query<R>, QueryImplementor<R>

All Known Implementing Classes:

AbstractQuery

public interface CommonQueryContract

Defines the aspects of query definition that apply to all forms of querying (HQL, JPQL, criteria) across all forms of persistence contexts (Session, StatelessSession, EntityManager).

Method Summary

Modifier and Type	Method and Description
CacheMode	getCacheMode() Obtain the CacheMode in effect for this query.
String	getCacheRegion() Obtain the name of the second level query cache region in which query results will be stored (if they are cached, see the discussion on isCacheable() for more information).
Integer	getFetchSize() Obtain the JDBC fetch size hint in effect for this query.
FlushMode	getHibernateFlushMode() Obtain the FlushMode in effect for this query.
Integer	getTimeout() Obtain the query timeout in seconds.
boolean	isCacheable() Are the results of this query eligible for second level query caching? This is different that second level caching of any returned entities and collections, which is controlled by getCacheMode().
boolean	isReadOnly() Should entities and proxies loaded by this Query be put in read-only mode? If the read-only/modifiable setting was not initialized, then the default read-only/modifiable setting for the persistence context is returned instead.
CommonQueryContract	setCacheable(boolean cacheable) Enable/disable second level query (result) caching for this query.
CommonQueryContract	setCacheMode(CacheMode cacheMode) (Re)set the current CacheMode in effect for this query.
CommonQueryContract	setCacheRegion(String cacheRegion) Set the name of the cache region where query results should be cached (if cached at all).
CommonQueryContract	setFetchSize(int fetchSize) Sets a JDBC fetch size hint for the query.
CommonQueryContract	setHibernateFlushMode(FlushMode flushMode) (Re)set the current FlushMode in effect for this query.
CommonQueryContract	setReadOnly(boolean readOnly) Set the read-only/modifiable mode for entities and proxies loaded by this Query.
CommonQueryContract	setTimeout(int timeout) Set the query timeout in seconds.

Method Detail

getHibernateFlushMode

FlushMode getHibernateFlushMode()

Obtain the FlushMode in effect for this query. By default, the query inherits the FlushMode of the Session from which it originates.

Returns:

The query FlushMode.

See Also:

Session.getHibernateFlushMode(), FlushMode

setHibernateFlushMode

CommonQueryContract setHibernateFlushMode(FlushMode flushMode)

(Re)set the current FlushMode in effect for this query.

Parameters:

flushMode - The new FlushMode to use.

Returns:

this, for method chaining

See Also:

Session.getHibernateFlushMode(), getHibernateFlushMode()

getCacheMode

CacheMode getCacheMode()

Obtain the CacheMode in effect for this query. By default, the query inherits the CacheMode of the Session from which is originates.

NOTE: The CacheMode here describes reading-from/writing-to the entity/collection caches as we process query results. For caching of the actual (unparsed) query results, see isCacheable() and getCacheRegion()

In order for this setting to have any affect, second-level caching would have to be enabled and the entities/collections in question configured for caching.

Returns:

The query CacheMode.

See Also:

Session.getCacheMode(), CacheMode

setCacheMode

CommonQueryContract setCacheMode(CacheMode cacheMode)

(Re)set the current CacheMode in effect for this query.

Parameters:

cacheMode - The new CacheMode to use.

Returns:

this, for method chaining

See Also:

getCacheMode()

isCacheable

boolean isCacheable()

Are the results of this query eligible for second level query caching?

This is different that second level caching of any returned entities and collections, which is controlled by getCacheMode().

NOTE: the query being "eligible" for caching does not necessarily mean its results will be cached. Second level query caching still has to be enabled on the SessionFactory for this to happen. Usually that is controlled by the hibernate.cache.use_query_cache configuration setting.

Returns:

true if the query results are eligible for caching, false otherwise.

See Also:

AvailableSettings.USE_QUERY_CACHE

setCacheable

CommonQueryContract setCacheable(boolean cacheable)

Enable/disable second level query (result) caching for this query.

Parameters:

cacheable - Should the query results be cacheable?

Returns:

this, for method chaining

See Also:

isCacheable()

getCacheRegion

String getCacheRegion()

Obtain the name of the second level query cache region in which query results will be stored (if they are cached, see the discussion on isCacheable() for more information). null indicates that the default region should be used.

Returns:

The specified cache region name into which query results should be placed; null indicates the default region.

setCacheRegion

CommonQueryContract setCacheRegion(String cacheRegion)

Set the name of the cache region where query results should be cached (if cached at all).

Parameters:

cacheRegion - the name of a query cache region, or null to indicate that the default region should be used.

Returns:

this, for method chaining

See Also:

getCacheRegion()

getTimeout

Integer getTimeout()

Obtain the query timeout in seconds. This value is eventually passed along to the JDBC query via Statement.setQueryTimeout(int). Zero indicates no timeout.

Returns:

The timeout in seconds

See Also:

Statement.getQueryTimeout(), Statement.setQueryTimeout(int)

setTimeout

CommonQueryContract setTimeout(int timeout)

Set the query timeout in seconds. NOTE it is important to understand that any value set here is eventually passed directly through to the JDBC Statement which expressly disallows negative values. So negative values should be avoided as a general rule.

Parameters:

timeout - the timeout in seconds

Returns:

this, for method chaining

See Also:

getTimeout()

getFetchSize

Integer getFetchSize()

Obtain the JDBC fetch size hint in effect for this query. This value is eventually passed along to the JDBC query via Statement.setFetchSize(int). As defined b y JDBC, this value is a hint to the driver to indicate how many rows to fetch from the database when more rows are needed. NOTE : JDBC expressly defines this value as a hint. It may or may not have any effect on the actual query execution and ResultSet processing depending on the driver.

Returns:

The timeout in seconds

See Also:

Statement.getFetchSize(), Statement.setFetchSize(int)

setFetchSize

CommonQueryContract setFetchSize(int fetchSize)

Sets a JDBC fetch size hint for the query.

Parameters:

fetchSize - the fetch size hint

Returns:

this, for method chaining

See Also:

getFetchSize()

isReadOnly

boolean isReadOnly()

Should entities and proxies loaded by this Query be put in read-only mode? If the read-only/modifiable setting was not initialized, then the default read-only/modifiable setting for the persistence context is returned instead.

Returns:

true if the entities and proxies loaded by the query will be put in read-only mode; false otherwise (they will be modifiable)

See Also:

setReadOnly(boolean), The read-only/modifiable setting has no impact on entities/proxies returned by the query that existed in the session beforeQuery the query was executed.

setReadOnly

CommonQueryContract setReadOnly(boolean readOnly)

Set the read-only/modifiable mode for entities and proxies loaded by this Query. This setting overrides the default setting for the persistence context.

Parameters:

readOnly - true indicates that entities and proxies loaded by the query are to be put in read-only mode; false indicates that entities and proxies loaded by the query will be put in modifiable mode

Returns:

this, for method chaining

See Also:

To set the default read-only/modifiable setting used for entities and proxies that are loaded into the session:, PersistenceContext.setDefaultReadOnly(boolean), 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. The read-only/modifiable setting has no impact on entities/proxies returned by the query that existed in the session beforeQuery the query was executed.