org.hibernate.jpa.HibernateHints Maven / Gradle / Ivy
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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
*/
package org.hibernate.jpa;
/**
* List of Hibernate-specific (extension) hints available to query,
* load, and lock scenarios.
*
* Some hints are only effective in certain scenarios, which is noted
* on each constant's documentation.
*
* @apiNote The stringly-typed hints defined here correspond to
* typesafe operations of Hibernate's native APIs, and
* should not be used unless portability between JPA
* implementations is of very great importance.
*
* @author Steve Ebersole
*/
public interface HibernateHints {
/**
* Hint for specifying the {@link org.hibernate.FlushMode} to
* apply to an {@link jakarta.persistence.EntityManager} or
* {@link jakarta.persistence.Query}.
*
* @see org.hibernate.query.Query#setHibernateFlushMode
* @see org.hibernate.Session#setHibernateFlushMode
*/
String HINT_FLUSH_MODE = "org.hibernate.flushMode";
/**
* Hint for specifying a
* {@linkplain org.hibernate.query.CommonQueryContract#setTimeout
* query timeout}, in seconds.
*
* @see org.hibernate.query.CommonQueryContract#setTimeout
* @see java.sql.Statement#setQueryTimeout
* @see SpecHints#HINT_SPEC_QUERY_TIMEOUT
*/
String HINT_TIMEOUT = "org.hibernate.timeout";
/**
* Hint for specifying that objects loaded into the persistence
* context as a result of a query should be associated with the
* persistence context in
* {@linkplain org.hibernate.query.SelectionQuery#setReadOnly
* read-only mode}.
*
* @see org.hibernate.query.SelectionQuery#setReadOnly
* @see org.hibernate.Session#setDefaultReadOnly
*/
String HINT_READ_ONLY = "org.hibernate.readOnly";
/**
* Hint for specifying a JDBC fetch size to be applied to the
* statement.
*
* @see org.hibernate.query.SelectionQuery#setFetchSize
* @see java.sql.Statement#setFetchSize
*/
String HINT_FETCH_SIZE = "org.hibernate.fetchSize";
/**
* Hint for specifying whether results from a query should be
* stored in the query cache.
*
* @see org.hibernate.query.SelectionQuery#setCacheable
*/
String HINT_CACHEABLE = "org.hibernate.cacheable";
/**
* Hint for specifying the region of the query cache into which
* the results should be stored.
*
* @implSpec No effect unless {@link #HINT_CACHEABLE} is set to {@code true}
*
* @see org.hibernate.query.SelectionQuery#setCacheRegion
*/
String HINT_CACHE_REGION = "org.hibernate.cacheRegion";
/**
* Hint for specifying the {@link org.hibernate.CacheMode} to use.
*
* @implSpec No effect unless {@link #HINT_CACHEABLE} is set to {@code true}
*
* @see org.hibernate.query.SelectionQuery#setCacheMode
*/
String HINT_CACHE_MODE = "org.hibernate.cacheMode";
/**
* Hint for specifying a database comment to be appended to the
* SQL statement sent to the database.
*
* @implSpec Not valid for {@link org.hibernate.procedure.ProcedureCall},
* nor for {@link jakarta.persistence.StoredProcedureQuery}.
*
* @see org.hibernate.query.SelectionQuery#setComment
*/
String HINT_COMMENT = "org.hibernate.comment";
/**
* Hint to enable or disable the follow-on locking mechanism provided
* by {@link org.hibernate.dialect.Dialect#useFollowOnLocking}.
*
* A value of {@code true} enables follow-on-locking, whereas a value
* of {@code false} disables it. If the value is {@code null}, the
* dialect itself will determine whether follow-on locking is used.
*
* @see org.hibernate.LockOptions#setFollowOnLocking(Boolean)
*
* @since 5.2
*/
String HINT_FOLLOW_ON_LOCKING = "hibernate.query.followOnLocking";
/**
* Hint for specifying the lock mode to apply to the results of a
* native query.
*
* Accepts either a {@link jakarta.persistence.LockModeType} or a
* {@link org.hibernate.LockMode}.
*
* @apiNote While Hibernate supports applying a lock mode to a
* native query, the JPA specification requires that
* {@link jakarta.persistence.Query#setLockMode} throw
* an {@link IllegalStateException} in this scenario.
*/
String HINT_NATIVE_LOCK_MODE = "org.hibernate.lockMode";
/**
* Hint for specifying the
* {@linkplain org.hibernate.query.SynchronizeableQuery query spaces}
* that affect the results of a native query.
*
* Passed value can be any of:
*
* - a {@link org.hibernate.mapping.List} of the spaces,
*
- an array of the spaces, or
*
- a string with a whitespace-separated list of the spaces.
*
*
* Typically, these are the names of tables which are referenced by
* the query.
*
* @see org.hibernate.query.SynchronizeableQuery#addSynchronizedQuerySpace
* @see #HINT_FLUSH_MODE
* @see org.hibernate.annotations.NamedNativeQuery#querySpaces
*/
String HINT_NATIVE_SPACES = "org.hibernate.query.native.spaces";
/**
* Whether to treat a {@link org.hibernate.procedure.ProcedureCall}
* or {@link jakarta.persistence.StoredProcedureQuery} as a call
* to a function rather than a call to a procedure.
*/
String HINT_CALLABLE_FUNCTION = "org.hibernate.callableFunction";
/**
* Hint for specifying the tenant id to use when creating an
* {@link jakarta.persistence.EntityManagerFactory#createEntityManager(java.util.Map) EntityManager}.
*
* @see org.hibernate.SessionBuilder#tenantIdentifier
* @see jakarta.persistence.EntityManagerFactory#createEntityManager(java.util.Map)
*/
String HINT_TENANT_ID = "org.hibernate.tenantId";
/**
* Hint to enable a fetch profile for a given
* {@link jakarta.persistence.EntityManager#setProperty(String, Object) EntityManager}.
*
* @see org.hibernate.Session#enableFetchProfile(String)
* @see jakarta.persistence.EntityManager#setProperty(String, Object)
*/
String HINT_FETCH_PROFILE = "org.hibernate.fetchProfile";
/**
* Hint to enable subselect fetching for a given
* {@link jakarta.persistence.EntityManager#setProperty(String, Object) EntityManager}.
*
* @see org.hibernate.cfg.AvailableSettings#USE_SUBSELECT_FETCH
* @see jakarta.persistence.EntityManager#setProperty(String, Object)
*/
String HINT_ENABLE_SUBSELECT_FETCH = "org.hibernate.enableSubselectFetch";
/**
* Hint to set the batch size for batch fetching for a given
* {@link jakarta.persistence.EntityManager#setProperty(String, Object) EntityManager}.
*
* @see org.hibernate.cfg.AvailableSettings#DEFAULT_BATCH_FETCH_SIZE
* @see jakarta.persistence.EntityManager#setProperty(String, Object)
*/
String HINT_BATCH_FETCH_SIZE = "org.hibernate.batchFetchSize";
/**
* Hint to set the batch size for JDBC batching for a given
* {@link jakarta.persistence.EntityManager#setProperty(String, Object) EntityManager}.
*
* @see org.hibernate.cfg.AvailableSettings#STATEMENT_BATCH_SIZE
* @see jakarta.persistence.EntityManager#setProperty(String, Object)
*/
String HINT_JDBC_BATCH_SIZE = "org.hibernate.jdbcBatchSize";
/**
* Hint to enable or disable the query plan caching.
*
* By default, query plan caching is enabled for HQL queries
* and immutable criteria queries i.e. created with {@link org.hibernate.cfg.AvailableSettings#CRITERIA_COPY_TREE}.
* Query plan caching can be disabled for any query by setting this property to {@code false}.
* Query plan caching can be enabled for mutable criteria queries by setting this property to {@code true}.
*
* Setting this property to {@code true} for mutable criteria queries can lead to cache trashing,
* because the query plan is cached based on a copy of the criteria query.
* This is mostly useful when the same {@link org.hibernate.query.Query} should be executed multiple times,
* but with different parameter values to avoid re-translation of the criteria query.
*
* Note that setting this property to {@code true} does not override the basic safety measures of Hibernate.
* Hibernate will never cache query plans that are not safe to cache, regardless of the value of this property.
*
* @see org.hibernate.query.SelectionQuery#setQueryPlanCacheable
*
* @since 6.3
*/
String HINT_QUERY_PLAN_CACHEABLE = "hibernate.query.plan.cacheable";
/**
* Hint for specifying a query hint to be appended to the
* SQL statement sent to the database.
*
* @see org.hibernate.query.spi.MutableQueryOptions#addDatabaseHint(String)
* @see org.hibernate.query.Query#addQueryHint
* @since 6.5
*/
String HINT_QUERY_DATABASE = "hibernate.query.database";
}