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Hibernate's core ORM functionality
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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 .
 */
package org.hibernate;

import java.io.Closeable;
import java.io.Serializable;
import java.sql.Connection;

import org.hibernate.query.NativeQuery;

/**
 * A command-oriented API for performing bulk operations against a database.
 * 
 * A stateless session does not implement a first-level cache nor interact
 * with any second-level cache, nor does it implement transactional
 * write-behind or automatic dirty checking, nor do operations cascade to
 * associated instances. Collections are ignored by a stateless session.
 * Operations performed via a stateless session bypass Hibernate's event model
 * and interceptors.  Stateless sessions are vulnerable to data aliasing
 * effects, due to the lack of a first-level cache.
 * 
 * For certain kinds of transactions, a stateless session may perform slightly
 * faster than a stateful session.
 *
 * @author Gavin King
 */
public interface StatelessSession extends SharedSessionContract, AutoCloseable, Closeable {
	/**
	 * Close the stateless session and release the JDBC connection.
	 */
	void close();

	/**
	 * Insert a row.
	 *
	 * @param entity a new transient instance
	 *
	 * @return The identifier of the inserted entity
	 */
	Serializable insert(Object entity);

	/**
	 * Insert a row.
	 *
	 * @param entityName The entityName for the entity to be inserted
	 * @param entity a new transient instance
	 *
	 * @return the identifier of the instance
	 */
	Serializable insert(String entityName, Object entity);

	/**
	 * Update a row.
	 *
	 * @param entity a detached entity instance
	 */
	void update(Object entity);

	/**
	 * Update a row.
	 *
	 * @param entityName The entityName for the entity to be updated
	 * @param entity a detached entity instance
	 */
	void update(String entityName, Object entity);

	/**
	 * Delete a row.
	 *
	 * @param entity a detached entity instance
	 */
	void delete(Object entity);

	/**
	 * Delete a row.
	 *
	 * @param entityName The entityName for the entity to be deleted
	 * @param entity a detached entity instance
	 */
	void delete(String entityName, Object entity);

	/**
	 * Retrieve a row.
	 *
	 * @param entityName The name of the entity to retrieve
	 * @param id The id of the entity to retrieve
	 *
	 * @return a detached entity instance
	 */
	Object get(String entityName, Serializable id);

	/**
	 * Retrieve a row.
	 *
	 * @param entityClass The class of the entity to retrieve
	 * @param id The id of the entity to retrieve
	 *
	 * @return a detached entity instance
	 */
	Object get(Class entityClass, Serializable id);

	/**
	 * Retrieve a row, obtaining the specified lock mode.
	 *
	 * @param entityName The name of the entity to retrieve
	 * @param id The id of the entity to retrieve
	 * @param lockMode The lock mode to apply to the entity
	 *
	 * @return a detached entity instance
	 */
	Object get(String entityName, Serializable id, LockMode lockMode);

	/**
	 * Retrieve a row, obtaining the specified lock mode.
	 *
	 * @param entityClass The class of the entity to retrieve
	 * @param id The id of the entity to retrieve
	 * @param lockMode The lock mode to apply to the entity
	 *
	 * @return a detached entity instance
	 */
	Object get(Class entityClass, Serializable id, LockMode lockMode);

	/**
	 * Refresh the entity instance state from the database.
	 *
	 * @param entity The entity to be refreshed.
	 */
	void refresh(Object entity);

	/**
	 * Refresh the entity instance state from the database.
	 *
	 * @param entityName The entityName for the entity to be refreshed.
	 * @param entity The entity to be refreshed.
	 */
	void refresh(String entityName, Object entity);

	/**
	 * Refresh the entity instance state from the database.
	 *
	 * @param entity The entity to be refreshed.
	 * @param lockMode The LockMode to be applied.
	 */
	void refresh(Object entity, LockMode lockMode);

	/**
	 * Refresh the entity instance state from the database.
	 *
	 * @param entityName The entityName for the entity to be refreshed.
	 * @param entity The entity to be refreshed.
	 * @param lockMode The LockMode to be applied.
	 */
	void refresh(String entityName, Object entity, LockMode lockMode);

	/**
	 * Returns the current JDBC connection associated with this
	 * instance.

	 * 

	 * If the session is using aggressive connection 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.
	 *
	 * @deprecated just missed when deprecating same method from {@link Session}
	 *
	 * @return The connection associated with this stateless session
	 */
	@Deprecated
	Connection connection();

	@Override
	NativeQuery createSQLQuery(String queryString);
}