Java tutorial
/** * Abiquo community edition * cloud management application for hybrid clouds * Copyright (C) 2008-2010 - Abiquo Holdings S.L. * * This application is free software; you can redistribute it and/or * modify it under the terms of the GNU LESSER GENERAL PUBLIC * LICENSE as published by the Free Software Foundation under * version 3 of the License * * This software 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 v.3 for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ package com.abiquo.abiserver.persistence; import java.io.Serializable; import java.util.List; import org.apache.cxf.common.util.StringUtils; import org.hibernate.Query; import org.hibernate.Session; public class SessionUtils { public static void saveAndFlush(Session session, Object... entities) { assert session != null; assert entities != null; for (Object entity : entities) { assert entity != null; session.save(entity); } session.flush(); } @SuppressWarnings("unchecked") public static <T> T uniqueResult(Session session, Class<T> cls, String queryString, Object... params) { assert cls != null; return (T) uniqueResult(session, queryString, params); } public static Object uniqueResult(Session session, String queryString, Object... params) { assert session != null; assert !StringUtils.isEmpty(queryString); assert params != null; Query query = createQueryWithParameters(session, queryString, params); return query.uniqueResult(); } public static List<?> list(Session session, String queryString, Object... params) { assert session != null; assert !StringUtils.isEmpty(queryString); assert params != null; Query query = createQueryWithParameters(session, queryString, params); return query.list(); } @SuppressWarnings("unchecked") public static <T> List<T> list(Session session, Class<T> cls, String queryString, Object... params) { assert cls != null; return (List<T>) list(session, queryString, params); } private static Query createQueryWithParameters(Session session, String queryString, Object... params) { Query query = session.createQuery(queryString); for (int i = 0; i < params.length; i++) { Object param = params[i]; assert param != null; query.setParameter(i, param); } return query; } public static <T> boolean entityExists(Session session, Class<T> cls, Serializable id) { assert session != null; assert cls != null; assert id != null; return session.get(cls, id) != null; } }