| 1 | /* |
| 2 | * Copyright 2006-2008 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.springframework.batch.item.database.orm; |
| 18 | |
| 19 | import org.hibernate.Query; |
| 20 | import org.hibernate.SQLQuery; |
| 21 | import org.springframework.util.Assert; |
| 22 | import org.springframework.util.StringUtils; |
| 23 | |
| 24 | /** |
| 25 | * <p> |
| 26 | * This query provider creates Hibernate {@link Query}s from injected native SQL |
| 27 | * queries. This is useful if there is a need to utilize database-specific |
| 28 | * features such as query hints, the CONNECT keyword in Oracle, etc. |
| 29 | * </p> |
| 30 | * |
| 31 | * @author Anatoly Polinsky |
| 32 | * |
| 33 | * @param <E> entity returned by executing the query |
| 34 | */ |
| 35 | public class HibernateNativeQueryProvider<E> extends AbstractHibernateQueryProvider { |
| 36 | |
| 37 | private String sqlQuery; |
| 38 | |
| 39 | private Class<E> entityClass; |
| 40 | |
| 41 | /** |
| 42 | * <p> |
| 43 | * Create an {@link SQLQuery} from the session provided (preferring |
| 44 | * stateless if both are available). |
| 45 | * </p> |
| 46 | */ |
| 47 | @Override |
| 48 | public SQLQuery createQuery() { |
| 49 | |
| 50 | if (isStatelessSession()) { |
| 51 | return getStatelessSession().createSQLQuery(sqlQuery).addEntity(entityClass); |
| 52 | } |
| 53 | else { |
| 54 | return getStatefulSession().createSQLQuery(sqlQuery).addEntity(entityClass); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | public void setSqlQuery(String sqlQuery) { |
| 59 | this.sqlQuery = sqlQuery; |
| 60 | } |
| 61 | |
| 62 | public void setEntityClass(Class<E> entityClazz) { |
| 63 | this.entityClass = entityClazz; |
| 64 | } |
| 65 | |
| 66 | public void afterPropertiesSet() throws Exception { |
| 67 | Assert.isTrue(StringUtils.hasText(sqlQuery), "Native SQL query cannot be empty"); |
| 68 | Assert.notNull(entityClass, "Entity class cannot be NULL"); |
| 69 | } |
| 70 | } |