| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.ambari.server.orm.dao; |
| |
| import com.google.inject.Singleton; |
| |
| import javax.persistence.NoResultException; |
| import javax.persistence.Query; |
| import javax.persistence.TypedQuery; |
| import java.util.Collections; |
| import java.util.List; |
| |
| @Singleton |
| public class DaoUtils { |
| |
| public <T> List<T> selectList(TypedQuery<T> query, Object... parameters) { |
| setParameters(query, parameters); |
| try { |
| return query.getResultList(); |
| } catch (NoResultException ignored) { |
| return Collections.emptyList(); |
| } |
| } |
| |
| public <T> T selectSingle(TypedQuery<T> query, Object... parameters) { |
| setParameters(query, parameters); |
| try { |
| return query.getSingleResult(); |
| } catch (NoResultException ignored) { |
| return null; |
| } |
| } |
| |
| public int executeUpdate(Query query, Object... parameters) { |
| setParameters(query, parameters); |
| return query.executeUpdate(); |
| } |
| |
| public void setParameters(Query query, Object... parameters) { |
| for (int i = 0; i < parameters.length; i++) { |
| query.setParameter(i+1, parameters[i]); |
| } |
| } |
| } |