com.rambird.repository.springdatajpa.JpaOwnerRepositoryImpl.java Source code

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Here is the source code for com.rambird.repository.springdatajpa.JpaOwnerRepositoryImpl.java

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/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed 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 com.rambird.repository.springdatajpa;

import java.util.Collection;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import org.springframework.stereotype.Repository;

import com.rambird.miles.model.Owner;
import com.rambird.miles.repository.OwnerRepository;

/**
 * Using native JPA instead of Spring Data JPA here because of this query: "SELECT owner FROM Owner owner left join
 * fetch owner.pets WHERE owner.lastName LIKE :lastName" See https://jira.springsource.org/browse/DATAJPA-292 for more
 * details.
 *
 * @author Michael Isvy
 */
@Repository
public class JpaOwnerRepositoryImpl implements OwnerRepository {

    @PersistenceContext
    private EntityManager em;

    @Override
    @SuppressWarnings("unchecked")
    public Collection<Owner> findByLastName(String lastName) {
        // using 'join fetch' because a single query should load both owners and pets
        // using 'left join fetch' because it might happen that an owner does not have pets yet
        Query query = this.em.createQuery(
                "SELECT DISTINCT owner FROM Owner owner left join fetch owner.pets WHERE upper(owner.lastName) LIKE upper(:lastName)");
        query.setParameter("lastName", lastName + "%");
        return query.getResultList();
    }

    @Override
    public Owner findById(int id) {
        // using 'join fetch' because a single query should load both owners and pets
        // using 'left join fetch' because it might happen that an owner does not have pets yet
        Query query = this.em
                .createQuery("SELECT owner FROM Owner owner left join fetch owner.pets WHERE owner.id =:id");
        query.setParameter("id", id);
        return (Owner) query.getSingleResult();
    }

    @Override
    public void save(Owner owner) {
        this.em.merge(owner);

    }

}