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struts2RestJpaBootstrap - dao
package org.demo.vo.dao;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import org.apache.commons.lang3.StringUtils;
import org.demo.util.GenericJpaDao;
import org.demo.vo.bean.Book;
public class JpaBookDAO extends GenericJpaDao<Book, Integer> {
private final static Predicate[] ap = {};
/**
* Constructs a DAO for Book
*/
public JpaBookDAO() {
super(Book.class);
}
/**
* Search by book example
*/
public List<Book> search(Book book) {
final EntityManager em = getEntityManager();
if ( book != null ) {
CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder();
CriteriaQuery<Book> criteriaQuery = criteriaBuilder.createQuery(Book.class);
Root<Book> from = criteriaQuery.from(Book.class);
List<Predicate> listP = new ArrayList<Predicate>();
if (StringUtils.isNotBlank(book.getIsbn())) {
Predicate predicate = criteriaBuilder.equal(from.get("isbn"), book.getIsbn());
listP.add(predicate);
}
if (StringUtils.isNotBlank(book.getTitle())) {
Predicate predicate = criteriaBuilder.equal(from.get("title"), book.getTitle());
listP.add(predicate);
}
if (book.getId() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("id"), book.getId());
listP.add(predicate);
}
if (book.getPublisherId() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("publisherId"), book.getPublisherId());
listP.add(predicate);
}
if (book.getAuthorId() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("authorId"), book.getAuthorId());
listP.add(predicate);
}
if (book.getPrice() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("price"), book.getPrice());
listP.add(predicate);
}
if (book.getQuantity() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("quantity"), book.getQuantity());
listP.add(predicate);
}
if (book.getDiscount() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("discount"), book.getDiscount());
listP.add(predicate);
}
if (book.getAvailability() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("availability"), book.getAvailability());
listP.add(predicate);
}
if (book.getBestSeller() != null) {
Predicate predicate = criteriaBuilder.equal(from.get("bestSeller"), book.getBestSeller());
listP.add(predicate);
}
criteriaQuery.where(listP.toArray(ap));
TypedQuery<Book> tq = em.createQuery(criteriaQuery);
return tq.getResultList();
}
else
{
return this.loadAll();
}
}
}
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