bookstore.dao.generic.GenericDAOImpl.java Source code

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Here is the source code for bookstore.dao.generic.GenericDAOImpl.java

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package bookstore.dao.generic;

import hibernate.HibernateUtil;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;

/**
 *
 * @author Ruben
 */
public abstract class GenericDAOImpl<T, ID extends Serializable> implements GenericDAO<T, ID> {

    protected Session getSession() {
        return HibernateUtil.getSession();
    }

    public void save(T entity) {
        Session hibernateSession = this.getSession();
        hibernateSession.saveOrUpdate(entity);
    }

    public void merge(T entity) {
        Session hibernateSession = this.getSession();
        hibernateSession.merge(entity);
    }

    public void delete(T entity) {
        Session hibernateSession = this.getSession();
        hibernateSession.delete(entity);
    }

    public List<T> findMany(Query query) {
        List<T> t;
        t = (List<T>) query.list();
        return t;
    }

    public T findOne(Query query) {
        T t;
        t = (T) query.uniqueResult();
        return t;
    }

    public T findByID(Class clazz, BigDecimal id) {
        Session hibernateSession = this.getSession();
        T t = null;
        t = (T) hibernateSession.get(clazz, id);
        return t;
    }

    public List findAll(Class clazz) {
        Session hibernateSession = this.getSession();
        List T = null;
        Query query = hibernateSession.createQuery("from " + clazz.getName());
        T = query.list();
        return T;
    }
}