hibernate的criterion.Restrictions条件查询例子
Hibernate的条件查询主要通过Criteria类、Criterion、Restrictions来完成，作用是：Criteria:执行一次查询。Criterion:设置一个条件查询。Restrictions:产生条件查询的工具类。。
下面例子是通过criterion.Restrictions进行条件查询，取得ajava的ID为1,3,5,7的用户名。
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package org.ajava.example.hibernate.criteria;import org.hibernate.SessionFactory;import org.hibernate.Session;import org.hibernate.HibernateException;import org.hibernate.Criteria;import org.hibernate.criterion.Restrictions;import org.hibernate.cfg.AnnotationConfiguration;import org.ajava.example.hibernate.model.Genre;import java.util.List;public class RestrictionInDemo {    private static final SessionFactory sessionFactory;    static {        try {            sessionFactory = new AnnotationConfiguration().                    configure("hibernate.cfg.xml").                    buildSessionFactory();        }        catch (Throwable ex) {            throw new ExceptionInInitializerError(ex);        }    }    public static Session getSession() throws HibernateException {        return sessionFactory.openSession();    }    @SuppressWarnings("unchecked")    public static void main(String[] args) {        final Session session = getSession();        try {            Criteria criteria = session.createCriteria(Genre.class)                    .add(Restrictions.in("id", new Long[] {1, 3, 5, 7}));            List<Genre> result = criteria.list();            for (Genre genre : result) {                System.out.println("Ajava user:"+genre.getId() + "; " + genre.getName());            }        } finally {            session.close();        }    }}