Hibernate_HQL

public class According_condition {
    public static void main(String[]args){
        Session session=HibernateUtil.getSession();
        List<Book2> zzy=new ArrayList<>();
        String HQL="from  Book2 bo where bo.bookCount=2000";
        Query W=session.createQuery(HQL);
        zzy=W.list();
        Iterator iterator=zzy.iterator();
        while(iterator.hasNext())
            System.out.println(iterator.next());
    }
}

/**
 * Created by Administrator on 2015/12/16.
 *这是用来测试分页查询的类。
 */
public class Page_query {
    public static void main(String[]args){
        Session session= HibernateUtil.getSession();
        List<Book2> zzy=new ArrayList<>();
        String HQL="from  Book2 bo";
        Query W=session.createQuery(HQL);
        int pageNo=3;
        int pageSize=4;
        zzy=W.setFirstResult(0).setMaxResults(pageSize).list();
        /**对应的两个方法setFirstResult设定从哪一个对象开始检索，默认情况下从0开始
         * setMaxResults设定一次对多检索出来的对象的数目**/
        Iterator iterator=zzy.iterator();
        while(iterator.hasNext())
            System.out.println(iterator.next());
    }
}

/**
 * Created by Administrator on 2015/12/15.
 * 这是一个用来测试绑定参数的测试类，绑定参数的方式用？的方式
 */
public class parameter_binding_HQL {
    public static void main(String[]args) {
        Session session = HibernateUtil.getSession();
        List<Book2> zzy=new ArrayList<>();
        String HQL="from  Book2 bo where bo.bookCount=?";
        Query query=session.createQuery(HQL);
        query.setParameter(0,2000);
        zzy=query.list();
        Iterator iterator=zzy.iterator();
        while(iterator.hasNext())
            System.out.println(iterator.next());
    }
}

/**
 * Created by Administrator on 2015/12/15
 * 这是一个用来测试绑定参数的类，这里用的是：参数的放来来绑定参数.
 */
public class parameter_binding_HQL_new {
    public static void main(String[]args) {
        Session session = HibernateUtil.getSession();
        List<Book2> zzy=new ArrayList<>();
        String HQL="from  Book2 bo where bo.bookCount=:count";
        Query query=session.createQuery(HQL);
        query.setParameter("count",1222);
        zzy=query.list();
        Iterator iterator=zzy.iterator();
        while(iterator.hasNext())
            System.out.println(iterator.next());
    }
}

/**
 * Created by Administrator on 2015/12/15.
 * 这个类用来使用HQL语句来查询所有的对象。
 */
public class select_all {
    public static void main(String[]args){
        Session session= HibernateUtil.getSession();
        List<Book2> zzy=new ArrayList<Book2>();
        String HQL="from Book2 bo";
        Query W=session.createQuery(HQL);
        zzy=W.list();
        Iterator iterator=zzy.iterator();
        while(iterator.hasNext())
            System.out.println(iterator.next());
    }
}

/**
 * Created by Administrator on 2015/12/15.
 * 这是一个可以根据降序和升序排序的HQL查询语句
 */
public class sort_query {
    public static void main(String[]args){
        Session session= HibernateUtil.getSession();
        List<Book2> zzy=new ArrayList<Book2>();
        String HQL="from  Book2 bo order by bo.id desc";
        //desc是降序，asc是升序
        Query W=session.createQuery(HQL);
        zzy=W.list();
        Iterator iterator=zzy.iterator();
        while(iterator.hasNext())
            System.out.println(iterator.next());
    }
}