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.
 *這是用來測試分頁查詢的類。
 */
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();
        /**對應的兩個方法setFirstResult設定從哪一個物件開始檢索，預設情況下從0開始
         * setMaxResults設定一次對多檢索出來的物件的數目**/
        Iterator iterator=zzy.iterator();
        while(iterator.hasNext())
            System.out.println(iterator.next());
    }
}

/**
 * Created by Administrator on 2015/12/15.
 * 這是一個用來測試繫結引數的測試類，繫結引數的方式用？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
 * 這是一個用來測試繫結引數的類，這裡用的是：引數的放來來繫結引數.
 */
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.
 * 這個類用來使用HQL語句來查詢所有的物件。
 */
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.
 * 這是一個可以根據降序和升序排序的HQL查詢語句
 */
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());
    }
}