Hibernate 插入,修改,删除,查询语句

/*  
*具体操作hibernate的类  
*增加,删除,修改,按ID查询,模糊查询,查询全部  
**/ 
public class PersonOperate {  
//在hibernate中所有操作都是由Session完成  
public Session session = null;  
 
//在构造方法中实例化Session对象  
public PersonOperate(){  
    //找出hibernate的配置  
    Configuration config = new Configuration().configure();  
    //从配置中取出SessionFactory  
    SessionFactory sf = config.buildSessionFactory();  
    //从SessionFactory中取出Session  
    this.session = sf.openSession();  
}  
 
//操作Hibernate类的所有操作都是通过Session完成的  
 
//增加数据库中数据  
public void insert(Person person){  
    //开始事务  
    Transaction tran =    session.beginTransaction();  
    //执行语句  
    session.save(person);  
    //提交事务  
    tran.commit();  
    session.close();   
}  
 
//操作Hibernate类更改数据库中的数据  
public void update(Person person){  
    //开始事务  
    Transaction tran =    session.beginTransaction();  
    //执行语句  
    session.update(person);  
    //提交事务  
    tran.commit();   
}  
 
/*操作Hibernate类：按ID查询  
    *我们插入,修改都是对对象进行操作  
    *那么我们查询的时候也应该是返回一个对象  
    **/ 
public Person queryById(String id){  
    System.out.println(id);  
    Person person = null;  
    //hibernate查询语句  
    String hql = "FROM Person as p WHERE p.id = ?";  
    Query q = session.createQuery(hql);  
    q.setString(0, id);  
    List list = q.list();  
    Iterator iteator = list.iterator();  
    if(iteator.hasNext()){  
     person = (Person)iteator.next();  
    }  
    return person;  
}  
 
/*操作Hibernate类：删除数据库中数据  
    *hiberante2,hibernate3中通用的删除方法  
    *缺点:删除数据之前要先查询一次数据,找出删除的数据对象  
    *性能低下  
    **/ 
public void delete(Person person){  
    //开始事务  
    Transaction tran =    session.beginTransaction();  
    //执行语句  
    session.delete(person);  
    //提交事务  
    tran.commit();   
}  
 
//hibernate3的用法  
public void delete(String id){  
    //开始事务  
    Transaction tran =    session.beginTransaction();  
    String hql = "DELETE Person WHERE id = ?";  
 
    Query q = session.createQuery(hql);  
    q.setString(0, id);  
    //执行更新语句  
    q.executeUpdate();  
    //提交事务  
    tran.commit();  
}  
 
//操作Hibernate类：查询全部数据  
public List queryAll(){  
    List list = null;  
    String hql = "FROM Person as p ";  
    Query q = session.createQuery(hql);  
    list = q.list();  
    return list;  
}  
 
//操作Hibernate类：模糊查询  
public List queryByLike(String colnum,String value){  
    List list = null;  
    String hql = "FROM Person as p WHERE p."+ colnum +" like ?";  
    Query q = session.createQuery(hql);  
    q.setString(0, "%"+ value +"%");  
    list = q.list();  

Criteria criteria = session.createCriteria(Customer.class);
Criterion c1 = Expression.like("name", "T%");
Criterion c2 = Exception.eq("age", new Long(21));
criteria.add(c1);
criteria.add(c2);
List list = criteria.list();
以上语句相当于：
    List list = session..createCriteria(Customer.class)
                .add(Expression.like("name", "T%"))
                .add(Exception.eq("age", new Long(21)))
                .list();
                
查询
List <User> user = session.createCriteria(User.class) 
                        //必需创建一个别名，roles为user中包 含的role 的list. 
                        .createAlias("roles","roles") 
                        //roleId为传进来进行查询的角色ID 
                        .add(Restrictions.eq("roles.id",roleId)) 
                        .list();