HibernateUtil:

package hibernate.util;

import java.io.Serializable;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

import com.zxf.model.Student;

public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    public static SessionFactory buildSessionFactory() {
    	if(sessionFactory != null) {
    		return sessionFactory;
    	} else {
            try {
                return new AnnotationConfiguration().configure().buildSessionFactory();
            }
            catch (Throwable ex) {
                System.err.println("Initial SessionFactory creation failed." + ex);
                throw new ExceptionInInitializerError(ex);
            }
    	}
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
    
    public static void add(Object o) {
    	Session session = null;
    	try {
    		session = sessionFactory.openSession();
    		session.beginTransaction();
    		session.save(o);
    		session.getTransaction().commit();
    	} catch (HibernateException e) {
    		e.printStackTrace();
    	} finally {
    		session.close();
    	}
    }
    
    public static void update(Object o) {
    	Session session = null;
    	try {
    		session = sessionFactory.openSession();
    		session.beginTransaction();
    		session.update(o);
    		session.getTransaction().commit();
    	} catch (HibernateException e) {
    		e.printStackTrace();
    	} finally {
    		session.close();
    	}
    }
    
    public static void delete(Object o) {
    	Session session = null;
    	try {
    		session = sessionFactory.openSession();
    		session.beginTransaction();
    		session.delete(o);
    		session.getTransaction().commit();
    	} catch (HibernateException e) {
    		e.printStackTrace();
    	} finally {
    		session.close();
    	}
    }
    
    public static Object get(Class className,Serializable id) {
    	Session session = null;
    	Object o = null;
    	try {
    		session = sessionFactory.openSession();
    		o = session.get(className, id);
    	} catch (HibernateException e) {
    		e.printStackTrace();
    		return null;
    	} finally {
    		if(session != null) {
        		session.close();
    		}
    	}
    	return o;
    }
}
 

HQL:

import hibernate.util.HibernateUtil;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.junit.Test;

import com.zxf.model.Student;

public class HQLTest {

	@Test
	public void query01() {
		Query query = null;
		Session session = null;
		List<Student> students = null;
		String hql = "from Student as user where user.name=?";
		
		session = HibernateUtil.buildSessionFactory().openSession();
		query = session.createQuery(hql);
		query.setString(0, "teeny");
		students = query.list();//query.uniqueResult();唯一記錄
		
		for(Student s:students) {
			System.out.println(s.getName() + "----" + s.getAge());
		}
	}
}
 

Critera:

//Critera查詢
	@Test
	public void query04() {
		Criteria cri = null;
		Session session = null;
		List<Student> students = null;
		
		try {
			session = HibernateUtil.buildSessionFactory().openSession();
			cri = session.createCriteria(Student.class);
			cri.add(Restrictions.eq("name", "jason"));//新增對於Student物件的約束條件
			cri.add(Restrictions.eq("age",20));
			students = cri.list();//cri.uniqueResult();唯一記錄
			
			for(Student s:students) {
				System.out.println(s.getName() + "----" + s.getAge());
			}
		} catch (HibernateException e) {
			e.printStackTrace();
		} finally {
			if(session != null) {
				session.close();
			}
		}
	}
 

物件名與關鍵字衝突：

<hibernate-mapping package="com.zxf.model">

    <class name="Student" table="Student">
        <id name="id"></id>
        <property name="name"/>
        <property name="age"/>
    </class>

</hibernate-mapping>

table名衝突，比如User在sqlserver和oracle裡面都是關鍵字，可以指定配置中table屬性重新指定一個table，或者是用``將表名括起來，這樣資料庫就不會把它當關鍵字對待，而是看做普通字串，如下：

<hibernate-mapping package="com.zxf.model">

    <class name="Student" table="`Student`">
        <id name="id"></id>
        <property name="name" column="`name`"/>
        <property name="age"/>
    </class>

</hibernate-mapping>