hibernate入門之添加和查詢

1.hibernate.cfg.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>
	     
		 <property name="show_sql">true</property>
		 <property name="format_sql">true</property> 
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 
		<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
		 <property name="connection.username">root</property> 
		 <property name="connection.password">7654321</property> 
		<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> 
       <mapping resource="hibernatedemo/Student.hbm.xml" />
	</session-factory>
</hibernate-configuration>

2.工具類

package hibernatedemo;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class Util {

	static Session getSession(){
		
		Configuration cfg = new Configuration();
		//讀取配置文件
		cfg.configure();
		//得到session
		Session session = cfg.buildSessionFactory().openSession();
		return session;		
	}
}

3.實體類

package hibernatedemo;

import java.sql.Date;

public class Student {
	private Integer id;
	private String name;
	private Date birthday;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

}

4.Student.hbm.xml配置文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
	"-//Hibernate/Hibernate Mapping DTD//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
	 
	 <hibernate-mapping>
	    <class name="hibernatedemo.Student" table="student">
	       <id name="id" column="id" type="java.lang.Integer">    
	          <generator class="native"></generator>
	       </id>
	       <property name="name" type="java.lang.String">
	          <column name="name"></column>
	       </property>
	       <property name="birthday" type="java.sql.Date">
	          <column name="birthday"></column>
	       </property>
	    </class>	      
	 </hibernate-mapping>

5.實現類

package hibernatedemo;

import java.sql.Date;
import java.util.ArrayList;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

public class HibernateAdd {
	Session session = null;//會話session
	Transaction transaction = null;//事務
	public void add(Student stu){
		//開啓會話
		session = Util.getSession();
		transaction=session.beginTransaction();
		try {
			//開啓事務
			transaction.begin();
			//插入數據
			session.save(stu);	
			//提交事務
			transaction.commit();
		} catch (HibernateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			//關閉連接
			session.close();
		}
	}
	
	public List<Student> findAll(){
		List<Student> list = new ArrayList<Student>();
		session = Util.getSession();
		transaction=session.beginTransaction();
		try {
			//開啓事務
			transaction.begin();
			//定義sql語句
			String sql ="from Student";
			Query query = session.createQuery(sql);
			//將數據封裝到list中
			list = query.list();
			transaction.commit();			
		} catch (Exception e) {
			// TODO: handle exception
		}finally{
			session.close();
		}
		return list;
	}

}

6.結構圖