hibernate之基本操作(增，删，改，查)

编写配置文件 hibernate-cfg.xml

<?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>

<!-- 方言 -->

<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

<!-- 数据库连接 -->

<property name="connection.url">jdbc:mysql://localhost:3306/db_database14</property>

<!-- 数据库连接用户名 -->

<property name="connection.username">root</property>

<!-- 数据库连接密码 -->

<property name="connection.password">admin</property>

<!-- 数据库驱动 -->

<property name="connection.driver_class">com.mysql.jdbc.Driver</property>

<!-- 打印SQL语句 -->

<property name="show_sql">true</property>

<property name="format_sql">true</property>

<!-- 映射文件 -->

<mapping resource="com/java0806/Medicine.hbm.xml" />

</session-factory>

</hibernate-configuration>

2 编写工具类 hibernateUtil.java

package com.java0806.util;

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

/**

* Hibernate初始化类，用于获取Session、SessionFactory 及关闭Session

* @author Li Yong Qiang

*/

public class HibernateUtil {

// SessionFactory对象

private static SessionFactory factory = null;

// 静态块

static {

try {

// 加载Hibernate配置文件

Configuration cfg = new Configuration().configure();

// 实例化SessionFactory

factory = cfg.buildSessionFactory();

} catch (HibernateException e) {

e.printStackTrace();

}

}

/**

* 获取Session对象

* @return Session对象

*/

public static Session getSession() {

//如果SessionFacroty不为空，则开启Session

Session session = (factory != null) ? factory.openSession() : null;

return session;

}

/**

* 获取SessionFactory对象

* @return SessionFactory对象

*/

public static SessionFactory getSessionFactory() {

return factory;

}

/**

* 关闭Session

* @param session对象

*/

public static void closeSession(Session session) {

if (session != null) {

if (session.isOpen()) {

session.close(); // 关闭Session

}

}

}

}

3 编写实体类

package com.java0806;

/**

* 药品持久化类

* @author Li Yong Qiang

*/

public class Medicine {

private Integer id; //id号

private String name; //药品名称

private double price; //价格

private String factoryAdd; //出厂地址

private String Description; //描述

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

public String getFactoryAdd() {

return factoryAdd;

}

public void setFactoryAdd(String factoryAdd) {

this.factoryAdd = factoryAdd;

}

public String getDescription() {

return Description;

}

public void setDescription(String description) {

Description = description;

}

}

4编写映射文件

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC

"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="com.lyq.model.Medicine" table="tb_medicine_select_get">

<id name="id">

<generator class="native"/>

</id>

<property name="name" not-null="true" length="200" />

<property name="price" not-null="true"/>

<property name="factoryAdd" length="200"/>

<property name="description" />

</class>

</hibernate-mapping>

5编写测试类

package com.lyq.util;

import org.hibernate.Session;

import com.lyq.model.Medicine;

/**

* 增，删，改，查

* @author Li Yong Qiang

*/

public class Update {

public static void main(String[] args) {

Session session = null; //声明Session对象

try {

//获取Session

session = HibernateUtil.getSession();

//开启事物

session.beginTransaction();

/*

// 删除

Medicine medicine=(Medicine) session.load(Medicine.class,new Integer(1));

session.delete(medicine);*/

/*//添加数据

//实例化药品对象，并对其属性赋值

Medicine medicine = new Medicine();

medicine.setId(2);

medicine.setName("xxx感冒药");

medicine.setPrice(102.00);

medicine.setFactoryAdd("制药一厂xxx");

medicine.setDescription("最新感冒药");

//保存药品对象

session.save(medicine);*/

/*

//两种查询方式

Medicine medicine = (Medicine)session.get(Medicine.class, new Integer(1));

Medicine medicine =(Medicine)session.load(Medicine.class,new Integer(1));

System.out.println("药品ID：" + medicine.getId());

System.out.println("药品名称：" + medicine.getName());*/

//自动修改

/*Medicine medicine = (Medicine)session.get(Medicine.class, new Integer(1));

medicine.setName("感冒胶囊"); //修改药品名称

medicine.setPrice(10.05);*/

//手动修改

/*Medicine medicine = new Medicine();

medicine.setId(1);

medicine.setName("感冒药xx");

medicine.setPrice(12.00);

medicine.setFactoryAdd("制药一厂");

medicine.setDescription("最新感冒药");

session.update(medicine);*/

//提交事物

session.getTransaction().commit();

} catch (Exception e) {

e.printStackTrace();

//出错将回滚事物

session.getTransaction().rollback();

}finally{

//关闭Session对象

HibernateUtil.closeSession(session);

}

}

}