Hibernate基本开发步骤

1.新建一个Web Project ，导入相应jar文件

2.编写Util类

package com.mingmei.util;

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class CreateTable {
public static void main(String[] args) {
Configuration configuration = new Configuration().configure();
SchemaExport schemaExport = new SchemaExport(configuration);
schemaExport.create(true, true);
}
}

package com.mingmei.util;

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

public class HibernateSessionFactory {
// 1. 读取hibernate.cfg.xml文件
static Configuration configuration = new Configuration().configure();

public static Session getSession() {
// 2. 创建SessionFactory对象
SessionFactory sessionFactory = configuration.buildSessionFactory();
// 3.获取Session对象
return sessionFactory.openSession();
}

public static void closeSession(Session session) {
if (session.isOpen()) {
session.close();
}
}
}

4.编写实体类

package com.tarena.pojo;

import java.io.Serializable;

public class User implements Serializable {
private int id;
private String name;
private String pwd;
private int age;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

}

5. 配置User.hbm.xml

<?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 package="com.tarena.pojo">
<class name="User" table="d_user">
<id name="id" type="integer">
<generator class="native"></generator>
</id>
<property name="name" ></property>
<property name="pwd"></property>
<property name="age"></property>
</class>
</hibernate-mapping>

6. 配置核心配置文件hibernate.cfg.xml

<!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="connection.username">root</property>
<property name="connection.password">root</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/hibernate
</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="myeclipse.connection.profile">hibernate</property>
<mapping resource="com/tarena/pojo/User.hbm.xml" />
</session-factory>
</hibernate-configuration>

7.编写测试类TestHibernate.java

package com.tarena.test;

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

import com.tarena.pojo.User;
import com.tarena.util.HibernateSessionFactory;

public class TestHibernate {
@Test
public void testSave() {
Session session = HibernateSessionFactory.getSession();
Transaction transaction = session.beginTransaction();
transaction.begin();
try {
User user = new User();
user.setAge(23);
user.setName("maxiaoming");
user.setPwd("1234");
session.save(user);
transaction.commit();
} catch (Exception e) {
e.printStackTrace();
transaction.rollback();
} finally {
HibernateSessionFactory.closeSession(session);
}

}

@Test
public void testLoad() {
Session session = null;
try {
session = HibernateSessionFactory.getSession();
User user = (User) session.load(User.class, 2); // ObjectNotFoundException
System.out.println(user.getId() + "," + user.getName() + ","
+ user.getPwd() + "," + user.getAge());
} catch (Exception e) {
e.printStackTrace();
} finally {
HibernateSessionFactory.closeSession(session);
}

}

@Test
public void testGet() {
Session session = null;
try {
session = HibernateSessionFactory.getSession();
User user = (User) session.get(User.class, 1);
System.out.println(user);
// System.out.println(user.getId() + "," + user.getName() + ","
// + user.getPwd() + "," + user.getAge());
} catch (Exception e) {
e.printStackTrace();
} finally {
HibernateSessionFactory.closeSession(session);
}

}

@Test
public void testUpdate() {
// 执行修改之前须调用load/get方法
Session session = null;
try {
session = HibernateSessionFactory.getSession();
session.beginTransaction().begin();
User user = (User) session.load(User.class, 1);

user.setName("maxianhai");
user.setPwd("test");
session.update(user);
session.beginTransaction().commit();

} catch (Exception e) {
e.printStackTrace();
session.beginTransaction().rollback();
} finally {
HibernateSessionFactory.closeSession(session);
}
}

@Test
public void testDelete() {
Session session = null;
try {

session = HibernateSessionFactory.getSession();
session.beginTransaction().begin();
User user = new User();
user.setId(2);
session.delete(user);
session.beginTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
session.beginTransaction().rollback();
} finally {
HibernateSessionFactory.closeSession(session);
}

}
}