hibernate学习笔记之demo

最新推荐文章于 2021-10-26 21:30:57 发布

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本文介绍了一个使用Hibernate框架实现的简单POJO对象到数据库表的映射示例，包括配置文件设置、对象定义及测试代码。

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POJO对象：

public class Person {
public Integer id;
public String name;
public Date birthday;
public int password;

public Person(){}

public Person(String name, Date birthday, int password) {
super();
this.name = name;
this.birthday = birthday;
this.password = password;
}

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 Date getBirthday() {
return birthday;
}

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

public int getPassword() {
return password;
}

public void setPassword(int password) {
this.password = password;
}

@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", birthday=" + birthday
+ ", password=" + password + "]";
}
}

对象与表映射文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping SYSTEM "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd" >

<hibernate-mapping>
<class name="helloworld.Person" table="t_person">
<id name="id">
<generator class="native"></generator>
</id>
<property name="name"></property>
<property name="password"></property>
<property name="birthday"></property>
</class>

</hibernate-mapping>

hibernate配置文件，放在根目录下：

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql:///hibernate_db</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">199151</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.show_sql">true</property>
<property name="bibernate.format_sql">true</property>
<mapping resource="helloworld\Person.hbm.xml"/>
</session-factory>
</hibernate-configuration>

注意：此处没有配置dialect属性，根据MySQL的版本而定，我用的为最新版本的MySQL，如果配置了dialect属性，自动创建表失败，如果是老版本的额MySQL，则必须有dialect属性。

测试test类：

package hibernateTest;

import helloworld.Person;

import java.util.Date;

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

public class HIbernateTest {
public static void main(String []args){
Configuration config = new Configuration().configure();
SessionFactory factory = config.buildSessionFactory();
Session session = factory.openSession();
Transaction tx = session.beginTransaction();
Person p = new Person("admin",new Date(),123456);
session.save(p);
tx.commit();
session.close();
factory.close();

}
}