对 Hibernate 初体验
1．新建一个java工程，工程名为Hiberante1
2．导入相应的jar包
1）hibernate需要导入这些包
2）因为我们需要操作数据库所以要导入数据库的包，我用的mysql数据库
3．创建数据库以及表
create database hibernate ;
use hibernate;
create table Student(
id int(32) primary key auto_increment ,
name varchar(32) ,
age int(10)
)engine=innoDB default charset=gbk;
4．创建hibernate配置文件（文件名为hibernate.cfg.xml，一般我们将其放在根目录下面）
<?xml version='1.0' encoding='utf-8'?>
<!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>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://127.0.0.1/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">1234</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
<mapping resource="cc./tukai/entity/Student.hbm.xml" />
</session-factory>
</hibernate-configuration>
5．创建实体类
package cc.tukai.entity;
import java.io.Serializable;
public class Student implements Serializable {
private int id;
private String name;
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
6．创建映射文件（文件名为Student.hbm.xml,一般我们将其方法和实体类同一目录下面）
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cc.tukai.entity">
<class name="Student" table="student">
<id name="id" column="id">
<generator class="native"></generator>
</id>
<property name="name" type="java.lang.String">
<column name="name" length="32"></column>
</property>
<property name="age" type="java.lang.Integer">
<column name="age" length="10"></column>
</property>
</class>
</hibernate-mapping>
7．测试添加数据到数据库
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.junit.Test;
import cc.tukai.entity.Student;
public class testHibernate {
@Test
public void testSave() {
Student student = new Student();
student.setAge(12);
student.setName("name");
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Session session = factory.openSession();
session.beginTransaction();
session.save(student);
session.getTransaction().commit();
session.close();
factory.close();
}
}
但运行上面的测试类之后，我们查看一下数据库中student表，表中将会多一条数据。
Hibernate的初体验就说到这，相信通过上面的例子，我们对hibernate大致有了一些了解了。
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2011-06-17
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