Hibernate中的@Entity注解

1.新建一个java project项目，里面新建一个lib文件夹，lib文件夹里面放置要用的一些jar文件，然后全部选中导入到项目中去。整体的框架如下图所示：

2.Students.java里面的代码如下图所示：

package entity;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity(name = "t_students")
public class Students {

	private int sid;
	private String sname;
	private String gender;
	private Date birthday;
	private String major;
	private String address;

	public Students() {

	}

	public Students(int sid, String sname, String gender, Date birthday,
			String major, String address) {
		this.sid = sid;
		this.sname = sname;
		this.gender = gender;
		this.birthday = birthday;
		this.major = major;
		this.address = address;
	}

	@Id
	public int getSid() {
		return sid;
	}

	public void setSid(int sid) {
		this.sid = sid;
	}

	public String getSname() {
		return sname;
	}

	public void setSname(String sname) {
		this.sname = sname;
	}

	public String getGender() {
		return gender;
	}

	public void setGender(String gender) {
		this.gender = gender;
	}

	public Date getBirthday() {
		return birthday;
	}

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

	public String getMajor() {
		return major;
	}

	public void setMajor(String major) {
		this.major = major;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

}

3.hibernate.cfg.xml里面的代码如下图所示：

<?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="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="connection.url">jdbc:mysql://localhost:3306/hibernate?characterEncoding=utf-8</property>
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<property name="connection.username">root</property>
		<property name="connection.password">root</property>
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		<property name="hbm2ddl.auto">create</property>
		<property name="hibernate.current_session_context_clss">thread</property>

		<mapping class="entity.Students" />
	</session-factory>
</hibernate-configuration>

4.TestStudents.java里面的代码如下图所示：

package entity;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.Test;

public class TestStudents {

	@Test
	public void testShemaExport() {
		Configuration config = new Configuration().configure();
		ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
				.applySettings(config.getProperties()).buildServiceRegistry();
		SessionFactory sessionFactory = config
				.buildSessionFactory(serviceRegistry);
		SchemaExport export = new SchemaExport(config);
		export.create(true, true);
	}

}

5.在Navicat数据库里面新建一个数据库，数据库的名称要与上面 的数据库的名称相同。

6.运行testShemaExport类，数据库里面会自动创建一张表。