Hibernate之——使用SchemaExport类自动创建数据库表

   初步学习Hibernate，对其“使用面向对象的思维操作数据库”理解的越加透彻。

首先入门学习Hibernate的第一步：使用SchemaExport创建数据库表。

一·首先建立实体类：

package com.bjpowernode.hibernate;

import java.util.Date;

public class User1 {

	private int id;

	private String name;
	
	private String password;
	
	private Date createTime;
	
	private Date expireTime;

	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 getPassword() {
		return password;
	}

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

	public Date getCreateTime() {
		return createTime;
	}

	public void setCreateTime(Date createTime) {
		this.createTime = createTime;
	}

	public Date getExpireTime() {
		return expireTime;
	}

	public void setExpireTime(Date expireTime) {
		this.expireTime = expireTime;
	}
}

二·在实体类的基础上，建立对应的映射xml文件：User1.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.bjpowernode.hibernate">
	<class name="User1" table="t_user1">
		<id name="id" column="user_id" length="32">
			<generator class="uuid"/>
		</id>
		<property name="name" length="30" unique="true" not-null="true"/>
		<property name="password"/>
		<property name="createTime" type="date" column="create_time"/>
		<property name="expireTime"/>
	</class>
</hibernate-mapping>

3·在src目录下 添加h ibernate.cfg.xml 配置文件：（该配置文件主要是配置连接数据库的参数）

<!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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_test</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">123456</property>
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
		<property name="hibernate.show_sql">true</property>

		<mapping resource="com/bjpowernode/hibernate/User.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

四·建立ExportDB类：

package com.bjpowernode.hibernate;

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

/**
 * 将hbm生成ddl
 * @author Administrator
 *
 */
public class ExportDB {

	public static void main(String[] args) {
		
		//默认读取hibernate.cfg.xml文件
		Configuration cfg = new Configuration().configure();
		SchemaExport export = new SchemaExport(cfg);
		export.create(true, true);
	}
}

    基础步骤到此结束，首先在MySql创建hibernate_test数据库：

        

       数据库创建成功后，执行ExportDB类的main方法，console对话框显示内容如图所示：

    现在通过命令行查询库里情况：