Hibernate4.3环境配置

1.导入jar包

1.1导入Hibernate相关jar包

此处使用maven来获得jar包，在pom.xml中添加的依赖为

        <dependency>
		<groupId>org.hibernate</groupId>
		<artifactId>hibernate-core</artifactId>
		<version>4.3.6.Final</version>
	</dependency>

 1.2导入数据库连接jar包

此处使用mysql，在pom.xml中添加依赖

	<dependency>
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
	   <version>5.1.31</version>
        </dependency>

2.编写hibernate总配置文件：hibernate.cfg.xml

2.1结构分析

2.1.1dtd信息

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

2.1.2数据库连接信息

         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
         <property name="connection.username">root</property>
         <property name="connection.password">12345</property>

2.1.3方言（也就是使用哪种数据库）

 <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

2.1.4其他配置信息

显示sql：<property name="show_sql">true</property>

格式化sql显示：<property name="hibernate.format_sql">true</property>
事务自动提交：<property name="connection.autocommit">true</property>

通过配置文件生成数据库表：

               <!-- 
			create:先删除表，再创建
			update：如果没有则创建，如果有则更新（适合开发时候使用）
			create-drop：初始化时创建表，SessionFactory执行close（）时删除表
			validate：验证表结构是否一致，如果不一致，就抛异常
		 -->

<property name="hibernate.hbm2ddl.auto">update</property>

2.1.5实体映射文件声明

<mapping resource="cn/com/cpf/pojo/User.hbm.xml"/>

一般和pojo也在同一个包中，所以在此处写路径可以直接复制pojo的qualified name

2.2配置例子

<?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>
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
                <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
                <property name="connection.username">root</property>
                <property name="connection.password">12345</property>
        
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<property name="jdbc.batch_size">20</property>
		<property name="connection.autocommit">true</property>

		<!-- 显示sql语句 -->
		<property name="show_sql">true</property>
		<property name="connection.useUnicode">true</property>
		<property name="connection.characterEncoding">UTF-8</property>

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

一般放在src/main/resources目录下

3.编写实体映射文件*.hbm.xml

作用：就是为了实现实体bean和数据库表之间的映射

<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
                            "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                            "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
	<class name="cn.com.cpf.pojo.User" table="t_user">
    	   <id name="id" column="id">
        	 <generator class="native"/>
	   </id>
	 <property name="name" column="name"/>
        </class>
</hibernate-mapping>

4.编写实体pojo

public class User {
	private int id;
	private String name;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	
}

5.单元测试

<span style="white-space:pre">	</span>@Test
	public void testHibernate()
	{
		Configuration cfg = new Configuration();
		cfg.configure("hibernate.cfg.xml");
		SessionFactory factory = cfg.buildSessionFactory();
		Session session = factory.openSession();
		Transaction tx = session.beginTransaction();
		User user = new User();
		user.setName("vvv");
		session.save(user);
		User u = (User) session.get(User.class, 1);
		System.out.println(u.getName());
		tx.commit();
		session.close();
		
	}

6.hibernate整体作用说明