一、建立hibernate配置文件
在工程Hibernate_01_HelloWorld下的src上建立hibernate.cfg.xml，打开hibernate-release-4.3.11.Final/documentation/manual/en-US/html_single/index.html(hibernate开发文档)，在文档中搜索configuration，找到 hibernate.cfg.xml配置文件的模板，复制到自己的工程中；
1.修改配置文件适用jdbc和mysql数据库
<?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://localhost:3306/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property> <!-- JDBC connection pool (use the built-in) -->
<!-- <property name="connection.pool_size">1</property> --> <!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Enable Hibernate's automatic session context management -->
<!-- <property name="current_session_context_class">thread</property> --> <!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</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="com/model/Student.hbm.xml"/> </session-factory> </hibernate-configuration>
1. Database connection settings， 数据库连接的配置；
2. SQL dialect， hibernate的方言选择，支持多种数据库语言，因我用的是MySQL数据库，所有适用 MySQLDialect，其他可以从文档里查；
3. Echo all executed SQL to stdout， 是否显示sql语句；
4. Drop and re-create the database schema on startup， hibernate启动时删除或者创建数据库结构的策略；
5.Orm， pojo映射配置文件；
二、建立实体类
在src目录下建立实体类包com.model，并创建实体类Student.java
public class Student {
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;
}
}
建立student映射文件与student.java同意路径，Student.hbm.xml(建议从hibernate文档中查找)
<?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="org.hibernate.tutorial.domain">
[...]
</hibernate-mapping>
修改Student.hbm.xml，适用student.java类与数据库student表的映射；
<?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"> <!-- 设置到对应实体类所在的路径 -->
<hibernate-mapping package="com.model">
<!-- name对应实体类的名字 -->
<class name="Student">
<!-- 属性id为设置主键，name的值对应实体类里id属性 -->
<id name="id"></id>
<!-- 其他字段的映射 -->
<property name="name"></property>
<property name="age"></property>
</class>
</hibernate-mapping>
二、在Mysql数据库中创建student表
CREATE TABLE `student` (
`id` int(11) NOT NULL,
`name` varchar(255) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
三、建立hibernate辅助类
根据hibernate官方文档，最好适用hibernate util辅助类，在src目录下新建com.util包，并在下面建立HibernateUtil.java类(博主学习的时候，这个版本的文档里的util类有错误，下面的代码已经改正)
package com.util; import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration; public class HibernateUtil { private static final SessionFactory sessionFactory = buildSessionFactory(); private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
return new Configuration().configure().buildSessionFactory( new StandardServiceRegistryBuilder().applySettings(new Configuration().configure().getProperties()).build());
}
catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
} public static SessionFactory getSessionFactory() {
return sessionFactory;
} }
四、编写测试类
建立测试类Main，代码如下：
import org.hibernate.Session;
import org.hibernate.SessionFactory; import com.model.Student;
import com.util.HibernateUtil; public class Main {
public static void main(String[] args) {
//设置要插入的数据
Student s = new Student();
s.setId(1);
s.setName("233");
s.setAge(100);
//通过util类创建sessionFactory
SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();
//开启事务
session.beginTransaction();
//将student存入数据库
session.save(s);
session.getTransaction().commit();
//关闭资源
session.close();
sessionFactory.close();
}
}
结果：
项目结构：
----------------------------------------------------------------------------------------------------
此文为个人学习记录，如有参考转载，请注明出处 黑白熊的博客 http://www.cnblogs.com/xiong233/