Hibernate基础实例

2019-01-15 07:03:34来源：博客园阅读 ()

hibernate是orm(对象关系映射)框架即通过配置文件使对象与数据库表关联

让eclipse断网拥有xml提示功能

①解压hibernate-core-5.0.7.Final.jar

②进入org\hibernate下复制到单独文件
//此处演示配置单个其余配置同理
hibernate-configuration-3.0.dtd
hibernate-configuration-4.0.xsd
hibernate-mapping-3.0.dtd
hibernate-mapping-4.0.xsd

③打开hibernate-mapping-3.0.dtd 复制xml文档类型标记里的uri
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

hibernate的所有配置文件模板都在 hibernate-release-5.0.7.Final\project\etc

ehcache.xml
hibernate-service.xml
hibernate.cfg.xml
hibernate.properties
hibernate.properties.template
log4j.properties

hibernate实例

①导入hibernate包

//导入hibernate必选包&数据库连接包
antlr-2.7.7.jar
dom4j-1.6.1.jar
geronimo-jta_1.1_spec-1.1.1.jar
hibernate-commons-annotations-5.0.1.Final.jar
hibernate-core-5.0.7.Final.jar
hibernate-jpa-2.1-api-1.0.0.Final.jar
jandex-2.0.0.Final.jar
javassist-3.18.1-GA.jar
jboss-logging-3.3.0.Final.jar

mysql-connector-java-5.1.7-bin.jar

②创建customer表

CREATE TABLE `customer` (
`id` bigint(32) NOT NULL AUTO_INCREMENT COMMENT '客户编号(主键)',
`name` varchar(32) NOT NULL COMMENT '客户名称(公司名称)',
`source` varchar(32) DEFAULT NULL COMMENT '客户信息来源',
`industry` varchar(32) DEFAULT NULL COMMENT '客户所属行业',
`level` varchar(32) DEFAULT NULL COMMENT '客户级别',
`linkman` varchar(64) DEFAULT NULL COMMENT '联系人',
`phone` varchar(64) DEFAULT NULL COMMENT '固定电话',
`mobile` varchar(16) DEFAULT NULL COMMENT '移动电话',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

③创建实体类Customer

//创建实体类与customer表对应类名=表名字属性名=表字段名
public class Customer {
private Long id;
private String name;
private String source;
private String industry;
private String level;
private String linkman;
private String phone;
private String mobile;
//getter setter
//框架调用无参构造方法实例对象构造方法没有重载时可默认不写jvm会补充
}

④创建对象与表映射文件Customer.hbm.xml 和实体类放置同包

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">


<hibernate-mapping package="com.java.entity" >

<class name="Customer" table="customer" >

<id name="id" >

<generator class="native"></generator>
</id>

<property name="name" column="name" >

</property>
<property name="source" column="source" ></property>
<property name="industry" column="industry" ></property>
<property name="level" column="level" ></property>
<property name="linkman" column="linkman" ></property>
<property name="phone" column="phone" ></property>
<property name="mobile" column="mobile" ></property>
</class>
</hibernate-mapping>

⑤创建hibernate主配置文件路径在src下名字为hibernate.cfg.xml(默认配置)

<?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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

<property name="hibernate.connection.url">jdbc:mysql:///test</property>

<property name="hibernate.connection.username">root</property>

<property name="hibernate.connection.password">root</property>

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

<property name="hibernate.show_sql">true</property>

<property name="hibernate.format_sql">true</property>

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

<mapping resource="com/java/entity/Customer.hbm.xml" />

</session-factory>
</hibernate-configuration>

测试框架实例

public class Test {
public static void main(String[] args) {
Configuration configuration= new Configuration().configure();
SessionFactory sessionFactory = configuration.buildSessionFactory();
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
Customer customer = new Customer();
customer.setName("TestName");
session.save(c);//执行保存
transaction.commit();
session.close();
sessionFactory.close();
}
}

select * from customer;

+----+----------+--------+----------+-------+---------+-------+--------+
| id | name | source | industry | level | linkman | phone | mobile |
+----+----------+--------+----------+-------+---------+-------+--------+
| 1 | TestName | NULL | NULL | NULL | NULL | NULL | NULL |
+----+----------+--------+----------+-------+---------+-------+--------+

hibernate常用api

public class Test {
public static void main(String[] args) {
// 创建框架配置对象
Configuration configuration = new Configuration();

// 读取指定主配置文件空参加载方法默认加载src下的hibernate.cfg.xml文件
configuration.configure();

// 读取指定类映射xml文件如主配置中已引入映射配置不需要手动加载
// configuration.addResource(resourceName);
// configuration.addClass(persistentClass);

// 根据配置信息创建SessionFactory对象此类线程安全串行运行建议只有一个实例
SessionFactory sessionFactory = configuration.buildSessionFactory();

// 获得session对象
Session session = sessionFactory.openSession();

// 只获得操作事务的Transaction对象
// Transaction transaction = session.getTransaction();
// 获得Transaction对象并开启事务(建议使用)
Transaction transaction = session.beginTransaction();

/*
* 根据Customer的id去查询用户 1l代表Customer的id类型为long值为1
* Customer customer = session.get(Customer.class, 1l);
* System.out.println(customer);
*/

/*
* 增加单个用户
* Customer customer = new Customer();
* customer.setName("User");
* 执行save
* session.save(customer);
*/

/*
* 获得要修改的对象
* Customer customer = session.get(Customer.class, 1l);
* 修改成功后的数据
* customer.setName("Test");
* 执行update
* session.update(customer);
*/

/*
* 获得要删除的对象
* Customer customer = session.get(Customer.class, 1l);
* 执行delete
* session.delete(customer);
*/

//transaction.rollback();// 回滚事务
transaction.commit();// 提交事务
session.close();// 释放资源
sessionFactory.close();// 释放资源
}
}

hibernate工具类

public class HibernateUtils {
private static SessionFactory sessionFactory;

static{
// 默认加载src下的hibernate.cfg.xml创建hibernate配置对象
Configuration configuration= new Configuration().configure();
// 根据配置信息创建SessionFactory对象
sessionFactory = configuration.buildSessionFactory();
}

//获得session对象
public static Session openSession(){
// 获得session
Session session = sessionFactory.openSession();
return session;
}
}

原文链接:https://www.cnblogs.com/setlilei/p/10264910.html
如有疑问请与原作者联系

标签：

版权申明：本站文章部分自网络，如有侵权，请联系：west999com@outlook.com
特别注意：本站所有转载文章言论不代表本站观点，本站所提供的摄影照片，插画，设计作品，如需使用，请与原作者联系，版权归原作者所有