第一个hibernate应用程序

搭建hibernate环境

将所需jar包单独打包新建一个library之后添加到项目中

使用的数据库为Oracle，需要Oracle数据库驱动的jar文件。如果使用别的数据库，只需选择对象的驱动文件

网盘链接：hibernate需要的jar包

创建实体类

源码

package com.dhee.entity;

/**
* person实体类
*
* @author Inspiron
*
*/
public class Person implements java.io.Serializable {

private static final long serialVersionUID = 1045122557721301152L;
private Integer id;
private String name;
private Integer age;
private String title;

public Person() {

}

public Person(Integer id, String name, Integer age, String title) {
this.title = title;
this.id = id;
this.name = name;
this.age = age;
}

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public Integer getAge() {
return age;
}

public void setAge(Integer age) {
this.age = age;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public static long getSerialversionuid() {
return serialVersionUID;
}

}

创建工具类

获得SessionFactory对象

package com.dhee.utils;

import org.hibernate.SessionFactory;
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();
} 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);
}
}

/**
* 获得sessionFactory对象
*
* @return返回sessionFactory对象
*/
public static SessionFactory getSessionFactory() {
return sessionFactory;
}

}

必要的配置文件

hibernate.cfg.xml文件

<?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 -->
<!-- Oracle数据库加载驱动 -->
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<!-- 连接数据库url -->
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:XE</property>
<!-- 数据库名 -->
<property name="connection.username">system</property>
<!-- 连接数据库的密码 -->
<property name="connection.password">yuanbao</property>

<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>

<!-- SQL dialect -->
<!-- 连接数据库对应的方言 -->
<!-- Oracle 11g         org.hibernate.dialect.Oracle10gDialect -->
<!-- MySQL5     org.hibernate.dialect.MySQL5Dialect -->
<!-- Microsoft SQL Server 2008          org.hibernate.dialect.SQLServer2008Dialect -->
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</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.NoCacheProvider</property>

<!-- 控制台是否打印sql语句 -->
<!-- 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>

<!-- 设置实体类的url，如果使用xml配置文件：使用resource="指向xml配置文件" -->
<!-- 例如：<mapping resource="com/dhee/entity/Person.hbm.xml"/> -->
<!-- 如果使用annotation注释：使用class="实体类的路径" -->
<!--  <mapping class="com.dhee.entity.Preson"/> -->
<mapping resource="com/dhee/entity/Person.hbm.xml"/>

</session-factory>

</hibernate-configuration
>

对应的实体类映射配置文件

Person.hbm.xml

<?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">

<!-- 文件路径 -->
<hibernate-mapping package="com.dhee.entity">
<class name="Person" table="PERSON">
<!-- 对应数据表中的主键 -->
<id name="id">
<generator class="native"/>
</id>
<!-- 如果实体类的成员变量和数据库字段名对应一致的话，可以只写name -->
<property name="name"/>
<property name="age"/>
<property name="title"/>
</class>
</hibernate-mapping>

创建数据表PERSON

CREATE TABLE PERSON(
ID NUMBER(4) PRIMARY KEY,
NAME VARCHAR2(20 CHAR),
AGE NUMBER(4),
TITLE VARCHAR2(20 CHAR);

创建测试代码

package com.dhee.test;

import org.hibernate.classic.Session;

import com.dhee.entity.Person;
import com.dhee.utils.HibernateUtil;

public class PersonTest {

public static void main(String[] args) {
// TODO Auto-generated method stub
Person p = new Person();
Session session = HibernateUtil.getSessionFactory().getCurrentSession();

p.setId(1);
p.setName("tom");
p.setAge(20);
p.setTitle("student");

session.beginTransaction();
session.save(p);
session.getTransaction().commit();

}

}

执行PersonTest类，控制台打印出insert语句，数据添加成功

如果对于实体类不使用xml配置文件，可以使用注解，修改hibernate.cfg.xml文件中mapping标签的class

package com.dhee.entity;

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

/**
* person实体类
*
* @author Inspiron
*
*/
@Entity
public class Person implements java.io.Serializable {

private static final long serialVersionUID = 1045122557721301152L;
private Integer id;
private String name;
private Integer age;
private String title;

public Person() {

}

public Person(Integer id, String name, Integer age, String title) {
this.title = title;
this.id = id;
this.name = name;
this.age = age;
}

@Id //注解表示主键，主键注解写在getXX上面
public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public Integer getAge() {
return age;
}

public void setAge(Integer age) {
this.age = age;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public static long getSerialversionuid() {
return serialVersionUID;
}

}

END