新新一个java项目,并新建javabean。如下:
TUser.java
package cn.ehoo.bean; /** *@author whp *@Email whp@ehoo.cn *@Nov 8, 2011 * */ public class TUser { private Long id; private String name; private Integer age; private Group group; public Group getGroup() { return group; } public void setGroup(Group group) { this.group = group; } public Long getId() { return id; } public void setId(Long 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; } }
Group.java
package cn.ehoo.bean; /** *@author whp *@Email whp@ehoo.cn *@Nov 8, 2011 * */ public class Group { private Long id; private String groupName; public Group(String groupName) { super(); this.groupName = groupName; } public Group() { } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getGroupName() { return groupName; } public void setGroupName(String groupName) { this.groupName = groupName; } }
2 TUser与Group类的配置文件
TUser.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> <class name="cn.ehoo.bean.TUser" table="t_user" > <id name="id" type="long"> <generator class="native" /> </id> <property name="name" /> <property name="age"/> <many-to-one name="group" class="cn.ehoo.bean.Group" unique="true" column="group_id"/> </class> </hibernate-mapping>
Group.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> <class name="cn.ehoo.bean.Group" table="group1"><!--这里不能把table名字命名为group,如果是group的话会出错--> <id name="id" type="long" column="group_id"> <generator class="native" /> </id> <property name="groupName"/> </class> </hibernate-mapping>
3、hibernate.cfg.xml 文件的配置
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/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/test?useUnicode=true&characterEncoding=UTF-8</property> <property name="connection.username">root</property> <property name="connection.password">123</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.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <property name="format_sql">true</property> <property name="hbm2ddl.auto">update</property> <mapping resource="cn/ehoo/bean/TUser.hbm.xml" /> <mapping resource="cn/ehoo/bean/Group.hbm.xml" /> </session-factory> </hibernate-configuration>
4、hibernate Util类
package en.choo.util; import java.io.Serializable; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; public final class HibernateUtil { private static SessionFactory sessionFactory; private static ThreadLocal session = new ThreadLocal(); private HibernateUtil() { } static { try { Configuration cfg = new Configuration(); cfg.configure(); sessionFactory = cfg.buildSessionFactory(); } catch (Exception e) { e.printStackTrace(); // TODO: handle exception } } public static Session getThreadLocalSession() { Session s = (Session) session.get(); if (s == null) { s = getSession(); session.set(s); } return s; } public static void closeSession() { Session s = (Session) session.get(); if (s != null) { s.close(); session.set(null); } } public static SessionFactory getSessionFactory() { return sessionFactory; } public static Session getSession() { return sessionFactory.openSession(); } public static void add(Object entity) { Session s = null; Transaction tx = null; try { s = HibernateUtil.getSession(); tx = s.beginTransaction(); s.save(entity); tx.commit(); } finally { if (s != null) s.close(); } } public static void update(Object entity) { Session s = null; Transaction tx = null; try { s = HibernateUtil.getSession(); tx = s.beginTransaction(); s.update(entity); tx.commit(); } finally { if (s != null) s.close(); } } public static void delete(Object entity) { Session s = null; Transaction tx = null; try { s = HibernateUtil.getSession(); tx = s.beginTransaction(); s.delete(entity); tx.commit(); } finally { if (s != null) s.close(); } } public static Object get(Class clazz, Serializable id) { Session s = null; try { s = HibernateUtil.getSession(); Object obj = s.get(clazz, id); return obj; } finally { if (s != null) s.close(); } } public static void main(String[] args) { Session session = null; session = getSession(); System.out.println(session); } }
5、hibernate相应的测试类
package cn.ehoo.test; import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.AfterClass; import org.junit.BeforeClass; import org.junit.Test; import cn.ehoo.bean.Group; import cn.ehoo.bean.TUser; import en.choo.util.HibernateUtil; /** * @author whp * @Email whp@ehoo.cn * @Nov 8, 2011 * */ public class TUserTest { static Session session = null; static Transaction tr = null; @BeforeClass public static void setUpBeforeClass() throws Exception { session = HibernateUtil.getSession(); tr = session.beginTransaction(); } @AfterClass public static void tearDownAfterClass() throws Exception { tr.commit(); } @Test public static void saveUser() { TUser user = new TUser(); user.setAge(12); user.setName("Wang Haipeng"); Group group = new Group("系统权限"); user.setGroup(group); HibernateUtil.add(group); HibernateUtil.add(user); } public static void main(String[] args) { saveUser(); } }