1.下载hibernate-release-4.2.4.Final.zip 从点击打开链接( http://www.hibernate.org/downloads)下载
2.在eclipse中新建一个java project工程,名为hibernate_first,在hibernate_first中新建一个ilb文件夹,
解压下载的hibernate-release-4.2.4.Final.zip,打开之后有几个文件夹 lib---jar库 documentation--文档说明 projetc---关于hibernate的配置/例子等等之类的
进入到hibernate-release-4.2.4.Finallib equired 目录下 将8个必须的jar包拷贝到 hibernate_firstlib 下面 并且将8个jar包单击右键选中--Build Path--Add to Build Path(即添加为工程引用)
同时将mysql-connector-java-5.1.25-bin.jar 添加lib包下
3.编写配置文件 进入到hibernate-release-4.2.4.Finalprojectetc 目录下 将hibernate.cfg.xml文件拷贝到项目hibernate_firstsrc 目录下
将hibernate.cfg.xml文件修改为如下;
<!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://localhost:3306/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="hbm2ddl.auto">create</property> <property name="hibernate.show_sql">true</property> <mapping resource="com/undergrowth/hibernate/domain/Student.hbm.xml" /> </session-factory> </hibernate-configuration>
简单解释一下上面的hibernate.cfg.xml文件
connection.driver_class/connection.url/connection.username/connection.password 是用于mysql连接的驱动/资源定位符/登陆账号/登陆密码
hibernate.dialect是hibernate用于兼容多种数据库而做的,告诉hibernate使用的是哪一种数据库
hibernate.show_sql是在进行相应的hibernate操作时,会在控制台输出相应的sql语句
hbm2ddl.auto是在hibernate第一次进行操作时 都会自己创建一个表
mapping resource用于指明对象与表的映射关系 这里指的是Student类和学生表的一个映射文件 下面也会介绍到
上面的这些属性其实不用记 在hibernate-release-4.2.4.Finalprojectetchibernate.properties文件中都可以找到
4.编写对象与对象的映射文件 引用上面的配置 建立Student.java类 如下
package com.undergrowth; import java.util.Date; public class Student { private int id; 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 Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public String getMajor() { return major; } public void setMajor(String major) { this.major = major; } private String name; private Date birthday; private String major; public Student(String name, Date birthday, String major) { this.name = name; this.birthday = birthday; this.major = major; } public Student(){} //用于给hibernate的反射使用 @Override public String toString() { return "Student [id=" + id + ", name=" + name + ", birthday=" + birthday + ", major=" + major + "]"; } }
编写Student的ORM映射文件Student.hbm.xml hibernate自带的模板很多 这里引用hibernate-release-4.2.4.Finalprojectdocumentationsrcmaindocbookquickstart utorialsasicsrc estjavaorghibernate utorialhbm 目录下的Event.hbm.xml
Student.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"> <hibernate-mapping package="com.undergrowth"> <class name="Student" table="student"> <id name="id"> <generator class="native"/> </id> <property name="name"/> <property name="birthday"/> <property name="major"/> </class> </hibernate-mapping>
5.测试
StudentDaoInter.java
package com.undergrowth.inter; import com.undergrowth.Student; public interface StudentDaoInter { public void saveStudent(Student student); public void updateStudent(Student student); public void deleteStudent(Student student); public Student findIdStudent(int id); public Student findNameStudent(String name); }
StudentDaoImp.java
package com.undergrowth.imple; import com.undergrowth.Student; import com.undergrowth.hibernate.utils.HibernateUtils; import com.undergrowth.inter.StudentDaoInter; public class StudentDaoImp implements StudentDaoInter { @Override public void saveStudent(Student student) { // TODO Auto-generated method stub HibernateUtils.add(student); } @Override public void updateStudent(Student student) { // TODO Auto-generated method stub HibernateUtils.update(student); } @Override public void deleteStudent(Student student) { // TODO Auto-generated method stub HibernateUtils.delete(student); } @Override public Student findIdStudent(int id) { // TODO Auto-generated method stub return (Student) HibernateUtils.get(Student.class, id); } @Override public Student findNameStudent(String name) { // TODO Auto-generated method stub return (Student) HibernateUtils.get(name); } }
HibernateUtils.java
package com.undergrowth.hibernate.utils; import java.io.Serializable; import org.hibernate.HibernateException; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; public class HibernateUtils { private static SessionFactory sf; static{ Configuration cfg=new Configuration(); cfg.configure(); sf= cfg.buildSessionFactory(); } public static Session getSession() { return sf.openSession(); } public static void add(Object entity) { Session session=null; Transaction tx=null; try { session=HibernateUtils.getSession(); tx=session.beginTransaction(); session.save(entity); tx.commit(); } catch (HibernateException e) { throw e; }finally{ if(session!=null) session.close(); } } public static void delete(Object entity) { Session session=null; Transaction tx=null; try { session=HibernateUtils.getSession(); tx=session.beginTransaction(); session.delete(entity); tx.commit(); } catch (HibernateException e) { throw e; }finally{ if(session!=null) session.close(); } } public static void update(Object entity) { Session session=null; Transaction tx=null; try { session=HibernateUtils.getSession(); tx=session.beginTransaction(); session.update(entity); tx.commit(); } catch (HibernateException e) { throw e; }finally{ if(session!=null) session.close(); } } public static Object get(Class clazz,Serializable id) { Session session=null; try { session=HibernateUtils.getSession(); Object obj=session.get(clazz, id); return obj; } catch (HibernateException e) { throw e; }finally{ if(session!=null) session.close(); } } public static Object get(String name) { Session session=null; try { session=HibernateUtils.getSession(); Query query=session.createQuery("from Student as student where name=:name"); query.setParameter("name", name); Object obj=query.uniqueResult(); return obj; } catch (HibernateException e) { throw e; }finally{ if(session!=null) session.close(); } } }
HibernateTest.java
package com; import java.util.Date; import com.undergrowth.Student; import com.undergrowth.imple.StudentDaoImp; public class HibernateTest { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub StudentDaoImp imp=new StudentDaoImp(); //添加 Student student=new Student("under", new Date(), "计算机"); System.out.println(student); imp.saveStudent(student); //查询 student=imp.findNameStudent("under"); System.out.println(student); //修改 student.setMajor("电信"); imp.updateStudent(student); //查询 student=imp.findNameStudent("under"); System.out.println(student); //删除 imp.deleteStudent(student); } }
打印的控制台信息