一个简单的Hibernate例子

因为我的例子是连接Sql Server 2000的数据库。所以，你得首先安装好Sql Server 2000。然后创建一个student的数据库实例，并创建一张student_table的表。主要包括以下4个字段：
id varchar 32字节 主键
stuName varchar 10字节
cardId varchar 10字节
age int
如果你用的是Workshop或者是别的带有Hibernate数据库联接IDC工具的话，后面的工作就简单了。我们这里先来自己手动写一个。我先说以下，创建后的目录结构大致如下：
src(目录)
BusinessManager(包)
BM.java
model(包)
StudentTable.java
StudentTable.Student.hbm.xml
persistence(包)
DAOImp.java
HibernateUtil.java
hibernate.cfg.xml
lib(目录)
antlr-2.7.6.jar
asm-attrs.jar
asm.jar
cglib-2.1.3.jar
commons-collections-2.1.1.jar
commons-lang-1.0.1.jar
commons-logging-1.0.4.jar
dom4j-1.6.1.jar
ehcache-1.2.jar
jta.jar
log4j-1.2.11.jar
msbase.jar
mssqlserver.jar
msutil.jar

上面已将需要的库文件都包含了，至于每个文件都是做什么的你可以去分别找一下资料了解一下。这里特别要说明的是最后那3个ms开头的文件，这是微软官方发布的用户java连接数据库的驱动文件，你可以去微软网站上下载。注意3个都必须加在进来。还有要提醒大家的是，不是拷贝到lib文件夹下就行了的，主要还是在eclipse的“项目-〉属性-〉构建路径-〉库”中，将这些库都加载进来，否则编译时会依然找不到这些库的。
下面分别是源文件：


package BusinessManager;




import java.util.List;


import persistence.DAOImp;


import model.StudentTable;




public class BM




...{






/** *//**


* @param args


*/


public static void main(String[] args)




...{


// TODO 自动生成方法存根


// 新建学生


StudentTable stu = new StudentTable();


stu.setStuName("Tom");


stu.setCardId("96021313");


stu.setAge(30);


DAOImp.createStu(stu);




// 修改学生


// List list = DAOImp.getAllStu();


// StudentTable stu = (StudentTable)list.get(0);


// stu.setStuName("Jarry");


// stu.setCardId("96031105");


// if (stu.getAge() < 18)


// stu.setAge(18);


// DAOImp.mdfStu(stu);




// 删除学生


// List list = DAOImp.getAllStu();


// StudentTable stu = (StudentTable)list.get(0);


// DAOImp.delStu(stu.getId());




}




}将注释处的内容逐个执行，实现对数据库的添加，修改，删除。注意修改和删除必须在数据库中有记录，否则会报告错误。


import java.io.Serializable;


import org.apache.commons.lang.builder.ToStringBuilder;






public class StudentTable implements Serializable ...{


//default serial version id, required for serializable classes.


private static final long serialVersionUID = 1L;


private String id;


private Integer age;


private String cardId;


private String stuName;






public StudentTable() ...{


}






public String getId() ...{


return this.id;


}




public void setId(String id) ...{


this.id = id;


}






public Integer getAge() ...{


return this.age;


}




public void setAge(Integer age) ...{


this.age = age;


}






public String getCardId() ...{


return this.cardId;


}




public void setCardId(String cardId) ...{


this.cardId = cardId;


}






public String getStuName() ...{


return this.stuName;


}




public void setStuName(String stuName) ...{


this.stuName = stuName;


}






public String toString() ...{


return new ToStringBuilder(this)


.append("id", getId())


.toString();


}


}


package persistence;




import java.util.List;


import model.StudentTable;


import org.hibernate.HibernateException;


import org.hibernate.Query;


import org.hibernate.Session;


import org.hibernate.Transaction;




public class DAOImp




...{


static Session session = null;




public static void createStu(StudentTable stu)




...{


try




...{


session = HibernateUtil.currentSession();


System.out.println(session);


Transaction tx = session.beginTransaction();


session.save(stu);


tx.commit();


}


catch (HibernateException e)




...{


e.printStackTrace();


}


finally




...{


HibernateUtil.closeSession(session);


}


}




public static void delStu(String id)




...{


try




...{


session = HibernateUtil.currentSession();


Transaction tx = session.beginTransaction();


StudentTable stu = (StudentTable)session.get(StudentTable.class, id);


session.delete(stu);


tx.commit();


} catch (HibernateException e)




...{


// TODO 自动生成 catch 块


e.printStackTrace();


} finally




...{


HibernateUtil.closeSession(session);


}


}




public static void mdfStu(StudentTable stu)




...{


try




...{


session = HibernateUtil.currentSession();


Transaction tx = session.beginTransaction();


session.update(stu);


tx.commit();


} catch (HibernateException e)




...{


// TODO 自动生成 catch 块


e.printStackTrace();


} finally




...{


HibernateUtil.closeSession(session);


}


}




public static List getAllStu()




...{


List list = null;


try




...{


session = HibernateUtil.currentSession();


Transaction tx = session.beginTransaction();


Query q = session.createQuery("from StudentTable");


list = q.list();


tx.commit();


} catch (HibernateException e)




...{


// TODO 自动生成 catch 块


e.printStackTrace();


} finally




...{


HibernateUtil.closeSession(session);


}


return list;


}


}




package persistence;




import org.hibernate.HibernateException;


import org.hibernate.Session;


import org.hibernate.SessionFactory;


import org.hibernate.cfg.Configuration;




public class HibernateUtil




...{


private static final SessionFactory sessionFactory;




static




...{


try




...{


sessionFactory = new Configuration().configure().buildSessionFactory();


}


catch(HibernateException ex)




...{


throw new RuntimeException("Exception building SessionFactory;"


+ ex.getMessage(), ex);


}


}




public static Session currentSession() throws HibernateException




...{


Session s = sessionFactory.openSession();


return s;


}




public static void closeSession(Session s)




...{


if (s != null)


s.close();


}




}
以下是两个xml的文件源码，
StudentTable.Student.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="model.StudentTable"


table="student_table"


lazy="false"


>


<id


name="id"


type="string"


column="id"


length="32"


>


<generator class="uuid" />


</id>


<property


name="age"


type="integer"


column="age"


length="10"


/>


<property


name="cardId"


type="string"


column="cardId"


length="10"


/>


<property


name="stuName"


type="string"


column="stuName"


length="20"


/>




<!-- Associations -->




</class>


</hibernate-mapping>


HibernateUtil.cfg.xml


<!DOCTYPE hibernate-configuration PUBLIC


"-//Hibernate/Hibernate Configuration DTD 3.0//EN"


"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">




<hibernate-configuration>


<session-factory>


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


<property name="hibernate.connection.driver_class">com.microsoft.jdbc.sqlserver.SQLServerDriver</property>


<property name="hibernate.connection.url">jdbc:microsoft:sqlserver://lmvs2003:1433;DatabaseName=student</property>


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


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


<mapping resource="model/StudentTable.Student.hbm.xml"/>


</session-factory>


</hibernate-configuration> 转自/article/11635648.html