菜鸟学习hibernate笔记<五>

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hibernate

Hibernate Java .net XML Access

新建一个类，包

· 这个类是父类，要注意，这里并没有将父类映射成表。

java 代码

Person.java
/*
* Hibernate - 继承映射(每个具体类一个表)
* 创建日期 2005-4-9
* @author javamxj（分享java快乐）
* @link Blog: htpp://javamxj.mblogger.cn
* htpp://blog.csdn.net/javamxj/
*/
package javamxj.inheritance.three;
public abstract class Person {
private Long id;
private String name;
/**
* @hibernate.id
* column="ID"
* generator-class="hilo"
* unsaved-value="null"
*/
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
/**
* @hibernate.property
* length = "24"
*/
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

java 代码

Student.java
package javamxj.inheritance.three;
/**
* @hibernate.class
* table="Student"
*/
public class Student extends Person {
private String studentNumber;
/**
* @hibernate.property
* length = "24"
*/
public String getStudentNumber() {
return studentNumber;
}
public void setStudentNumber(String studentNumber) {
this.studentNumber = studentNumber;
}
}

java 代码

Professor.java
package javamxj.inheritance.three;
/**
* @hibernate.class
* table="Professor"
*/
public class Professor extends Person {
private int salary;
/**
* @hibernate.property
*/
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
}

xml 代码

Professor.hbm.xml
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping
>
<class
name="javamxj.inheritance.three.Professor"
table="Professor"
dynamic-update="false"
dynamic-insert="false"
select-before-update="false"
optimistic-lock="version"
>
<id
name="id"
column="ID"
type="java.lang.Long"
unsaved-value="null"
>
<generator class="hilo">
<!--
To add non XDoclet generator parameters, create a file named
hibernate-generator-params-Professor.xml
containing the additional parameters and place it in your merge dir.
-->
</generator>
</id>
<property
name="salary"
type="int"
update="true"
insert="true"
access="property"
column="salary"
/>
<property
name="name"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="name"
length="24"
/>
<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-Professor.xml
containing the additional properties and place it in your merge dir.
-->
</class>
</hibernate-mapping>

xml 代码

Student.hbm.xml
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping
>
<class
name="javamxj.inheritance.three.Student"
table="Student"
dynamic-update="false"
dynamic-insert="false"
select-before-update="false"
optimistic-lock="version"
>
<id
name="id"
column="ID"
type="java.lang.Long"
unsaved-value="null"
>
<generator class="hilo">
<!--
To add non XDoclet generator parameters, create a file named
hibernate-generator-params-Student.xml
containing the additional parameters and place it in your merge dir.
-->
</generator>
</id>
<property
name="studentNumber"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="studentNumber"
length="24"
/>
<property
name="name"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="name"
length="24"
/>
<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-Student.xml
containing the additional properties and place it in your merge dir.
-->
</class>
</hibernate-mapping>

数据库：

create table Student (
   ID bigint not null,
   studentNumber varchar(24),
   name varchar(24),
   primary key (ID)
)

create table Professor (
   ID bigint not null,
   salary integer,
   name varchar(24),
   primary key (ID)
)

java 代码

Demo.java
/*
* Hibernate - 继承映射(每个具体类一个表)
* 创建日期 2005-4-9
* @author javamxj（分享java快乐）
* @link Blog: htpp://javamxj.mblogger.cn
* htpp://blog.csdn.net/javamxj/
*/
package javamxj.inheritance.three;
import java.util.Iterator;
import java.util.List;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.cfg.Configuration;
public class Demo {
public static void main(String[] args) {
try {
new Demo();
} catch (HibernateException he) {
he.printStackTrace();
}
}
public Demo() throws HibernateException {
SessionFactory sf = new Configuration().configure()
.buildSessionFactory();
Session sess = sf.openSession();
Transaction tx = null;
try {
tx = sess.beginTransaction();
Student student = new Student();
student.setName("张三");
student.setStudentNumber("1234554321");
sess.save(student);
Professor professor = new Professor();
professor.setName("李四");
professor.setSalary(4300);
sess.save(professor);
tx.commit();
} catch (HibernateException e) {
if (tx != null)
tx.rollback();
throw e;
} finally {
sess.close();
}
sess = sf.openSession();
tx = null;
try {
tx = sess.beginTransaction();
List person = sess.find("from " + Person.class.getName());
for (Iterator it = person.iterator(); it.hasNext();) {
Person p = (Person) it.next();
System.out.println("人员 '" + p.getName() + "' its class is: "
+ p.getClass().getName());
}
tx.commit();
} catch (HibernateException e) {
if (tx != null)
tx.rollback();
throw e;
} finally {
sess.close();
}
}
}

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2007-05-20 13:02
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