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Domain Object 的思考（一）

我們建一個簡單的表如下：

+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id    | varchar(32) |      | PRI |         |       |
| name  | varchar(80) | YES  |     | NULL    |       |
| sex   | char(1)     | YES  |     | NULL    |       |
| age   | int(11)     | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+

manager的接口

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package com.martin.pdo;
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import java.util.List;
4

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/**
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* @author martin.xus
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*/
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public interface UserManager {
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public User load(String id);
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public List loadByName(String name);
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public void add(User user);
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public void remove(User user);
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}
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User,在這里，我們的user已經不在是簡單的getter＆setter，我們引用了一個manager的對象
并且通過spring注入給它，供它使用，這樣我們需要操作用戶時，就如下一樣

添加新用戶



 1User user = (User) context.getBean("user");
2User _u1 = new User();
3//
4user.getManager().add(_u1);
5

 
讀取用戶
1User _u2 = (User) user.getManager().loadByName("martin xus").get(0);

 
讓User帶上manager的功能，這樣，我們便不再需要主動的去聲明manager。

相對而言，如果我們只是在domain object種getter&setter，就需要如下。

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UserManager userManager = (userManager ) context.getBean("userManager ");
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userManager.saveUser(_u1);

整代碼如下：

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package com.martin.pdo;
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import java.io.Serializable;
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/**
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* @author martin.xus
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* @hibernate.class table="t_user"
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* @spring.bean name="user"
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* @spring.property name="manager" ref="userManager"
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*/
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public class User implements Serializable {
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/**
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* @hibernate.id generator-class="uuid.hex"
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* length="32"
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* column="user_id"
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*/
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private String id;
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/**
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* @hibernate.property column="user_name"
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* length="80"
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*/
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private String name;
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/**
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* @hibernate.property
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*/
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private char sex;
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/**
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* @hibernate.property
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*/
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private int age;
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private UserManager manager = null;
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/**
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* @return Returns the manager.
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*/
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public UserManager getManager() {
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return manager;
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}
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/**
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* @param manager The manager to set.
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*/
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public void setManager(UserManager manager) {
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this.manager = manager;
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}
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/**
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* @return Returns the age.
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*/
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public int getAge() {
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return age;
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}
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/**
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* @param age The age to set.
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*/
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public void setAge(int age) {
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this.age = age;
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}
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/**
66

* @return Returns the id.
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*/
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public String getId() {
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return id;
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}
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/**
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* @param id The id to set.
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*/
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public void setId(String id) {
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this.id = id;
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}
78

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/**
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* @return Returns the name.
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*/
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public String getName() {
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return name;
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}
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/**
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* @param name The name to set.
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*/
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public void setName(String name) {
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this.name = name;
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}
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/**
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* @return Returns the sex.
95

*/
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public char getSex() {
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return sex;
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}
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/**
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* @param sex The sex to set.
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*/
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public void setSex(char sex) {
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this.sex = sex;
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}
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}
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UserManager

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package com.martin.pdo;
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import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
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import java.util.List;
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/**
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* @spring.bean name="userManager"
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* @spring.property name="sessionFactory" ref="sessionFactory"
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*/
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public class UserManagerImpl extends HibernateDaoSupport implements
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UserManager {
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public User load(String id) {
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return (User) this.getHibernateTemplate().load(User.class, id);
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}
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public List loadByName(String name) {
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return this.getHibernateTemplate().find("from User as u where u.name=?", name);
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}
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public void add(User user) {
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this.getHibernateTemplate().save(user);
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}
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public void remove(User user) {
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this.getHibernateTemplate().delete(user);
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}
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}

測試
一：生成hbm,bean的文件(build.xml)

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<?xml version="1.0"?>
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<project default="genall" name="PDODemo" basedir=".">
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<property name="lib.dir" value="D:\workspace\xdoclet\xdoclet-1.2.3\lib"/>
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<path id="path">
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<fileset dir="${lib.dir}">
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<include name="*.jar"/>
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</fileset>
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</path>
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<taskdef name="hibernatedoclet"
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classname="xdoclet.modules.hibernate.HibernateDocletTask"
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classpathref="path"/>
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<taskdef name="springdoclet"
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classname="xdoclet.modules.spring.SpringDocletTask"
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classpathref="path"/>
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<target name="genhbm">
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<hibernatedoclet destDir=".">
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<fileset dir=".">
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<include name="**/*.java"/>
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</fileset>
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<hibernate version="3.0"/>
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</hibernatedoclet>
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</target>
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<target name="genbean">
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<springdoclet destDir=".">
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<springxml
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destinationFile="spring.xml" defaultAutowire="yes" mergeDir="merge">
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</springxml>
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<fileset dir=".">
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<include name="com/**/*.java"/>
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</fileset>
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</springdoclet>
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</target>
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<target name="genall" depends="genbean"/>
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</project>
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二：merge 目錄下的spring-beans.xml

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<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
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<property name="location" value="db.properties"/>
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</bean>
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<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
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<property name="driverClassName" value="${jdbc.driverClassName}"/>
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<property name="url" value="${jdbc.url}"/>
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<property name="username" value="${jdbc.username}"/>
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<property name="password" value="${jdbc.password}"/>
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</bean>
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<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
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<property name="dataSource" ref="dataSource"/>
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<property name="mappingResources">
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<value>User.hbm.xml</value>
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</property>
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<property name="hibernateProperties">
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<props>
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<prop key="hibernate.dialect">${hibernate.dialect}</prop>
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<prop key="hibernate.show_sql">true</prop>
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<prop key="hibernate.generate_statistics">true</prop>
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</props>
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</property>
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</bean>
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三：編寫測試代碼

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package com.martin.pdo;
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import org.springframework.context.ApplicationContext;
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import junit.framework.Assert;
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import junit.framework.TestCase;
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public class UserTest extends TestCase {
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public void testUser() {
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ApplicationContext context = JUnitTestHelper.getContext();
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User user = (User) context.getBean("user");
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// create new user
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User _u1 = new User();
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_u1.setName("martin xus");
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_u1.setSex('F');
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_u1.setAge(100);
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user.getManager().add(_u1);
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Assert.assertNotNull(_u1.getId());
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User _u2 = (User) user.getManager().loadByName("martin xus").get(0);
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Assert.assertEquals(_u1.getId(), _u2.getId());
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user.getManager().remove(_u2);
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Assert.assertTrue(user.getManager().loadByName("martin xus").size() == 0);
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}
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}
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ok,在build.xml中添加測試執行代碼。

posted on 2005-09-22 13:31 martin xus 閱讀(203) 評論(1) 編輯收藏所屬分類: java

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Domain Object 的思考（一）

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