Domain Object 的思考（一）

我们建一个简单的表如下：

+-------+-------------+------+-----+---------+-------+
| 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

package com.martin.pdo;
2

import java.util.List;
4

/**
6

* @author martin.xus
7

*/
8

public interface UserManager {
9

public User load(String id);
10

public List loadByName(String name);
12

public void add(User user);
14

public void remove(User user);
16

}
17

User,在这里，我们的user已经不在是简单的getter＆setter，我们引用了一个manager的对象
并且通过spring注入给它，供它使用，这样我们需要操作用户时，就如下一样

添加新用户



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

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

 
让User带上manager的功能，这样，我们便不再需要主动的去声明manager。

相对而言，如果我们只是在domain object种getter&setter，就需要如下。

UserManager userManager = (userManager ) context.getBean("userManager ");
2

userManager.saveUser(_u1);

整代码如下：

package com.martin.pdo;
2

import java.io.Serializable;
4

/**
6

* @author martin.xus
7

* @hibernate.class table="t_user"
8

* @spring.bean name="user"
9

* @spring.property name="manager" ref="userManager"
10

*/
11

public class User implements Serializable {
12

/**
14

* @hibernate.id generator-class="uuid.hex"
15

* length="32"
16

* column="user_id"
17

*/
18

private String id;
19

/**
21

* @hibernate.property column="user_name"
22

* length="80"
23

*/
24

private String name;
25

/**
27

* @hibernate.property
28

*/
29

private char sex;
30

/**
32

* @hibernate.property
33

*/
34

private int age;
35

private UserManager manager = null;
36

/**
38

* @return Returns the manager.
39

*/
40

public UserManager getManager() {
41

return manager;
42

}
43

/**
45

* @param manager The manager to set.
46

*/
47

public void setManager(UserManager manager) {
48

this.manager = manager;
49

}
50

/**
52

* @return Returns the age.
53

*/
54

public int getAge() {
55

return age;
56

}
57

/**
59

* @param age The age to set.
60

*/
61

public void setAge(int age) {
62

this.age = age;
63

}
64

/**
66

* @return Returns the id.
67

*/
68

public String getId() {
69

return id;
70

}
71

/**
73

* @param id The id to set.
74

*/
75

public void setId(String id) {
76

this.id = id;
77

}
78

/**
80

* @return Returns the name.
81

*/
82

public String getName() {
83

return name;
84

}
85

/**
87

* @param name The name to set.
88

*/
89

public void setName(String name) {
90

this.name = name;
91

}
92

/**
94

* @return Returns the sex.
95

*/
96

public char getSex() {
97

return sex;
98

}
99

100

/**
101

* @param sex The sex to set.
102

*/
103

public void setSex(char sex) {
104

this.sex = sex;
105

}
106

107

}
108

UserManager

package com.martin.pdo;
2

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
4

import java.util.List;
6

/**
8

* @spring.bean name="userManager"
9

* @spring.property name="sessionFactory" ref="sessionFactory"
10

*/
11

public class UserManagerImpl extends HibernateDaoSupport implements
12

UserManager {
13

public User load(String id) {
15

return (User) this.getHibernateTemplate().load(User.class, id);
16

}
17

public List loadByName(String name) {
19

return this.getHibernateTemplate().find("from User as u where u.name=?", name);
20

}
21

public void add(User user) {
23

this.getHibernateTemplate().save(user);
24

}
25

public void remove(User user) {
27

this.getHibernateTemplate().delete(user);
28

}
29

}

测试
一：生成hbm,bean的文件(build.xml)

<?xml version="1.0"?>
2

<project default="genall" name="PDODemo" basedir=".">
3

<property name="lib.dir" value="D:\workspace\xdoclet\xdoclet-1.2.3\lib"/>
4

<path id="path">
6

<fileset dir="${lib.dir}">
7

<include name="*.jar"/>
8

</fileset>
9

</path>
10

<taskdef name="hibernatedoclet"
12

classname="xdoclet.modules.hibernate.HibernateDocletTask"
13

classpathref="path"/>
14

<taskdef name="springdoclet"
15

classname="xdoclet.modules.spring.SpringDocletTask"
16

classpathref="path"/>
17

<target name="genhbm">
19

<hibernatedoclet destDir=".">
20

<fileset dir=".">
21

<include name="**/*.java"/>
22

</fileset>
23

<hibernate version="3.0"/>
24

</hibernatedoclet>
25

</target>
26

<target name="genbean">
28

<springdoclet destDir=".">
29

<springxml
30

destinationFile="spring.xml" defaultAutowire="yes" mergeDir="merge">
31

</springxml>
32

<fileset dir=".">
33

<include name="com/**/*.java"/>
34

</fileset>
35

</springdoclet>
36

</target>
37

<target name="genall" depends="genbean"/>
38

</project>
39

二：merge 目录下的spring-beans.xml

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
2

<property name="location" value="db.properties"/>
3

</bean>
4

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
6

<property name="driverClassName" value="${jdbc.driverClassName}"/>
7

<property name="url" value="${jdbc.url}"/>
8

<property name="username" value="${jdbc.username}"/>
9

<property name="password" value="${jdbc.password}"/>
10

</bean>
11

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
13

<property name="dataSource" ref="dataSource"/>
14

<property name="mappingResources">
15

<value>User.hbm.xml</value>
16

</property>
17

<property name="hibernateProperties">
18

<props>
19

<prop key="hibernate.dialect">${hibernate.dialect}</prop>
20

<prop key="hibernate.show_sql">true</prop>
21

<prop key="hibernate.generate_statistics">true</prop>
22

</props>
23

</property>
24

</bean>
25

三：编写测试代码

package com.martin.pdo;
2

import org.springframework.context.ApplicationContext;
4

import junit.framework.Assert;
6

import junit.framework.TestCase;
7

public class UserTest extends TestCase {
9

public void testUser() {
11

ApplicationContext context = JUnitTestHelper.getContext();
12

User user = (User) context.getBean("user");
13

// create new user
15

User _u1 = new User();
16

_u1.setName("martin xus");
17

_u1.setSex('F');
18

_u1.setAge(100);
19

user.getManager().add(_u1);
20

Assert.assertNotNull(_u1.getId());
22

User _u2 = (User) user.getManager().loadByName("martin xus").get(0);
24

Assert.assertEquals(_u1.getId(), _u2.getId());
25

user.getManager().remove(_u2);
27

Assert.assertTrue(user.getManager().loadByName("martin xus").size() == 0);
28

}
29

}
31

ok,在build.xml中添加测试执行代码。

posted on 2005-09-22 13:31 martin xus 阅读(194) 评论(1) 编辑收藏所属分类: java

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