如何用XDoclet生成hbm.xml文件

在数据库建立后，可以用Middlegen生成每个表对应的hbm.xml文件，并用hibernate-extensions生成对应的Java类。在后期开发时，如果要修改表，修改完后再走一遍这样的流程，那就显得有些繁琐。用XDoclet可以直接根据修改后的Java类生成对应的hbm.xml文件，这样可以减少维护的工作量。下面是我的一个简单例子。
我使用的数据库是MySQL 4.1.11，在数据库test中有这样一个用户表：

1 CREATE TABLE IF NOT EXISTS User
2 (
3    Guid                            INT                              NOT NULL AUTO_INCREMENT,
4    Account                         VARCHAR ( 64 )                     NOT NULL ,
5    Password                        VARCHAR ( 16 )                     NOT NULL ,
6    Email                           VARCHAR ( 128 )                    NOT NULL ,
7     PRIMARY KEY (Guid)
8 ) TYPE = InnoDB;

根据该表写了一个User类，并且加上了XDoclet的tag。XDoclet有关hibernate的tag可以参考： http://xdoclet.sourceforge.net/xdoclet/tags/hibernate-tags.html

1 package sample.hibernate;
 2
 3 import java.io.Serializable;
 4
 5 /**/ /**
 6 * Title: 
 7 *
 8 * Description: 
 9 *
10 * Copyright: Copyright (c) 2005
11 *
12 * Company: 
13 *
14 * @author George Hill
15 * @version 1.0
16 */
17
18 /**/ /**
19 * @hibernate.class
20 * table="User"
21 * dynamic-update="true"
22 * dynamic-insert="true"
23 */
24 public class User implements Serializable {
25
26 // identifier field
27 private int guid;
28
29 // persistent field
30 private String account;
31
32 // persistent field
33 private String password;
34
35 // persistent field
36 private String email;
37
38 /**//**
39 * default constructor
40 */
41 public User() {}
42
43 /**//**
44 * full constructor
45 */
46 public User(String account, String password, String email) {
47 this.account = account;
48 this.password = password;
49 this.email = email;
50 }
51
52 /**//**
53 * @hibernate.id
54 * generator-class="native"
55 * type="int"
56 * column="Guid"
57 */
58 public int getGuid() {
59 return guid;
60 }
61
62 public void setGuid(int guid) {
63 this.guid = guid;
64 }
65
66 /**//**
67 * @hibernate.property
68 * column="Account"
69 * length="64"
70 * not-null="true"
71 */
72 public String getAccount() {
73 return account;
74 }
75
76 public void setAccount(String account) {
77 this.account = account;
78 }
79
80 /**//**
81 * @hibernate.property
82 * column="Password"
83 * length="16"
84 * not-null="true"
85 */
86 public String getPassword() {
87 return password;
88 }
89
90 public void setPassword(String password) {
91 this.password = password;
92 }
93
94 /**//**
95 * @hibernate.property
96 * column="Email"
97 * length="128"
98 * not-null="true"
99 */
100 public String getEmail() {
101 return email;
102 }
103
104 public void setEmail(String email) {
105 this.email = email;
106 }
107
108}
109

为了生成hbm.xml文件，需要用到ant，下面是我的build.xml文件的内容：

1 <? xml version="1.0" encoding="ISO-8859-1" ?>
2
3 < project name ="Hibernate XDoclet Examples" default ="hibernate" basedir ="." >
4 < property name ="xdoclet.root.dir" value ="D:/lib/xdoclet-1.2.3" />
5 < property name ="xdoclet.lib.dir" value ="${xdoclet.root.dir}/lib" />
6
7 < path id ="sampleclasspath" >
8 < fileset dir ="${xdoclet.lib.dir}" >
9 < include name ="*.jar" />
10 </ fileset >
11 </ path >
12
13 < taskdef
14 name ="hibernatedoclet"
15 classname ="xdoclet.modules.hibernate.HibernateDocletTask"
16 classpathref ="sampleclasspath"
17 />
18
19 < target name ="hibernate" description ="Generate mapping documents" >
20
21 < echo > +---------------------------------------------------+ </ echo >
22 < echo > | | </ echo >
23 < echo > | R U N N I N G H I B E R N A T E D O C L E T | </ echo >
24 < echo > | | </ echo >
25 < echo > +---------------------------------------------------+ </ echo >
26
27 < hibernatedoclet
28 destdir ="./src"
29 excludedtags ="@version,@author,@todo,@see"
30 addedtags ="@xdoclet-generated at ${TODAY},@copyright The XDoclet Team,@author XDoclet,@version ${version}"
31 force ="false"
32 verbose ="true" >
33
34 < fileset dir ="./src" >
35 < include name ="sample/hibernate/*.java" />
36 </ fileset >
37
38 < hibernate version ="2.1" />
39
40 </ hibernatedoclet >
41 </ target >
42 </ project >
43

build.xml文件中的第四行是指定XDoclet的根路径，需要根据解压的路径做相应的修改。XDoclet的下载地址： http://xdoclet.sourceforge.net/xdoclet/install.html。在taskdef里面需要指定classname为xdoclet.modules.hibernate.HibernateDocletTask。在34行的fileset里面需要指定你的Java类所在的包路径。
运行ant，可以看到生成的User.hbm.xml文件的内容如下：

<? xml version="1.0" encoding="UTF-8" ?>

<! DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >

< hibernate-mapping
>
 < class
 name ="sample.hibernate.User"
 table ="User"
 dynamic-update ="true"
 dynamic-insert ="true"
 >

 < id
 name ="guid"
 column ="Guid"
 type ="int"
 >
 < generator class ="native" >
 
 </ generator >
 </ id >

 < property
 name ="account"
 type ="java.lang.String"
 update ="true"
 insert ="true"
 column ="Account"
 length ="64"
 not-null ="true"
 />

 < property
 name ="password"
 type ="java.lang.String"
 update ="true"
 insert ="true"
 column ="Password"
 length ="16"
 not-null ="true"
 />

 < property
 name ="email"
 type ="java.lang.String"
 update ="true"
 insert ="true"
 column ="Email"
 length ="128"
 not-null ="true"
 />

 

 </ class >

</ hibernate-mapping >

如何用XDoclet生成hbm.xml文件

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