用于Hibernate的Maven Java源代码生成

Question

我正忙着将现有项目从Ant构建转换为使用Maven的项目.此构建的一部分包括使用hibernate hbm2java工具将.hbm.xml文件的集合转换为Java.这是用于执行此操作的Ant脚本的片段:

<target name="dbcodegen" depends="cleangen" 
        description="Generate Java source from Hibernate XML">
  <hibernatetool destdir="${src.generated}">
    <configuration>   
      <fileset dir="${src.config}">
        <include name="**/*.hbm.xml"/>
      </fileset>
    </configuration>   
    <hbm2java jdk5="true"/>
  </hibernatetool>   
</target>

我在互联网上看了一下,有些人似乎这样做(我认为)使用Maven中的Ant和Maven插件中的其他人.我宁愿避免混合Ant和Maven.任何人都可以建议一种方法来执行此操作,以便拾取所有.hbm.xml文件并生成代码作为Maven代码生成构建阶段的一部分吗？

谢谢!

亚当.

Answer 1

好吧,如果你不想混合Ant和Maven(这是IMO的一个好主意),就有Maven Hibernate3插件.它的hbm2java目标默认绑定到generate-sources阶段.有关更多详细信息,请参阅Mojo的网站,但插件的设置可能如下所示:

  <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>hibernate3-maven-plugin</artifactId>
    <version>2.2</version>
    <executions>
      <execution>
        <phase>generate-sources</phase>
        <goals>
          <goal>hbm2java</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <components>
        <component>
          <name>hbm2java</name>
          <implementation>configuration</implementation>
          <outputDirectory>target/generated-sources/hibernate3</outputDirectory>
        </component>
      </components>
      <componentProperties>
        <drop>true</drop>
        <jdk5>true</jdk5>
        <configurationfile>/src/main/resources/hibernate.cfg.xml</configurationfile>
      </componentProperties>
    </configuration>
  </plugin> 

编辑:该插件实际上是寻找.hbm.xml中target/classes生成Java源文件.因此,如果您将映射文件放入其中src/main/resources,它们将在插件调用target/classes的process-resources阶段被复制,并且事情将正常工作.我刚刚使用以下示例项目对此进行了测试:

maven-hibernate3-testcase
|-- pom.xml
`-- src
    |-- main
    |   |-- java
    |   `-- resources
    |       |-- Person.hbm.xml
    |       `-- hibernate.cfg.xml
    `-- test
        `-- java

在pom.xml几乎是空的,它只是包含了上面看到的插件配置和JUnit的依赖.该hibernate.cfg.xml包含:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <!-- Database connection settings -->
    <property name="connection.driver_class">org.apache.derby.jdbc.ClientDriver</property>
    <property name="connection.url">jdbc:derby://localhost:1527/mydatabase</property>
    <property name="connection.username">app</property>
    <property name="connection.password">app</property>

    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">1</property>

    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.DerbyDialect</property>

    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">false</property>

    <!-- Mapping files -->
    <mapping resource="Person.hbm.xml" />
  </session-factory>
</hibernate-configuration>

而且Person.hbm.xml看起来如下:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping
   PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

  <class name="Person" table="person">
    <id name="id" type="int">
      <generator class="increment" />
    </id>

    <property name="name" column="cname" type="string" />
  </class>

</hibernate-mapping>

使用此配置,运行mvn install生成Person.java如下所示:

$ cat target/generated-sources/hibernate3/Person.java 
// default package
// Generated Dec 14, 2009 2:19:22 PM by Hibernate Tools 3.2.2.GA



/**
 * Person generated by hbm2java
 */
public class Person  implements java.io.Serializable {


     private int id;
     private String name;

    public Person() {
    }

    public Person(String name) {
       this.name = name;
    }

    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }




}

一切都按照描述运作.