Maven + Hibernate注释架构生成

Question

我有一堆用hibernate注释注解的类。我使用Maven，Hibernate和Spring。我如何使用hibernate3-maven-plugin的hbm2ddl生成数据库模式？

Answer 1

很短的例子是这样的：

<build> 
<plugins> 
    <plugin> 
    <groupId>org.codehaus.mojo</groupId> 
    <artifactId>hibernate3-maven-plugin</artifactId> 
    <version>2.2</version> 
    <configuration> 
     <components> 
     <component> 
      <name>hbm2ddl</name> 
      <implementation>jdbcconfiguration</implementation> 
     </component> 
     </components> 
     <componentProperties> 
     <drop>true</drop> 
     <configurationfile>/src/main/resources/hibernate.cfg.xml</configurationfile> 
     </componentProperties> 
    </configuration> 
    <dependencies> 
     <dependency> 
     <groupId>jdbc.artifact.groupid</groupId> 
     <artifactId>jdbc-driver</artifactId> 
     <version>1.0</version> 
     </dependency> 
    </dependencies> 
    </plugin> 
</plugins> 

当然读documentation，并会都有帮助。

Answer 2

让我们假设你的项目有以下结构：

 
. 
├── pom.xml 
└── src 
    ├── main 
    │   ├── java 
    │   │   └── com 
    │   │    └── stackoverflow 
    │   │     └── Foo.java 
    │   └── resources 
    │    └── META-INF 
    │     └── persistence.xml 
    └── test 
     └── java 

那persistence.xml包含以下内容：

<persistence> 
    <persistence-unit name="MyPu" transaction-type="RESOURCE_LOCAL"> 
    <provider>org.hibernate.ejb.HibernatePersistence</provider> 
    <class>com.stackoverflow.Foo</class> 
    <exclude-unlisted-classes>true</exclude-unlisted-classes> 
    <properties> 
     <property name="hibernate.connection.driver_class" value="org.h2.Driver"/> 
     <property name="hibernate.connection.url" value="jdbc:h2:mem:Q4029456-1.0-SNAPSHOT"/> 
     <property name="hibernate.connection.user" value="APP"/> 
     <property name="hibernate.connection.password" value="APP"/> 
     <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/> 
    </properties> 
    </persistence-unit> 
</persistence> 

然后下面的配置模式输出作为构建的一部分：

<project> 
    <modelVersion>4.0.0</modelVersion> 
    <groupId>com.stackoverflow</groupId> 
    <artifactId>Q4029456</artifactId> 
    <version>1.0-SNAPSHOT</version> 
    <properties> 
    <maven.compiler.source>1.6</maven.compiler.source> 
    <maven.compiler.target>1.6</maven.compiler.target> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    </properties> 
    <dependencies> 
    <dependency> 
     <groupId>org.hibernate</groupId> 
     <artifactId>hibernate-entitymanager</artifactId> 
     <version>3.4.0.GA</version> 
    </dependency> 
    <dependency> 
     <groupId>com.h2database</groupId> 
     <artifactId>h2</artifactId> 
     <version>1.2.144</version> 
    </dependency> 
    ... 
    </dependencies> 
    <repositories> 
    <repository> 
     <id>repository.jboss.org-public</id> 
     <name>JBoss repository</name> 
     <url>https://repository.jboss.org/nexus/content/groups/public</url> 
    </repository> 
    </repositories> 
    <build> 
    <plugins> 
     <plugin> 
     <groupId>org.codehaus.mojo</groupId> 
     <artifactId>hibernate3-maven-plugin</artifactId> 
     <version>2.2</version> 
     <configuration> 
      <components> 
      <component> 
       <name>hbm2ddl</name> 
       <implementation>jpaconfiguration</implementation> 
      </component> 
      </components> 
      <componentProperties> 
      <drop>true</drop> 
      <!-- optional, but useful for later inspection --> 
      <outputfilename>schema.ddl</outputfilename> 
      <persistenceunit>MyPu</persistenceunit> 
      </componentProperties> 
     </configuration> 
     <executions> 
      <execution> 
      <phase>process-classes</phase> 
      <goals> 
       <goal>hbm2ddl</goal> 
      </goals> 
      </execution> 
     </executions> 
     <dependencies> 
      <dependency> 
      <groupId>com.h2database</groupId> 
      <artifactId>h2</artifactId> 
      <version>1.2.144</version> 
      </dependency> 
     </dependencies> 
     </plugin> 
    </plugins> 
    </build> 
</project> 

替换jpaconfiguration和persitence.xml由annotationconfiguration和src/main/resources/hibernate.cfg.xml如果您不使用JPA。

下面所获得的输出的提取物：

 
$ mvn process-classes 
[INFO] Scanning for projects... 
... 
[INFO] --- hibernate3-maven-plugin:2.2:hbm2ddl (default) @ Q4029456 --- 
... 
drop table Foo if exists; 
create table Foo (id bigint generated by default as identity, name varchar(255), primary key (id)); 
... 
[INFO] ------------------------------------------------------------------------ 
[INFO] BUILD SUCCESS 
[INFO] ------------------------------------------------------------------------ 
...