Question

我正在使用hibernate注释，我想导出我的数据库架构。

与使用hbm xml文件的schemaexporttask类似。

Answer 1

你可以。就这么做吧

AnnotationConfiguration configuration = new AnnotationConfiguration();

configuration
.addAnnotatedClass(<TYPE_YOUR_CLASS>.class)
.setProperty(Environment.USER, <TYPE_YOUR_USER>)
.setProperty(Environment.PASS, <TYPE_YOUR_PASSWORD>)
.setProperty(Environment.URL, <TYPE_YOUR_URL>)
.setProperty(Environment.DIALECT, <TYPE_YOUR_DIALECT>)
.setProperty(Environment.DRIVER, <TYPE_YOUR_DRIVER>);

SchemaExport schema = new SchemaExport(configuration);
schema.setOutputFile("schema.sql");

schema.create(<DO_YOU_WANT_TO_PRINT_TO_THE_CONSOLE>, <DO_YOU_WANT_TO_EXPORT_THE_SCRIPT_TO_THE_DATABASE>);

Answer 2

实际上，原始的Hibernate Core SchemaExportTask只能处理Hibernate XML映射文件，而不能处理注释。您需要的是Hibernate Tools附带的HibernateToolTask。

这是一个改编自Java Persistence With Hibernate的用法示例：

<taskdef name="hibernatetool"
         classname="org.hibernate.tool.ant.HibernateToolTask"
         classpathref="project.classpath"/>
  <target name="schemaexport" depends="compile, copymetafiles"
          description="Exports a generated schema to DB and file">
    <hibernatetool destdir="${basedir}">
      <classpath path="${build.dir}"/>
      <configuration 
          configurationfile="${build.dir}/hibernate.cfg.xml"/>
      <hbm2ddl
          drop="true"
          create="true"
          export="true"
          outputfilename="helloworld-ddl.sql"
          delimiter=";"
          format="true"/>
    </hibernatetool>
</target>

另见

Hibernate 3 Annotations & Ant

Answer 3

如果有人有兴趣如何使用JPA + Spring从单元测试中执行此操作（您可以轻松地从Eclipse内部生成运行单元测试的sql）：

ExportDatabaseSchema.java：


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
@TransactionConfiguration(defaultRollback=true)
public class ExportDatabaseSchema {

  @Resource(name="&entityManagerFactory")
  private LocalContainerEntityManagerFactoryBean entityManagerFactory;

  @Test
  public void exportDatabaseSchema(){
    PersistenceUnitInfo persistenceUnitInfo = entityManagerFactory.getPersistenceUnitInfo();
    Map jpaPropertyMap = entityManagerFactory.getJpaPropertyMap();

    Configuration configuration = new Ejb3Configuration().configure( persistenceUnitInfo, jpaPropertyMap ).getHibernateConfiguration();

    SchemaExport schema = new SchemaExport(configuration);
    schema.setOutputFile("resources/sql/schema.sql");
    schema.create(false, false);
  }
}

您需要一个ExportDatabaseSchema-context.xml：

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:p="http://www.springframework.org/schema/p"
   xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<import resource="classpath:applicationContext-jpa.xml" /> 
</beans>

applicationContext-jpa.xml包含注释配置的entityManagerFactory bean。诀窍是注入＆amp;像这样：“＆amp; entityManagerFactory”，取消引用spring生成的代理。

Answer 4

使用hibernate3-maven-plugin。然后运行'mvn hibernate3：hbm2ddl'

使用hibernate注释导出模式

4 个答案:

另见