Question

我正在向现有的hibernate实体添加envers。到目前为止，审计工作一切顺利，但查询是一个不同的问题，因为修订表没有填充现有数据。还有其他人已经解决了这个问题吗？也许您已经找到了一些方法来使用现有表填充修订表？我想我会问，我相信其他人会发现它很有用。

Answer 1

我们通过运行一系列原始SQL查询来填充初始数据，以模拟＆＃34;插入＆＃34;所有现有实体，就好像它们刚刚同时创建一样。例如：

insert into REVINFO(REV,REVTSTMP) values (1,1322687394907); 
-- this is the initial revision, with an arbitrary timestamp

insert into item_AUD(REV,REVTYPE,id,col1,col1) select 1,0,id,col1,col2 from item; 
-- this copies the relevant row data from the entity table to the audit table

请注意 REVTYPE 值 0 表示插入（与修改相对）。

Answer 2

如果您使用的是Envers ValidityAuditStrategy并且已创建的数据不是启用了Envers，则此类别中存在问题。

在我们的案例中（Hibernate 4.2.8.Final），基本对象更新抛出“无法更新实体的先前版本和”（记录为[org.hibernate.AssertionFailure] HHH000099）。

我花了一些时间才发现这个讨论/解释，所以交叉发布：

ValidityAuditStrategy with no audit record

Answer 3

你不需要。
AuditQuery允许您通过以下方式获取RevisionEntity和数据修订：

AuditQuery query = getAuditReader().createQuery()
                .forRevisionsOfEntity(YourAuditedEntity.class, false, false);

这将构造一个返回Object [3]列表的查询。 Fisrt元素是您的数据，第二个是修订实体，第三个是修订类型。

Answer 4

我们已经解决了使用现有数据填充审核日志的问题，如下所示：

SessionFactory defaultSessionFactory;

// special configured sessionfactory with envers audit listener + an interceptor 
// which flags all properties as dirty, even if they are not.
SessionFactory replicationSessionFactory;

// Entities must be retrieved with a different session factory, otherwise the 
// auditing tables are not updated. ( this might be because I did something 
// wrong, I don't know, but I know it works if you do it as described above. Feel
// free to improve )

FooDao fooDao = new FooDao();
fooDao.setSessionFactory( defaultSessionFactory );
List<Foo> all = fooDao.findAll();

// cleanup and close connection for fooDao here.
..

// Obtain a session from the replicationSessionFactory here eg.
Session session = replicationSessionFactory.getCurrentSession();

// replicate all data, overwrite data if en entry for that id already exists
// the trick is to let both session factories point to the SAME database.
// By updating the data in the existing db, the audit listener gets triggered,
// and inserts your "initial" data in the audit tables.
for( Foo foo: all ) {
    session.replicate( foo, ReplicationMode.OVERWRITE ); 
}

我的数据源配置（通过Spring）：

<bean id="replicationDataSource" 
      class="org.apache.commons.dbcp.BasicDataSource" 
      destroy-method="close">
  <property name="driverClassName" value="org.postgresql.Driver"/>
  <property name="url" value=".."/>
  <property name="username" value=".."/>
  <property name="password" value=".."/>
  <aop:scoped-proxy proxy-target-class="true"/>
</bean>

<bean id="auditEventListener" 
      class="org.hibernate.envers.event.AuditEventListener"/>

<bean id="replicationSessionFactory"
      class="o.s.orm.hibernate3.annotation.AnnotationSessionFactoryBean">

  <property name="entityInterceptor">
    <bean class="com.foo.DirtyCheckByPassInterceptor"/>
  </property>

  <property name="dataSource" ref="replicationDataSource"/>
  <property name="packagesToScan">
    <list>
      <value>com.foo.**</value>
    </list>
  </property>

  <property name="hibernateProperties">
    <props>
      ..
      <prop key="org.hibernate.envers.audit_table_prefix">AUDIT_</prop>
      <prop key="org.hibernate.envers.audit_table_suffix"></prop>
    </props>
  </property>
  <property name="eventListeners">
    <map>
      <entry key="post-insert" value-ref="auditEventListener"/>
      <entry key="post-update" value-ref="auditEventListener"/>
      <entry key="post-delete" value-ref="auditEventListener"/>
      <entry key="pre-collection-update" value-ref="auditEventListener"/>
      <entry key="pre-collection-remove" value-ref="auditEventListener"/>
      <entry key="post-collection-recreate" value-ref="auditEventListener"/>
    </map>
  </property>
</bean>

拦截器：

import org.hibernate.EmptyInterceptor;
import org.hibernate.type.Type;
..

public class DirtyCheckByPassInterceptor extends EmptyInterceptor {

  public DirtyCheckByPassInterceptor() {
    super();
  }


  /**
   * Flags ALL properties as dirty, even if nothing has changed. 
   */
  @Override
  public int[] findDirty( Object entity,
                      Serializable id,
                      Object[] currentState,
                      Object[] previousState,
                      String[] propertyNames,
                      Type[] types ) {
    int[] result = new int[ propertyNames.length ];
    for ( int i = 0; i < propertyNames.length; i++ ) {
      result[ i ] = i;
    }
    return result;
  }
}

ps：请记住，这是一个简化的例子。它不会开箱即用，但它会引导您找到可行的解决方案。

Answer 5

查看http://www.jboss.org/files/envers/docs/index.html#revisionlog

基本上你可以使用@RevisionEntity注释定义自己的'修订类型'，然后实现RevisionListener接口以插入您的其他审计数据，喜欢当前用户和高级操作。通常这些是从ThreadLocal上下文中提取的。

Answer 6

您可以使用 find 方法的后备选项扩展 AuditReaderImpl，例如：

    public class AuditReaderWithFallback extends AuditReaderImpl {

    public AuditReaderWithFallback(
            EnversService enversService,
            Session session,
            SessionImplementor sessionImplementor) {
        super(enversService, session, sessionImplementor);
    }

    @Override
    @SuppressWarnings({"unchecked"})
    public <T> T find(
            Class<T> cls,
            String entityName,
            Object primaryKey,
            Number revision,
            boolean includeDeletions) throws IllegalArgumentException, NotAuditedException, IllegalStateException {
        T result = super.find(cls, entityName, primaryKey, revision, includeDeletions);
        if (result == null)
            result = (T) super.getSession().get(entityName, (Serializable) primaryKey);
        return result;
    }
}

在某些情况下，您可以在返回 null 方面添加更多检查。您可能还想使用自己的工厂：

    public class AuditReaderFactoryWithFallback {


    /**
     * Create an audit reader associated with an open session.
     *
     * @param session An open session.
     * @return An audit reader associated with the given sesison. It shouldn't be used
     * after the session is closed.
     * @throws AuditException When the given required listeners aren't installed.
     */
    public static AuditReader get(Session session) throws AuditException {
        SessionImplementor sessionImpl;
        if (!(session instanceof SessionImplementor)) {
            sessionImpl = (SessionImplementor) session.getSessionFactory().getCurrentSession();
        } else {
            sessionImpl = (SessionImplementor) session;
        }

        final ServiceRegistry serviceRegistry = sessionImpl.getFactory().getServiceRegistry();
        final EnversService enversService = serviceRegistry.getService(EnversService.class);

        return new AuditReaderWithFallback(enversService, session, sessionImpl);
    }

}

使用来自Hibernate实体的现有数据填充修订表

6 个答案: