hibernate 脏数据检查 dirtyCheck

在对hibernate中的关联表进行数据更新时 会对数据机型脏数据检查

 

该操作的主要方法：dirtyCheck

 

该位于org.hibernate.event.def.DefaultFlushEntityEventListener

 

protected void dirtyCheck(FlushEntityEvent event) throws HibernateException {// 监听待检查的 实体EntityBeanfinal Object entity = event.getEntity(); // 获取EntityBean属性列表 : // 利用此方式可以查看 hibernate 生成的带参数的sql的具体值final Object[] values = event.getPropertyValues();final SessionImplementor session = event.getSession();final EntityEntry entry = event.getEntityEntry();final EntityPersister persister = entry.getPersister();final Serializable id = entry.getId();final Object[] loadedState = entry.getLoadedState();int[] dirtyProperties = session.getInterceptor().findDirty( entity, id, values, loadedState, persister.getPropertyNames(), persister.getPropertyTypes() );event.setDatabaseSnapshot(null);final boolean interceptorHandledDirtyCheck;boolean cannotDirtyCheck;if ( dirtyProperties==null ) {// Interceptor returned null, so do the dirtycheck ourself, if possibleinterceptorHandledDirtyCheck = false;cannotDirtyCheck = loadedState==null; // object loaded by update()if ( !cannotDirtyCheck ) {// dirty check against the usual snapshot of the entitydirtyProperties = persister.findDirty( values, loadedState, entity, session );}else {// dirty check against the database snapshot, if possible/necessaryfinal Object[] databaseSnapshot = getDatabaseSnapshot(session, persister, id);if ( databaseSnapshot != null ) {dirtyProperties = persister.findModified(databaseSnapshot, values, entity, session);cannotDirtyCheck = false;event.setDatabaseSnapshot(databaseSnapshot);}}}else {// the Interceptor handled the dirty checkingcannotDirtyCheck = false;interceptorHandledDirtyCheck = true;}event.setDirtyProperties(dirtyProperties);event.setDirtyCheckHandledByInterceptor(interceptorHandledDirtyCheck);event.setDirtyCheckPossible(!cannotDirtyCheck);}