Examples of org.apache.derby.iapi.store.access.FileResource

• org.apache.derby.iapi.store.access.FileResource
  Management of file resources within a database. Suitable for jar files, images etc.

  A file resource is identified by the pair (name,generationId). Name is an arbitrary String supplied by the caller. GenerationId is a non-repeating sequence number constructed by the database. Within a database a (name,generationId) pair uniquely identifies a version of a file resource for all time. Newer generation numbers reflect newer versions of the file.

  A database supports the concept of a designated current version of a fileResource. The management of the current version is transactional. The following rules apply

  1. Adding a FileResource makes the added version the current version
  2. Removing a FileResource removes the current version of the resource. After this operation the database holds no current version of the FileResoure.
  3. Replacing a FileResource removes the current version of the resource.

  For the benefit of replication, a database optionally retains historic versions of stored files. These old versions are useful when processing old transactions in the stage.

Related Classes of org.apache.derby.iapi.store.access.FileResource