code: func (db *DB) SearchFile(name string) (*Doc, error) {
  	var doc *Doc
  	err := db.store.Select(db.meta, &doc, `where "File" = ?`, name)
  	if err != nil {
  		return nil, err
  	}
  	if doc == nil {
  		return nil, ErrNotFound
  	}
  	return doc, nil
  }
docs: // SearchFile searches the database for the document describing the named file.