Add new generator-method to fetch RedFams by Status and Ending

Related Task: [https://fs.golderweb.de/index.php?do=details&task_id=26 FS#26]

lib/mysqlred.py

@@ -246,6 +246,7 @@ class MysqlRedFam( MysqlRed ):
     _update_query = 'UPDATE `{prefix}_red_families` \
 SET `red_page_id` = ?, `heading` = ?, `beginning` = ?, `ending` = ?, \
 `status`= ? WHERE `fam_hash` = ?;'
+
     _cached_insert_data = {}
     _insert_query = 'INSERT INTO `{prefix}_red_families` \
 ( fam_hash, red_page_id, beginning, ending, status, heading, \
@@ -259,9 +260,6 @@ article7 ) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? );'
 
         super().__init__( )
 
-    def __del__( self ):
-        pass
-
     def get_fam( self, fam_hash ):
         """
         Retrieves a red family row from MySQL-Database for given fam_hash
@@ -335,6 +333,25 @@ article7 ) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? );'
             for row in res:
                 yield row
 
+    def get_by_status_and_ending( self, status, ending ):
+        """
+        Generator witch fetches redFams  with given status from DB
+        """
+
+        cursor = type( self ).connection.cursor( mysqldb.DictCursor )
+
+        cursor.execute(
+            'SELECT * FROM `{prefix}_red_families` WHERE `status` = ? AND'.
+            format(prefix=type( self ).db_table_prefix) +
+            '`ending` >= ?;', ( status, ending ) )
+
+        while True:
+            res = cursor.fetchmany( 1000 )
+            if not res:
+                break
+            for row in res:
+                yield row
+
 
 class MysqlRedError(Exception):
     """