添加 '排行榜'

排行榜

@@ -0,0 +1,15 @@
+class Query_Db(object):
+    def _init_(self, dbname=DB_NAME):
+        self.conn-None
+        self.db_table='books'
+        self.db_name-dbname
+        self.get_conn ()
+
+    def get_conn (self):
+        try：
+           self.conn = sqlite3.connect (self.db_name)
+        except Exception as e:
+            print 'Error:' ,e
+    def get_total_ num(self)；
+
+    def query_pub_company(self)；