更新attr_values mongo处理

fun/param_data.py

@@ -219,7 +219,8 @@ class ParamData(object):
     @staticmethod
     def get_attr_name(attr_id, class_conn):
         sql = "SELECT attr_name FROM lie_class_attr WHERE attr_id=%s" % attr_id
-        return DBHandler.read(class_conn, sql)
+        res = DBHandler.read(class_conn, sql)
+        return res[0][0] if len(res) > 0 else ''
 
     """
     获取参数值
@@ -227,7 +228,8 @@ class ParamData(object):
     @staticmethod
     def get_attr_value(attr_value_id, class_conn):
         sql = "SELECT value FROM lie_class_attr_value WHERE attr_value_id=%s" % attr_value_id
-        return DBHandler.read(class_conn, sql)
+        res = DBHandler.read(class_conn, sql)
+        return res[0][0] if len(res) > 0 else ''
 
     """
     获取参数单位
@@ -235,7 +237,8 @@ class ParamData(object):
     @staticmethod
     def get_attr_unit(attr_unit_id, class_conn):
         sql = "SELECT attr_unit_name FROM lie_class_attr_unit WHERE attr_unit_id=%s" % attr_unit_id
-        return DBHandler.read(class_conn, sql)
+        res = DBHandler.read(class_conn, sql)
+        return res[0][0] if len(res) > 0 else ''
 
     """
     获取SPU 数据