[英]Sqlalchemy mass deletion orm creation
如何在sqlalchemy orm中表达以下查询?
DELETE FROM ACCESS_STRING_DETAILS WHERE MENU_ID IN(SELECT MENU_ID FROM REDIRECTOR WHERE SERVICE=122)
DELETE FROM TIME_DETAILS WHERE MENU_ID IN(SELECT MENU_ID FROM REDIRECTOR WHERE SERVICE=122)
DELETE FROM REDIRECTOR_INPUT_PARAMS WHERE COMMAND_ID IN(SELECT KEYWORD FROM REDIRECTOR WHERE SERVICE=122)
DELETE FROM REDIRECTOR_COMMANDS WHERE COMMAND_ID IN(SELECT KEYWORD FROM REDIRECTOR WHERE SERVICE=122)
DELETE FROM RANGE_DETAILS WHERE COMMAND_ID IN(SELECT KEYWORD FROM REDIRECTOR WHERE SERVICE=122)
DELETE FROM CLIENT_RSP_DETAILS WHERE KEYWORD IN(SELECT KEYWORD FROM REDIRECTOR WHERE SERVICE=122)
DELETE FROM REDIRECTOR WHERE SERVICE=122
我基本上需要从REDIRECTOR
表中MENU_ID
与特定SERVICE
MENU_ID
和KEYWORD
相匹配的表中的所有记录
您可以先在SERVICE=122
单独捕获过滤器; 我假设您使用camelcase为所有与表名称匹配的表提供了模型。
menu_id和关键字选择也被存储以供重用:
service_filter = Redirector.service == 122
menu_id_select = session.query(Redirector.menu_id).filter(service_filter)
keyword_select = session.query(Redirector.keyword).filter(service_filter)
现在,您可以将这些选择应用于所有删除查询:
(session
.query(AccessStringDetails)
.filter(AccessStringDetails.menu_id.in_(menu_id_select))
.delete(False))
(session
.query(TimeDetails)
.filter(TimeDetails.menu_id.in_(menu_id_select))
.delete(False))
(session
.query(RedirectorInputParams)
.filter(RedirectorInputParams.command_id.in_(keyword_select))
.delete(False))
# etc.
session.query(Redirector).filter(service_filter).delete(False)
这些示例将Column.in_
方法与select语句一起使用,将后者转换为子选择,以产生如下查询:
DELETE FROM access_string_details WHERE access_string_details.menu_id IN (SELECT redirector.menu_id AS redirector_menu_id
FROM redirector
WHERE redirector.service = :service_1)
:service_1
参数设置为122
。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.