mybatis级联删除
如有两个表：
--收货地址表:es_ShipAddress
create table es_shipAddress(
saId number(7) primary key,
receiveName varchar2(255) not null,
address varchar2(255) not null,
phone varchar2(15) not null,
customer_id number(7) references es_customer(customerId)
);
--订单表:es_orderForm
create table es_orderForm(
orderFormId number(12) primary key,
cost number(9,2) not null,
orderDate date not null,
shipAddress_id number(7) references es_ShipAddress(saId),
customer_id number(7) references es_customer(customerId)
);
收货地址表的主键在订单表里是外键。
一、在不改动表语句的前提下，要根据收货地址ID删除收货地址，可分成两条语句，先删除字表数据es_orderForm，再删除父表数据es_shipAddress：
delete from es_orderForm where shipAddress_id=#{shipAddress_id}
delete from es_shipAddress where saId=#{saId}
即持久层是两条语句共同完成一次操作，那么service层就调用两次mapper接口即可完成。
二、修改建表语句重新建子表
给子表在建立外键关联那可以加 on delete cascade 或者 on delete set null
--订单表:es_orderForm
create table es_orderForm(
orderFormId number(12) primary key,
cost number(9,2) not null,
orderDate date not null,
shipAddress_id number(7) references es_ShipAddress(saId),
customer_id number(7) references es_customer(customerId)
on delete cascade
);
删除时即可一同删除。