在订单表上触发mysql，其中orders_id与更新过程相同

Question

当表格orders_foods = 1时，我希望表格订单的更新状态为1，其中order_id = order_id与更新相同。

CREATE TRIGGER upd_check AFTER UPDATE ON orders_foods
FOR EACH ROW
BEGIN
   IF (new.status= '1' where old.order_id=new.order_id) THEN
     update  orders 
     set status= '1'
     where old.order_id=old.order_id
   END IF;
END;

订单表 orders_foods表

我不知道如何在更新过程中写入order_id值以触发并使其与订单表上的id相匹配

我的问题解决了

BEGIN
    declare od_status_1 int default 0;
    declare od_number int default 0;
    select count(*) into od_number from orders_foods where orders_foods.order_id = new.order_id;
    select count(*) into od_status_1 from orders_foods where orders_foods.order_id = new.order_id and orders_foods.status = 1;

 if od_number = od_status_1 then
   update  orders
  set status= '1'
  where id=old.order_id;
 end if;

END

鲑鱼到鲑鱼

Answer 1

尝试一下

grunt version

Answer 2

如果在所有order_detail状态都更改为1之前订单状态不应该更改，那么可能是这样的

drop trigger if exists t;
delimiter $$

CREATE TRIGGER t AFTER UPDATE ON od
FOR EACH ROW
BEGIN
        declare od_number int default 0;
        declare od_status_1 int default 0;
        select count(*) into od_number from od where od.order_id = new.order_id;
        select count(*) into od_status_1 from od where od.order_id = new.order_id and od.status = 1;
    insert into debug_table(msg) values
        (concat('new status:', new.status,' od found:',od_number,' od_status_1:',od_status_1))          ;

   IF new.status= 1  THEN
    insert into debug_table (msg) values
        (concat('in status check new status:', new.status,' od found:',od_number,' od_status_1:',od_status_1)   );
     if od_number = od_status_1 then
       update  o
      set status= '1'
      where id=old.order_id;
     end if;
   END IF;
END $$

delimiter ;

请注意使用调试表来进行错误调试。

ariaDB [sandbox]> /*
   /*> drop table if exists o,od;
   /*>
   /*> create table o(id int,status int);
   /*> create table od(id int,order_id int,status int);
   /*> */
MariaDB [sandbox]> truncate table o;
Query OK, 0 rows affected (0.19 sec)

MariaDB [sandbox]> truncate table od;
Query OK, 0 rows affected (0.21 sec)

MariaDB [sandbox]> insert into o values
    -> (1,0),(2,0);
Query OK, 2 rows affected (0.02 sec)
Records: 2  Duplicates: 0  Warnings: 0

MariaDB [sandbox]> insert into od values
    -> (1,1,0),(2,1,0),(3,1,0),(4,2,0);
Query OK, 4 rows affected (0.05 sec)
Records: 4  Duplicates: 0  Warnings: 0

MariaDB [sandbox]>
MariaDB [sandbox]> truncate table debug_table;
Query OK, 0 rows affected (0.34 sec)

MariaDB [sandbox]> update od set od.status = 1 where od.id = 1;
Query OK, 1 row affected (0.02 sec)
Rows matched: 1  Changed: 1  Warnings: 0

MariaDB [sandbox]> select * from o join od on od.order_id = o.id;
+------+--------+------+----------+--------+
| id   | status | id   | order_id | status |
+------+--------+------+----------+--------+
|    1 |      0 |    1 |        1 |      1 |
|    1 |      0 |    2 |        1 |      0 |
|    1 |      0 |    3 |        1 |      0 |
|    2 |      0 |    4 |        2 |      0 |
+------+--------+------+----------+--------+
4 rows in set (0.00 sec)

MariaDB [sandbox]>
MariaDB [sandbox]> update od set od.status = 1 where od.id in (2,4);
Query OK, 2 rows affected (0.02 sec)
Rows matched: 2  Changed: 2  Warnings: 0

MariaDB [sandbox]> select * from o join od on od.order_id = o.id;
+------+--------+------+----------+--------+
| id   | status | id   | order_id | status |
+------+--------+------+----------+--------+
|    1 |      0 |    1 |        1 |      1 |
|    1 |      0 |    2 |        1 |      1 |
|    1 |      0 |    3 |        1 |      0 |
|    2 |      1 |    4 |        2 |      1 |
+------+--------+------+----------+--------+
4 rows in set (0.00 sec)

MariaDB [sandbox]>
MariaDB [sandbox]> select * from debug_table;
+----+-------------------------------------------------------+------+
| id | msg                                                   | MSG2 |
+----+-------------------------------------------------------+------+
|  1 | new status:1 od found:3 od_status_1:1                 | NULL |
|  2 | in status check new status:1 od found:3 od_status_1:1 | NULL |
|  3 | new status:1 od found:3 od_status_1:2                 | NULL |
|  4 | in status check new status:1 od found:3 od_status_1:2 | NULL |
|  5 | new status:1 od found:1 od_status_1:1                 | NULL |
|  6 | in status check new status:1 od found:1 od_status_1:1 | NULL |
+----+-------------------------------------------------------+------+
6 rows in set (0.00 sec)

MariaDB [沙盒]>