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mysql - 更新触发器不同日期

转载 作者:行者123 更新时间:2023-11-29 02:39:26 24 4
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我正在做一个项目,但我卡在了这个触发器上。这是涉及到的两个表。

    ---------------+---------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+---------------+------+-----+---------+----------------+
| id_tra | int(11) | NO | PRI | NULL | auto_increment |
| nombre_tra | varchar(100) | NO | | NULL | |
| apellidos_tra | varchar(100) | NO | | NULL | |
| dni_tra | varchar(1000) | NO | | NULL | |
| telefono_tra | int(10) | NO | | NULL | |
| falta_tra | date | NO | | NULL | |
| dias_tra | int(255) | NO | | NULL | |
+---------------+---------------+------+-----+---------+----------------+

+--------------+----------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+----------+------+-----+---------+----------------+
| id_rec | int(11) | NO | PRI | NULL | auto_increment |
| id_tra_rec | int(11) | NO | MUL | NULL | |
| id_var_rec | int(11) | NO | MUL | NULL | |
| fecha_rec | date | NO | | NULL | |
| cantidad_rec | int(255) | NO | | NULL | |
+--------------+----------+------+-----+---------+----------------+

在这种情况下,id_traid_tra_rec 是相关的,我需要一个触发器来更新 < strong>dias_tra on dias_tra + 1 for id_tra = id_tra_rec 当有 在第二个表格图像上插入。这相对容易,但奇怪的是 Insert 可能有不同的数据但相同的日期 (fecha_rec),因此触发器必须知道是否存在具有相同 ID 和相同日期的行 (< strong>fecha_rec) 以不更新 dias_tra。像选择不同的东西。这是我尝试过的:

create trigger dias_tra 
after insert on datos_recogida
for each row
begin
if (select fecha_rec from datos_recogida where id_tra_rec=new.id_trarec and fecha_rec=new.fecha_rec)
update datos_trabajadores set dias_tra = dias_tra +1 where id_tra=new.id_tra_rec
end if;
end;

抱歉我的英语不好,第一次来这里,希望你能理解。如果您需要更多信息,我就在附近 :)

最佳答案

您没有说明 datos_trabajadores 何时创建,所以这里有一个触发器,它会在必要时进行检查和创建。我使用了一个简单的计数来检查是否检查 id_tra_rec 和 fecha_rec 是否已经存在——这是一个插入后触发器,所以计数为 1 意味着它是第一个。请注意 debug_table 是用来调试的,您应该在满意时将其删除。

drop table if exists datos_recogida,datos_trabajadores;
create table datos_trabajadores
( id_tra int(11) auto_increment primary key,
nombre_tra varchar(100) ,
apellidos_tra varchar(100) ,
dni_tra varchar(1000) ,
telefono_tra int(10) ,
falta_tra date ,
dias_tra int(255) )
;
create table datos_recogida
( id_rec int(11) auto_increment primary key,
id_tra_rec int(11) ,
id_var_rec int(11) ,
fecha_rec date ,
cantidad_rec int(255) );

drop trigger if exists t;
delimiter $$

create trigger t after insert on datos_recogida
for each row
begin
if (select count(*) from datos_recogida where id_tra_rec = new.id_tra_rec and fecha_rec = new.fecha_rec) = 1 then
insert into debug_table(msg) values (concat('not found:',new.id_tra_rec,':',new.fecha_rec));
if not exists(select 1 from datos_trabajadores where dias_tra = new.id_tra_rec) then
insert into debug_table(msg) values ('inserting');
insert into datos_trabajadores(dias_tra,nombre_tra) values (new.id_tra_rec,1);
else
insert into debug_table(msg) values ('Updating');
update datos_trabajadores
set nombre_tra = nombre_tra + 1
where dias_tra = new.id_tra_rec;
end if;
end if;

end $$
delimiter ;

truncate table debug_table;
truncate table datos_recogida;
truncate table datos_trabajadores;

insert into datos_recogida (id_tra_rec,fecha_rec)
values
(1,'2019-01-01'),
(1,'2019-01-01'),
(1,'2019-01-02');

select * from debug_table;
select * from datos_trabajadores;

MariaDB [sandbox]> select * from debug_table;
+----+------------------------+------+
| id | msg | MSG2 |
+----+------------------------+------+
| 1 | not found:1:2019-01-01 | NULL |
| 2 | inserting | NULL |
| 3 | not found:1:2019-01-02 | NULL |
| 4 | Updating | NULL |
+----+------------------------+------+
4 rows in set (0.00 sec)

MariaDB [sandbox]> select * from datos_trabajadores;
+--------+------------+---------------+---------+--------------+-----------+----------+
| id_tra | nombre_tra | apellidos_tra | dni_tra | telefono_tra | falta_tra | dias_tra |
+--------+------------+---------------+---------+--------------+-----------+----------+
| 1 | 2 | NULL | NULL | NULL | NULL | 1 |
+--------+------------+---------------+---------+--------------+-----------+----------+
1 row in set (0.00 sec)

关于mysql - 更新触发器不同日期,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56053888/

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