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26
4
触发器是与表有关的数据库对象，指在insert/update/delete之前或者之后，触发并执行触发器中定义的sql语句集合，触发器的这种特性可以协助应用在数据库端确保数据的完整性，日志记录，数据校验等操作.
使用别名old和new来引用触发器中发生变化的记录内容，这与其他的数据库是相似的，现在触发器还只支持行级触发，不支持语句级触发.
。
。
create
trigger
trigger_name
before
/
after
insert
/
update
/
delete
on
tb_name
for
each row
begin
trigger_stmt;
end
;
show triggers;
drop
trigger
[
schema_name.
]
trigger_name;
--
如果没有指定schema_name，默认为当前数据库
。
通过触发器记录student表的数据插入时，将变更日志插入到日志表student_logs中； 。
mysql
>
create
table
student_logs(
->
id
int
primary
key
auto_increment,
->
operation
varchar
(
20
) comment "操作类型,
insert
/
update
/
delete
",
->
operate_time
datetime
comment "操作时间",
->
operate_id
int
comment "操作的ID",
->
operate_params
varchar
(
500
) comment "操作参数"
->
)comment "student操作日志表";
Query OK,
0
rows affected (
1.18
sec)
mysql
>
delimiter
&
mysql
>
create
trigger
student_insert_trigger
->
after
insert
on
student
for
each row
->
begin
->
insert
into
student_logs(id,operation,operate_time,operate_id,operate_params)
values
(
null
,
'
insert
'
, now(), new.id, concat("插入的数据内容为：id
=
",new.id,"name
=
",new.name,"age
=
",new.age,"score
=
",new.score));
->
end
;
->&
Query OK,
0
rows affected (
0.20
sec)
说明1：delimiter &在之前的文章中已经提到过，是将mysql中的语句终止符由“；” 改为“&”,原因是，触发器中有完整的sql语句，会包含分号，如果不改，怎无法在终端中书写完整的触发器语句 。
mysql
>
delimiter ;
mysql
>
show triggers;
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
|
Trigger
|
Event
|
Table
|
Statement
|
Timing
|
Created
|
sql_mode
|
Definer
|
character_set_client
|
collation_connection
|
Database
Collation
|
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
|
student_insert_trigger
|
INSERT
|
student
|
begin
insert
into
student_logs(id,operation,operate_time,operate_id,operate_params)
values
(
null
,
'
insert
'
, now(), new.id, concat("插入的数据内容为：id
=
",new.id,"name
=
",new.name,"age
=
",new.age,"score
=
",new.score));
end
|
AFTER
|
2023
-
08
-
16
00
:
07
:
46.53
|
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
|
skip
-
grants
user
@skip
-
grants host
|
utf8mb4
|
utf8mb4_0900_ai_ci
|
utf8mb4_0900_ai_ci
|
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
1
row
in
set
(
0.00
sec)
说明2：delimiter是将sql语句终止符由“&”在改为“；” 。
mysql
>
insert
into
student(id,name,age,score)
values
(
null
,"李白",
30
,
100
);
Query OK,
1
row affected (
0.21
sec)
mysql
>
select
*
from
student_logs;
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------+
|
id
|
operation
|
operate_time
|
operate_id
|
operate_params
|
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------+
|
1
|
insert
|
2023
-
08
-
16
00
:
21
:
47
|
5
|
插入的数据内容为：id
=
5name
=
李白age
=
30score
=
100
|
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------+
1
row
in
set
(
0.00
sec)
说明3：插入数据李白的信息就已经自动的在student_logs中记录 。
mysql
>
delimiter
&
mysql
>
create
trigger
student_update_trigger after
update
on
student
for
each row
begin
insert
into
student_logs(id, operation, operate_time,operate_id,operate_params)
values
(
null
,
'
update
'
,now(),new_id,concat(
'
更新前数据：id=
'
,old.id,
'
,name=
'
,old.name,
'
,age=
'
,old.age,
'
,score=
'
,old.score,
'
| 更新后数据：id=
'
,new.id,
'
,name=
'
,new.name,
'
,age=
'
,new.age,
'
,score=
'
,new.score));
end
;
&
Query OK,
0
rows affected (1
.86
sec)
mysql
>
delimiter ;
mysql
>
show triggers;
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
|
Trigger
|
Event
|
Table
|
Statement
|
Timing
|
Created
|
sql_mode
|
Definer
|
character_set_client
|
collation_connection
|
Database
Collation
|
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
|
student_insert_trigger
|
INSERT
|
student
|
begin
insert
into
student_logs(id,operation,operate_time,operate_id,operate_params)
values
(
null
,
'
insert
'
, now(), new.id, concat("插入的数据内容为：id
=
",new.id,"name
=
",new.name,"age
=
",new.age,"score
=
",new.score));
end
|
AFTER
|
2023
-
08
-
16
00
:
07
:
46.53
|
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
|
skip
-
grants
user
@skip
-
grants host
|
utf8mb4
|
utf8mb4_0900_ai_ci
|
utf8mb4_0900_ai_ci
|
|
student_update_trigger
|
UPDATE
|
student
|
begin
insert
into
student_logs(id, operation, operate_time,operate_id,operate_params)
values
(
null
,
'
update
'
,now(),new.id,concat(
'
更新前数据：id=
'
,old.id,
'
,name=
'
,old.name,
'
,age=
'
,old.age,
'
,score=
'
,old.score,
'
| 更新后数据：id=
'
,new.id,
'
,name=
'
,new.name,
'
,age=
'
,new.age,
'
,score=
'
,new.score));
end
|
AFTER
|
2023
-
08
-
16
23
:
38
:
26.36
|
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
|
skip
-
grants
user
@skip
-
grants host
|
utf8mb4
|
utf8mb4_0900_ai_ci
|
utf8mb4_0900_ai_ci
|
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
2
rows
in
set
(
1.16
sec)
mysql
>
select
*
from
student;
+
--
--+--------+------+-------+
|
id
|
name
|
age
|
score
|
+
--
--+--------+------+-------+
|
1
|
张三
|
18
|
88
|
|
2
|
李四
|
21
|
83
|
|
3
|
王五
|
24
|
76
|
|
4
|
赵六
|
19
|
94
|
|
5
|
李白
|
30
|
100
|
+
--
--+--------+------+-------+
5
rows
in
set
(
1.30
sec)
mysql
>
update
student
set
age
=
25
where
id
=
5
;
Query OK,
1
row affected (
0.38
sec)
Rows matched:
1
Changed:
1
Warnings:
0
mysql
>
select
*
from
student;
+
--
--+--------+------+-------+
|
id
|
name
|
age
|
score
|
+
--
--+--------+------+-------+
|
1
|
张三
|
18
|
88
|
|
2
|
李四
|
21
|
83
|
|
3
|
王五
|
24
|
76
|
|
4
|
赵六
|
19
|
94
|
|
5
|
李白
|
25
|
100
|
+
--
--+--------+------+-------+
5
rows
in
set
(
0.00
sec)
mysql
>
select
*
from
student_logs;
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------------------------------------------------------+
|
id
|
operation
|
operate_time
|
operate_id
|
operate_params
|
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------------------------------------------------------+
|
1
|
insert
|
2023
-
08
-
16
00
:
21
:
47
|
5
|
插入的数据内容为：id
=
5name
=
李白age
=
30score
=
100
|
|
2
|
update
|
2023
-
08
-
16
23
:
58
:
23
|
5
|
更新前数据：id
=
5
,name
=
李白,age
=
30
,score
=
100
|
更新后数据：id
=
5
,name
=
李白,age
=
25
,score
=
100
|
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------------------------------------------------------+
2
rows
in
set
(
0.00
sec)
。
mysql
>
delimiter
&
mysql
>
create
trigger
student_delete_trigger after
delete
on
student
for
each row
begin
insert
into
student_logs(id,operation,operate_time,operate_id,operate_params)
values
(
null
,
'
delete
'
,now(),old.id, concat(
'
删除之前的数据：id=
'
,old.id,
'
,name=
'
,old.name,
'
,age=
'
,old.age,
'
,score=
'
,old.score));
end
;
&
Query OK,
0
rows affected (
0.87
sec)
mysql
>
show triggers;
->
&
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
|
Trigger
|
Event
|
Table
|
Statement
|
Timing
|
Created
|
sql_mode
|
Definer
|
character_set_client
|
collation_connection
|
Database
Collation
|
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
|
student_insert_trigger
|
INSERT
|
student
|
begin
insert
into
student_logs(id,operation,operate_time,operate_id,operate_params)
values
(
null
,
'
insert
'
, now(), new.id, concat("插入的数据内容为：id
=
",new.id,"name
=
",new.name,"age
=
",new.age,"score
=
",new.score));
end
|
AFTER
|
2023
-
08
-
16
00
:
07
:
46.53
|
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
|
skip
-
grants
user
@skip
-
grants host
|
utf8mb4
|
utf8mb4_0900_ai_ci
|
utf8mb4_0900_ai_ci
|
|
student_update_trigger
|
UPDATE
|
student
|
begin
insert
into
student_logs(id, operation, operate_time,operate_id,operate_params)
values
(
null
,
'
update
'
,now(),new.id,concat(
'
更新前数据：id=
'
,old.id,
'
,name=
'
,old.name,
'
,age=
'
,old.age,
'
,score=
'
,old.score,
'
| 更新后数据：id=
'
,new.id,
'
,name=
'
,new.name,
'
,age=
'
,new.age,
'
,score=
'
,new.score));
end
|
AFTER
|
2023
-
08
-
16
23
:
57
:
34.20
|
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
|
skip
-
grants
user
@skip
-
grants host
|
utf8mb4
|
utf8mb4_0900_ai_ci
|
utf8mb4_0900_ai_ci
|
|
student_delete_trigger
|
DELETE
|
student
|
begin
insert
into
student_logs(id,operation,operate_time,operate_id,operate_params)
values
(
null
,
'
delete
'
,now(),old.id, concat(
'
删除之前的数据：id=
'
,old.id,
'
,name=
'
,old.name,
'
,age=
'
,old.age,
'
,score=
'
,old.score));
end
|
AFTER
|
2023
-
08
-
17
00
:
15
:
46.44
|
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
|
skip
-
grants
user
@skip
-
grants host
|
utf8mb4
|
utf8mb4_0900_ai_ci
|
utf8mb4_0900_ai_ci
|
+
--
----------------------+--------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------+------------------------+-----------------------------------------------------------------------------------------------------------------------+-----------------------------------+----------------------+----------------------+--------------------+
3
rows
in
set
(
0.00
sec)
mysql
>
delimiter ;
mysql
>
delete
from
student
where
id
=
5
;
Query OK,
1
row affected (
0.70
sec)
mysql
>
select
*
from
student;
+
--
--+--------+------+-------+
|
id
|
name
|
age
|
score
|
+
--
--+--------+------+-------+
|
1
|
张三
|
18
|
88
|
|
2
|
李四
|
21
|
83
|
|
3
|
王五
|
24
|
76
|
|
4
|
赵六
|
19
|
94
|
+
--
--+--------+------+-------+
4
rows
in
set
(
0.00
sec)
mysql
>
select
*
from
student_logs;
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------------------------------------------------------+
|
id
|
operation
|
operate_time
|
operate_id
|
operate_params
|
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------------------------------------------------------+
|
1
|
insert
|
2023
-
08
-
16
00
:
21
:
47
|
5
|
插入的数据内容为：id
=
5name
=
李白age
=
30score
=
100
|
|
2
|
update
|
2023
-
08
-
16
23
:
58
:
23
|
5
|
更新前数据：id
=
5
,name
=
李白,age
=
30
,score
=
100
|
更新后数据：id
=
5
,name
=
李白,age
=
25
,score
=
100
|
|
3
|
delete
|
2023
-
08
-
17
00
:
18
:
06
|
5
|
删除之前的数据：id
=
5
,name
=
李白,age
=
25
,score
=
100
|
+
--
--+-----------+---------------------+------------+-----------------------------------------------------------------------------------------------------------+
3
rows
in
set
(
0.00
sec)
。
最后此篇关于Mysql高级8-触发器的文章就讲到这里了,如果你想了解更多关于Mysql高级8-触发器的内容请搜索CFSDN的文章或继续浏览相关文章，希望大家以后支持我的博客！ 。
26
4
0
概述 触发器是 MySQL 的数据库对象之一，不需要程序调用或手工启动，而是由事件来触发、激活，从而实现执行，包括 INSERT 语句、UPDATE 语句和 DELETE 语句 创建触发器 1. 创建
当我为单元格获得的值是某种类型时，我试图设置一个触发器来显示文本块。 我已经成功地设法在相同的情况下显示图像，但在这种情况下我不需要图像，而是一些文本。 已注释掉行以进行测试。尝试使其工作。注释掉的代
我需要在 phpmyadmin 中为 2 个表创建一个触发器。 所以有表 stores 和 tbl_storefinder_stores。 我想从 stores 表中插入 4 个东西(名称、地址、经度
阅读目录 1、触发器 2、触发器类型 3、触发器语法 4、插入数据触发器案例 5、修改数据触发器案例
SQLite 触发器（Trigger） SQLite 的触发器是数据库的回调函数，它会在指定的数据库事件发生时自动执行/调用。以下是关于SQLite的触发器的要点：SQLite **触发器（Trig
请帮我写一个向表中添加新行的触发器。 我的数据库中有 3 个表: 地区(id，名字)； id - 主要； 技术人员(身份证、姓名)； id - 主要； 可用性(id、区域、技术、计数)； id - p
我正在编写一个触发器来审核表中的更新和删除。我正在使用 SQL Server 2008 我的问题是， 有没有办法在不经过删除和插入表的选择阶段的情况下找出对记录采取的操作？ 另一个问题是，如果记录被删
我的表: TableA (id number, state number) TableB (id number, tableAId number, state number) TableC (id n
我很少写触发器。我可以帮助设置这件事。 CREATE TRIGGER audit_tableName ON dbo.tableNameAudit AFTER CREATE, UPDATE, DELET
我之前从未在 Oracle 中创建过触发器，所以我正在寻找一些方向。 如果 ID 不在插入语句中，我想创建一个将 ID 增加 1 的触发器。 ID 应该从 10000 开始，当插入一条记录时，下一个
考虑以下两个(假设的)表 温度 * day * time * lake_name * station * temperature_f 温度_总结 * day * lake_name * station
如何在 SQL 触发器中获取更新记录的值 - 如下所示: CREATE TRIGGER TR_UpdateNew ON Users AFTER UPDATE AS BEGIN S
我是 Cassandra 新手，使用 Cassandra 3.10 并有类似的表格 create table db1.table1 (id text, trip_id text, event_time
在 MSSQL 中执行 TRUNCATE(而不是删除)时如何触发触发器 最佳答案 来自msdn : TRUNCATE TABLE cannot activate a trigger because t
我正在尝试在 sql developer 中创建一个简单的触发器，以在工资发生变化时显示工资的变化 CREATE OR REPLACE TRIGGER salary_changes BEFORE DE
我有三个表: Table1: Customers (CustomerId, Name, CustomerAddress) Table2: AccountManagers(ManagerId, Name
在 Sql Server 2005 触发器中有没有办法在执行期间获取触发器附加到的表的名称和架构？ 最佳答案 SELECT OBJECT_NAME(parent_id) AS [Table],
使用 MySQL 5.5，以下触发器因错误而被拒绝: create trigger nodups before insert on `category-category` for each row b
我使用 fancybox 打开一个带有表单的弹出窗口。目前，当鼠标离开主页时，弹出窗口就会出现。为了完成这项工作，我有一个隐藏的链接标签，我用trigger()函数模拟它，单击该函数，以便该链接的hr
我的触发器触发 INSERT, UPDATE and DELETE .我需要根据触发触发器的操作从适当的内存表( inserted, deleted )插入。由于只有 inserted位于 INSER
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