mysql触发器实例 删除触发器
发布时间：2022-10-24 11:20:50 所属栏目：MySql教程 来源：
导读： mysql> CREATE TABLE Employee( //创建测试用的数据表
-> id int,
-> first_name VARCHAR(15),
-> last_name VARCHAR(15),
-> start_date DATE,
-> end_date DATE,
-> id int,
-> first_name VARCHAR(15),
-> last_name VARCHAR(15),
-> start_date DATE,
-> end_date DATE,
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mysql> CREATE TABLE Employee( //创建测试用的数据表 -> id int, -> first_name VARCHAR(15), -> last_name VARCHAR(15), -> start_date DATE, -> end_date DATE, -> salary FLOAT(8,2), -> city VARCHAR(10), -> description VARCHAR(15) -> ); Query OK, 0 rows affected (0.03 sec) mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values (1,'Jason', 'Martin', '19960725', '20060725', 1234.56, 'Toronto', 'Programmer'); Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values(2,'Alison', 'Mathews', '19760321', '19860221', 6661.78, 'Vancouver','Tester'); Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values(3,'James', 'Smith', '19781212', '19900315', 6544.78, 'Vancouver','Tester'); Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values(4,'Celia', 'Rice', '19821024', '19990421', 2344.78, 'Vancouver','Manager'); Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values(5,'Robert', 'Black', '19840115', '19980808', 2334.78, 'Vancouver','Tester'); Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values(6,'Linda', 'Green', '19870730', '19960104', 4322.78,'New York', 'Tester'); Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values(7,'David', 'Larry', '19901231', '19980212', 7897.78,'New York', 'Manager'); Query OK, 1 row affected (0.02 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) -> values(8,'James', 'Cat', '19960917', '20020415', 1232.78,'Vancouver', 'Tester'); Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> DELIMITER // mysql> mysql> CREATE TRIGGER myTrigger BEFORE UPDATE ON employee //创建mysql触发器 -> FOR EACH ROW -> BEGIN -> -> IF NEW.id > 5 THEN -> SET NEW.first_name = NEW.first_name+ " *"; -> END IF; -> -> IF NEW.salary IS NULL OR NEW.salary = 0 THEN -> SET NEW.salary = 100; -> ELSE -> SET NEW.salary = NEW.salary + 100; -> END IF; -> -> END -> -> // Query OK, 0 rows affected (0.02 sec) mysql> DELIMITER ; mysql> mysql> SELECT * FROM INFORMATION_SCHEMA.TRIGGERS; +-----------------+----------------+--------------+--------------------+----------------------+---------------------+--------------------+------------- -+------------------+---------------------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------+--------------------+---------------+--------------------------- -+----------------------------+--------------------------+--------------------------+---------+----------+----------------+ | TRIGGER_CATALOG | TRIGGER_SCHEMA | TRIGGER_NAME | EVENT_MANIPULATION | EVENT_OBJECT_CATALOG | EVENT_OBJECT_SCHEMA | EVENT_OBJECT_TABLE | ACTION_ORDER | ACTION_CONDITION | ACTION_STATEMENT | ACTION_ORIENTATION | ACTION_TIMING | ACTION_REFERENCE_OLD_TABLE | ACTION_REFERENCE_NEW_TABLE | ACTION_REFERENCE_OLD_ROW | ACTION_REFERENCE_NEW_ROW | CREATED | SQL_MODE | DEFINER | +-----------------+----------------+--------------+--------------------+----------------------+---------------------+--------------------+------------- -+------------------+---------------------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------+--------------------+---------------+--------------------------- -+----------------------------+--------------------------+--------------------------+---------+----------+----------------+ | NULL | test | myTrigger | UPDATE | NULL | test | employee | 0 | NULL | BEGIN IF NEW.id > 5 THEN SET NEW.first_name = NEW.first_name+ " *"; END IF; IF NEW.salary IS NULL OR NEW.salary = 0 THEN SET NEW.salary = 100; ELSE SET NEW.salary = NEW.salary + 100; END IF; END | ROW | BEFORE | NULL | NULL | OLD | NEW | NULL | | root@localhost | +-----------------+----------------+--------------+--------------------+----------------------+---------------------+--------------------+------------- -+------------------+---------------------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------+--------------------+---------------+--------------------------- -+----------------------------+--------------------------+--------------------------+---------+----------+----------------+ 1 row in set (0.03 sec) mysql> DROP TRIGGER myTrigger; //删除mysql触发器 Query OK, 0 rows affected (0.00 sec) mysql> SELECT * FROM INFORMATION_SCHEMA.TRIGGERS; //查询触发器系统表，确认触发器是否删除 Empty set (0.02 sec) mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) （编辑：天瑞地安资讯网_瑞安站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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