mysql>CREATE TRIGGER double_salary->AFTER INSERT ON tb_emp6->FOR EACH ROW->INSERT INTO tb_emp7-> VALUES (NEW.id,NEW.name,NEW.deptId,2*NEW.salary); Query OK,0rows affected (0.25sec) 触发器 double_salary 创建完成之后,向表 tb_emp6 中插入记录时,同时向表 tb_emp7 中插入相同的记录,并...
mysql> create table teacher_history(idint,old_name varchar(64),new_name varchar(64),old_deptidint,new_deptidint,tstamp timestamp); Query OK,0rows affected (0.16sec) mysql>desc teacher_history;+---+---+---+---+---+---+ | Field | Type | Null | Key | Default | Extra | +--...
SHOW TRIGGERS ステートメント SHOW VARIABLES ステートメント SHOW WARNINGS ステートメント その他の管理ステートメント ユーティリティステートメント MySQL データディクショナリ InnoDB ストレージエンジン 代替ストレージエンジン レプリケーション グループレプリケーシ...
for the trigger I want let's start from DEVICE table with 4 devices and the following shadowtable. BEFORE: A.id | DEVICE ID | ACTION 2 1 I 2 2 U 2 4 U if I delete in the main table A record 2 then shadowtable should be changed to this: ...
Triggers cannot useNEW.col_nameor useOLD.col_nameto refer to generated columns. For information about generated columns, seeSection 13.1.18.7, “CREATE TABLE and Generated Columns”. MySQL stores thesql_modesystem variable setting in effect when a trigger is created, and always executes the trig...
CREATE PROCEDURE GetEmployeeByID(IN empID INT) BEGIN SELECT * FROM Employees WHERE EmployeeID = empID; END; 这段代码创建了一个名为GetEmployeeByID的存储过程,该过程接受一个输入参数empID,并返回对应的员工记录。 七、CREATE TRIGGER:创建触发器
one auto_increment column and getting the error 'Duplicate entry '68256666' for key 1'. These triggers get executed by database operations from more than one MySQL connection i.e parallel operations. I am using the MySQL version 5.1.47 and all my tables are using the InnoDB storage engine...
By default, this variable has a value of 0, but you can change it like this: mysql> SET GLOBAL log_bin_trust_function_creators = 1; Setting log_bin_trust_function_creators=1; fixes the issue, but it's not what the expected by MySQL document explains. mysql [localhost] {root} ((...
context. These statements are also not allowed in a function or trigger because functions and triggers are also considered to be multi-statement transactions. 这种如何解决呢?官方也给出建议:把此类 DDL 语句放在事务块外面或者直接使用基于磁盘表的 DDL 语句来替代它。比如下面示例:在事务外创建临时...
trigger2: THE DIFFICULT ONE (the real hard stuff ;)) Itshould do 3 (insert,update, delete) in pseudo code AFTER DELETE on TABLE foreach device { INTO SHADOW VALUES (old.record, medewerker id ‘D’) WHERE action !