create or replace trigger 触发器名称 before insert on 表名 for each row declare ...
The syntax to create aBEFORE UPDATE Triggerin Oracle/PLSQL is: CREATE [ OR REPLACE ] TRIGGERtrigger_nameBEFORE UPDATE ONtable_name[ FOR EACH ROW ] DECLARE -- variable declarations BEGIN -- trigger code EXCEPTION WHEN ... -- exception handling END; ...
32.1. 触发器行为概述 一个触发器函数可以再一个INSERT,UPDATE, 或者 DELETE 命令之前或者之后执行,要么是对每个被修改的行一次, 要么是每条 SQL 触发器函数必须在创建触发器之前,作为一个没有参数并且返回trigger类型的函数定义。 (触发器函数通过特殊的 TriggerData 一旦创建了一个合适的触发器函数,触发器就用CREAT...
create trigger t_s_gra before insert on grade for each row begin if new.grade<0 OR new.grade>100 then signal SQLSTATE '45000' set message_text = '分数不合理',MYSQL_ERRNO = 1333; elseif new.grade<60 then set new.remark = 'NO'; else update student set sum_credit = sum_credit + ...
13、SQL-procedure-body：存储过程的主体 例子1：产生一个SQL存储过程，返回员工的平均薪水. 返回...
sql CREATE TRIGGER trgAfterInsertEmployee ON Employee AFTER INSERT AS BEGIN -- 检查插入的数据 IF EXISTS (SELECT * FROM inserted WHERE Salary < 0) BEGIN -- 删除不符合要求的记录 DELETE FROM Employee WHERE EmployeeID IN (SELECT EmployeeID FROM inserted WHERE Salary < 0); -- 记录错误或...
This Oracle tutorial explains how to create a BEFORE INSERT Trigger in Oracle with syntax and examples. A BEFORE INSERT Trigger means that Oracle will fire this trigger before the INSERT operation is executed.
The table has BEFORE INSERT trigger which sets the ‘c1’ column to NOT NULL value (SET NEW.c1 = 1) User executes the SQL statement INSERT INTO t1 VALUES(NULL) that fails with the following error: ERROR 1048 (23000): Column ‘c1’ cannot be null The user will get the same error...
after trigger for each row当一条SQL写入a完成后,触发after触发器,开始处理每行。1、建触发器函数,用于处理每一行原始数据,包括50个处理逻辑.CREATE OR REPLACE FUNCTION notify1() returns trigger AS $function$ declare begin if jsonb_array_element(NEW.att->'price', 0)::text::float8 > 100 then -...
V0244: The specification states the following: Subclause 4.39.1, General description of triggers : The triggered action is specified to