在SQL Server 中,BEFORE INSERT 触发器用于在数据插入到表中之前执行一些操作。然而,SQL Server 并不直接支持 BEFORE INSERT 触发器,它只支持 AFTER INSERT 触发器。不过,你可以通过一些替代方案来实现类似 BEFORE INSERT 触发器的功能。 SQL Server 中的替代方案 使用INSTEAD OF INSERT 触发器: INSTEAD OF INSERT ...
大家都知道SQL Server触发器分为DDL、DML和登录触发器。其中DML触发器对于一个表来说,又可分为Insert、Update、Delete三种触发器。也许触发器的功能作用大家都清楚了,可是大家知道当批量Update或者批量Delete数据的时候,触发器如何工作吗?在这种情况下,触发器不是逐条触发的(也就是说不是删除一条记录的同时,触发器开...
R: 响应动作: 不满足怎么办? 以下是Oracle 的触发器的语法例子, 在SQL server中 语法略有差别, 但是思路一致. .. 创建触发器的基本语法: create trigger trigger_name before| after[insert | delete|update] [of colname] on tablename for each row| for each statement when [search_condition] [statemen...
SQL Server Azure SQL 数据库 Azure SQL 托管实例 创建DML、DDL 或登录触发器。 触发器是一种特殊类型的存储过程,在数据库服务器中发生事件时自动运行。 如果用户尝试通过数据操作语言 (DML) 事件修改数据,DML 触发器运行。 DML 事件是针对表或视图的 INSERT、UPDATE 或 DELETE 语句。 此类触发器在任何有效事件触...
[INSERT] [ , ] [UPDATE] }AS{sql_statement[ ; ] [ ...n ] }<dml_trigger_option>::=[NATIVE_COMPILATION] [SCHEMABINDING] [<EXECUTE AS Clause>]-- Trigger on a CREATE, ALTER, DROP, GRANT, DENY, REVOKE,-- or UPDATE statement (DDL Trigger)ALTERTRIGGERtrigger_nameON{DATABASE|ALLSER...
create [or replace] trigger 触发器名 触发时间 {before | after} -- view 中是 instead of 触发事件 { insert | update | delete} -- dml、ddl、database on 触发对象 -- table、view、schema、database 触发频率 { for each row} -- 行级触发器。默认:语句级触发器 [follows 其它触发器名] -- ...
If updates are made by an INSTEAD OF trigger to underlying tables, the updates occur before any AFTER triggers defined on the table are fired. For example, if an INSTEAD OF INSERT trigger on a view inserts data into a base table and the base table itself contains an INSTEAD OF INSERT ...
SQL Server DDL 触发器(Trigger)-- 创建数据库级别的DDL触发器 以下针对某个数据库在创建数据表时调用触发器,并将创建该数据表的用户账户写入到Windows的Event Log中。 CREATETRIGGERreminderONDATABASEFORCREATE_TABLEASDECLARE@strNVARCHAR(100)SET@str=suser_sname()+N'create a new table'RAISERROR(@str,10,1...
GranularityActivation timeTriggering SQL operationTransition variables allowed1Transition tables allowed1 FOR EACH ROW BEFORE DELETE OLD None INSERT NEW None UPDATE OLD, NEW None AFTER DELETE OLD OLD_TABLE INSERT NEW NEW_TABLE UPDATE OLD, NEW OLD_TABLE, NEW_TABLE INSTEAD OF DELETE OLD OLD_TABLE IN...
There are two very special tables that can exist only within triggers: the inserted and deleted tables. These tables are used to store the before and after state of the table that was affected by the INSERT, UPDATE, or DELETE statement that caused the trigger to fire in the first place....