create trigger db_trigger2 on 仓库备份 for Insert,Update ,Delete as begin execute xp_sendmail 'zhoufeng@163.com' end --禁用和启用触发器 --disable 禁用;Enable 启用 alter table 仓库备份 disable trigger db_trigger1 alter table 仓库备份 Enable trigger db_trigger1 alter table 仓库备份 disable trig...
Triggers are enabled by default when they are created. Disabling a trigger does not drop it. The trigger still exists as an object in the current database. However, the trigger does not fire when any Transact-SQL statements on which it was programmed are executed. Triggers can be re-enabl...
create trigger tr on 表名 for update as if update(userName) rollback tran 关键在最后两句,其解释为:如果更新了 userName 列,就回滚事务。 十、禁用、启用触发器 禁用:alter table 表名 disable trigger 触发器名称 启用:alter table 表名 enable trigger 触发器名称 如果有多个触发器,则各个触发器名称之间...
IF EXISTS (SELECT * FROM sys.triggers WHERE parent_class = 0 AND name = 'safety') DROP TRIGGER safety ON DATABASE; GO CREATE TRIGGER safety ON DATABASE FOR DROP_TABLE, ALTER_TABLE AS PRINT 'You must disable Trigger "safety" to drop or alter tables!' ROLLBACK; GO DISABLE TRIGGER safe...
create trigger f on tbl instead of delete as insert into Logs... IF UPDATE(列名) 检查是否更新了某一列,用于 insert 或 update,不能用于 delete。例: create trigger f on tbl for update as if update(status) or update(title) sql_statement --更新了 status 或 title 列 ...
create trigger tgr_name on table_name with encrypion –加密触发器 for update... as Transact-SQL 1. 2. 3. 4. 5. 6. 创建insert类型触发器 --创建insert插入类型触发器 if (object_id('tgr_classes_insert', 'tr') is not null) drop trigger tgr_classes_insert ...
[ ; ] -- Trigger on a CREATE, ALTER, DROP, GRANT, DENY, REVOKE or UPDATE statement (DDL Trigger) DROP TRIGGER [ IF EXISTS ] trigger_name [ ,...n ] ON { DATABASE | ALL SERVER } [ ; ] -- Trigger on a LOGON event (Logon Trigger) DROP TRIGGER [ IF EXISTS ] trigger_name ...
If not exists(select sno from s where s.sno=@bh) Delete sc where sno=@bh end 使用INSERT触发器 例10-4创建一个触发器,当插入或更新成绩列时,该触发器检查插入的数据是否处于设定的范围内。 程序清单如下: Create trigger sc_insupd on sc
以下示例将删除 AdventureWorks2022 数据库中的employee_insupd触发器。 (从 SQL Server 2016 (13.x) 开始,可使用 DROP TRIGGER IF EXISTS 语法。) SQL IF OBJECT_ID ('employee_insupd', 'TR') IS NOT NULLDROPTRIGGERemployee_insupd; B. 删除 DDL 触发器 ...
(below average).CREATETRIGGERPurchasing.LowCreditONPurchasing.PurchaseOrderHeaderAFTERINSERTASIF(ROWCOUNT_BIG() =0)RETURN; IF EXISTS (SELECT1FROMinsertedASiJOINPurchasing.VendorASvONv.BusinessEntityID = i.VendorIDWHEREv.CreditRating =5)BEGINRAISERROR ('A vendor''s credit rating is too low to ...