Triggers in SQL Server - Learn about SQL Server triggers, their purpose, types, and benefits. Understand DML and DDL triggers with practical use cases.
使用createtrigger命令创建DDL触发器的语法形式如下: Create trigger trigger_name on {all server|database}[with<ddl_trigger_option> [ ,...n ]] {for|after} {event_type|event_group}[,...n] AS {sql_statement[;] [...n]|external name<method specifier>[;]} 其中: <ddl_trigger_option>::=...
SQL Server 2005 Logon Triggers by Frederik Vandeputte as SSCLogon triggers by Cristian Lefter as Simple-talk
使用createtrigger命令创建DDL触发器的语法形式如下: Create trigger trigger_name on {all server|database}[with<ddl_trigger_option> [ ,...n ]] {for|after} {event_type|event_group}[,...n] AS {sql_statement[;] [...n]|external name<method specifier>[;]} 其中: <ddl_trigger_option>::=...
Sample SQL Server DML Trigger Let’s suppose that we have a database for the human resource department. This database contains a table Employees to keep personnel information and salaries. With the help of a trigger we can keep an audit record in a separate table that contains each record ...
1.DB object:database, schema, table, column, view, index, sequence, function, trigger 等名称: 建议使用小写字母、数字、下划线的组合。 建议不使用双引号即"包围,除非必须包含大写字母或空格等特殊字符。 长度不能超过63个字符。 不建议以pg_开头或者pgxc_(避免与系统 DB object 混淆),不建议以数字开头。
CREATE TRIGGER trig_update_bank ON bank FOR UPDATE AS 从deleted表中获取交易 前的余额,从inserted表 中获取交易后的余额 DECLARE @beforeMoney MONEY,@afterMoney MONEY SELECT @beforeMoney=currentMoney FROM deleted SELECT @afterMoney=currentMoney FROM inserted IF ABS(@afterMoney-@beforeMoney)>20000 交易...
Triggers help the database designer ensure certain actions, such as maintaining an audit file, are completed regardless of which program or user makes changes to the data. The programs are called triggers since an event, such as adding a record to a table, fires their execution. ...
然而,陳述式指定 RESTRICT WHEN DELETE TRIGGERS(隱含或明示)。當要截斷的表格有 DELETE 觸發程式存在,且 TRUNCATE 陳述式的結果會啟動觸發程式時,便可能發生這種情況。 要截斷的表格是參照限制中的母表格。 無法處理該陳述式。 使用者回應 如果陳述式由於 DELETE 觸發程式的存在而失敗,請在 TRUNCATE 陳述式上指定 ...
ON sc FOR INSERT, UPDATE, DELETE AS PRINT ‘inserted表:’ Select * from inserted PRINT ‘deleted表:’ Select * from deleted Go 【例10-2】 创建一个触发器,在 s 表上创建一个插入、更新类型的触发器。 程序清单如下: create trigger tr_s ...