登录触发器:与SQL Server实例建立用户会话时将引发此事件。 注意:登录触发器将在登录的身份验证阶段完成之后且用户会话实际建立之前激发。 定义DML触发器-使用T-SQL 定义DML触发器 CREATETRIGGER触发器名ON表|视图 [WITH选项]FORAFTER|INSTEADOF[INSERT|DELETE|UPDATE]ASBEGIN-- SQL语句END 说明:如果是INSTEAD OF类型...
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...
Weitere Informationen zum Programmieren von Triggern in der CLR finden Sie unter CLR-Trigger. Kompilieren Sie dann die Klasse, um eine Assembly in .NET Framework mit dem entsprechenden Sprachcompiler zu erstellen. Registrieren Sie die Assembly in SQL Server mithilfe der CREATE ASSEMBLY-Anweisung...
SQL USEAdventureWorks2022; GO IF OBJECT_ID ('Purchasing.LowCredit','TR') IS NOT NULLDROPTRIGGERPurchasing.LowCredit; GO-- This trigger prevents a row from being inserted in the Purchasing.PurchaseOrderHeader table-- when the credit rating of the specified vendor is set to 5 (below average)...
“Unable to enlist in the transaction” with Oracle linked server from MS SQL Server [<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source nam...
Applies to:SQL Server This article describes how to configure thenested triggersserver configuration option in SQL Server by using SQL Server Management Studio or Transact-SQL. Thenested triggersoption controls whether anAFTERtrigger can cascade. That is, perform an action that initiates another trigg...
適用於:SQL Server .NET Framework Common Language Runtime (CLR) SqlTriggerContext 類別提供觸發程式的內容資訊。 此內容資訊包含導致觸發程式引發的動作類型、哪些數據行在 UPDATE 作業中修改,以及使用數據定義語言 (DDL) 觸發程式,XML EventData 結構來描述觸發作業。 如需如何使用 類別的詳細資訊和...
(从 SQL Server 2016 (13.x) 开始,可使用 DROP TRIGGER IF EXISTS 语法。) SQL 复制 IF OBJECT_ID ('employee_insupd', 'TR') IS NOT NULL DROP TRIGGER employee_insupd; B. 删除 DDL 触发器 以下示例将删除 DDL 触发器 safety。 重要 因为DDL 触发器不在架构范围内,所以不会在 sys.objects ...
SQL Server Azure SQL Managed Instance Logon triggers fire stored procedures in response to aLOGONevent. This event is raised when a user session is established with an instance of SQL Server. Logon triggers fire after the authentication phase of logging in finishes, but before the user sessio...
Use the inserted and deleted tables in INSTEAD OF triggers Performance considerations Next steps Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance DML trigger statements use two special tables: the deleted and inserted tables. SQL Server automatically creates and manages these ...