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发时触发,无论表行是否受影响。 有关详细信息,请参阅DML Triggers。
In this article Recursive Triggers Examples See Also Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Both DML and DDL triggers are nested when a trigger performs an action that initiates another trigger. These actions can initiate other triggers, and so on. DML and DDL ...
(1 row(s) affected) Test1Col --- 1 (1 row(s) affected) Test2Col --- 2 當您建立本機或全域臨時表時,CREATE TABLE 語法支援條件約束定義,但 FOREIGN KEY 條件約束除外。 如果在臨時表中指定了 FOREIGN KEY 條件約束,語句會傳回警告訊息,指出已略過條件約束。 數據表仍會建立,而不需要 FOREIGN KEY...
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第二十一章 SQL命令 CREATE TRIGGER(一) 创建触发器 大纲 CREATETRIGGER trigname{BEFORE|AFTER}event[,event] [ORDERinteger] ONtable [REFERENCING{OLD|NEW}[ROW][AS]alias] action 1. 2. 3. 4. 5. 参数 trigname - 要创建的触发器的名称,它是一个标识符。触发器名称可以是限定的,也...
Cross-database referential integrity must be implemented through triggers. For more information, see CREATE TRIGGER. FOREIGN KEY constraints can reference another column in the same table. This is referred to as a self-reference. The REFERENCES clause of a column-level FOREIGN KEY constraint can ...
FL 500The CREATE TRIGGER (advanced) statement defines an advanced trigger in a schema and builds a trigger package at the current server. Each time that the trigger activates, the trigger package executes one or more times.
程序集:Microsoft.SqlServer.TransactSql.ScriptDom(在 Microsoft.SqlServer.TransactSql.ScriptDom.dll 中) 语法 C# [SerializableAttribute]publicclassCreateTriggerStatement:TriggerStatementBody CreateTriggerStatement 类型公开以下成员。 构造函数 名称说明 CreateTriggerStatementInitializes a new instance of the Create...
CREATE TRIGGER (Transact-SQL) Creates a DML, DDL, or logon trigger. A trigger is a special kind of stored procedure that automatically executes when an event occurs in the database server. DML triggers execute when a user tries to modify data through a data manipulation language (DML) even...
For as many times as I have read about sending e-mails using SQL Server triggers, I've rarely come across actual code samples. After someone asked for a "Triggers for Dummies" example in a Facebook SQL group, I created the following example which uses a trigger to alert a manager that...