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CREATE TRIGGER [ schema_name . ]trigger_name ON { table | view } [ WITH <dml_trigger_option> [ ,...n ] ] { FOR | AFTER | INSTEAD OF } { [ INSERT ] [ , ] [ UPDATE ] [ , ] [ DELETE ] } [ WITH APPEND ] [ NOT FOR REPLICATION ] AS { sql_statement [ ; ] [ ,...n ] | EXTERNAL NAME <method specifier [ ; ] > }

public string HelloWorld() {

When a trigger is defined as AFTER, the trigger fires after the modification has passed all constraints. If a modification fails a constraint, such as a check constraint, primary key constraint, or foreign key constraint, the trigger is not executed.

return "Hello World";

UpdateRowVersionDisplay();

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This lab steps you through how to create a Web service method. The public method created in this lab is added to the Web service project created in the last lab. If you have not yet completed the steps in Lab 1, you need to do so before continuing on with this lab. If you encounter a problem completing this lab, the completed projects are available on the companion CD in the Code folder. The method created in this lab is named GetVendorList and it returns an XML string containing all active vendors. The vendor data come from the AdventureWorks data base, which is available as a free download with SQL Server Express at http:// www.microsoft.com/downloads/details.aspx FamilyId=E719ECF7-9F46-4312-AF89 6AD8702E4E6E&displaylang=en. You can find helpful instructions on installing the database at http://msdn2.microsoft.com/en-us/library/ms310325.aspx. 1. Open Visual Studio 2005. 2. Click File, Open, Web Site. 3. In the Open Web Site dialog box, browse to the location where the MyWebSer vice project was created in Lab 1. 4. Within the MyWebService.cs or MyWebService.vb file, add the following code right under the class constructor:

AFTER triggers are defined only for tables, and multiple AFTER triggers can be defined for the same action. If you have multiple triggers created for the same action, you can specify the first and last triggers to fire by using the sp_settriggerorder system stored procedure. However, any other triggers for the same action are executed in random order.

'VB <WebMethod(Description:="Retrieve a list of active vendors ordered by name")> _ Public Function GetVendorList() as String

23. Create an event handler for the AcceptChangesButton.Click event and add the fol lowing code:

Dim ret As String = ""

A trigger defined with the INSTEAD OF clause causes the trigger code to be executed as a replacement for INSERT, UPDATE, or DELETE. You can define a single INSTEAD OF trigger for a given action. Although INSTEAD OF triggers can be created against both tables and views, INSTEAD OF triggers are almost always created against views. Regardless of the number of rows that are affected, a trigger fires only once for an action. The NOT FOR REPLICATION option controls the behavior of the trigger when the replication engine is applying changes. By default, any INSERT, UPDATE, or DELETE executed on a subscriber by the replication engine causes the corresponding trigger to fire. If you do not want the triggers on the subscriber to fire when the replication engine is applying changes, you can specify the NOT FOR REPLICATION option. If a change is being made by any process other than the replication engine, the trigger still fires. When a trigger is executed, two special tables named inserted and deleted are available. These are the same inserted and deleted tables that were explained in 2, Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements.

To explain how to call a Web method synchronously, it s beneficial to just show the code to call a Web method first, and then move on to the discussion.

' VB GetSelectedRow().AcceptChanges()

'VB Public Sub GetTickerSymbol()

DDL triggers can execute either when a DDL statement is executed or when the user logs on to the SQL Server instance. The general syntax for creating a DDL trigger is as follows:

Dim Lookup As New StockLookupService()

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