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SQL Server 2008 supports the EXEC AT syntax, which allows you to invoke dynamic pass-through code against a linked server . In certain cases this feature is preferable to the alternative method of submitting pass-through code against linked servers using the OPENQUERY table function . OPENQUERY has several limitations: the input query string

must be static it can t be a variable and it can t accept input arguments . Furthermore, you invoke OPENQUERY in the FROM clause of an outer query, so the function must represent a table . This requirement is very limiting when you just want to invoke executable code against the target server; for example, DDL statements . Similar limitations apply to the OPENROWSET table function . For details about the OPENQUERY and OPENROWSET functions, please refer to SQL Server Books Online . All these limitations are addressed by the EXEC AT command . To see the capabilities of the EXEC AT command, from a SQL Server 2008 instance, create a linked server to another SQL Server instance to which you have access, for example, a local instance of SQL Server Express . I will use a linked server called Dojo in my examples:

EXEC sp_addlinkedserver [Dojo], 'SQL Server';

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If you were to port this code to another application server or choose to use another SOAP server, this code would have to be modified There are two other lines in the getWebService method that require further explanation The first line in the method refers to a class called CommonIssues There are two methods for invoking an RPC-style web service You may use a static client to invoke a web service if you have the interfaces to the EJB, parameters, and return types associated with the web service If not, you may write a dynamic client, which does not explicitly reference those classes in your code In our case, Amaya implemented their web service using a stateless session bean called CommonIssuesBean They have provided us with the interface and as a result, we have written our getWebService as a static client.

The following example shows how you can use input parameters in the input string:

In this exercise, you will sign into MSN Messenger, customize your name, select a personalized picture, and then add a contact.

EXEC ( 'SELECT productid, productname, unitprice FROM InsideTSQL2008.Production.Products WHERE ProductID = ;', 3 ) AT [Dojo];

I m assuming in this example that the InsideTSQL2008 database exists in the target server, and permissions were set to allow access to the target linked server . EXEC invokes a query against Dojo, which returns the product details of a specified product ID (3 in this case):

The question mark is replaced with the specified input value . The input value doesn t have to be a constant; it can be a variable:

Our reference to the CommonIssues class is a reference to the remote interface of their bean Finally, we provide a URL for Amaya s web service The URL begins with http://localhost This enables you to run the case study on one machine As we will see when we deploy the application, the Amaya web service is running as a separate application If you choose to deploy that portion of the application to another machine, merely change the URL in the ComponentLocator class to point to the appropriate location for the WSDL..

DECLARE @pid AS INT; SET @pid = 3; EXEC ( 'SELECT productid, productname, unitprice FROM InsideTSQL2008.Production.Products WHERE ProductID = ;', @pid ) AT [Dojo];

In fact, even the input code string can be a variable, which you construct dynamically:

FROM InsideTSQL2008.Production.Products WHERE ProductID = ;' SET @pid = 3; EXEC(@sql, @pid) AT [Dojo];

The BugAccessorBean is responsible for accessing our partner web services and updating the list of common problems associated with each computer we repair. It uses the ComponentLocator to locate the web service and then requests the

Furthermore, EXEC doesn t have to return a table result . The following example creates a table called T1 in tempdb at Dojo:

EXEC ( 'USE tempdb; IF OBJECT_ID(''dbo.T1'', ''U'') IS NOT NULL DROP TABLE dbo.T1; CREATE TABLE dbo.T1 ( keycol INT NOT NULL PRIMARY KEY, datacol VARCHAR(10) NOT NULL );' ) AT [Dojo];

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