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The trigger first evaluates the number of rows that were affected by the firing statement (INSERT, UPDATE, or MERGE) . If zero rows were modified, the trigger simply terminates . It has nothing to do in such a case . The trigger then checks whether one of the four relevant columns (arg1, arg2, arg3, computation) was modified, using the COLUMNS_UPDATED() function . I described this function in more detail in 4, Triggers . This function returns a bitmap with a representative bit for each column . For an UPDATE statement, the bit is turned on if the corresponding column was specified in the SET clause, and it s turned off if the corresponding column wasn t specified in the SET clause . For an INSERT statement, all column bits are turned on . If none of the relevant columns were modified, the trigger simply terminates . It has no reason to reevaluate the computation if neither the inputs nor the computation changed . If the statement that fired the trigger was an UPDATE statement (or a MERGE statement containing an UPDATE action), and the column result was modified, the trigger generates an error message and rolls back the update . The trigger defines local variables to host the input arguments, the computation, and the result value . Each row must be handled separately, so a cursor is needed if there is more than one row .

<message name="getIssuesListRequest"> Inbound/Outbound <part name="arg0" type="xsd:string" /> message definitions </message> for our RPC service <message name="getIssuesListResponse"> <part name="return" type="dom:org.w3c.dom.Document" /> </message>

For each modified row, the trigger reads the inputs and the computation into its local variables . Notice that the trigger adds a prefix to the computation: N SET @result = + computation . This is a very important trick that allows you to return the result of the computation back to the trigger s local variable (@out_result) through an output parameter (@result) . After reading the inputs and the computation from the current row into the trigger s local variables, the code invokes sp_executesql to evaluate the expression and store it in @out_result through the output parameter @result:

EXEC sp_executesql @comp, @params, @result = @out_result OUTPUT, @arg1 = @in_arg1, @arg2 = @in_arg2, @arg3 = @in_arg3;

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Now that the result is stored in the @result variable, the trigger updates the corresponding row in the Computations table with the result value . To test the trigger, issue the following INSERT statements and query the Computations table:

INSERT INTO dbo.Computations(arg1, arg2, arg3, computation) VALUES (1, 2, 3, '@arg1 + @arg2 + @arg3'), (4, 5, 6, '@arg1 * @arg2 - @arg3'), (7, 8, DEFAULT, '2. * @arg2 / @arg1'); SELECT * FROM dbo.Computations;

<portType name="CommonIssuesPortType"> <operation name="getIssuesList"> <input message="tns:getIssuesListRequest"/> <output message="tns:getIssuesListResponse"/> </operation> </portType>

This generates the following output:

keycol ------1 2 3 arg1 ----1 4 7 arg2 ----2 5 8 arg3 ----3 6 NULL computation ---------------------@arg1 + @arg2 + @arg3 @arg1 * @arg2 - @arg3 2. * @arg2 / @arg1 result ------6 14 2

Next, issue an UPDATE statement that changes the arg1 values in all rows, and then query the table again:

<binding A binding of our new name="CommonIssuesBinding" port type to SOAP/HTTP type="tns:CommonIssuesPortType"> <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http/"/> <operation name="getIssuesList"> <soap:operation soapAction="urn:getIssuesList"/> <input> <soap:body use="encoded" namespace='urn:CommonIssues' encodingStyle= "http://xml.apache.org/xml-soap/literalxml http://schemas.xmlsoap.org/soap/encoding/"/> </input> <output> <soap:body use="encoded" namespace='urn:CommonIssues' encodingStyle= "http://xml.apache.org/xml-soap/literalxml http://schemas.xmlsoap.org/soap/encoding/"/> </output> </operation> </binding> <service name="CommonIssues"> <documentation> This service provides manufacturer support information on our products. </documentation> <port name="CommonIssuesPort" binding="tns:CommonIssuesBinding"> <soap:address location="http://localhost:80/issues/issues"/> </port> </service> Web service definition </definitions>

UPDATE dbo.Computations SET arg1 *= 2; SELECT * FROM dbo.Computations;

In the Add a Contact dialog box, select the Create a new contact by entering their e-mail address or sign-in name option, and then click Next. In the Please type your contact s complete e-mail address box, type the e-mail address of the contact you wish to add or type someone@microsoft.com, and then click Next. On the last page of the wizard, click Finish.

This generates the following output:

keycol ------1 2 3 arg1 ----2 8 14 arg2 ----2 5 8 arg3 ----3 6 NULL computation ---------------------@arg1 + @arg2 + @arg3 @arg1 * @arg2 - @arg3 2. * @arg2 / @arg1 result ------7 34 1

The definition of the web service port type. This binds the messages together into an RPC request/response operation. The actual web service definition, built from the message, port, and binding information in this file. This is where the actual URL for the service is specified.

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