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Formatting XML data using XSLT is a popular technique since XML has a structured layout that can be easily manipulated. In previous projects such as the typeahead suggest in chapter 10, we used JavaScript, XML, and DOM manipulation to create the HTML that we were to display. In this example, we use XSLT to produce the same effect. XSLT enables us to format our data by building the HTML layout in another file and combining it with the XML document. The XSLT file takes all of the guesswork out of navigating through the XML nodes and building our tables, menus, and HTML layouts. With Ajax, we can retrieve a static or dynamic XML file and a static or dynamic XLST file from the server, and combine them on the client to build our HTML document. XSLT could also be undertaken on the server side, but we ll look at client-side transformations here.

This is actually a shortcut to setting the CleanCompilationOutputOnly and SkipInitializeWorkspace properties to true and the ForceGet property to false, but it is recommended that you use the IncrementalGet property over setting these properties individually.

review TEXT NOT NULL, rating SMALLINT NOT NULL, created_on TIMESTAMP NOT NULL, CONSTRAINT pk_review_id PRIMARY KEY (review_id), CONSTRAINT fk_customer_id FOREIGN KEY (customer_id) REFERENCES customer (customer_id) ON UPDATE RESTRICT ON DELETE RESTRICT, CONSTRAINT fk_product_id FOREIGN KEY (product_id) REFERENCES product (product_id) ON UPDATE RESTRICT ON DELETE RESTRICT ); 4. Execute the following code, which creates the review_info type and the catalog_get_product_review function in your hatshop database: -- Create review_info type CREATE TYPE review_info AS ( customer_name VARCHAR(50), review TEXT, rating SMALLINT, created_on TIMESTAMP ); -- Create catalog_get_product_reviews function CREATE FUNCTION catalog_get_product_reviews(INTEGER) RETURNS SETOF review_info LANGUAGE plpgsql AS $$ DECLARE inProductId ALIAS FOR $1; outReviewInfoRow review_info; BEGIN FOR outReviewInfoRow IN SELECT c.name, r.review, r.rating, r.created_on FROM review r INNER JOIN customer c ON c.customer_id = r.customer_id WHERE r.product_id = inProductId ORDER BY r.created_on DESC LOOP RETURN NEXT outReviewInfoRow; END LOOP; END; $$; The catalog_get_product_review function retrieves the reviews for the product identified by the inProductId parameter. You also need the name of the reviewer so we made an INNER JOIN with the customer table.

variable or parameter variable to null is the same as not referencing the variable at all . In other words, the JIT compiler optimizes the t = null; line out of the code completely, and therefore, the program still does not work as we desire . The correct way to modify the Main method is as follows:

Now that you understand how the Set type is designed and how it works, let s see how to use delegates to call back static methods The StaticCallbacks method that appears in the previous code sample is the focus of this section The StaticCallbacks method begins by constructing a Set object, telling it to create an array of five objects Then ProcessItems is called, passing it null for its feedback parameter ProcessItems represents a method that performs some action for every item managed by the Set Because the feedback parameter is null in this example, each item is processed without calling any callback methods For the second call to ProcessItems, a new SetFeedback delegate object is constructed This delegate object is a wrapper around a method, allowing that method to be called back indirectly via the wrapper.

each record. Is the record inserted Has the record been modified Has the record been deleted Unlike ADO, where navigating within the recordset commits changes to the record you navigate away from, the ADO.NET DataSet object is designed to allow you to make all the changes you want to (all the time, with no connection to the data source) and then commit them when you re finished. The new model of disconnected data access works very well in the ASP.NET world. Forget about all you could do with an ADO recordset for a while, and take a look at the ADO.NET way of getting data. It s a little different, but it can greatly enhance the performance and scalability of your application. Using ADO.NET from ASP.NET Many of the most exciting advances in using data inside ASP.NET involve the additional server-side controls that can be used in Web Forms. I ll introduce these controls in 9. For now, I ll show you how to connect to a data source, how to select data, how to insert data, and how to update data using both SQL statements and stored procedures.

In this case, i.seller and b.bidder are both foreign keys of the USER table. Note that this is an important query in our application; we use it to identify people bidding for their own items. We might also like to compare a foreign key value to a query parameter for example, to find all Comments from a User: