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The queries you ve looked at so far have always been single queries that performed only one action; for example, you ve performed SELECT queries that return one set of results and INSERT queries that insert data into a single table. When you step into more complex data (and need more complex results), you ll find this way of working constrictive. Stored procedures can contain just single SQL queries, and when they do so, they re naturally direct replacements for single queries. However, stored procedures are a powerful tool that can deliver much more than this. As you ll learn in this chapter, stored procedures can

This example shows a single possible advertisement. To add more advertisements, you would create multiple <Ad> elements and place them all inside the root <Advertisements> element: <Advertisements> <Ad> <!-- First ad here. --> </Ad>

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Another default that Sortable sets is for the list to be vertical This means the dragging direction for items is up and down Since our list is horizontal, we need to change this setting by specifying the constraint parameter We could set this value to horizontal, but since the list of images for a single post may span multiple rows (such as on a low-resolution monitor) it would not be possible to drag images on the second row to the first (and vice versa) To deal with this, we simply set constraint to be false Since our list is horizontal, we must change the overlap value to be horizontal instead of its default of vertical Sortable uses this value to determine how to calculate when an item has been dragged to a new location.

increase the performance of your queries and make maintaining Web sites a whole lot easier. They may contain multiple queries and exploit the power of SQL itself. In a nutshell, using stored procedures gives you the following benefits: Maintenance: Hard-coded queries on individual pages mean a string of SQL on each and every one of those pages. If you use the same query on several pages and need to change the query, you have to make the changes in every page. Stored procedures make maintaining the site easier by having only one copy of the query. Security: Allowing direct access to the tables within the database to applications, as you ve already seen in 2, forces you to grant too much access to the database. By using stored procedures, you allow the user access to the tables only through stored procedures, and you can apply suitable controls. Speed: Depending on the database server that you re using, you may also gain a speed advantage from using stored procedures. If you re using MySQL 5.0 and pass a query to the server, the query must be parsed and an execution plan calculated for the query. If you pass the same query three times, MySQL 5.0 calculates the execution plan three times. MySQL 5.0 stored procedures are cached when they re created, and thereafter the precached versions are used. With SQL Server 2005, stored procedures do not process much more quickly than queries, because it also caches and reuses the execution plans of queries passed directly. Reduced network traffic: Stored procedures allow you to process the results at the database and return only the required results to the page.

<Ad> <!-- Second ad here. --> </Ad> </Advertisements> Each <Ad> element has a number of other important properties that configure the link, the image, and the frequency, as described in Table 11-4. Table 11-4. Advertisement File Elements

Listing 11-46 shows the code we must add to the constructor of the BlogImageManager JavaScript class in /htdocs/js/BlogImageManagerclassjs Note that this code uses the onSortUpdate() function, which we have not yet defined..

The image that will be displayed. This can be a relative link (a file in the current directory) or a fully qualified Internet URL. The link that will be followed if the user clicks the banner. The text that will be displayed instead of the picture if it cannot be displayed. This text will also be used as a tooltip in some newer browsers. A number that sets how often an advertisement will appear. This number is relative to the numbers specified for other ads. For example, a banner with the value 10 will be shown twice as often (on average) as the banner with the value 5. A keyword that identifies a group of advertisements. You can use this for filtering. For example, you could create ten advertisements and give half of them the keyword Retail and the other half the keyword Computer. The web page can then choose to filter the possible advertisements to include only one of these groups.

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