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If true, caching is switched on. It s false by default. Uses a value from the DataSourceCacheExpiry enumeration Absolute for absolute expiration (which times out after a fixed interval of time) or Sliding for sliding expiration (which resets the time window every time the data object is retrieved from the cache). The number of seconds to cache the data object. If you are using sliding expiration, the time limit is reset every time the object is retrieved from the cache. The default, DataSourceCacheExpiry.Infinite, keeps cached items perpetually. Allows you to make a cached item dependent on another item in the data cache (CacheKeyDependency) or on a table in your database (SqlCacheDependency). Dependencies are discussed in the Cache Dependencies section.

Figure 11-4. Retrieving data from the cache To fill the grid, you use the following SqlDataSource: <asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees WHERE City=@City"> <SelectParameters> <asp:ControlParameter ControlID="lstCities" Name="City" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource>

Then, when it comes time to use this view, it s easy to customize by providing these details using a URL configuration. Simply supply the argument values as an extra dictionary in the URL configuration, and they ll be passed along each time the view is called from that URL pattern.

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In this example, each time you select a city, a separate query is performed to get just the matching employees in that city. The query is used to fill a DataSet, which is then cached. If you select a different city, the process repeats, and the new DataSet is cached separately. However, if you pick a city that you or another user has already requested, the appropriate DataSet is fetched from the cache (provided it hasn t yet expired).

SqlDataSource caching works only when the DataSourceMode property is set to DataSet (the default). That s because the DataReader object can t be efficiently cached, because it represents a live connection to the database.

Caching separate results for different parameter values works well if some parameter values are used much more frequently than others For example, if the results for London are requested much more often than the results for Redmond, this ensures that the London results stick around in the cache even when the Redmond DataSet has been released Assuming the full set of results is extremely large, this may be the most efficient approach On the other hand, if the parameter values are all used with similar frequency, this approach isn t as suitable One of the problems it imposes is that when the items in the cache expire, you ll need multiple database queries to repopulate the cache (one for each parameter value), which isn t as efficient as getting the combined results with a single query.

If you fall into the second situation, you can change the SqlDataSource so that it retrieves a DataSet with all the employee records and caches that The SqlDataSource can then extract just the records it needs to satisfy each request from the DataSet This way, a single DataSet with all the records is cached, which can satisfy any parameter value To use this technique, you need to rewrite your SqlDataSource to use filtering First, the select query should return all the rows and not use any SELECT parameters: <asp:SqlDataSource ID="sourceEmployees" runat="server" SelectCommand="SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees" ..> </asp:SqlDataSource> Second, you need to define the filter expression This is the portion that goes in the WHERE clause of a typical SQL query, and you write it in the same way as you used the DataViewRowFilter property in 9.

This approach can even be used with models that use other types of IDs, such as a music database using catalog numbers in the format of DJNG-001; anything that can be guaranteed unique among all objects can be used as an object s primary key. Since our new generic view simply passes the ID straight through to the database API, it s easy to support these other types of IDs by simply adjusting the URL pattern appropriately.

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