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CHAPTER 11 DATA ACCESS LAYER SERVICES
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This time the command line tool simply calls the stored procedure that was created when you enabled the database, AspNet_SqlCacheRegisterTableStoredProcedure. It accepts a table name as a parameter and creates a trigger for inserts, updates, and deletes on it. This implementation of this trigger calls another stored procedure: AspNet_SqlCacheUpdateChangeIdStoredProcedure. This procedure, now called whenever an insert, update, or delete occurs in the registered table, updates the table that gets polled. The next time the dependency polls this table, it will see the fact that the registered table has changed. That s it for the SQL Server-specific setup needed for cache dependencies. The rest of the setup gets done within the web application that s going to declare a dependency. First, you must add a configuration entry to the application s configuration file. This is an element named caching, added as a child to the system.web element. <caching> <sqlCacheDependency enabled="true" pollTime="10000"> <databases> <add name="Publishers" connectionStringName="localPubs" /> </databases> </sqlCacheDependency> </caching> The SqlCacheDependency element allows you to enable caching and set the default frequency of the database polling. This is a number of milliseconds, so here you re setting it to poll every ten seconds. If your DBA cringes at the thought of polling the database every ten seconds, remind her that it s a simple request of a very small table, and far better than having to go back to the database for the entire result set with every request. Even when polling, this strategy should result in a net reduction of overall database traffic. This presupposes, of course, that there is sufficient demand for (or expense in creating) the result set to warrant adoption of a caching strategy in the first place. A resource that isn t under high demand should not be cached with a database dependency. Polling might actually increase traffic in that case. The databases element is where you map names of dependencies to connection strings the dependency will use to connect and poll. This dependency is named Publishers to illustrate that it is not actually a database, and does not even name anything you configured with a command line tool. It is arbitrary. You use this name when creating a dependency object, and it is nothing more than a convoluted way of giving the dependency object a connection string to use to poll the database (an alias for an alias for a connection string). The connectionStringName attribute refers to a named connection from the connectionString element (covered in the 10 discussion on connection strings). <connectionStrings> <add name="localPubs" connectionString="Server=.;Database=Pubs;uid=sa;pwd=123123" /> </connectionStrings> Everything is now set up to use the dependency.
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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Let s add SQL cache invalidation to the sorting example we examined in 10. Here we showed you how to read the authors table, cache the dataset, and then create a DataView to represent each sort, and cache each of those. To make the dataset dependent upon the data changing, you have only to modify the line inserting the DataSet into the cache (you can find this code in SortIE.aspx of the Web11 project). private DataSet GetAuthors() { DataSet ds; ds = (DataSet)Cache["AuthorData"]; if (ds == null) { ds = new DataSet(); SqlConnection cn = new SqlConnection ("server=.;database=pubs;uid=sa;pwd=123123"); SqlCommand cm = new SqlCommand("select * from authors", cn); new SqlDataAdapter(cm).Fill(ds); Cache.Insert("AuthorData", ds, new SqlCacheDependency("Publishers", "authors")); } return ds; } The third argument of the call to the Insert method is an instance of a CacheDependency object. Since SqlCacheDependency inherits from CacheDependency, you can create a new instance and configure it with its constructor. The first argument the constructor accepts is the name you gave the dependency entry in the configuration file. This maps back to the connection string the dependency will use for polling. The second parameter is the name of the table you want to watch. This table must be configured using the -et switch of the command line tool. The cache will now start polling the database every ten seconds. As your user selects different sorts, different DataView instances are created and put in the cache as well. You ll make the same change to the line inserting these into the cache. private void BindGrid(string sortExpr) { DataView dv; string sCacheEntry = string.Format("Author_Sort_{0}", sortExpr); dv = (DataView)Cache[sCacheEntry];
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