upc connect box nincs internet Lesson 1: Designing Caching Strategies in .NET

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Lesson 1: Designing Caching Strategies
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System.Web.Caching.Cache.NoSlidingExpiration, _ System.Web.Caching.CacheItemPriority.Normal, _ Nothing)
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In the previous code example, the fourth parameter was set with a value of NoAbsoluteExpiration. This indicates that the item should never expire. The NoSlidingExpiraton value indicates that the item expiration will never be reset. Finally, the CacheItemPriority parameter with a value of Normal indicates that the item will not be removed until all BelowNormal and Low priority items are removed. The Add method uses parameters similar to the Insert method. An example of using this method is as follows:
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//C# //Use the Add method to add an item to the cache Cache.Add("CacheKey", "Cache Value", null, DateTime.Now.AddMinutes(2), System.Web.Caching.Cache.NoSlidingExpiration, System.Web.Caching.CacheItemPriority.High, null); 'VB 'Use the Add method to add an item to the cache Cache.Add("CacheKey", "Cache Value", Nothing, _ DateTime.Now.AddMinutes(2), _ System.Web.Caching.Cache.NoSlidingExpiration, _ System.Web.Caching.CacheItemPriority.High, _ Nothing)
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This code example specified an expiration date of two minutes. In addition, the priority value was set to high, which means that this is the last item that will be deleted from the cache. To remove an item from the cache, you use the Remove method. This might be necessary when the item has no expiration date. Otherwise, an item will remain in the cache after it is no longer needed and will consume unnecessary system resources. A code example using the Remove method is as follows:
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//C# Cache.Remove("CacheKey"); 'VB Cache.Remove("CacheKey")
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In some cases, you might want to store the results of a database query in the cache. Just as with a string value, you can store a DataSet in the cache. For example, the following code will first check to see whether the DataSet has been stored in the cache. If it has not, then it will retrieve the data using a command object. Otherwise, it will just use the DataSet that resides in the cache object named dsProductsCache.
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Designing a Cursor and Caching Strategy
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//C# DataSet dsProductsCache; //Look to see if the Dataset is already in the cache dsProductsCache = (DataSet)Cache["dsProducts"]; if (dsProductsCache == null) { DataSet dsProducts = new DataSet("Products"); SqlDataAdapter adapter = new SqlDataAdapter(); //Initiate the connection to SQL Server String connString = @"server=.\SQL2005STD;" + "Integrated Security=SSPI;" + "Database=AdventureWorks"; SqlConnection conn = new SqlConnection(connString); //Define the query that will be executed String queryString = "select * from production.product"; //Define the query that will be executed SqlCommand cmd = new SqlCommand(queryString, conn);
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//Populate the adapter with results of the query adapter.SelectCommand = cmd; adapter.Fill(dsProducts); dsProductsCache = (DataSet)dsProducts; } try { //Set the datasource for the dataViewGrid control on the form grdProducts.DataSource = dsProductsCache.Tables[0]; grdProducts.DataBind(); } catch (Exception ex) { //Put exception handling here } 'VB Dim dsProductsCache As New DataSet("dsProductsCache") dsProductsCache = Cache("dsProducts") If dsProductsCache Is Nothing Then
Dim dsProducts As New DataSet("Products")
Lesson 1: Designing Caching Strategies
Dim adapter As New SqlDataAdapter() 'Initiate the connection to SQL Server Dim connString As String = "server=.\SQL2005STD;" & _ "Integrated Security=SSPI;" & _ "Database=AdventureWorks" Dim conn As New SqlConnection(connString) 'Define the query that will be executed Dim queryString As String = "select * from production.product" 'Define the query that will be executed Dim cmd As New SqlCommand(queryString, conn) 'Populate the adapter with results of the query adapter.SelectCommand = cmd adapter.Fill(dsProducts) dsProductsCache = dsProducts End If Try 'Set the datasource for the dataViewGrid control on the form grdProducts.DataSource = dsProductsCache.Tables(0) grdProducts.DataBind() Catch ex As Exception 'Put exception handling code here End Try
Using Query Notifications
Query notifications is a new feature available with SQL Server 2005. It is available through the SQL Native Client provider. Query notifications allows applications to be notified when certain data has changed. Therefore, applications only need to refresh DataSets when the data is different and not every time the page is requested. This is particularly useful when establishing a caching strategy because you can control precisely when the cache is refreshed based on an actual need and not just when the cache expires. The notifications are available because SQL Servers Service Broker is continually polling the server looking for updates. When the notification is established, a time-out period is assigned, and the notification stays active until that period has elapsed. You can cancel the notification prior to the time-out period by executing a notification using the same query but with a timeout period of zero. To establish a query notification, you must first create a queue and a service. This can be accomplished with the following Transact-SQL code:
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