Simple .NET/ASP.NET PDF document editor web control SDK

connection is just a physical path between a client process and an Oracle instance (e.g., a network connection between you and the instance). A session, on the other hand, is a logical entity in the database, where a client process can execute SQL and so on. Many independent sessions can be associated with a single connection, and these sessions can even exist independently of a connection. We will discuss this further shortly.

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which is discussed in more detail in 15. The first function for querying the database is called GetCategories and simply returns the IDs and names of all the categories in the database; the second one is called GetProducts and it returns information about products in a specified category passed as a parameter. Note that when referring to a concrete variable in the F# Linq query, you must use the paragraph symbol ( ) to splice it as such into the query representation. Now, let s look at the Category.aspx file, shown in Listing 14-8, which contains the ASP.NET markup for viewing products in a specified category. You can specify the category that will be displayed as an argument in the URL, for example, Category.aspx id=3. Listing 14-8. Category.aspx: The ASP.NET Page for Displaying Products in a Category <%@ Page Language="F#" %> <html> <head runat="server"> <title>Category Listing</title> </head> <body> <form runat="server">  <ul> <asp:Repeater runat="server" id="rptProducts" DataSourceID="nwindProducts"> <ItemTemplate> <li><%# this.Eval("ProductName") %> (price: <%# this.Eval("Price") %>)</li> </ItemTemplate> </asp:Repeater> </ul>  <asp:ObjectDataSource id="nwindProducts" runat="server" TypeName="FSharpWeb.DataSource" SelectMethod="GetProducts"> <SelectParameters> <asp:QueryStringParameter Name="categoryId" Type="Int32" QueryStringField="id" DefaultValue="0"/> </SelectParameters> </asp:ObjectDataSource> </form> </body> </html> The ASP.NET markup in Listing 14-8 is not using any code-behind code, because all we need for accessing the data is already available in the module we wrote in Listing 14-7. The first part of the markup declares the ASP.NET Repeater control including an ItemTemplate that will be used for rendering a single product. Similarly to the earlier examples, we use the Eval construct for accessing the data, but in this example the product is represented using the ProductInfo record declared earlier, so we can use the appropriate labels as an argument to the Eval function.

Both dedicated and shared server processes have the same job: they process all of the SQL you give to them. When you submit a SELECT * FROM EMP query to the database, an Oracle dedicated/shared server process parses the query and places it into the shared pool (or finds it in the shared pool already, hopefully). This process comes up with the query plan, if necessary, and executes the query plan, perhaps finding the necessary data in the buffer cache or reading the data from disk into the buffer cache. These server processes are the workhorse processes. Often, you will find these processes to be the highest consumers of CPU time on your system, as they are the ones that do your sorting, your summing, your joining pretty much everything.

In dedicated server mode, there will be a one-to-one mapping between a client connection and a server process (or thread, as the case may be). If you have 100 dedicated server connections on a UNIX machine, there will be 100 processes executing on their behalf. Graphically, it looks as shown in Figure 5-1.

The second part of the markup is far more interesting; it declares an ASPNET ObjectDataSource control, which is a nonvisual control, meaning it will not generate any HTML code It serves simply as a source of data for the Repeater control in the first part, and as you can see, these two are linked together using the DataSourceID attribute of the Repeater control, which is set to the ID of the data source control The ObjectDataSource is configured using the TypeName attribute, which specifies the NET type that implements the functionality (in our case we re using an F# module instead of an object type) The attribute SelectMethod sets a name of the method (or a function in our case) that should be called when the data is required.

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Simple .NET/ASP.NET PDF document editor web control SDK