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This can be quite useful; for instance, a page can respond directly to a change in a drop-down list without the end user having to click a submit button, thus saving valuable clicks and time in the appropriate situations..

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This last code example is actually a little more complicated than it needs to be. If you don t explicitly provide a connection object in the SqlCommand constructor, it will use the context connection by default. Therefore, you could rewrite this managed stored procedure as: [SqlProcedure()] public static void GetContactFullName() { // Look Ma - no connection! using (SqlCommand cmd = new SqlCommand ("Select Title, FirstName, LastName From Person.Contact")) { SqlContext.Pipe.ExecuteAndSend(cmd); } } Either way, once this stored procedure is deployed to a SQL Server 2005, you can call it like any other stored procedure. For example, you can call it using a T-SQL query: exec GetContactSalutations Or using ADO.NET in a managed language: using (SqlConnection cnn = new SqlConnection(expressConnect)) { cnn.Open(); SqlCommand cmd = new SqlCommand("GetContactSalutations", cnn); cmd.CommandType = CommandType.StoredProcedure; SqlDataReader reader = cmd.ExecuteReader(); // Loop through the reader ... }

As discussed earlier, the ARRAY class implements the standard Array interface, using which you can retrieve the entire collection, a subset of the collection, the collection name, or the base SQL type name of the collection (you ll learn more about each of these soon). However, when using the ARRAY class, you can t modify the collection in the JDBC layer, as it does not provide any setter methods. Creating and passing an ARRAY to a PL/SQL procedure involves three steps: 1. Create an ArrayDescriptor. An ArrayDescriptor is an object of type oracle.sql.ArrayDescriptor that describes the ARRAY object. As mentioned earlier, only one array descriptor is necessary for a particular collection type. For example, you can create an array descriptor object for the varray element varray_of_varchars and reuse it as many times as you want to create different ARRAY objects of the same collection type (assuming that the definition of the underlying collection has not changed). 2. Create an ARRAY object. The next step is to create the ARRAY object that we want to pass to our procedure using the constructor whose signature follows: public oracle.sql.ARRAY(oracle.sql.ArrayDescriptor descriptor, java.sql.Connection connection, java.lang.Object arrayElements ); 3. Pass the ARRAY object to the procedure. The final step is to pass the ARRAY object to the CallableStatement object using the setArray() method of the CallableStatement interface.

The ASP.NET page life cycle consists of a few dozen steps and as such is beyond the scope of this book to discuss in detail. However, it is important to understand the main steps involved in this life cycle. For a complete reference, you can refer to books devoted to ASP.NET. Here we give a brief and simplified description, sufficient enough for most situations. Given a request for a page and assuming that the appropriate page class exists in a compiled form on the server (if not, the ASP.NET runtime kicks in and performs a number of code compilation steps), a page instance is created with all server controls declared but not yet initialized. At this point there are three main life cycle phases (initialization, loading, and rendering). Initialization starts with determining whether the page requested is in postback mode (in which case the view state is encoded in the page request) or for the first time. At this point, the PreInit handler is executed, and the page theme and master page are applied. Next, the Init handler is called, initializing all server controls and the page itself, and then the InitCompleted event is triggered.