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

Managed Stored Procedures A good way to introduce CLR Integration is to start by looking at the stored procedure functionality. With this feature, you can write a stored procedure using any .NET language. Once the stored procedure is completed and deployed to the database, you can invoke it like any standard T-SQL stored procedure. The code within a managed stored procedure looks similar to any other code written in C# or VB .NET. The main difference, however, is that the logic must somehow access the internal database data and also must return result sets back to the caller. To facilitate this, SQL Server 2005 provides several interesting features. In-proc ADO.NET: This is a term used to describe the technology used to access SQL Server 2005 data from managed code running inside the database process. This technology provides data access through standard ADO.NET API calls. In other words, it contains classes like SqlCommand and SqlDataReader that you can use to query the database and read the results. SqlPipe: This class enables you to return the results of the stored procedure back to the caller. SqlContext: This class provides access to the current SQL context. Most notably, it contains a Pipe property that returns a SqlPipe object that you can use to return the results of a query to the caller. For example, the following code defines a stored procedure that returns the title, first, and last name of every row in a Contacts table. public partial class StoredProcedures { [SqlProcedure()] public static void GetContactFullName() { // Note the connection string for an in-proc connection using (SqlConnection cnn = new SqlConnection("context connection=true")) using (SqlCommand cmd = new SqlCommand( "Select Title, FirstName, LastName From Person.Contact", cnn)) { cnn.Open(); SqlCommand cmd = new SqlCommand( "Select Title, FirstName, LastName From Person.Contact", cnn);

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The various overloaded versions of getResultSet() method retrieve a result set that contains the elements of the database collection (either all elements or a slice of elements as specified by index and count parameters) pointed to by a given Array object. public ResultSet getResultSet() throws SQLException; public ResultSet getResultSet( Map typeMap ) throws SQLException; public ResultSet getResultSet( long index, int count ) throws SQLException; public ResultSet getResultSet(long index, int count, int typeMap ) throws SQLException; The ResultSet contains two columns. The first column is the index of the element, and the second column is the element itself. The classes into which individual elements are materialized are based on a type map (either supplied in an overloaded version or the default values from Table A-1 of the Appendix). Again, the overloaded methods that take a type map as a parameter (the first and the third methods in the preceding list) use the supplied type map instead of the one associated with the Connection object to deduce the Java classes into which the elements are materialized.

RequiredFieldValidator RangeValidator RegularExpressionValidator CompareValidator CustomValidator ValidationSummary

getBaseTypeName()

Figure 7-8. The process of a method call to queued component Creating queued components is a little more involved than some of the other features of COM+. You ll need to do specific configurations on the server and on the client. You must add an assembly-level attribute to the assembly containing your components to queue. Finally, you must define an interface with all the methods you re planning to queue for a component, and then your Serviced Component must implement the interface. When a client creates an instance of the component, it won t automatically call it using queuing. The good part about this is that the client has the flexibility to call the component in a queued manner or not. The downside is the need to write some specific code to leverage the queuing functionality. (You can find this queuing code in the Client and Server projects in the QCDemo directory of the Code07 solution.) Let s start by taking a look at the assembly-level attribute that must be present. [assembly: ApplicationQueuing(Enabled = true, QueueListenerEnabled = true)] This sets up the application containing the component so that it can be queued. You can control the maximum number of listener threads with the attribute as well. The default is 16 per processor on the hosting machine.

InitialValue MinimumValue, MaximumValue, Type ValidationExpression ControlToCompare, Operator, ValueToCompare, Type ClientValidationFunction, ServerValidate (event) DisplayMode, HeaderText, ValidationGroup

This method returns the SQL type name of the elements of this array. public synchronized String getBaseTypeName();

You may end up working with complex web pages that have many, even dozens, of input controls that belong to different forms on the page (for instance, a web page with a search form, a user registration form, and a contact form). By default, all validators defined on the page would be run and most likely prohibit your end user from moving onto the next page because of validation errors that are seemingly unrelated to the chosen action of the user. To solve this problem, you can turn to using validation groups, which specify a set of related controls and their validators. A validation group is formed by specifying a common group name (as a string) for the ValidationGroup property of each validator and the input control that triggers a page submission. This will ensure that only the validators that are related to the control initiating the page submission will be run. Finally, you can disable any validation by setting the CausesValidation property of a postback control to false.