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

Next you need to define an interface that you ll bind your queued messages to. An interface is necessary because you re using a COM-based technology, and all COM objects implement at least one interface. Queuing is, therefore, exposed on an interface-specific level of scope. So your Serviced Component must explicitly implement an interface, which your client will use to bind to and leverage the queued behavior. You ll define an interface containing a single method. Remember that methods on this interface will not be able to return values; therefore, any method used with queuing must be declared as returning void. public interface IQueuable { void executeSQL(string sql); } Now you ll create a Serviced Component that implements this interface: [InterfaceQueuing(Interface = "IQueuable")] public class QCDemo : ServicedComponent, IQueuable { public QCDemo() {} public void executeSQL(string sql) { try { SqlCommand cm = new SqlCommand(sql, new SqlConnection(ConnStr)); cm.Connection.Open(); cm.ExecuteNonQuery(); } finally { cm.Connection.Close(); } } } Notice you have decorated the type with the InterfaceQueuing attribute. With this attribute you re declaring your intent to use the named interface with in a queued manner. This will affect how the component gets configured (see Figure 7-9).

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The oracle.sql.ARRAY class extends the Array interface to provide many additional useful methods. Some of the commonly used methods are described here. The createDescriptor() and getDescriptor() methods are used to create and retrieve an oracle.sql.ArrayDescriptor object of the ARRAY object. public static ArrayDescriptor createDescriptor(java.lang.String sqlType, Connection connection) throws SQLException; public ArrayDescriptor getDescriptor() throws SQLException; An ArrayDescriptor object describes the SQL type of an array. Only one array descriptor is necessary for any one SQL type. The driver caches ArrayDescriptor objects to avoid re-creating them if the SQL type has already been encountered. We will look at some examples of this class shortly. The getOracleArray() method is identical to getArray(), but it retrieves the elements in oracle.sql.* format: public synchronized oracle.sql.Datum[] getOracleArray():

Debugging ASP.NET applications is easy when using a tool such as Visual Studio. You can set breakpoints in your F# code, and these will allow you to break into the middle of code executing when server requests are performed. We discuss debugging techniques for regular F# code in 18. During development, it is often necessary to trace what happens on a page, as well as during the process of serving that page. You can enable page tracing by adding the Trace="true" page attribute to your web form. This will append information shown in Table 14-8 to the page displayed. Figure 14-3 shows an example of this information for the application from Listing 14-4.

The getBaseType() method returns the SQL type code for the array elements as defined in the oracle.jdbc.OracleTypes class: public synchronized int getBaseType(); The getSQLTypeName() method returns the fully qualified SQL type name of the array as a whole: public synchronized String getSQLTypeName();

Figure 7-9. An interface configured for queuing Your class is then declared as inheriting from ServicedComponent and implementing IQueuing. Clients will now have the choice of invoking this type via queuing or not. Here s a simple application to test your component: static void Main(string[] args) { string sql = "insert into jobs ( job_desc, min_lvl, max_lvl) " + "values ('Some job',10,250)"; QCDemo o = new QCDemo(); o.Dispose(); Console.Write("Component registered. Press enter to invoke"); Console.ReadLine(); IQueuable qable; try { qable = (IQueuable)Marshal.BindToMoniker ("queue:/new:Server.QCDemo"); for(int i = 0; i < 100; i++) qable.executeSQL(sql); } finally { Marshal.ReleaseComObject(qable); } }

Request Details Trace Information Control Tree Session State Application State Request/Response Cookies Collection Headers Collection Response Headers Collection Server Variables

Strongly typed collection classes are custom classes (typically generated using JPublisher) that represent the elements of a collection using a specific class based on the type of elements in the corresponding database collection. Since these objects store the attributes in a more convenient form (retrievable and modifiable through individual getter and setter methods), they are more suitable in cases where you need to manipulate the array elements in memory. Now that you understand what weakly and strongly typed collection classes are, let s take a look at how to use them in JDBC programs. In the next section, we will look at how to materialize collections consisting of built-in type elements (such as number) as weakly typed ARRAY elements.

In this section, we will demonstrate different ways in which you can materialize collections made of built-in types as weakly typed objects. Specifically, in our examples, we will look at two different collections: A varray of varchar2 elements A varray of number elements Note that the same programs should also work on a nested table composed of built-in types. We first need to create our schema elements, which our example programs will then access and manipulate.