ASP.NET PDF Viewer using C#, VB/NET

A weakly typed collection class is a manifestation of a collection in Java in the form of the Oracle extension class oracle.sql.ARRAY (which also implements the standard interface java.sql.Array). You can retrieve a database collection of built-in types (such as a nested table of varchar2 elements) as an oracle.sql.ARRAY object in Java. You can also use the oracle.sql.ARRAY interface to retrieve a collection of object types (e.g., a varray of person objects, where person is an object type you created). In such cases, the collection is retrieved as an oracle.sql.ARRAY of oracle.sql.STRUCT objects (we covered the oracle.sql.STRUCT class in 9). A weakly typed collection is mainly useful when, in Java, you don t need to carry out a lot of manipulation of the array object and its elements as objects in memory. In the next two sections, we ll look at the standard Array interface and its Oracle implementation: the ARRAY class.

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Ordinary HTML markup in web forms such as <strong>, <ul>, and <h2> is treated as text and is passed to the browser verbatim (via the LiteralControl server control class). On the other hand, explicit server controls (those with the runat="server" attribute) are processed on the server and translated to HTML markup (just to illustrate, there are server controls that equate to hundreds of HTML tags, and many can be mapped nearly one to one). All server controls can be programmatically managed, which typically means you customize the way they respond to various events or how they appear or behave visually. Categorically speaking, there are two main types of server controls: HTML server controls that directly correspond to an HTML element and web server controls. The second type can be divided into several groups depending on the use of the control. There are, for example, validation controls that ensure that entered values fulfill some criteria, data source controls similar to the ObjectDataSource mentioned earlier, membership controls for handling user login and registration, and many others. In Listing 14-2 you saw server controls such as labels and buttons, both of which are web server controls. It is beyond the scope of this book to discuss the great number of web server controls available in ASP.NET 2.0 and above. As a reference, Table 14-5 shows some of the ones most commonly used.

Now that we ve established the role of CLR Integration, its time to look at the specific types of managed database items this new feature supports. CLR Integration provides five different types of managed database items: Managed stored procedures: The classic stored procedure in a managed language. User-defined functions (UDFs): Return single scalar values and are generally called from queries. Table-valued functions (TVFs): Like user-defined functions, but can return a result set. User-defined aggregates (UDAs): Enable you to define your own custom aggregate function that behaves like SUM, AVG, MAX and other built-in functions. User-defined types (UDTs): Enable you to extend the SQL Server type system with your own custom type.

The java.sql.Array (referred to as Array from here onward) interface provides methods to retrieve the database collection either as a generic Object or as a ResultSet from which you can retrieve the individual elements. An important fact to remember about the Array interface is that it has no setter methods, meaning it can t be used to modify the collection. Some of the more commonly used methods of this interface are presented in the sections that follow with brief descriptions.

Button, TextBox, Label, Panel, CheckBox, ListBox, RadioButton, PlaceHolder, DropDownList Repeater, DataList, GridView, DetailsView ObjectDataSource, SqlDataSource Login, LoginView RequiredFieldValidator, CompareValidator, RegularExpressionValidator

getArray()

In the rest of this section, we discuss each of these options in more detail and provide guidance on how to choose the best option for a particular task.

HTML server controls correspond to a given HTML tag and are simply applied by adding the runat="server" attribute. This turns the standard HTML tag into a server control, allowing you to change its appearance or behavior programmatically. Since web server controls offer a more robust object model, they are almost always preferable to HTML server controls. Validation controls are a special type of web controls that perform typical validation patterns on your web form input fields and display error messages where appropriate. The Validation section of your Visual Studio Toolbox contains the available validation controls, as summarized in Table 14-6.