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The third option is simplest and works fine here (In fact, it is always a valid option Stages with three or more outputs can be built by cascading those for only two Of course, you wouldn't want to do this if most stages had large and/or variable numbers of successors) This leads to base classes that support either one or two links and have one or two corresponding attachment methods, named using a similar ugly suffix convention (attach1, attach2) Because connections are dynamically assignable, they are accessed only under synchronization:

With more and more applications shifting to the Internet, e-business is booming. To conduct business on the Internet, Web applications need to access data stored on a server. Thus, data access is most critical to real-world applications. Visual Studio .NET provides Web Forms controls, such as the DataGrid control that you can use to access data from various data sources, such as a SQL server or a Jet database. This chapter introduces you to the Structured Query Language (SQL), which is used to access data stored on a SQL server through Web Forms. You'll also learn how to use ADO Extensions to create and manage different schema objects, such as databases and tables.

class SingleOutputPushStage { private PushStage next1 = null; protected synchronized PushStage next1() { return next1; } public synchronized void attach1(PushStage s) { next1 = s; } }

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class DualOutputPushStage extends SingleOutputPushStage { private PushStage next2 = null; protected synchronized PushStage next2() { return next2; } public synchronized void attach2(PushStage s) { next2 = s; } }

Server-side data access is critical to all real-world applications. Therefore, these applications must address server-side data access to implement business solutions. This section introduces you to the SQL server data access through Web Forms. Microsoft SQL Server is a Relational Database Management System (RDBMS) that is used to store and organize related data the collection of related data is called a database. Microsoft SQL Server is based on the client/server architecture, in which data is stored on a centralized computer called a server. Other computers, called clients, can access the data stored on the server through a network. The client/server architecture prevents data inconsistency.

4226 Linear stages Now we can build all sorts of classes that extend either of the base classes, simultaneously implementing any of the standard interfaces The simplest transformational stages are linear, singleinput/single-output stages Painters, Wrappers, and Flippers are merely:

class Painter extends SingleOutputPushStage implements PushStage { protected final Color color; // the color to paint boxes public Painter(Color c) { color = c; } public void putA(Box p) { psetColor(color); next1()putA(p); } }

You can access data stored on a SQL server through Web Forms To do so, you can create Web applications that have data access controls These data access Web controls present the data in a consistent manner irrespective of the actual source, such as Microsoft SQL Server or MS Access Therefore, while creating a Web application, you do not need to worry about the format of the data However, before you can access or manipulate data from a SQL server, you need to perform the following steps in the specified sequence: 1 Establish a connection with the SQL Server 2 Write the actual command to access or manipulate data 3 Create a result set of the data from the data source with which the application can work This result set is called the data set and is disconnected from the actual source.

implements PushStage { protected final int thickness; public Wrapper(int t) { thickness = t; } public void putA(Box p) { Dimension d = new Dimension(thickness, thickness); next1()putA(new WrappedBox(p, d)); } }

class Flipper extends SingleOutputPushStage implements PushStage { public void putA(Box p) { if (p instanceof JoinedPair) ((JoinedPair) p)flip(); next1()putA(p); } } Painter and Wrapper stages apply to any kind of Box But Flippers only make sense for JoinedPairs: if a Flipper receives something other than a JoinedPair, it just passes it

The application accesses and updates data in the data set, which is later reconciled with the actual data source To achieve this functionality, you first need to import two namespaces, SystemData and SystemDataSqlClient, into your Web Forms page The syntax is given as follows: <%@ Import Namespace="SystemData" %> <%@ Import Namespace="SystemDataSqlClient" %> The two namespaces are described as follows: SystemData: A collection of classes that are based on the ADONET architecture The ADONET architecture allows for efficient data management and manipulation from multiple data sources ADONET provides tools to request and update data in a data set, and reconcile data in the actual data source Some of the classes included in this namespace are described as follows: o DataSet: Represents the data set cached in memory with which applications work.

4227 Combiners We have two kinds of Combiners, horizontal and vertical Joiners Like the representation classes, these classes have enough in common to factor out a superclass Joiner stages block further inputs until they can combine one item each from putA and putB This can be implemented via guard mechanics that hold up acceptance of additional items from putA until existing ones have been paired up with those from putB, and vice versa:

abstract class Joiner extends SingleOutputPushStage implements DualInputPushStage {

arises. For now we must simply be aware of the relative costs involved in accessing index or table rows from pages that may or may not be stored in the buffer pools.

protected Box a = null; protected Box b = null;

o DataTable: Represents a table of data in a data set o DataRow: Represents a row of data in a data table o DataColumn: Represents a column of data in a data table SystemDataSqlClient: A collection of classes that are used to access SQL server data sources Some of the classes are listed as follows: o SqlConnection: Represents a connection with a SQL server data source The first step to access data from a SQL server database is to create an object of this class o SqlDataAdapter: Represents a set of data commands and a database connection that are used to access or manipulate data After creating a SqlConnection object, you need to create an object of the SqlDataAdapter class to populate the data set and update the data source o SqlCommand: Represents the SQL command to perform data operations in a SQL server data source.

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