C# ПІДРУЧНИКИ / c# / Premier Press - C# Professional Projects
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DESIGNING THE APPLICATION |
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Creating the dtCancellations Table
All cancellations made in the dtReservations table are recorded in the dtCancellations table.The query for creating the dtCancellations table is given as follows:
CREATE TABLE [dbo].[dtCancellations] (
[TicketNo] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [Refund] [int] NOT NULL ,
[ProcessedBy] [char] (15) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [CancellationDate] [datetime] NOT NULL
) ON [PRIMARY] GO
Creating the dtDepartedFlights Table
The dtDepartedFlights table is similar to the dtReservations table. After flight departure, data pertaining to the flight is moved from the dtReservations table to the dtDepartedFlights table. The script that generates the dtDepartedFlights table is given as follows:
CREATE TABLE [dbo].[dtDepartedFlights] (
[TicketNo] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [FltNo] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [DateOfJourney] [datetime] NOT NULL ,
[ClassOfRes] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [Name] [char] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [EMail] [char] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Fare] [int] NOT NULL , [Status] [int] NOT NULL ,
[ReservedBy] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [DateOfRes] [datetime] NOT NULL ,
[TicketConfirmed] [bit] NULL ) ON [PRIMARY]
GO
460 Project 4 CREATING AN AIRLINE RESERVATION PORTAL
Creating the dtPassengerDetails Table
The dtPassengerDetails table is used for storing data pertaining to passengers who have a valid e-mail address.The table is used to make discounts available for the frequent fliers program. To create the dtPassengerDetails table, execute the following script:
CREATE TABLE [dbo].[dtPassengerDetails] (
[EMail] [char] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [FareCollected] [int] NOT NULL ,
[TotalTimesFlown] [int] NOT NULL ) ON [PRIMARY]
GO
Creating the dtFrequentFliers Table
The dtFrequentFliers table is used to store a list of passengers eligible for the frequent fliers program. The list is retrieved from the dtPassengerDetails table on the basis of a query specified by business managers. To create the dtFrequentFliers table, run the following script:
CREATE TABLE [dbo].[dtFrequentFliers] (
[EMail] [char] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [Discount] [int] NOT NULL
) ON [PRIMARY] GO
Now that you have created all the tables, the next step is to set primary keys and specify relationships between tables. You do that in the next section.
Managing Primary Keys and Relationships
Primary keys are used to ensure that the records in a table are unique. The primary keys for all database tables are listed in Table 20-1.
DESIGNING THE APPLICATION |
Chapter 20 |
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Table 20-1 Primary Key Fields in Tables
Table Name |
Primary Key Field |
dtUsers |
Username |
dtFltDetails |
FltNo |
dtReservations |
TicketNo |
dtCancellations |
TicketNo |
dtDepartedFlights |
TicketNo |
dtPassengerDetails |
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dtFrequentFliers |
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To specify primary keys for tables, run the following script:
ALTER TABLE [dbo].[dtCancellations] WITH NOCHECK ADD
CONSTRAINT [PK_dtCancellation] PRIMARY KEY CLUSTERED
(
[TicketNo] ) ON [PRIMARY]
GO
ALTER TABLE [dbo].[dtDepartedFlights] WITH NOCHECK ADD
CONSTRAINT [PK_dtDepartedFlights] PRIMARY KEY CLUSTERED
(
[TicketNo] ) ON [PRIMARY]
GO
ALTER TABLE [dbo].[dtFltDetails] WITH NOCHECK ADD
CONSTRAINT [PK_dtFltDetails] PRIMARY KEY CLUSTERED
(
[FltNo]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[dtFrequentFliers] WITH NOCHECK ADD
CONSTRAINT [PK_dtFrequentFlier] PRIMARY KEY CLUSTERED
(
[EMail]
) ON [PRIMARY]
GO
462 Project 4 CREATING AN AIRLINE RESERVATION PORTAL
ALTER TABLE [dbo].[dtPassengerDetails] WITH NOCHECK ADD
CONSTRAINT [PK_dtAllCustomers] PRIMARY KEY CLUSTERED
(
[EMail]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[dtReservations] WITH NOCHECK ADD
CONSTRAINT [PK_dtReservations] PRIMARY KEY CLUSTERED
(
[TicketNo] ) ON [PRIMARY]
GO
ALTER TABLE [dbo].[dtUsers] WITH NOCHECK ADD
CONSTRAINT [PK_dtUsers] PRIMARY KEY CLUSTERED
(
[Username] ) ON [PRIMARY]
GO
After creating the tables and setting the primary keys, you need to create relationships between tables. Relationships between tables are discussed in Table 18-8 of Chapter 18. To create relationships between tables, run the following code:
ALTER TABLE [dbo].[dtCancellations] ADD
CONSTRAINT [FK_dtCancellation_dtUsers] FOREIGN KEY
(
[ProcessedBy]
) REFERENCES [dbo].[dtUsers] ( [Username]
)
GO
ALTER TABLE [dbo].[dtDepartedFlights] ADD
CONSTRAINT [FK_dtDepartedFlights_dtPassengerDetails] FOREIGN KEY
(
[EMail]
) REFERENCES [dbo].[dtPassengerDetails] ( [EMail]
) NOT FOR REPLICATION
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GO
ALTER TABLE [dbo].[dtDepartedFlights] nocheck constraint [FK_dtDepartedFlights_dtPassengerDetails]
GO
ALTER TABLE [dbo].[dtFltStatus] ADD
CONSTRAINT [FK_dtFlightStatus_dtFltDetails] FOREIGN KEY
(
[FltNo]
) REFERENCES [dbo].[dtFltDetails] ( [FltNo]
)
GO
ALTER TABLE [dbo].[dtFrequentFliers] ADD
CONSTRAINT [FK_dtFrequentFlier_dtAllCustomers] FOREIGN KEY
(
[EMail]
) REFERENCES [dbo].[dtPassengerDetails] ( [EMail]
)
GO
ALTER TABLE [dbo].[dtReservations] ADD
CONSTRAINT [FK_dtReservations_dtFltDetails] FOREIGN KEY
(
[FltNo]
) REFERENCES [dbo].[dtFltDetails] ( [FltNo]
),
CONSTRAINT [FK_dtReservations_dtUsers] FOREIGN KEY
(
[ReservedBy]
) REFERENCES [dbo].[dtUsers] ( [Username]
)
GO
466 Project 4 CREATING AN AIRLINE RESERVATION PORTAL
Default.aspx
The default.aspx form is the first form displayed when a user visits a Web site. The default.aspx form is the logon form for the Web application. When users visit the Web application, they need to log on by specifying their logon credentials in the default.aspx form. Subsequently, depending upon the position of the user, the user is redirected to other forms of the Web application.
You can change the form WebForm1.aspx, added to the Web application by default, to make the form the default.aspx page. To do so, follow these steps:
1.Right-click on WebForm1.aspx in Solution Explorer and select Rename.
2.Type the name of the form as default.aspx.
3.Double-click on default.aspx to open the code-behind file in the Code Editor window.
4.Change the name of the class to WebLogonForm.
5.Return to the design view of the default.aspx form.
6.In the design view of the form, in the @ Page directive in the first line, change the name of the class to WebLogonForm. The new @ Page directive is given as follows:
<%@ Page language=”c#” Codebehind=”default.aspx.cs” AutoEventWireup=”false”
Inherits=”SkyShark.WebLogonForm” %>
NOTE
By performing these steps, you have changed the name and the default class associated with the Web form.These steps need to be carried out for all Web forms that you will add to the project. However, I will not repeat these steps separately for each Web form.
To design the default.aspx form, add controls to it and change their properties as shown in Table 20-2.
