12: Working with Events in Visual Studio .NET

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12: Working with Events
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C12SQLObjectssql Eventstxt Attendeestxt EventAttendeestxt C12FrontEndmdb In this chapter, you will look at an application that allows the user to plan events, work with attendees, and manage attendees of events The structure of the code on the front end and the back end takes a different approach than the last two solutions presented in the previous Access front-end chapters In those chapters, you returned messages and records from stored procedures through Select statements into Recordset objects In this chapter, you will take a different approach The stored procedures will use output parameters to return information Those output parameters will be received by the front-end Access application through ADO Command objects
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When the user first enters this application, they are asked for their SQL Server user name and password After supplying that information, they are taken to the Menu form displayed in Figure 12-1
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Figure 12-1: Menu form Through this form, the user can enter any of the forms or reports in this application If they click the Attendees button, they will see the Attendees form displayed in Figure 12-2
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Figure 12-2: Attendees form
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On this form, the user can add, edit, delete, and view any of the attendees Notice the combo box on the form This object provides the user with navigation abilities They find the attendee whose information they wish to view and select it When the user does that, the Attendees information appears on the form When the user wants to add an attendee, they can click the Clear button to clear the contents of the form and then click the Add button after filling in the form When the user clicks the Events button on the menu form, they see the Events form displayed in Figure 12-3
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Figure 12-3: Events form The Events form is made up of a form and a subform The main part of the form displays the event information The user can add, edit, delete, and view events through this form They navigate to different events through the combo box The subform is really a list box that lists all of the attendees for the event The user can add an Attendee by clicking the Add Attendee button When they do that, they see the dialog box form displayed in Figure 12-4
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Figure 12-4: Add Attendee form The user will select the attendee that they wish to add to this event and click the OK button When they do that, they will see the name of the attendee they selected appear in the Attendees list The other button on the form is the Event Attendance button When this button is clicked, the user sees the report displayed in Figure 12-5
Figure 12-5: Event Attendance report
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The Event Attendance report links to a SQL Server view that returns the total number of people that are listed as attendees for an event
Tables and Relationships
On The CD-ROM C12SQLObjectssql
Events Table
The Events table is one of the top-level tables in this database It stores all the information about an event
Attendees Table
The Attendees table is the other top-level table in the database It stores the names and information about the people listed as attendees to an event
EventAttendees Table
The two top-level tables are in a many-to-many relationship Each of the attendees can attend many events, and each of the events can have many attendees Since they are in such a relationship, you need a connecting table The EventAttendees table satisfies that role It is in a one-to-many relationship with both the Events table and the Attendees table Each event can have many records listed in this table, and each attendee can have many records in this table
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