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Fields Specifications Events Table
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On The CD-ROM Eventstxt The field specifications for the Events table are displayed in Table 12-1
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Table 12-1: Events Table Field Specifications
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Field Name EventID EventName StartDate EndDate Location TheDescription Field Type int varchar datetime datetime varchar varchar Length = 1000 Length = 2000 Notes Primary Key, Identity Column Length = 50
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The EventID field is the primary key in this table It uniquely identifies each record Since it is an identity column, the value is automatically inserted when a new record is added Through code in the stored procedures, a rule is enforced on the date fields The EndDate field must be greater than the StartDate field
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Attendees Table
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On The CD-ROM Attendeestxt The field specifications for the Attendees table are displayed in Table 12-2
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Table 12-2: Attendees Table Field Specifications
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Field Name AttendeeID FirstName LastName PhoneNumber Field Type int varchar varchar varchar Notes Primary Key, Identity Column Length = 50 Length = 50 Length = 50
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Table 12-2: Attendees Table Field Specifications
Field Name EmailAddress Field Type varchar Notes Length = 50
The AttendeeID field is the primary key in this table The other fields store the information about the attendee
EventAttendees Table
On The CD-ROM EventAttendeestxt The field specifications for the EventAttendees table are displayed in Table 12-3
Table 12-3: EventAttendees Table Field Specifications
Field Name EventAttendeeID EventID AttendeeID Field Type int int int Notes Primary Key, Identity Column Foreign Key Foreign Key
The EventAttendeeID field is the primary key for the table The EventID field is a foreign key that links this table with the Events table The AttendeeID field is another foreign key It links this table to the Attendees table in a one-to-many relationship
User-Defined Functions EventIDCheck Function
In a variety of places, you need to confirm that an EventID exists or does not exist The EventIDCheck function performs such a task CREATE FUNCTION EventIDCheck (@TheID integer) RETURNS Integer AS BEGIN Declare @TheCount Integer Select @TheCount = Count(EventID) from Events Where EventID = @TheID Return @TheCount END The function requires a single parameter, the ID of the event to check for to be passed in: CREATE FUNCTION EventIDCheck (@TheID integer) The function returns the number of times the ID was found through an integer return value: RETURNS Integer AS The procedure needs a local variable to store the return value: Declare @TheCount Integer which is set to the number of times the ID being sought was found: Select @TheCount = Count(EventID) from Events Where EventID = @TheID That value is then returned from the function: Return @TheCount
AttendeeIDCheck Function
The AttendeeID check returns the number of occurrences that an AttendeeID was found A return of 0 would indicate that the ID is not in use, while any other number would indicate that it is in use CREATE FUNCTION AttendeeIDCheck (@TheID integer) RETURNS Integer AS BEGIN
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Declare @TheCount Integer Select @TheCount = Count(AttendeeID) from Attendees Where AttendeeID = @TheID Return @TheCount END The function needs a single parameter, the ID of the attendee that you are checking: CREATE FUNCTION AttendeeIDCheck (@TheID integer) The function will return an integer: RETURNS Integer AS You then declare a variable: Declare @TheCount Integer that is set to the number of times that the AttendeeID was found in the Attendees table: Select @TheCount = Count(AttendeeID) from Attendees Where AttendeeID = @TheID That value is returned from the function: Return @TheCount
EventAttendeeIDCheck Function
The other function in this SQL Server database returns the number of times an EventAttendeeID is found CREATE FUNCTION EventAttendeeIDCheck (@TheID integer) RETURNS Integer AS BEGIN Declare @TheCount Integer Select @TheCount = Count(EventAttendeeID) from EventAttendees Where EventAttendeeID = @TheID Return @TheCount END The function requires a single parameter, which is the ID being sought: CREATE FUNCTION EventAttendeeIDCheck (@TheID integer) and returns an integer: RETURNS Integer AS Within the code block of the procedure, you declare a variable: Declare @TheCount Integer that is set to the number of times that the ID being sought was found: Select @TheCount = Count(EventAttendeeID) from EventAttendees Where EventAttendeeID = @TheID That value is returned from the function: Return @TheCount
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