Doubt regarding duplicates not allowed

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hi all,
i need help.In my project there is one webpage where any employee can book the conference room from that.my doubt is if any one books at a particular time no other employee should book at the same time i.e duplicate booking is not allowed.it should open a popup that alraedy booking done at that time choose some other time.

please suggest me.

Posted 21-Feb-11 23:00pm

mandarapu

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Sunasara Imdadhusen 22-Feb-11 5:06am

Did you try before?

Sandeep Mewara 22-Feb-11 5:14am

Ok. We got the requirement. Now, what is the issue? Where are you stuck?

mandarapu 22-Feb-11 6:03am

i need the condition that should not allow duplicates.At that time another booking should not allowed.

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Dylan Morley · Answer 1 · 2011-02-21T23:12:00

From your other questions on this, you've using a few business objects \ layers to create the booking.

So, you could probably handle this in your business layer, using the following workflow

User submits request -> business layer processes -> sql query -> meeting room already booking (sql returns results for specified range -> throw exception from business layer -> catch exception in UI

In your Business Layer Code

public void SaveConferenceDetails(ConferenceBM conference)
{
    // Validate input parameters for conference object

    // Call database code to check for existing booking, get a DataTable back or whatever. Your stored procedure should check for any existing bookings within the range start date \ end date
    DataTable bookings = YourDatabaseCode.ExecuteDataTable("SomeStoredProceudre" conference.StartDate, conference.EndDate);

    if (bookings.Rows.Count > 0)
    {
        throw new ConferenceRoomAlreadyBookedException("The meeting room is already booked");

        // NB - maybe pass bookings.Rows as event arguments so you can show what is already booked
    }

    // It's not booked, normal save
}

In your UI code

ConferenceBM confBM = new ConferenceBM();
ConferenceBL confBL = new ConferenceBL();

confBM.EmployeeName = ddlEmployeeName.SelectedItem.Text;
confBM.PurposeOfBooking = txtPurpose.Text;
confBM.StartDate = Convert.ToDateTime(txtStartDate.Text);
confBM.EndDate = Convert.ToDateTime(txtEndDate.Text);
confBM.StartTime = Convert.ToDateTime(txtStartTime.Text);
confBM.EndTime = Convert.ToDateTime(txtEndTime.Text);
confBM.ConferenceRoom = dd1conference.SelectedItem.Text;

try
{
    confBL.SaveConferenceDetails(confBM);
}
catch (ConferenceRoomAlreadyBookedException ex)
{
    // Notify client that the meeting room was already booked
}

Your spAddConferenceRoom should check for existing records and throw an error if they exist....e.g.

ALTER PROCEDURE  [dbo].[spAddConferenceRoom]

	(
		@StartDate			DATETIME,
		@EndDate			DATETIME
	)

AS

SET NOCOUNT ON

IF EXISTS(SELECT * FROM Conferences
WHERE (@StartDate BETWEEN StartDate   AND EndDate)   OR
      (@EndDate   BETWEEN StartDate   AND EndDate)   OR
      (StartDate   BETWEEN @StartDate AND @EndDate) OR
      (EndDate     BETWEEN @StartDate AND @EndDate))
BEGIN
	RAISERROR ('Cannot save details, the specified conference date is already booked',16,1)
END

--Otherwise, normal save code here...


RETURN @@ERROR
SET NOCOUNT OFF

I'd go a bit further with this. Create a procedure to check the availability before trying to save. You could then call this from AJAX so that when a user selects start \ end dates, you can show some feedback to say 'Room Available' or 'Room Not Available'

CREATE PROCEDURE  spCheckConferenceAvailability

	(
		@StartDate			DATETIME,
		@EndDate			DATETIME
	)

AS

SET NOCOUNT ON

SELECT * FROM Conferences
WHERE (@StartDate BETWEEN StartDate   AND EndDate)   OR
      (@EndDate   BETWEEN StartDate   AND EndDate)   OR
      (StartDate   BETWEEN @StartDate AND @EndDate) OR
      (EndDate     BETWEEN @StartDate AND @EndDate))

RETURN @@ERROR
SET NOCOUNT OFF
GO

You could probably optimise the date overlap checking, but should work!!