vb.net

As mentioned,
I'm working with VB.NET Windows Form and an Access DataBase. A table in the database stores room numbers and the reservation dates for these rooms (checkin and checkout) among other things.


Here's the code used in the search function:
 provider = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source ="
        'Change the following to your access database location
        dataFile = "C:\Users\fongf\Desktop\FYP_Database\FYP.accdb"
        connString = provider & dataFile
        myConnection.ConnectionString = connString

        myConnection.Open()
        'the query:
        Dim cmd As String = "SELECT * FROM Reservation WHERE (checkin > " & "#" & DateTimePicker1.Text & "#" & " and checkin > " & "#" & DateTimePicker2.Text & "#" & ")" & " or " & "(checkOut < " & "#" & DateTimePicker2.Text & "#" & " and checkOut < " & "#" & DateTimePicker1.Text & "#" & ")"
        Dim dr As OleDbDataReader = cmd.ExecuteReader



        If reservation = True Then
            MsgBox("Sorry, this room was booked", MsgBoxStyle.OkOnly, "Invalid Login")
        Else
            MsgBox("all is ok")
        End If
        myConnection.Close()

Sorry if the question seems silly, but I haven't had much experience dealing with databases and time. Your help or pointing me to a source with good information on this would be greatly appreciated. Thank you.
gary chiamAsked:
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Éric MoreauSenior .Net ConsultantCommented:
I see 2 things.

The first one is that your query (a string) is named cmd (probably for Command) but a string does not have a ExecuteReader method. A command has. Have a look at https://msdn.microsoft.com/en-us/library/979byfca(v=vs.110).aspx

The second thing is about the query. With all the concatenation you are doing, it is somewhat hard to read. Also the BETWEEN operator would make it clearer (at least for me):

        Dim sql As String = "SELECT * FROM Reservation WHERE (checkin BETWEEN #" + DateTimePicker1.Value.Tostring("yyyy/MM/dd") & "# and #" & DateTimePicker2.Value.Tostring("yyyy/MM/dd") & "# ) or (checkOut BETWEEN #" & DateTimePicker2.Value.Tostring("yyyy/MM/dd") & "# and #" & DateTimePicker1.Value.Tostring("yyyy/MM/dd") & "#)"

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gary chiamAuthor Commented:
Mr.Eric , can you show me some example about how to do the availability of hotel room with room number , checkIn (datetimepicker1)  and checkOut(datetimepicker2) ?
Your help i really  appreciated.
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Éric MoreauSenior .Net ConsultantCommented:
without having a database table structure, I would say that the query here above is good.

Your second link is showing you to use an OleDbCommand exactly like I told you.
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
How's your window form's interface looks like?

can you provide the table structures with sample data?
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Éric MoreauSenior .Net ConsultantCommented:
I received a Thumbs up on that comment from the asker
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