Add dates into a database with recurrence possibility VB.NET

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I've been struggling with a recurrence mode for inserting my dates into a database.
I'm capable of adding StartDays and EndDates, I didn't find a good way of recurring my days over a period of time.
The user must be capable of repeating the event daily, weekly, monthly and yearly.
All the tutorials on the internet are either for ASP.NET/C#. I'm using VB.NET and an Access database.
Thanks in advance.

Posted 18-Apr-15 13:23pm

Member 11385046

Updated 25-Jul-19 10:23am

Sergey Alexandrovich Kryukov

v3

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PIEBALDconsult 18-Apr-15 19:32pm

You won't like it, but : http://en.wikipedia.org/wiki/ISO_8601#Repeating_intervals

Member 11385046 18-Apr-15 19:38pm

So is there some way of implementing this into VB code ?

Sergey Alexandrovich Kryukov 18-Apr-15 19:36pm

What do you mean by "VB". What does it mean, ASP/C#? I never heard about C# used with ASP. If you mean "APS.NET", this is not ASP.
—SA

Member 11385046 18-Apr-15 19:44pm

I'm currently writing the local program in VB.NET. All the tutorials for recurring dates are either written in C# or ASP.NET.

Sergey Alexandrovich Kryukov 18-Apr-15 19:48pm

Good, thank your for the clarification. Then better click "Improve question" and add this ".NET" to "VB", and "ASP", to make your post not so confusing. You are the one who is interested in that the most.
Also, it will be useful to define exactly how "recurring" should work. I don't think it's clear.
—SA

Member 11385046 18-Apr-15 19:49pm

Thanks for the information, question is updated !

Sergey Alexandrovich Kryukov 18-Apr-15 19:51pm

No problem, but you missed two more places which I updated for you... :-)
—SA

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Maciej Los · Accepted Answer · 2015-04-18T23:04:00

Solution 1

If i understand you well...

MS Access database does not supports recurrence in queries. You have to write method as below:

VB

Dim startDate As Date = Date.Today()
Dim endDate As Date = startDate.AddDays(15)
Dim currDate As Date = startDate

Do While (currDate < endDate)
    Console.WriteLine("INSERT INTO TableName (StartDate, EndDate) VALUES ({0}, {1})", currDate, endDate)
    currDate = currDate.AddDays(1)
Loop

As you can see, i'm using Do... Loop[^] statement to loop through the dates.

Posted 18-Apr-15 23:04pm

Maciej Los

Comments

Member 11385046 19-Apr-15 9:19am

Thank you,
I have been trying to replace the Console.Writeline command with Oledb commands.
It's not working and giving an error : http://i.imgur.com/WqB1k3v.png
Is there any way of solving this ?
Public Class Manual

Private Sub Manual_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
'Commands & connections
Dim con As New OleDb.OleDbConnection
Dim cmd As New OleDb.OleDbCommand
Dim Sql As String
con.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\TonesToDoList\1tabel1.accdb"
con.Open()
'Recurrence
Dim startDate As Date = Date.Today()
Dim endDate As Date = startDate.AddDays(15)
Dim currDate As Date = startDate

Do While (currDate < endDate)
Sql = ("INSERT INTO tblManual (StartDate, EndDate)" & "VALUES ({0}, {1})", currDate, endDate)
cmd.ExecuteNonQuery()
currDate = currDate.AddDays(1)
Loop
con.Close()
End Sub

End Class

Maciej Los 19-Apr-15 12:30pm

Replace this: Sql = ("INSERT INTO tblManual (StartDate, EndDate)" & "VALUES ({0}, {1})", currDate, endDate) with: Sql = String.Format("INSERT INTO tblManual (StartDate, EndDate) VALUES (#{0}#, #{1}#)", currDate, endDate)

Member 11385046 19-Apr-15 13:25pm

The current code does not add anything into the database. Code runs without errors though.

Public Class Form1

Private Sub Recurrence_Click(sender As System.Object, e As System.EventArgs) Handles Recurrence.Click
'Delcareren
Dim cnnRecurrence As New OleDb.OleDbConnection
Dim scmdRecurrence As New OleDb.OleDbCommand
Dim SQL As String
'Connectionstring
cnnRecurrence.ConnectionString = My.Settings._1tabel1ConnectionString
scmdRecurrence.Connection = cnnRecurrence
cnnRecurrence.Open()
'Recurrence
Dim startDate As Date = Date.Today()
Dim endDate As Date = startDate.AddDays(15)
Dim currDate As Date = startDate
Do While (currDate < endDate)
SQL = String.Format("INSERT INTO tblManual (StartDate, EndDate) VALUES (#{0}#, #{1}#)", currDate, endDate)
currDate = currDate.AddDays(1)
Loop
cnnRecurrence.Close()
End Sub
End Class

Maciej Los 19-Apr-15 13:29pm

Because you never call:

'REM: after SQL = String.Format("...")
scmdRecurrence.CommandText = SQL
scmdRecurrence.ExecuteNonQuery()
'REM: before currDate = ....

:)

Member 11385046 19-Apr-15 13:55pm

Thank you ,that's successful ! So this is for daily occasions so how do I add monthly/weekly/yearly events?

Maciej Los 19-Apr-15 14:12pm

Use the same logic and DateTime.AddMonth() method [^] and/or AddYears() method ;)
Please, accept my answer (green button) - formally to remove your question from unanswered list.

Bartt_dmr 25-Jul-19 16:24pm

Please, can you help me.

I adapted the example above to asp.net (vb), but it records the same date.

Ex: 08/01/2019 to 08/31/2019, interval of 7 days.

The correct would be to record 08/01 ... 08/08 ... 15/08 ... 22/08 ... 29/08 ... But recorded the 5 days as 01/08.

Follows the code and thanks in advance.

Dim conexao As SqlConnection
Dim cmd As SqlCommand
Dim sql As String

Dim startDate As Date = txtDataCurso.Text
Dim endDate As Date = startDate.AddDays(txtIntervalo.Text) - "This interval is the number of days (end date - initial)"
Dim currDate As Date = startDate

Do While (currDate < endDate)

sql = "INSERT INTO tre_Eventos (Id_Curso, DataEvento) VALUES ('" & ddlCursos.SelectedValue & "', '" & endDate & "')"

currDate = currDate.AddDays(7)

Try

conexao = New SqlConnection(strConn)

conexao.Open()

cmd = New SqlCommand(sql, conexao)

cmd.ExecuteNonQuery()

conexao.Close()

SetFocus(Label1)

Label1.Visible = True
Label1.Text = "Evento Cadastrado com Sucesso"

Catch

SetFocus(Label1)

Label1.Visible = True
Label1.Text = "Ocorreu um erro!" + Err.Description

End Try