Comme vous n'avez pas indiqué à quoi vous avez spécifiquement besoin d'aide, je vais commencer par vous donner la simple requête pour effectuer la mise à jour, puis je vais vous montrer comment interagir avec Access.
La requête de mise à jour datereturned:
str = "UPDATE 'Your Table Name' SET datereturned = " & now ' This is your update query.
La première chose à faire est de créer une connexion au Access Database:
Dim connectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0; Ole DB Services=-4; Data Source=D:\Tecnical Stu"& _
"dy\Complete_Code\Ch08\data\NorthWind.mdb"
Dim dbConnection As System.Data.IDbConnection = New System.Data.OleDb.OleDbConnection(connectionString)
Trouvé à:
http://p2p.wrox.com/ado-net/28703-how-vbulletin-net-connect-access-database.html
Suivant vous devez effectuer la mise à jour:
dbConnection .Open()
str = "UPDATE 'Your Table Name' SET datereturned = " & now ' This is your update query.
'string stores the command and CInt is used to convert number to string
cmd = New OleDbCommand(str, cn)
icount = cmd.ExecuteNonQuery
Voici une classe qui vous permettra d'effectuer les interactions, facilement et simplement.
Imports System.Data.OleDb
Public Class Form1 Inherits System.Windows.Forms.Form
Dim cn As OleDbConnection
Dim cmd As OleDbCommand
Dim dr As OleDbDataReader
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e as _
System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As_
System.EventArgs) Handles Button1.Click
Try
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;_
Data Source=C:\emp.mdb;")
'provider to be used when working with access database
cn.Open()
cmd = New OleDbCommand("select * from table1", cn)
dr = cmd.ExecuteReader
While dr.Read()
TextBox1.Text = dr(0)
TextBox2.Text = dr(1)
TextBox3.Text = dr(2)
' loading data into TextBoxes by column index
End While
Catch
End Try
dr.Close()
cn.Close()
End Sub
End Class
When you run the code and click the Button, records from Table1 of the Emp database will be displayed in the TextBoxes.
Retrieving records with a Console Application
Imports System.Data.OleDb
Imports System.Console
Module Module1
Dim cn As OleDbConnection
Dim cmd As OleDbCommand
Dim dr As OleDbDataReader
Sub Main()
Try
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\emp.mdb;_
Persist Security Info=False")
cn.Open()
cmd = New OleDbCommand("select * from table1", cn)
dr = cmd.ExecuteReader
While dr.Read()
WriteLine(dr(0))
WriteLine(dr(1))
WriteLine(dr(2))
'writing to console
End While
Catch
End Try
dr.Close()
cn.Close()
End Sub
End Module
Code for Inserting a Record
Imports System.Data.OleDb
Public Class Form2 Inherits System.Windows.Forms.Form
Dim cn As OleDbConnection
Dim cmd As OleDbCommand
Dim dr As OleDbDataReader
Dim icount As Integer
Dim str As String
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As_
System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As_
System.EventArgs) Handles Button2.Click
Try
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\emp.mdb;")
cn.Open()
str = "insert into table1 values(" & CInt(TextBox1.Text) & ",'" & TextBox2.Text & "','" &_
TextBox3.Text & "')"
'string stores the command and CInt is used to convert number to string
cmd = New OleDbCommand(str, cn)
icount = cmd.ExecuteNonQuery
MessageBox.Show(icount)
'displays number of records inserted
Catch
End Try
cn.Close()
End Sub
End Class
à l'adresse:
http://www.startvbdotnet.com/ado/msaccess.aspx
informations insuffisantes pour répondre –
dites-moi, ce qui manque dans ma déclaration? – RedKing
Je pense que vous devez faire plus de travail sur votre conception de table. Si productnumber est une clé primaire, il ne peut être "emprunté" et "retourné" qu'une seule fois ... –