How to avoid inserting duplicated data into a sql database using asp.net with vb code

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1.22/5 (2 votes)

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VB

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
        Try
            If IsPostBack() Then
                Dim objConn As New SqlConnection(WebConfigurationManager.ConnectionStrings("cnxCurso").ConnectionString)
                Dim sSQL, Resul As String
                sSQL = "Insert into dbo.actor (dpi, nombre, comunidad, fecha, genero, usuario) values ('" & txtdpi.Text & "', '" & txtactor.Text & "', '" & txtcomunidad.Text & "', '" & txtfecha.Text & "', '" & genero.Text & "', '" & txtusuario.Text & "')"
                Dim objCmd As New SqlCommand(sSQL, objConn)
                objConn.Open()
                Resul = objCmd.ExecuteNonQuery
                If Resul Then
                    'MsgBox("Se ha agregado correctamente el registro")
                    respuesta.Visible = True
                    respuesta.Text = "Registro agregado"
                    Response.Redirect("mantenimiento.aspx", True)
                    objConn.Close()
 
                Else
                    'MessageBox.Show("No se agregado correctamente el registro")
                    respuesta.Visible = True
                    respuesta.Text = "Registro no agregado"
 
                End If
            End If
        Catch ex As SqlException
 
        End Try
        respuesta.Text = "Registro agregado"
 

    End Sub

Posted 14-Apr-13 12:44pm

Member 9977043

Updated 14-Apr-13 18:05pm

_Amy

v2

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eakteam · Answer 1 · 2013-04-14T13:15:00

The Easy way is to read the database 2. compare results 3 if exist do something

for example we have database called ice_cream.mdb that it have one record chocolatte...
so when u start the application it should read the records and save all the record somewhere for example in a file or something else... so when u will add new record it should read the file if record exist... when a name of record exist show a messagebox and terminate insertion! if not exist execute the query... sorry for my low english.. hope i helped you...