Question

任何人都可以帮我更新/编辑图片框中的某些图片到数据库ms access 2007吗？

我正在使用此代码：

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        Dim myCommand As New OleDbCommand
        Dim SQL As String
        Dim ms As New System.IO.MemoryStream
        Dim bmpImage As New Bitmap(PictureBox1.Image)

        Try
            If Not con.State = ConnectionState.Open Then Open_Koneksi()

            SQL = "UPDATE tb_pegawai SET nama=@nama, tgl_lahir=@tgl_lahir, gender=@gender, jabatan=@jabatan, alamat=@alamat, telepon=@telepon, foto=@image  WHERE nik=@nik"
            myCommand.Parameters.AddWithValue("@nik", TextBox1.Text)
            myCommand.Parameters.AddWithValue("@nama", TextBox2.Text)
            myCommand.Parameters.AddWithValue("@tgl_lahir", DateTimePicker1.Text)
            myCommand.Parameters.AddWithValue("@gender", jk.Text)
            myCommand.Parameters.AddWithValue("@jabatan", ComboBox1.Text)
            myCommand.Parameters.AddWithValue("@alamat", TextBox4.Text)
            myCommand.Parameters.AddWithValue("@telepon", TextBox5.Text)

            bmpImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg)
            bytImage = ms.ToArray()
            ms.Close()

            myCommand.Parameters.AddWithValue("@image", bytImage)

            MsgBox("Data saved")

            myCommand.Connection = con
            myCommand.CommandText = SQL
            myCommand.ExecuteNonQuery()

            Data_Load()
            con.Close()

        Catch myerror As OleDbException
            MessageBox.Show("Error: " & myerror.Message)
            Button1.Enabled = False
        Finally
            con.Dispose()


        End Try
    End Sub

当我运行程序时，没有出现错误或任何错误。但图片不会出现在ms访问

上

Answer 1

Access可以使用参数。我已经无数次地使用它了。我的访问更新查询的基本函数添加如下参数：

Dim parameter As OleDbParameter = New OleDbParameter("@parameterKey", parameterValue)
            command.Parameters.Add(parameter)

您还应该事先创建连接。这是我经过充分测试的访问更新功能解决方案。

    Function UpdateACCDB(ByRef connectionString As String, ByVal table As String, ByVal ColumnsAndValues As Dictionary(Of String, Object), ByRef whereColumn As String, ByRef whereParameter As Object)

    table = "[" + table + "]"
    Dim sqlStatement As String = "UPDATE " + table + " SET "

    Dim rowsUpdated As Integer = 0

    For Each pair As KeyValuePair(Of String, Object) In ColumnsAndValues

        sqlStatement += "[" + pair.Key + "]" + "=" + "@" + pair.Key + ","
    Next

    sqlStatement = sqlStatement.Substring(0, sqlStatement.Length - 1)

    sqlStatement += " WHERE " + whereColumn + "=@WHERE" + whereColumn

    Using connection As New OleDbConnection(connectionString)

        Dim command As New OleDbCommand(sqlStatement, connection)

        ''Set parameter for columns to be updated
        For Each pair As KeyValuePair(Of String, Object) In ColumnsAndValues
            Dim parameter As OleDbParameter = New OleDbParameter("@" + pair.Key, pair.Value)
            command.Parameters.Add(parameter)
        Next

        ''Set parameter for where clause column
        command.Parameters.Add(New OleDbParameter("@WHERE" + whereColumn, whereParameter))
        Try
            command.Connection.Open()
            rowsUpdated = command.ExecuteNonQuery()
            command.Connection.Close()
        Catch ex As Exception
            Throw ex
        Finally
            If Not IsNothing(command) AndAlso Not IsNothing(command.Connection) AndAlso command.Connection.State = ConnectionState.Open Then
                command.Connection.Close()
            End If
        End Try
    End Using
    Return rowsUpdated
End Function

如您所见，columnNames及其值以字典形式提供。

如何将图像从图片框更新/存储到数据库（MS Access2007）

1 个答案: