数据库仅存储一行

Question

我需要创建一个数据库，它只能在form1上的文本框中存储三个值。每次我点击按钮，它都会存储在这些文件上。

这是必需的，因为我需要在报告上创建图表。为了创建报告，我需要使用数据库（因为没有其他方法）。

那么这是最好的解决方案。目前我正在创建这样的图表但是无法在.rdlc MS报表上设置此图表。

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    With Me.chrtRegisterAvailability
        .Legends.Clear()
        .Series.Clear()
        .ChartAreas.Clear()
    End With

    Dim areas1 As ChartArea = Me.chrtRegisterAvailability.ChartAreas.Add("Areas1")

    'With areas1
    'End With

    Dim series1 As Series = Me.chrtRegisterAvailability.Series.Add("Series1")

    With series1
        .ChartArea = areas1.Name
        .ChartType = SeriesChartType.Pie
        .Points.AddXY("Website Impressions", TextBox1.Text)
        .Points.AddXY("Social Media", TextBox2.Text)
        .Points.AddXY("Clicks", textbox3.text)
    End With

    Dim T As Title = chrtRegisterAvailability.Titles.Add("Visits by Traffic Source")
    With T
        .ForeColor = Color.Black
        .BackColor = Color.LightBlue
        .Font = New System.Drawing.Font("Times New Roman", 9.0F, System.Drawing.FontStyle.Bold)
        .BorderColor = Color.Black
    End With
    Dim legends1 As Legend = Me.chrtRegisterAvailability.Legends.Add("Legends1")
End Sub