没有网络连接，MySQL连接器无法工作

Question

我正在使用MySQL和VB.Net创建小型数据库程序。我使用WampServer for MySQL和MySQL 6.9.8连接器。当我连接到互联网时，所有代码都正常工作，但是当我断开连接时，它显示“未找到数据库”错误。我的数据库本地存储在Wamp phyMyAdmin

中

这是我的代码

Try
    If conn.State = ConnectionState.Closed Then
        conn.ConnectionString = "DATABASE=" & My.Settings.myDB & ";" _
            & "SERVER=" & My.Settings.myServer & ";user id=" & My.Settings.myUsername _
            & ";password=" & My.Settings.myPassword & ";port=" & _
            My.Settings.myPort & ";charset=utf8;Convert Zero Datetime=True"
        conn.Open()
    End If
Catch myerror As Exception
    MessageBox.Show("Error Connecting to the database", "Error Database Server", _
        MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
    End
End Try

这是我的其他代码;

Try
    mdlCon.conn.Open()
    Dim rd As MySqlDataReader
    Dim cmd As New MySqlCommand
    Dim dt As New DataTable

    cmd.CommandText = "select * from studentdeatil Order by sid DESC"
    cmd.Connection = mdlCon.conn
    rd = cmd.ExecuteReader
    dt.Load(rd)
    rd.Close()
    For Each rowD As DataRow In dt.Rows
        Dim dgvRow As String() = New String() {rowD.Item(3), rowD.Item(1), rowD.Item(2), rowD.Item(4), rowD.Item(5), rowD.Item(6), rowD.Item(7), rowD.Item(8), rowD.Item(9), rowD.Item(10), "", "OLD", rowD.Item(0)}
        DataGridView1.Rows.Add(dgvRow)
    Next
Catch ex As Exception
    MessageBox.Show(ex.Message)
End Try