Question

这是我第一次使用后台工作者。我想检索大约20.000行的数据，将其保存在dataadapter上并显示在datagridview上

它似乎正在运行但后来消息Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding出现了。

我所做的是将Connect Timeout=90000放在连接字符串和da.SelectCommand.CommandTimeout = 2000000上，这似乎没有更好的最终结果，因为添加了几个额外的零。 :( 这就是我所做的。我该怎么做才能使它有效。谢谢

Dim da As MySqlDataAdapter
Dim resultDataTable As DataTable
Dim queryString As String

Private Sub BTNrefresh_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BTNrefresh.Click
    queryString =" LONG QUERY "
    bw.RunWorkerAsync()
End Sub

Private Sub bw_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bw.DoWork
    MethodGlobal.mySqlCon.Open()

    da = New MySqlDataAdapter(queryString, MethodGlobal.mySqlCon)
    myDataTable = New DataTable

    da.Fill(myDataTable)
    da.SelectCommand.CommandTimeout = 2000000
    Me.DGVtest.DataSource = resultDataTable 
End Sub

Private Sub backgroundworker_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    MethodGlobal.NewMysqlConnection("connection")
End Sub

backgroundworker从数据库中检索数据。超时到期

0 个答案: