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试图列出从 tally 到 odbc 的所有分类帐。一无所获。Mycode如下，执行时没有报错。但不将分类帐列表显示到 datagridview1

  Try

        Dim TalCon As OdbcConnection

        TalCon = New OdbcConnection("DSN=TallyODBC_9000;PORT=9000;DRIVER=Tally ODBC Driver;SERVER={(local)}")

        Dim Taldr As OdbcDataReader


        Dim cmd As New OdbcCommand("SELECT $Name FROM Ledger")

        TalCon.Open()

        cmd.Connection = TalCon

        Taldr = cmd.ExecuteReader()
        While Taldr.Read
            DataGridView1.DataSource = Taldr


        End While

        'displaying connection name to verify
        TextBox1.Text = TalCon.ToString

        Taldr.Close()

    Catch ex As Exception
        MsgBox("Master " & vbCrLf & ex.Message)
    End Try




End Sub
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2 回答 2

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我很好奇您使用的数据库需要 ODBC 并且没有特定的提供程序。

我已将您的代码分为用户界面代码和数据库代码。这使得它更容易维护。

Connection、Command 和 DataReader 等数据库对象必须关闭并释放。Using...End Using即使有错误，块也会处理这个问题。

您可以将CommandTextandConnection直接传递给Command.

更新用户界面时不要保持连接打开。相比之下，这是一个漫长的过程，并且太长而无法保持连接打开

这没有任何意义。您将DataSource多次重置为相同的值。但是，它无论如何都不起作用，因为 DataReader 不是有效的DataSource. 请参阅https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.datagridview.datasource?view=netframework-4.8&f1url=%3FappId%3DDev16IDEF1%26l%3DEN-US%26k%3Dk (System.Windows.Forms.DataGridView.DataSource)%3Bk(TargetFrameworkMoniker-.NETFramework%2CVersion%253Dv4.8)%3Bk(DevLang-VB)%26rd%3Dtrue#remarks

While Taldr.Read
            DataGridView1.DataSource = Taldr
End While

如果您所做的Catch只是显示一个消息框，请在用户界面中显示它。

Private ConStr As String = "DSN=TallyODBC_9000;PORT=9000;DRIVER=Tally ODBC Driver;SERVER={(local)}"

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Try
        DataGridView1.DataSource = GetNames()
    Catch ex As Exception
        MessageBox.Show(ex.Message)
    End Try
End Sub

Private Function GetNames() As DataTable
    Dim dt As New DataTable
    Using cn As New OdbcConnection(ConStr),
        cmd As New OdbcCommand("SELECT $Name FROM Ledger", cn)
        cn.Open()
        Using reader = cmd.ExecuteReader
            dt.Load(reader)
        End Using
    End Using
    Return dt
End Function
于 2021-04-30T20:30:13.960 回答
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即使您的问题已解决，我仍在回复线程由于您使用的是依赖于 ODBC 驱动程序的 ODBC 连接，如果您更改系统或想要使用多个系统，您会遇到问题

从计数中获取数据的更好方法是使用 XML API，您无需更改任何配置，您可以使用与 ODBC 相同的配置因为您只需要分类帐名称，您可以使用下面的代码来获取分类帐名称并发布到数据a2 在标签中更改 XML 中的公司名称，<SVCURRENTCOMPANY>ABC Company</SVCURRENTCOMPANY>甚至在标签中打开了多个公司，它从目标公司获取数据

Public Sub GetTallyLedgersList()
Dim xmlhttp As New MSXML2.XMLHTTP60, myurl As String

Dim objXML As New MSXML2.DOMDocument60

myurl = "http://localhost:9000"
xmlhttp.Open "POST", myurl, False
xmlhttp.send "<ENVELOPE><HEADER><VERSION>1</VERSION>
<TALLYREQUEST>Export</TALLYREQUEST><TYPE>Data</TYPE><ID>List Of Ledgers</ID></HEADER><BODY><DESC><STATICVARIABLES><SVEXPORTFORMAT>$$SysName:XML</SVEXPORTFORMAT><SVCURRENTCOMPANY>ABC Company</SVCURRENTCOMPANY></STATICVARIABLES>" & _
    "<TDL><TDLMESSAGE><REPORT ISMODIFY=""No"" ISFIXED=""No"" ISINITIALIZE=""No"" ISOPTION=""No"" ISINTERNAL=""No"" NAME=""List Of Ledgers""><FORMS>List Of Ledgers</FORMS></REPORT><FORM ISMODIFY=""No"" ISFIXED=""No"" ISINITIALIZE=""No"" ISOPTION=""No"" ISINTERNAL=""No"" NAME=""List Of Ledgers"">" & _
    "<TOPPARTS>List Of Ledgers</TOPPARTS><XMLTAG>ListOfLedgers</XMLTAG></FORM><PART ISMODIFY=""No"" ISFIXED=""No"" ISINITIALIZE=""No"" ISOPTION=""No"" ISINTERNAL=""No"" NAME=""List Of Ledgers""><TOPLINES>List Of Ledgers</TOPLINES><REPEAT>List Of Ledgers : FormList Of Ledgers</REPEAT><SCROLLED>Vertical</SCROLLED>" & _
    "</PART><LINE ISMODIFY=""No"" ISFIXED=""No"" ISINITIALIZE=""No"" ISOPTION=""No"" ISINTERNAL=""No"" NAME=""List Of Ledgers""><LEFTFIELDS>NAME</LEFTFIELDS></LINE><FIELD ISMODIFY=""No"" ISFIXED=""No"" ISINITIALIZE=""No"" ISOPTION=""No"" ISINTERNAL=""No"" NAME=""NAME""><SET>$NAME</SET><XMLTAG>NAME</XMLTAG></FIELD>" & _
    "<COLLECTION ISMODIFY=""No"" ISFIXED=""No"" ISINITIALIZE=""No"" ISOPTION=""No"" ISINTERNAL=""No"" NAME=""FormList Of Ledgers""><TYPE>Ledger</TYPE></COLLECTION></TDLMESSAGE></TDL></DESC></BODY></ENVELOPE>"

Set objXML = New MSXML2.DOMDocument60
k = xmlhttp.responseText
If Not objXML.LoadXML(k) Then  'strXML is the string with XML'
    Err.Raise objXML.parseError.ErrorCode, , objXML.parseError.reason
End If
Set Nameslist = objXML.SelectNodes("//LISTOFLEDGERS/NAME")
 
 Count = 2
 ActiveSheet.Cells(1, 1).Value = "Ledger Names"
For Each Name In Nameslist
s = Name.nodeTypedValue
ActiveSheet.Cells(Count, 1).Value = s
Count = Count + 1
Next

End Sub
于 2021-06-11T06:53:08.627 回答