Question

我们已将一些后端数据表从网络驱动器（mbd文件）移到SQL Server数据库上。事情通常很有效，但如果员工通过VPN访问事物（这会减慢很多事情），那么当我们运行检索大量数据的报告时，我们会收到连接错误。我的猜测是我需要将超时设置为更大的值，我做了一些研究，似乎我需要设置commandtimeout（或者可能是查询超时？）。

下面是我们用来将SQL Server表/视图从SQL Server后端连接到Access前端的VBA代码。我是对的，我可能需要指定一个命令超时？在这里我们会添加commandtimeout（或其他超时）值吗？

Public Sub CreateSQLLinkedTable(strSourceTableName As String, strNewTableName As String)

'************************************************************************************
'* Create a linked table in the current database from a table in a different SQL Server file.
'* In:                                                                              *
'*   strNewTableName - name of linked table to create                               *
'*   strSourceTableName - name of table in database                             *
'************************************************************************************

Setup:

    Dim tdf As TableDef
    Dim strConnect As String, strMsg As String
    Dim myDB As Database

    ' set database vars
    Set myDB = CurrentDb
    Set tdf = myDB.CreateTableDef(strNewTableName)

MakeConnections:

    On Error GoTo OnError

    ' turn system warnings off
    DoCmd.SetWarnings False

    ' define connect string and source table
    ' We do not need to specify the username (Uid) and password (Pwd) in this connection
    ' string, because that information is already cached from the connection to the SQL
    ' Projects database that we created in CheckSQLConnection() that was run to check connection
    ' to the database.  So here we can have a connection string without the Uid and Pwd.
    With tdf
        .Connect = "ODBC;Driver={SQL Server};" & _
                  "server=" & myServer & ";" & _
                  "database=" & mySQLDB & ";"

        .SourceTableName = strSourceTableName
    End With

    ' execute appending the table
    myDB.TableDefs.Append tdf

    ' turn system warnings back on
    DoCmd.SetWarnings True

ExitProgram:
    ' this block of code will run if there are no errors

    Exit Sub

OnError:
    ' this block of code runs if there is an error, per On Error assignment above

    ' display error message with details
    MsgBox "There was an error connecting to the SQL Server data source Projects. Error = " & err & ", Description: " & err.Description

    'exit Projects
    Call CloseFormsAndQuit

End Sub

Answer 1

有一个ODBC超时属性。在设计视图中打开查询，然后转到属性以查看它。当前数据库属性页面上还有一个（ODBC）查询超时。您也可以通过编程方式设置它：

Dim objDB As DAO.Database
Set objDB = CurrentDb()
objDB.QueryTimeout = 120

http://www.geeksengine.com/article/how-to-change-timeout-value-for-access-sql.html
另请检查服务器配置。服务器端有一个查询超时。

在Access前端为链接的SQL表/视图设置commandtimeout

1 个答案: