Question

我有一个程序需要更新dbf文件中的数据。但它会出现错误'操作符/操作数类型不匹配'。这是示例代码：

    Dim con As OleDbConnection = New OleDbConnection("Provider=vfpoledb;Data Source=C:\folder\paytran.dbf;Collating Sequence=machine;")
    Try


        Dim strSQL As String = "UPDATE paytran.dbf SET workhr = 20  WHERE empno = 102"
        Dim cmd As OleDbCommand = New OleDbCommand(strSQL, con)
        con.Open()
        Dim myDA As OleDbDataAdapter = New OleDbDataAdapter(cmd)
        Dim myDataSet As DataSet = New DataSet()
        ' Using DataAdapter object fill data from database into DataSet object
        myDA.Fill(myDataSet, "MyTable")
        ' Binding DataSet to DataGridView
        DGV.DataSource = myDataSet.Tables("MyTable").DefaultView
        con.Close()
        con = Nothing
    Catch ex As Exception
        MessageBox.Show(ex.Message, "Error Select Data")

    Finally
        If con IsNot Nothing Then
            con.Close()
        End If
    End Try

请帮帮我..

Answer 1

它是你的连接字符串。连接字符串应该只需指向数据文件所在的PATH，然后所有基于SQL的命令将默认能够在该路径中查看任何.DBF表（或者如果存在子路径则转发）。

Data Source=C:\folder

而不是

Data Source=C:\folder\paytran.dbf

所以，现在如果你在“C：\文件夹”中有30个表，你现在可以根据需要从所有表中查询。

Answer 2

您需要明确打开和关闭DBF。尝试：

Dim strSQL As String = "Use paytran in 0 shared;UPDATE paytran SET workhr = 20  WHERE empno = 102;use in select('paytran')"

更新dbf文件时，operator / operand类型不匹配

2 个答案: