数据来源是Excel电子表格.

使用一些For循环和.Columns.Add和.Rows.Add填充DataTable对象以从Excel工作表复制数据时,插入工作正常.这个工作代码我没有包含在这里.

但是,我正在重构代码以使用OleDbDataReader.这是我的功能：

Private Function FillDataTable(path As String,name As String) As DataTable
        Dim fullpath As String = path
        Dim wsname As String = name
        Dim dt = New DataTable()
        Try
            Dim connectionstring As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" & fullpath & "';Extended Properties= 'Excel 8.0;HDR=Yes;IMEX=1'"
            Dim commandstring As String = "Select * From " & wsname
            Using con As New OleDbConnection(connectionstring)
                Using cmd As New OleDbCommand(commandstring,con)
                    con.Open()
                    Using dr As OleDbDataReader = cmd.ExecuteReader()
                        With dt
                            For Each c In aryFieldList
                                .Columns.Add(c.FieldName,ConvertType(c.DataType))
                            Next

                            .Columns.Add("SubmID")
                            .Columns("SubmID").DefaultValue = 0

                            .Columns.Add("S_ORDER")
                            .Columns("S_ORDER").DefaultValue = 0

                            .Columns.Add("C_ORDER")
                            .Columns("C_ORDER").DefaultValue = 0
                        End With
                        dt.Load(dr)
                    End Using
                End Using
            End Using

        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
        Return dt

    End Function

当我调试时,从函数返回的DataTable包含集合中的数据,否则看起来与先前版本的代码中的DataTable相同.以下是.Update数据库的代码.这两种情况的代码都没有变化.

Dim dt = New DataTable()
    dt = FillDataTable(fullpath,wsname)

Using cn = New sqlConnection(ConfigurationManager.ConnectionStrings("Connection").ConnectionString)
    cn.Open()
    Using adp = New sqlDataAdapter()
        Dim sb As New StringBuilder

        [...StringBuilder code to build the Insert command here...]

        Dim cmd As New sqlCommand(sb.ToString,cn)

        With adp
            .InsertCommand = cmd
            .InsertCommand.Parameters.Add("SubmID",sqlDbType.Int,1,"SubmID")
            .InsertCommand.Parameters.Add("S_ORDER","S_ORDER")
            .InsertCommand.Parameters.Add("C_ORDER","C_ORDER")

            For Each p In aryFieldList
                If p.Excluded = False Then
                    .InsertCommand.Parameters.Add(p.FieldName,p.DataType,p.Length,p.FieldName)
                End If
            Next
                adp.Update(dt)

        End With 'adp
    End Using 'adp
End Using 'cn

没有例外被抛出.调试adp.Update(dt)行没有延迟,就好像查询根本没有执行一样.这是我注意到行/列添加DT和OleDB填充DT之间的唯一区别 – 成功插入数据时有一点延迟时间.

我是否遗漏了DataTable的某些基本功能或属性,或者是在Load期间继承或创建的属性？这是我还没有想到的其他事情吗？当源是手动创建的DataTable而不是OleDbReader填充的DataTable时,为什么我的sqlDataAdapter将数据插入数据库？