导入excel怎么实现先判断sql数据库里面所在单位、姓名、电话号码三个字段是否有值，若无就新增，若有就不改变，直接跳过。

当前代码如下：（当前代码实现的是删除所在单位等于_UserGroup 的所有数据，想实现在删除前，先判断sql数据库里面所在单位、姓名、电话号码三个字段是否有值，若无就新增，若有就不改变，直接跳过。）

Dim dlg As New OpenFileDialog

dlg.Filter = "Excel文件|*.xls;*.xlsx"

If dlg.ShowDialog =DialogResult.OK Then

DataTables("干警信息").sqlDeleteFor("所在单位='"& _UserGroup & "'")

Dim t As Table = Tables("干警信息")

t.StopRedraw()

Dim Book As New XLS.Book(dlg.FileName)

Dim Sheet As XLS.Sheet = Book.Sheets(0)

For n As Integer = 1 To Sheet.Rows.Count -1

Dim r As DataRow = t.DataTable.Find("姓名 = '" & sheet(n,0).text & "'")

If r Is Nothing Then r = t.DataTable.AddNew()

For i As Integer = 0 To sheet.Cols.Count -1

Dim cname As String = sheet(0, i).text

If t.Cols.Contains(cname) Then

r(cname) = sheet(n, i).Text

End If

t.ResumeRedraw()

End If

DataTables("干警信息").LoadFilter="所在单位='"& _UserGroup & "'"

DataTables("干警信息").Load

Dim dlg As New OpenFileDialog

dlg.Filter = "Excel文件|*.xls;*.xlsx"

If dlg.ShowDialog =DialogResult.OK Then

'DataTables("干警信息").sqlDeleteFor("所在单位='"& _UserGroup & "'")

Dim t As Table = Tables("干警信息")

t.StopRedraw()

Dim Book As New XLS.Book(dlg.FileName)

Dim Sheet As XLS.Sheet = Book.Sheets(0)

For n As Integer = 1 To Sheet.Rows.Count -1

Dim r As DataRow = t.DataTable.Find("姓名 = '" & sheet(n,0).text & "' and 单位='" & sheet(n,xxx).text & "' and 电话号码='" & sheet(n,xxx2).text & "'")

If r Is Nothing Then

r = t.DataTable.AddNew()

For i As Integer = 0 To sheet.Cols.Count -1

Dim cname As String = sheet(0, i).text

If t.Cols.Contains(cname) Then

r(cname) = sheet(n, i).Text

End If

END IF

t.ResumeRedraw()

End If

DataTables("干警信息").LoadFilter="所在单位='"& _UserGroup & "'"

DataTables("干警信息").Load

谢谢有点蓝老师

备注：sheet(n,0) 某字段在excel中的实际排序列默认从0开始

Dim r As DataRow = t.DataTable.Find("姓名 = '" & sheet(n,2).text & "'and 所在单位='" & sheet(n,0).text & "' and 电话='" & sheet(n,3).text & "'")

主题：导入excel怎么实现先判断sql数据库里面所在单位、姓名、电话号码三个字段是否有值，若无就新增，若有就不改变，直接跳过。