希望您能帮助我解决这个问题。
我有一个包含146,459行的Excel文件,我需要删除空白单元格以统一我的数据。这是我的意思的图片:
当我选择所有空格时,我的笔记本电脑大约需要2分钟,但是当我尝试从一个或多个列中删除单元格并向上移动时,Excel冻结并且什么也没有发生。像这样,我已经离开笔记本电脑超过1个小时,但没有任何结果。
您知道是否有办法做到这一点,或者是否可以实施其他选择?
谢谢!
答案 0 :(得分:2)
即使在联盟进行了优化的情况下,穿过细胞的循环也要花费很长时间。 下面的代码在模仿的数据集上进行了测试,该数据集包含5列x 200,000条记录,并在5.5秒内完成。
设置: 假设您的源数据在名为“源”的工作表中的范围为“ A1:E200000”,并且您希望在名为“目标”的工作表中的相似范围中的干净数据。
代码:
::
工作原理: 子Remove_Empty_Cells按列循环遍历源范围,并调用子“ Clean_Column”从提供的列中删除空单元格。
Clean_Column使用MSXML2.DOMDocument对象将所有列单元格加载到ADO记录集中。然后,对记录集进行过滤以查找非空行,并将结果复制到目标列。所有这些操作在VBA中都非常快。
理想情况下,我希望立即将整个范围加载到一个记录集中,但是不幸的是,VBA函数CopyFromRecordset不允许逐字段粘贴记录集。因此,我们必须逐列加载数据(如果有人知道更好的方法,我很乐意看到它)。
一些警告:
[编辑]: 使用数组实现的替代解决方案。同一数据集5x 200,000和40,000个有效记录的清除时间不到1秒。可以进一步优化它,我只是制作了一个快速演示的原型。
Option Explicit
Sub Remove_Empty_Cells()
Dim Source As Range
Dim Target As Range
Dim i As Integer
Set Source = ThisWorkbook.Sheets("Source").Range("A1:E200000")
Set Target = ThisWorkbook.Sheets("Target").Range("A1:E200000")
For i = 1 To Source.Columns.Count
Clean_Column Source.Columns(i), Target.Columns(i)
Next i
End Sub
Sub Clean_Column(Source As Range, Target As Range)
Dim rs As Object
Dim XML As Object
Set XML = CreateObject("MSXML2.DOMDocument")
XML.LoadXML Source.Value(xlRangeValueMSPersistXML)
Set rs = CreateObject("ADODB.Recordset")
rs.Open XML
rs.Filter = rs.Fields(0).Name & "<>null"
Target.CopyFromRecordset rs
End Sub
答案 1 :(得分:2)
使用数组是处理大范围单元格的最快方法或最快方法之一。
开始于:
运行代码:
Option Explicit
Sub delBlanks()
Dim i As Long, j As Long, k As Long, arr As Variant, vals As Variant
Dim s As Double, e As Double, c As Long
s = Timer
With Worksheets("sheet6")
If .AutoFilterMode Then .AutoFilterMode = False
'data validity check
c = Application.CountA(.Columns(1))
For j = 2 To 5
If c <> Application.CountA(.Columns(j)) Then Exit For
Next j
If j <= 5 Then
Debug.Print "GIGO, waste of time to continue"
Exit Sub
End If
'collect offset values
vals = .Range(.Cells(2, "A"), .Cells(.Rows.Count, "E").End(xlUp)).Value2
ReDim arr(LBound(vals, 1) To UBound(vals, 1), _
LBound(vals, 2) To UBound(vals, 2))
'loop through array coolating A"E to a single row
i = LBound(vals, 1)
k = LBound(arr, 1)
Do
For j = LBound(vals, 2) To UBound(vals, 2)
Do While vals(i, j) = vbNullString: i = i + 1: Loop
arr(k, j) = vals(i, j)
Next j
i = i + 1: k = k + 1
Loop Until i > UBound(vals, 1)
'put data back on worksheet
.Cells(2, "A").Resize(UBound(arr, 1), UBound(arr, 2)) = arr
.Cells(2, "C").Resize(UBound(arr, 1), 1).NumberFormat = "dd/mm/yyyy"
End With
e = Timer
Debug.Print c - 1 & " records in " & UBound(vals, 1) & _
" rows collated in " & Format((e - s), "0.000") & " seconds"
End Sub
结果:
30000 records in 157500 rows collated in 0.984 seconds
种子数据:
以下内容用于复制OP“图像中的样本数据”。
Sub fillBlanks()
Dim i As Long, j As Long, k As Long, arr As Variant, vals As Variant
vals = Array("to: ""someone"" <someone@null.com", "from: ""no one"" <no_one@null.com", _
Date, "\i\m\p\o\r\t\a\n\c\e\: 0", "subject: something nothing")
ReDim arr(1 To 6, 1 To 5)
With Worksheets("sheet6")
.Cells(1, 1).CurrentRegion.Offset(1, 0).Clear
For k = 1 To 30000
j = 0
For i = LBound(arr, 2) To UBound(arr, 2)
If i = 2 And Not CBool(k Mod 4) Then j = j + 1
If i = 4 Then
arr(i + j, i) = Format(k, vals(i - 1))
Else
arr(i + j, i) = vals(i - 1)
End If
Next i
.Cells(.Rows.Count, 5).End(xlUp).Offset(1, -4).Resize(UBound(arr, 1), UBound(arr, 2)) = arr
ReDim arr(1 To 6, 1 To 5)
Next k
End With
End Sub