报警记录导入不了EXCEL里不知道为什么

代码是网上抄写的，不知道为何实现不了功能

每次都是  “没有所需数据”，

代码如下

Sub OnClick(ByVal Item)    
'变量定义和初始化
Dim sPro,sDsn,sSer,sCon,conn,sSql,oRs,oCom
Dim tagDSNName
Dim m,i
Dim objExcelApp,objExcelBook,objExcelSheet,sheetname
Dim MySqlStr
Set MySqlStr = HMIRuntime.Tags("mysqlstr")
item.Enabled = False
'On Error Resume Next
sheetname="Sheet1"
'打开Excel模板
Set objExcelApp = CreateObject("Excel.Application")
objExcelApp.Visible = False
objExcelApp.Workbooks.Open "D:\zhou\WinccWriteExcel.xlsx"
objExcelApp.Worksheets(sheetname).Activate
'准备查询条件 Catalog
Set tagDSNName = HMIRuntime.Tags("@DatasourceNameRT")
tagDSNName.Read
'创建数据库联接
sPro = "Provider=WinCCOLEDBProvider.1;"
sDsn = "Catalog=CC_Alarm_co_18_02_22_10_35_24R;"
'// &tagDSNName.Value& ";"
sSer = "Data Source=.\WinCC"
sCon = sPro + sDsn + sSer
Set conn = CreateObject("ADODB.Connection")
conn.ConnectionString = sCon
conn.CursorLocation = 3
conn.Open
'定义查询的命令文本 SQL
MySqlStr.Read
sSql = "ALARMVIEW:Select * FROM AlgViewCHT WHERE DateTime>'2018-02-22 00:00:00'"
'&MySqlStr.Value
HMIRuntime.Trace "Sql is: " & sSql & vbCrLf
Set oRs = CreateObject("ADODB.Recordset")
Set oCom = CreateObject("ADODB.Command")
oCom.CommandType = 1
Set oCom.ActiveConnection = conn
oCom.CommandText = sSql
'填充数据到Excel中
Set oRs = oCom.Execute
m = oRs.RecordCount
If (m > 0) Then
oRs.MoveFirst
i=3
Do While Not oRs.EOF '是否到记录末尾，循环填写表格
objExcelApp.Worksheets(sheetname).cells(i,1).value= CStr(oRs.Fields(0).Value)
objExcelApp.Worksheets(sheetname).cells(i,2).value= CStr(oRs.Fields(1).Value)
objExcelApp.Worksheets(sheetname).cells(i,3).value= CStr(oRs.Fields(2).Value)
objExcelApp.Worksheets(sheetname).cells(i,4).value= CStr(oRs.Fields(37).Value)
oRs.MoveNext
i=i+1
Loop
oRs.Close
Else
MsgBox "没有所需数据……"
item.Enabled = True
Set oRs = Nothing
conn.Close
Set conn = Nothing
objExcelApp.Workbooks.Close
objExcelApp.Quit
Set objExcelApp= Nothing
Exit Sub
End If
'释放资源
Set oRs = Nothing
conn.Close
Set conn = Nothing
'生成新的文件,关闭Excel
Dim patch,filename
filename=CStr(Year(Now))&CStr(Month(Now))&CStr(Day(Now))&CStr(Hour(Now))+CStr(Minute(Now))&CStr(Second(Now))
patch= "d:\"&filename&"demo.xlsx"
objExcelApp.ActiveWorkbook.SaveAs patch
objExcelApp.Workbooks.Close
objExcelApp.Quit
Set objExcelApp= Nothing
MsgBox "成功生成数据文件!"
item.Enabled = True
End Sub