主题：数据库连接丢失，请教原因

Private sub Transfer()
  '获得数据库已更新时间
  '更新M1
  call updatedata_m1("SZ","399001")
  call updatedata_m1("SH","000001")
  call updatedata_m1("ZJ",cIF) 
 
  '更新笔
  if time()>#09:30:00# then
    call updatedata_B1("SZ","399001")
    call updatedata_B1("SH","000001")
  end if
  if time()>#09:15:00# then
    call updatedata_B1("ZJ",cIF) 
  end if
end sub

Private sub updatedata_m1(cmarket,cstockcode)
  dim lasttime,table,ggi,gi
  ggi=0
  table=cmarket&cstockcode&"M1"
  if cmarket="ZJ" then table="ZJIF00M1"
  call getdatatime(table,lasttime)
  set oHistoryData = marketdata.GethistoryData(cstockcode,cmarket,0) 
  if not isnull(lasttime) then
    for gi=1 to oHistoryData.count-1 
      if oHistoryData.date(gi)>=lasttime then
        ggi=gi
        exit for
      end if
    next
    if ggi=0 then exit sub
    if oHistoryData.date(ggi)<dateadd("s",40,lasttime) then
      SQL ="update "&table&" set o="&oHistoryData.open(ggi)&",h="&oHistoryData.high(ggi)&",l="&oHistoryData.low(ggi)&",c="&oHistoryData.close(ggi)&",vol="&oHistoryData.volume(ggi)&" where timemark=cast('"&oHistoryData.date(ggi)&"' as timestamp)"
      conn.execute(SQL)
      ggi=ggi+1   
    end if
  end if
  if ggi<oHistorydata.count-1 then
    for gi=ggi to oHistoryData.count-1
      SQL ="insert into "&table&"(timemark,o,h,l,c,vol) values (cast('"&oHistoryData.date(gi)&"' as timestamp),"&oHistoryData.open(gi)&","&oHistoryData.high(gi)&","&oHistoryData.low(gi)&","&oHistoryData.close(gi)&","&oHistoryData.volume(gi)&")"
      conn.execute(sql)
    next
  end if
end sub

Private sub miniupdatedata_m1(cmarket,cstockcode)
  dim lasttime,table,gi,ggi,stockcode
  ggi=0
  table=cmarket&cstockcode&"M1" 
  stockcode=cstockcode
  '从newtime表中查最新数据
  if cmarket="ZJ" then
    stockcode="IF00"
    table="ZJIF00M1"
  end if
 
  SQL="SELECT timemark as tlast FROM newtime where stockcode='"&stockcode&"' and cyc='M1'"
  rs.open SQL,conn,0,1
  lasttime=rs.Fields("tlast")
  rs.close
  set oHistoryData = marketdata.GethistoryData(cstockcode,cmarket,0) 
  for gi=oHistoryData.count-1 to 0 step -1
    'oHistoryData.date(gi)是否会有条记录与lasttime完全一致？
    if oHistoryData.date(gi)<=lasttime then
      ggi=gi
      exit for
    end if
  next
  for gi=ggi to oHistoryData.count-1 
    if oHistoryData.date(gi)<dateadd("s",40,lasttime) then
      SQL ="update "&table&" set o="&oHistoryData.open(gi)&",h="&oHistoryData.high(gi)&",l="&oHistoryData.low(gi)&",c="&oHistoryData.close(gi)&",vol="&oHistoryData.volume(gi)&" where timemark=cast('"&oHistoryData.date(gi)&"' as timestamp)"
    else
      SQL ="insert into "&table&"(timemark,o,h,l,c,vol) values (cast('"&oHistoryData.date(gi)&"' as timestamp),"&oHistoryData.open(gi)&","&oHistoryData.high(gi)&","&oHistoryData.low(gi)&","&oHistoryData.close(gi)&","&oHistoryData.volume(gi)&")"
    end if
    conn.execute(SQL)
  next  
end sub

Private sub updatedata_B1(cmarket,cstockcode)
  dim lasttime,table,ggi,gi
  ggi=0
  table=cmarket&cstockcode&"B1"
  if cmarket="ZJ" then table="ZJIF00B1"
  call getdatatime(table,lasttime) 
  set oHistoryData= marketdata.GetMinuteData(cstockcode,cmarket)
 
  if not isnull(lasttime) then
    for gi=oHistoryData.count-1 to 1  step -1
      if oHistoryData.date(gi)<=lasttime then
        ggi=gi
        exit for
      end if
    next
  end if
 
  if ggi<oHistorydata.count-1 then
    if ggi=0 then
      SQL ="insert into "&table&"(timemark,p,vol) values (cast('"&oHistoryData.date(0)&"' as timestamp),"&oHistoryData.newprice(0)&","&oHistoryData.volume(0)&")"
      conn.execute(sql)
      ggi=ggi+1
    end if
    for gi=ggi to oHistoryData.count-1
      SQL ="insert into "&table&"(timemark,p,vol) values (cast('"&oHistoryData.date(gi)&"' as timestamp),"&oHistoryData.newprice(gi)&","&(oHistoryData.volume(gi)-oHistoryData.volume(gi-1))&")"
      conn.execute(sql)
    next
  end if
  select case cmarket
    case "SH"
      sholdvol=oHistoryData.volume(oHistoryData.count-1)
    case "SZ"
      szoldvol=oHistoryData.volume(oHistoryData.count-1)
    case "ZJ"
      ifoldvol=oHistoryData.volume(oHistoryData.count-1)
  END SELECT 
end sub

private sub TransData_load()
    call marketdata.unRegReportNotify(cIF,"ZJ")
    call marketdata.unRegReportNotify("000001","SH")
    call marketdata.unRegReportNotify("399001","SZ")
    lUpdate=False
    '取消触发器
    Call Application.SetTimer(1,0) 

   
   
end sub

private sub TransData_unload()
    call marketdata.unRegReportNotify(cIF,"ZJ")
    call marketdata.unRegReportNotify("000001","SH")
    call marketdata.unRegReportNotify("399001","SZ")
    lUpdate=False
    '取消触发器
    Call Application.SetTimer(1,0) 
    'if TransData_cmdStart.caption="End Transfer" then
      conn.close
    'end if
    set conn=nothing
    set rs=nothing
   
end sub

Sub GetIF(byref MainIF)
  '得到期指主力合约
  Dim MaxVolume,count,i,report1
  MaxVolume=0
  '得到市场所有品种
  Count = MarketData.GetReportCount("ZJ")
  For i = 0 To Count-1
    Set Report1 = MarketData.GetReportDataByIndex("ZJ",i)
    if Left(Report1.Label,2) = "IF" Then
      '只处理有效合约
      if Right(Report1.Label,2) >= "01" And Right(Report1.Label,2) <= "12" Then
        If Report1.Volume > MaxVolume Then
          MainIF = Report1.Label
          MaxVolume = Report1.Volume
        End if
      end if
    End if
  Next
End Sub

sub getdatatime(ctmptable,ByRef tlasttime)
  SQL="SELECT MAX(timemark) as tlast FROM "&ctmptable
  rs.open SQL,conn,0,1
  tlasttime=rs.Fields("tlast")
  rs.close
end sub