为什么我的Lua.js脚本覆盖我的CSV文件？

Question

我正在记录能源系统中的某些对象。因此，我在本地创建CSV文档。问题是，脚本运行时每隔15分钟就会覆盖前15分钟的数据。我希望它每天创建一个CSV文件（WORKS）将当天的所有数据写入其中（仅最后15分钟）

--require('socket.ftp')

-- ftp file
--ftpfile = string.format('ftp://ftplogin:[email protected]/%s.csv', os.date('%Y-%m-%d_%H-%M'))
--local ftp gebruiken
ftpfile = string.format('/home/ftp/%s.csv', os.date('%Y-%m-%d'))
-- get past quarter data (3600 seconds)
logtime = os.time() - 15 * 60

-- list of objects by id
objects = {}

-- objects with logging enabled
query = 'SELECT address, datatype, name FROM objects WHERE disablelog=0'
for _, object in ipairs(db:getall(query)) do
  objects[ tonumber(object.address) ] = {
    datatype = tonumber(object.datatype),
    name = tostring(object.name or ''),
  }
end

-- csv buffer
buffer = { '"date","address","name","value"' }

-- get object logs
query = 'SELECT src, address, datahex, logtime, eventtype FROM objectlog WHERE logtime >= ? ORDER BY id DESC'
for _, row in ipairs(db:getall(query, logtime)) do
  object = objects[ tonumber(row.address) ]

  -- found matching object and event type is group write
  if object and row.eventtype == 'write' then
    datatype = object.datatype

    -- check that object datatype is set
    if datatype then
      -- decode data
      data = knxdatatype.decode(row.datahex, datatype)

      -- remove null chars from char/string datatype
      if datatype == dt.char or datatype == dt.string then
        data = data:gsub('%z+', '')
      -- date to DD.MM.YYYY
      elseif datatype == dt.date then
        data = string.format('%.2d.%.2d.%.2d', data.day, data.month, data.year)
      -- time to HH:MM:SS
      elseif datatype == dt.time then
        data = string.format('%.2d:%.2d:%.2d', data.hour, data.minute, data.second)
      end
    else
      data = ''
    end

    -- format csv row
    logdate = os.date('%Y.%m.%d %H:%M:%S', row.logtime)
    csv = string.format('%q,%q,%q,%q', logdate, knxlib.decodega(row.address), object.name, tostring(data))

    -- add to buffer
    table.insert(buffer, csv)
  end
end

-- upload to ftp only when there's data in buffer
--if #buffer > 1 then
--  result, err = socket.ftp.put(ftpfile, table.concat(buffer, '\r\n'))
--end

-- error while uploading
--if err then
--  alert('FTP upload error: %s', tostring(err))
if #buffer > 1 then
  data = table.concat(buffer, '\r\n')
  io.writefile(ftpfile, data)
end

Answer 1

我发现了问题：现在可以了感谢帮助的人！ ：D

if #buffer > 1 then
  --We maken de data compatibel om als string te writen in ons doc.
    data = table.concat(buffer, '\r\n')
  --Connectie leggen met het document , de "ab" wil zeggen dat er append zal worden gebruikt en geen overschrijving
    local file = io.open(ftpfile, "ab")
  --Schrijf de data naar het opgegeven pad
    io.writefile(ftpfile, data)
  --connectie stilleggen.
    io.close(file)
    file = nil
end

Answer 2

if #buffer > 1 then
    data = table.concat(buffer, '\r\n')
    local file = io.open(ftpfile, "ab")
    file:write(data)
    io.close(file)
    file = nil
end

writefile没有附加选项，因此您需要以附加模式打开文件的连接，对其进行写入，然后如上所示关闭该连接。